OPA344NA/250 - Texas Instruments

LOW POWER, SINGLE-SUPPLY, RAIL-TO-RAIL

OPERATIONAL AMPLIFIERS

MicroAmplifier

™ Series

FEATURES

●RAIL-TO-RAIL INPUT

●RAIL-TO-RAIL OUTPUT (within 1mV)

●LOW QUIESCENT CURRENT: 150µA typ

●

Micro

SIZE PACKAGES

SOT23-5

MSOP-8

TSSOP-14

●GAIN-BANDWIDTH

OPA344: 1MHz, G ≥ 1

OPA345: 3MHz, G ≥ 5

●SLEW RATE

OPA344: 0.8V/µs

OPA345: 2V/µs

●THD + NOISE: 0.006%

APPLICATIONS

● PCMCIA CARDS

● DATA ACQUISITION

● PROCESS CONTROL

● AUDIO PROCESSING

●COMMUNICATIONS

●ACTIVE FILTERS

●TEST EQUIPMENT

DESCRIPTION

The OPA344 and OPA345 series rail-to-rail CMOS

operational amplifiers are designed for precision, low-power,

miniature applications. The OPA344 is unity gain stable,

while the OPA345 is optimized for gains greater than or equal

to five, and has a gain-bandwidth product of 3MHz.

The OPA344 and OPA345 are optimized to operate on a

single supply from 2.5V and up to 5.5V with an input

common-mode voltage range that extends 300mV

beyond the supplies. Quiescent current is only

250µA (max).

Rail-to-rail input and output make them ideal for driving

sampling analog-to-digital converters. They are also well suited

for general purpose and audio applications and providing I/V

conversion at the output of D/A converters. Single, dual and

quad versions have identical specs for design flexibility.

A variety of packages are available. All are specified for

operation from –40ºC to 85ºC. A SPICE macromodel for

design analysis is available for download from www.ti.com.

OPA345

OPA2345

OPA4345

OPA344

OPA2344

OPA4344

V+

–In

Out

V–

+In

OPA344, OPA345

SOT23-5

V+

Out

–In

+In

V–

OPA344, OPA345

SO-8, 8-Pin DIP (OPA344 Only)

V+

Out B

–In B

+In B

Out A

–In A

+In A

V–

OPA2344, OPA2345

SO-8, MSOP-8, 8-Pin DIP (OPA2344 Only)

Out D

–In D

+In D

–V

+In C

–In C

Out C

Out A

–In A

+In A

+In B

–In B

Out B

OPA4344, OPA4345

TSSOP-14, SO-14, 14-PIn DIP (OPA4344 Only)

OPA342

OPA4344

OPA344

OPA345

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PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

SBOS107A – APRIL 2000 – REVISED AUGUST 2008

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OPA344, 2344, 4344

OPA345, 2345, 4345

SBOS107A

SPECIFICATIONS: VS = 2.7V to 5.5V

At TA = +25°C, RL = 10kΩ connected to VS/ 2 and VOUT = VS/ 2, unless otherwise noted.

Boldface limits apply over the temperature range, TA = –40°C to +85°C.

