1
®
OPA340/2340/4340
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Out D
–In D
+In D
–V
+In C
–In C
Out C
NC
Out A
–In A
+In A
+V
+In B
–In B
Out B
NC
OPA4340
SSOP-16
AD
BC
1
2
3
4
8
7
6
5
V+
Out B
–In B
+In B
Out A
–In A
+In A
V–
OPA2340
8-Pin DIP, SO-8, MSOP-8
A
B
1
2
3
4
8
7
6
5
NC
V+
Output
NC
NC
–In
+In
V–
OPA340
8-Pin DIP, SO-8
1
2
3
5
4
V+
–In
Out
V–
+In
OPA340
SOT-23-5
SINGLE-SUPPLY, RAIL-TO-RAIL
OPERATIONAL AMPLIFIERS