OPA344NA, UA, PA

OPA2344EA, UA, PA

OPA4344EA, UA, PA

PARAMETER CONDITION MIN TYP MAX UNITS

OFFSET VOLTAGE

Input Offset Voltage VOS VS = +5.5V, VCM = VS/2 ±0.2 ±1mV

Over Temperature ±0.8 ±1.2 mV

vs Temperature dVOS/dT ±3µV/°C

vs Power Supply PSRR VS = 2.7V to 5.5V, VCM < (V+) -1.8V 30 200 µV/V

Over Temperature VS = 2.7V to 5.5V, VCM < (V+) -1.8V 250 µV/V

Channel Separation, dc 0.2 µV/V

f = 1kHz 130 dB

INPUT BIAS CURRENT

Input Bias Current IB±0.2 ±10 pA

Over Temperature See Typical Curve pA

Input Offset Current IOS ±0.2 ±10 pA

NOISE

Input Voltage Noise f = 0.1 to 50kHz 8 µVrms

Input Voltage Noise Density enf = 10kHz 30 nV/√Hz

Current Noise Density inf = 10kHz 0.5 fA/√Hz

INPUT VOLTAGE RANGE

Common-Mode Voltage Range VCM –0.3 (V+) + 0.3 V

Common-Mode Rejection Ratio CMRR VS = +5.5V, –0.3V < VCM < (V+)-1.8 76 92 dB

Over Temperature VS = +5.5V, –0.3V < VCM < (V+)-1.8 74 dB

Common-Mode Rejection CMRR VS = +5.5V, –0.3V < VCM < 5.8V 70 84 dB

Over Temperature VS = +5.5V, –0.3V < VCM < 5.8V 68 dB

Common-Mode Rejection CMRR VS = +2.7V, –0.3V < VCM < 3V 66 80 dB

Over Temperature VS = +2.7V, –0.3V < VCM < 3V 64 dB

INPUT IMPEDANCE

Differential 1013 || 3 Ω || pF

Common-Mode 1013 || 6 Ω || pF

OPEN-LOOP GAIN

Open-Loop Voltage Gain AOL RL = 100kΩ, 10mV < VO < (V+) –10mV 104 122 dB

Over Temperature RL = 100kΩ, 10mV < VO < (V+) –10mV 100 dB

RL = 5kΩ, 400mV < VO < (V+) –400mV 96 120 dB

Over Temperature RL = 5kΩ, 400mV < VO < (V+) –400mV 90 dB

FREQUENCY RESPONSE CL = 100pF

Gain-Bandwidth Product GBW 1 MHz

Slew Rate SR 0.8 V/µs

Settling Time, 0.1% VS = 5.5V, 2V Step 5 µs

0.01% VS = 5.5V, 2V Step 8 µs

Overload Recovery Time VIN • G = VS2.5 µs

Total Harmonic Distortion + Noise THD+N VS = 5.5V, VO = 3Vp-p, G = 1, f = 1kHz 0.006 %

OUTPUT

Voltage Output Swing from Rail(1) RL = 100kΩ, AOL ≥ 96dB 1 mV

RL = 100kΩ, AOL ≥ 104dB 3 10 mV

Over Temperature RL = 100kΩ, AOL ≥ 100dB 10 mV

RL = 5kΩ, AOL ≥ 96dB 40 400 mV

Over Temperature RL = 5kΩ, AOL ≥ 90dB 400 mV

Short-Circuit Current ISC ±15 mA

Capacitive Load Drive CLOAD See Typical Curve

POWER SUPPLY

Specified Voltage Range VS2.7 5.5 V

Operating Voltage Range 2.5 to 5.5 V

Quiescent Current (per amplifier) IQVS = 5.5V, IO = 0 150 250 µA

Over Temperature 300 µA

TEMPERATURE RANGE

Specified Range –40 85 °C

Operating Range –55 125 °C

Storage Range –65 150 °C

Thermal Resistance

SOT23-5 Surface Mount 200 °C/W

MSOP-8 Surface Mount 150 °C/W

8-Pin DIP 100 °C/W

SO-8 Surface Mount 150 °C/W

TSSOP-14 Surface Mount 100 °C/W

14-Pin DIP 80 °C/W

SO-14 Surface Mount 100 °C/W

NOTE: (1) Output voltage swings are measured between the output and power-supply rails.

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SBOS107A

OPA344, 2344, 4344

OPA345, 2345, 4345 3

SPECIFICATIONS: VS = 2.7V to 5.5V

At TA = +25°C, RL = 10kΩ connected to VS/ 2 and VOUT = VS/ 2, unless otherwise noted.

Boldface limits apply over the temperature range, TA = –40°C to +85°C.

OPA345NA, UA

OPA2345EA, UA

OPA4345EA, UA

PARAMETER CONDITION MIN TYP MAX UNITS

OFFSET VOLTAGE

Input Offset Voltage VOS VS = +5.5V, VCM = VS/2 ±0.2 ±1mV

Over Temperature ±0.8 ±1.2 mV

vs Temperature dVOS/dT ±3µV/°C

vs Power Supply PSRR VS = 2.7V to 5.5V, VCM < (V+) -1.8V 30 200 µV/V

Over Temperature VS = 2.7V to 5.5V, VCM < (V+) -1.8V 250 µV/V

Channel Separation, dc 0.2 µV/V

f = 1kHz 130 dB

INPUT BIAS CURRENT

Input Bias Current IB±0.2 ±10 pA

Over Temperature See Typical Curve pA

Input Offset Current IOS ±0.2 ±10 pA

NOISE

Input Voltage Noise f = 0.1 to 50kHz 8 µVrms

Input Voltage Noise Density enf = 10kHz 30 nV/√Hz

Current Noise Density inf = 10kHz 0.5 fA/√Hz

INPUT VOLTAGE RANGE

Common-Mode Voltage Range VCM –0.3 (V+) + 0.3 V

Common-Mode Rejection Ratio CMRR VS = +5.5V, –0.3V < VCM < (V+)-1.8 76 92 dB

Over Temperature VS = +5.5V, –0.3V < VCM < (V+)-1.8 74 dB

Common-Mode Rejection Ratio CMRR VS = +5.5V, –0.3V < VCM < 5.8V 70 84 dB

Over Temperature VS = +5.5V, –0.3V < VCM < 5.8V 68 dB

Common-Mode Rejection Ratio CMRR VS = +2.7V, –0.3V < VCM < 3V 66 80 dB

Over Temperature VS = +2.7V, –0.3V < VCM < 3V 64 dB

INPUT IMPEDANCE

Differential 1013 || 3 Ω || pF

Common-Mode 1013 || 6 Ω || pF

OPEN-LOOP GAIN

Open-Loop Voltage Gain AOL RL = 100kΩ, 10mV < VO < (V+) –10mV 104 122 dB

Over Temperature RL = 100kΩ, 10mV < VO < (V+) –10mV 100 dB

RL = 5kΩ, 400mV < VO < (V+) –400mV 96 120 dB

Over Temperature RL = 5kΩ, 400mV < VO < (V+) –400mV 90 dB

FREQUENCY RESPONSE CL = 100pF

Gain-Bandwidth Product GBW 3 MHz

Slew Rate SR 2 V/µs

Settling Time, 0.1% G = 5, 2V Output Step 1.5 µs

0.01% G = 5, 2V Output Step 1.6 µs

Overload Recovery Time VIN • G = VS2.5 µs

Total Harmonic Distortion + Noise THD+N VS = 5.5V, VO = 2.5Vp-p, G = 5, f = 1kHz 0.006 %

OUTPUT

Voltage Output Swing from Rail(1) RL = 100kΩ, AOL ≥ 96dB 1 mV

RL = 100kΩ, AOL ≥ 104dB 3 10 mV

Over Temperature RL = 100kΩ, AOL ≥ 100dB 10 mV

RL = 5kΩ, AOL ≥ 96dB 40 400 mV

Over Temperature RL = 5kΩ, AOL ≥ 90dB 400 mV

Short-Circuit Current ISC ±15 mA

Capacitive Load Drive CLOAD See Typical Curve

POWER SUPPLY

Specified Voltage Range VS2.7 5.5 V

Operating Voltage Range 2.5 to 5.5 V

Quiescent Current (per amplifier) IQVS = 5.5V, IO = 0 150 250 µA

Over Temperature 300 µA

TEMPERATURE RANGE

Specified Range –40 85 °C

Operating Range –55 125 °C

Storage Range –65 150 °C

Thermal Resistance

SOT23-5 Surface Mount 200 °C/W

MSOP-8 Surface Mount 150 °C/W

SO-8 Surface Mount 150 °C/W

TSSOP-14 Surface Mount 100 °C/W

SO-14 Surface Mount 100 °C/W

NOTE: (1) Output voltage swings are measured between the output and power-supply rails.

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OPA344, 2344, 4344

OPA345, 2345, 4345

SBOS107A

SPECIFIED

PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE DESIGNATOR RANGE MARKING NUMBER(2) MEDIA

OPA344NA SOT23-5 DBV –40°C to +85°C B44 OPA344NA /250 Tape and Reel

"""""OPA344NA /3K Tape and Reel

OPA344UA SO-8 D –40°C to +85°C OPA344UA OPA344UA Rails

"""""OPA344UA/2K5 Tape and Reel

OPA344PA 8-Pin Dip P –40° C to +85°C OPA344PA OPA344PA Rails

OPA2344EA MSOP-8 DGK –40°C to +85°C C44 OPA2344EA/250 Tape and Reel

"""""OPA2344EA /2K5 Tape and Reel

OPA2344UA SO-8 D –40°C to +85°C OPA2344UA OPA2344UA Rails

"""""OPA2344UA /2K5 Tape and Reel

OPA2344PA 8-Pin DIP P –40°C to +85°C OPA2344PA OPA2344PA Rails

OPA4344EA TSSOP-14 PW –40°C to +85°C OPA4344EA OPA4344EA/250 Rails

"""""OPA4344EA /2K5 Tape and Reel

OPA4344UA SO-14 D –40°C to +85°C OPA4344UA OPA4344UA Rails

"""""OPA4344UA /2K5 Tape and Reel

OPA4344PA 14-Pin DIP N –40°C to +85°C OPA4344PA OPA4344PA Rails

OPA345NA SOT23-5 DBV –40°C to +85°C A45 OPA345NA/250 Tape and Reel

" " " " " OPA345NA/3K Tape and Reel

OPA345UA SO-8 D –40°C to +85°C OPA345UA OPA345UA Rails

" " " " " OPA345UA/2K5 Tape and Reel

OPA2345EA MSOP-8 DGK –40°C to +85°C B45 OPA2345EA/250 Tape and Reel

"""""OPA2345EA /2K5 Tape and Reel

OPA2345UA SO-8 D –40°C to +85°C OPA2345UA OPA2345UA Rails

"""""OPA2345UA /2K5 Tape and Reel

OPA4345EA TSSOP-14 PW –40°C to +85°C OPA4345EA OPA4345EA/250 Tape and Reel

"""""OPA4345EA /2K5 Tape and Reel

OPA4345UA SO-14 D –40°C to +85°C OPA4345UA OPA4345UA Rails

"""""OPA4345UA /2K5 Tape and Reel

NOTES: (1)For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site

at www.ti.com.

(2)Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500

pieces of “OPA344UA/2K5” will get a single 2500-piece Tape and Reel.

PACKAGE/ORDERING INFORMATION(1)

Supply Voltage, V+ to V- ................................................................... 7.5V

Signal Input Terminals, Voltage(2) .....................(V–) –0.5V to (V+) +0.5V

Current(2) .................................................... 10mA

Output Short-Circuit(3) .............................................................. Continuous

Operating Temperature ..................................................–55°C to +125°C

Storage Temperature .....................................................–65°C to +150°C

Junction Temperature...................................................................... 150°C

Lead Temperature (soldering, 10s)................................................. 300°C

ESD Tolerance (Human Body Model) ............................................ 4000V

NOTES: (1) Stresses above these ratings may cause permanent damage.

Exposure to absolute maximum conditions for extended periods may

degrade device reliability. These are stress ratings only. Functional opera-

tion of the device at these conditions, or beyond the specified operating

conditions, is not implied. (2) Input terminals are diode-clamped to the power

supply rails. Input signals that can swing more than 0.5V beyond the supply

rails should be current-limited to 10mA or less. (3) Short-circuit to ground,

one amplifier per package.

ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC

DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas

Instruments recommends that all integrated circuits be handled

with appropriate precautions. Failure to observe proper han-

dling and installation procedures can cause damage.

ESD damage can range from subtle performance degrada-

tion to complete device failure. Precision integrated circuits

may be more susceptible to damage because very small

parametric changes could cause the device not to meet its

published specifications.

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SBOS107A

OPA344, 2344, 4344

OPA345, 2345, 4345 5

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

POWER SUPPLY AND COMMON-MODE

REJECTION RATIO vs FREQUENCY

Rejection Ratio (dB)

Frequency (Hz)

100 1k 10k 100k

100

+PSRR

CMRR

–PSRR

MAXIMUM OUTPUT VOLTAGE vs FREQUENCY

10k 100k

Maximum Output Voltage (V

)

Frequency (Hz) 1M 10M

OPA344

= +5.5V

= +5V

= +2.7V

OPA345

CHANNEL SEPARATION vs FREQUENCY

100

Channel Separation (dB)

Frequency (Hz)

1k 10k 100k 1M

140

120

100

Dual and quad devices.

G = 1, all channels.

Quad measured channel

A to D or B to C—other

combinations yield improved

rejection.

VOLTAGE AND CURRENT NOISE

SPECTRAL DENSITY vs FREQUENCY

Voltage Noise (nV/√Hz)

Frequency (Hz)

10 100 1k 10k 100k 1M 10M

10000

1000

100

Current Noise (fA/√Hz)

100

0.1

OPEN-LOOP GAIN/PHASE vs FREQUENCY

0.1 1

Gain (dB)

120

150

180

Phase (°)

Frequency (Hz)

10 100 1k 10k 100k 1M 10M

120

100

Gain

Phase

OPA345

OPEN-LOOP GAIN/PHASE vs FREQUENCY

0.1 1

Gain (dB)

120

150

180

Phase (°)

Frequency (Hz)

10 100 1k 10k 100k 1M 10M

120

100

Gain

Phase

OPA344

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OPA344, 2344, 4344

OPA345, 2345, 4345

SBOS107A

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

TOTAL HARMONIC DISTORTION + NOISE

vs FREQUENCY

THD+N (%)

Frequency (Hz)

100 1k 10k 20k

0.1

0.010

0.001

OPA344: G = 1

OPA345: G = 5

OPEN-LOOP GAIN, COMMON-MODE REJECTION RATIO,

AND POWER-SUPPLY REJECTION vs TEMPERATURE

–75

, CMRR, PSRR (dB)

Temperature (°C)

–25 0 25–50 50 12575 100

140

120

100

CMRR

PSRR

INPUT BIAS CURRENT vs TEMPERATURE

–75

Input Bias Current (pA)

Temperature (°C)

–25 0 25–50 10050 75 125

10000

1000

100

0.1

QUIESCENT CURRENT AND

SHORT-CIRCUIT CURRENT vs TEMPERATURE

–75 –50 0

Quiescent Current (µA)

Temperature (°C)

25 50 100

+ISC

–ISC

75–25 125

200

175

150

135

100

Short-Circuit Current (mA)

SLEW RATE vs TEMPERATURE

–75

Slew Rate (V/µs)

Temperature (°C)

250

SR–

SR+

7550–25–50 125100

3.0

2.5

2.0

1.5

1.0

0.5

OPA345

OPA344

INPUT BIAS CURRENT

vs COMMON-MODE VOLTAGE

–1

Input Bias Current (pA)

Common-Mode Voltage (V)

012 4356

–2

–4

–6

V+

Supply

V–

Supply

Input voltage ≤ –0.3V

can cause op amp output

to lock up. See text.

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SBOS107A

OPA344, 2344, 4344

OPA345, 2345, 4345 7

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

QUIESCENT CURRENT AND

SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE

Quiescent Current (µA)

Supply Voltage (V)

23456

–I

160

155

150

145

140

Short-Circuit Current (mA)

OPEN-LOOP GAIN vs OUTPUT VOLTAGE SWING

140

130

120

110

100

Open-Loop Gain (dB)

Output Voltage Swing from Rail (mV)

120 100 80 60 40 20 0

= 5kΩ

= 100kΩ

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT

Output Voltage (V)

Output Current (mA)

≈≈

10 15 20

V+

(V+) – 1

(V+) – 2

85°C

25°C

–40°C

85°C

25°C

–40°C

QUIESCENT CURRENT

PRODUCTION DISTRIBUTION

Population

Quiescent Current (µA)

100

115

130

145

160

175

190

205

220

235

250

OFFSET VOLTAGE

PRODUCTION DISTRIBUTION

Population

Offset Voltage (µV)

–1000

–800

–600

–400

–200

200

400

600

800

1000

OFFSET VOLTAGE DRIFT

PRODUCTION DISTRIBUTION

Population

Offset Voltage Drift (µV/°C)

–10

–8

–6

–4

–2

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OPA344, 2344, 4344

OPA345, 2345, 4345

SBOS107A

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

Small-Signal Overshoot (%)

SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE

100 1k 10k10 Load Capacitance (pF)

G = –5

G = –10, +10

G = +5

OPA345

20mV/div

5µs/div

SMALL-SIGNAL STEP RESPONSE: OPA345

G = +5, RL = 10kΩ, CL = 100pF

OPA345

20mV/div

5µs/div

SMALL-SIGNAL STEP RESPONSE: OPA344

G = +1, RL = 10kΩ, CL = 100pF

OPA344

5µs/div

LARGE-SIGNAL STEP RESPONSE: OPA344

G = +1, RL = 10kΩ, CL = 100pF

1V/div

OPA344

5µs/div

LARGE-SIGNAL STEP RESPONSE: OPA345

G = +5, RL = 10kΩ, CL = 100pF

1V/div

OPA345

SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE

Small-Signal Overshoot (%)

Load Capacitance (pF)

10 100 1k 10k

G = –1

G = –5

OPA344

G = +5

G = +1

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SBOS107A

OPA344, 2344, 4344

OPA345, 2345, 4345 9

APPLICATIONS INFORMATION

OPA344 series op amps are unity gain stable and can operate

on a single supply, making them highly versatile and easy to

use. OPA345 series op amps are optimized for applications

requiring higher speeds with gains of 5 or greater.

Rail-to-rail input and output swing significantly increases

dynamic range, especially in low supply applications. Figure

1 shows the input and output waveforms for the OPA344 in

unity-gain configuration. Operation is from VS = +5V with

a 10kΩ load connected to VS/2. The input is a 5Vp-p

sinusoid. Output voltage is approximately 4.997Vp-p.

Power supply pins should be bypassed with 0.01µF ceramic

capacitors.

OPERATING VOLTAGE

OPA344 and OPA345 series op amps are fully specified and

ensured from +2.7V to +5.5V. In addition, many specifica-

tions apply from –40ºC to +85ºC. Parameters that vary

significantly with operating voltages or temperature are

shown in the Typical Performance Curves.

RAIL-TO-RAIL INPUT

The input common-mode voltage range of the OPA344 and

OPA345 series extends 300mV beyond the supply rails.

This is achieved with a complementary input stage—an N-

channel input differential pair in parallel with a P-channel

differential pair (see Figure 2). The N-channel pair is active

for input voltages close to the positive rail, typically (V+) –

1.3V to 300mV above the positive supply, while the P-

channel pair is on for inputs from 300mV below the negative

supply to approximately (V+) –1.3V. There is a small

transition region, typically (V+) – 1.5V to (V+) – 1.1V, in

which both pairs are on. This 400mV transition region can

vary 300mV with process variation. Thus, the transition

region (both stages on) can range from (V+) – 1.8V to (V+)

– 1.4V on the low end, up to (V+) – 1.2V to (V+) – 0.8V on

the high end. Within the 400mV transition region PSRR,

CMRR, offset voltage, offset drift, and THD may be de-

graded compared to operation outside this region. For more

information on designing with rail-to-rail input op amps, see

Figure 3 “Design Optimization with Rail-to-Rail Input Op

Amps.”

FIGURE 2. Simplified Schematic.

BIAS1

BIAS2

–

Class AB

Control

Circuitry V

V–

(Ground)

V+

Reference

Current

FIGURE 1. Rail-to-Rail Input and Output.

5µs/div

1V/div

Output (inverted on scope)

Input G = +1, VS = +5V

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OPA344, 2344, 4344

OPA345, 2345, 4345

SBOS107A

COMMON-MODE REJECTION

The CMRR for the OPA344 and OPA345 is specified in

several ways so the best match for a given application may

be used. First, the CMRR of the device in the common-mode

range below the transition region (VCM < (V+) – 1.8V) is

given. This specification is the best indicator of the capabil-

ity of the device when the application requires use of one of

the differential input pairs. Second, the CMRR at VS = 5.5V

over the entire common-mode range is specified. Third, the

CMRR at VS = 2.7V over the entire common-mode range is

provided. These last two values include the variations seen

through the transition region.

INPUT VOLTAGE BEYOND THE RAILS

If the input voltage can go more than 0.3V below the

negative power supply rail (single-supply ground), special

precautions are required. If the input voltage goes suffi-

ciently negative, the op amp output may lock up in an

inoperative state. A Schottky diode clamp circuit will pre-

vent this—see Figure 4. The series resistor prevents exces-

sive current (greater than 10mA) in the Schottky diode and

in the internal ESD protection diode, if the input voltage can

exceed the positive supply voltage. If the signal source is

limited to less than 10mA, the input resistor is not required.

RAIL-TO-RAIL OUTPUT

A class AB output stage with common-source transistors is

used to achieve rail-to-rail output. This output stage is

capable of driving 600Ω loads connected to any potential

between V+ and ground. For light resistive loads (> 50kΩ),

the output voltage can typically swing to within 1mV from

supply rail. With moderate resistive loads (2kΩ to 50kΩ),

the output can swing to within a few tens of millivolts from

the supply rails while maintaining high open-loop gain. See

the typical performance curve “Output Voltage Swing vs

Output Current.”

VIN

VBV+

Non-Inverting Gain

VCM = VIN

VIN V+

Inverting Amplifier

VCM = VB

VIN

V+

G = 1 Buffer

VCM = VIN = VO

FIGURE 3. Design Optimization with Rail-to-Rail Input Op Amps.

Rail-to-rail op amps can be used in virtually any op amp

configuration. To achieve optimum performance, how-

ever, applications using these special double-input-stage

op amps may benefit from consideration of their special

behavior.

In many applications, operation remains within the com-

mon-mode range of only one differential input pair.

However some applications exercise the amplifier through

the transition region of both differential input stages.

Although the two input stages are laser trimmed for

excellent matching, a small discontinuity may occur in

this transition. Careful selection of the circuit configura-

tion, signal levels and biasing can often avoid this transi-

tion region.

DESIGN OPTIMIZATION WITH RAIL-TO-RAIL INPUT OP AMPS

With a unity-gain buffer, for example, signals will traverse

this transition at approximately 1.3V below V+ supply

and may exhibit a small discontinuity at this point.

The common-mode voltage of the non-inverting ampli-

fier is equal to the input voltage. If the input signal always

remains less than the transition voltage, no discontinuity

will be created. The closed-loop gain of this configura-

tion can still produce a rail-to-rail output.

Inverting amplifiers have a constant common-mode volt-

age equal to VB. If this bias voltage is constant, no

discontinuity will be created. The bias voltage can gener-

ally be chosen to avoid the transition region.

FIGURE 4. Input Current Protection for Voltages Exceed-

ing the Supply Voltage.

1kΩ

OPA344

10mA max

V+

OUT

OVERLOAD

IN5818

Schottky diode is required only

if input voltage can go more

than 0.3V below ground.

CAPACITIVE LOAD AND STABILITY

The OPA344 in a unity-gain configuration and the OPA345

in gains greater than 5 can directly drive up to 250pF pure

capacitive load. Increasing the gain enhances the amplifier’s

ability to drive greater capacitive loads. See the typical

www.ti.com

SBOS107A

OPA344, 2344, 4344

OPA345, 2345, 4345 11

performance curve “Small-Signal Overshoot vs Capacitive

Load.” In unity-gain configurations, capacitive load drive

can be improved by inserting a small (10Ω to 20Ω) resistor,

RS, in series with the output, as shown in Figure 5. This

significantly reduces ringing while maintaining dc perfor-

mance for purely capacitive loads. However, if there is a

resistive load in parallel with the capacitive load, a voltage

divider is created, introducing a dc error at the output and

slightly reducing the output swing. The error introduced is

proportional to the ratio RS/RL, and is generally negligible.

FIGURE 6. OPA344 in Noninverting Configuration Driving ADS7822.

FIGURE 7. Speech Bandpass Filtered Data Acquisition System.

DRIVING A/D CONVERTERS

The OPA344 and OPA345 series op amps are optimized for

driving medium-speed sampling A/D converters. The

OPA344 and OPA345 op amps buffer the A/D’s input

capacitance and resulting charge injection while providing

signal gain.

Figures 6 shows the OPA344 in a basic noninverting con-

figuration driving the ADS7822. The ADS7822 is a 12-bit,

micro-power sampling converter in the MSOP-8 package.

When used with the low-power, miniature packages of the

OPA344, the combination is ideal for space-limited, low-

power applications. In this configuration, an RC network at

the A/D’s input can be used to filter charge injection.

Figure 7 shows the OPA2344 driving an ADS7822 in a

speech bandpass filtered data acquisition system. This small,

low-cost solution provides the necessary amplification and

signal conditioning to interface directly with an electret

microphone. This circuit will operate with VS = +2.7V to

+5V with less than 500µA quiescent current.

FIGURE 5. Series Resistor in Unity-Gain Configuration

Improves Capacitive Load Drive.

10Ω to

20Ω

OPA344

V+

OUT

33pF

V+

GND

–IN

+IN

DCLOCK

Serial

Interface

1000pF

1.5kΩR

20kΩ

100kΩ

150kΩ

510kΩ

51kΩ

OUT

REF

V+ = +2.7V to 5V

CS/SHDN

1000pF

Electret

Microphone

(1)

G = 100

Passband 300Hz to 3kHz

1MΩ

NOTE: (1) Electret microphone

ADS7822

12-Bit A/D

1/2

OPA2344 1/2

OPA2344

ADS7822

12-Bit A/D

DCLOCK

DOUT

CS/SHDN

OPA344

+5V

VIN

V+

+In

–In

VREF

4GND

Serial

Interface

0.1µF 0.1µF

NOTE: A/D Input = 0 to VREF

VIN = 0V to 5V for

0V to 5V output.

RC network filters high frequency noise.

500Ω

3300pF

PACKAGE OPTION ADDENDUM

www.ti.com 16-Aug-2012

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status (1) Package Type Package

Drawing Pins Package Qty Eco Plan (2) Lead/

Ball Finish MSL Peak Temp (3) Samples

(Requires Login)

OPA2344EA/250 ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

OPA2344EA/250G4 ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

OPA2344EA/2K5 ACTIVE VSSOP DGK 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

OPA2344EA/2K5G4 ACTIVE VSSOP DGK 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

OPA2344PA ACTIVE PDIP P 8 50 Green (RoHS

& no Sb/Br) CU NIPDAU N / A for Pkg Type

OPA2344PAG4 ACTIVE PDIP P 8 50 Green (RoHS

& no Sb/Br) CU NIPDAU N / A for Pkg Type

OPA2344UA ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA2344UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA2344UA/2K5G4 ACTIVE SOIC D 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA2344UAG4 ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA2345EA/250 ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

OPA2345EA/250G4 ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

OPA2345UA ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA2345UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA2345UA/2K5G4 ACTIVE SOIC D 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA2345UAG4 ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA344NA/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

PACKAGE OPTION ADDENDUM

www.ti.com 16-Aug-2012

Addendum-Page 2

Orderable Device Status (1) Package Type Package

Drawing Pins Package Qty Eco Plan (2) Lead/

Ball Finish MSL Peak Temp (3) Samples

(Requires Login)

OPA344NA/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA344NA/3K ACTIVE SOT-23 DBV 5 3000 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA344NA/3KG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA344PA ACTIVE PDIP P 8 50 Green (RoHS

& no Sb/Br) CU NIPDAU N / A for Pkg Type

OPA344PAG4 ACTIVE PDIP P 8 50 Green (RoHS

& no Sb/Br) CU NIPDAU N / A for Pkg Type

OPA344UA ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA344UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA344UA/2K5G4 ACTIVE SOIC D 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA344UAG4 ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA345NA/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA345NA/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA345UA ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA345UAG4 ACTIVE SOIC D 8 75 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4344EA/250 ACTIVE TSSOP PW 14 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

OPA4344EA/250G4 ACTIVE TSSOP PW 14 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

OPA4344EA/2K5 ACTIVE TSSOP PW 14 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

OPA4344EA/2K5G4 ACTIVE TSSOP PW 14 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM

OPA4344PA ACTIVE PDIP N 14 25 Green (RoHS

& no Sb/Br) CU NIPDAU N / A for Pkg Type

PACKAGE OPTION ADDENDUM

www.ti.com 16-Aug-2012

Addendum-Page 3

Orderable Device Status (1) Package Type Package

Drawing Pins Package Qty Eco Plan (2) Lead/

Ball Finish MSL Peak Temp (3) Samples

(Requires Login)

OPA4344PAG4 ACTIVE PDIP N 14 25 Green (RoHS

& no Sb/Br) CU NIPDAU N / A for Pkg Type

OPA4344UA ACTIVE SOIC D 14 50 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4344UA/2K5 ACTIVE SOIC D 14 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4344UA/2K5G4 ACTIVE SOIC D 14 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4344UAG4 ACTIVE SOIC D 14 50 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4345EA/250 ACTIVE TSSOP PW 14 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4345EA/250G4 ACTIVE TSSOP PW 14 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4345UA ACTIVE SOIC D 14 50 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

OPA4345UAG4 ACTIVE SOIC D 14 50 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

PACKAGE OPTION ADDENDUM

www.ti.com 16-Aug-2012

Addendum-Page 4

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

OPA2344EA/250 VSSOP DGK 8 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

OPA2344EA/2K5 VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

OPA2344UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

OPA2345EA/250 VSSOP DGK 8 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

OPA2345UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

OPA344NA/250 SOT-23 DBV 5 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3

OPA344NA/3K SOT-23 DBV 5 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3

OPA344UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

OPA345NA/250 SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3

OPA4344EA/250 TSSOP PW 14 250 180.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1

OPA4344EA/2K5 TSSOP PW 14 2500 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1

OPA4344UA/2K5 SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1

OPA4345EA/250 TSSOP PW 14 250 180.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 16-Aug-2012

Pack Materials-Page 1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

OPA2344EA/250 VSSOP DGK 8 250 210.0 185.0 35.0

OPA2344EA/2K5 VSSOP DGK 8 2500 367.0 367.0 35.0

OPA2344UA/2K5 SOIC D 8 2500 367.0 367.0 35.0

OPA2345EA/250 VSSOP DGK 8 250 210.0 185.0 35.0

OPA2345UA/2K5 SOIC D 8 2500 367.0 367.0 35.0

OPA344NA/250 SOT-23 DBV 5 250 210.0 185.0 35.0

OPA344NA/3K SOT-23 DBV 5 3000 210.0 185.0 35.0

OPA344UA/2K5 SOIC D 8 2500 367.0 367.0 35.0

OPA345NA/250 SOT-23 DBV 5 250 180.0 180.0 18.0

OPA4344EA/250 TSSOP PW 14 250 210.0 185.0 35.0

OPA4344EA/2K5 TSSOP PW 14 2500 367.0 367.0 35.0

OPA4344UA/2K5 SOIC D 14 2500 367.0 367.0 38.0

OPA4345EA/250 TSSOP PW 14 250 210.0 185.0 35.0

PACKAGE MATERIALS INFORMATION

www.ti.com 16-Aug-2012

Pack Materials-Page 2

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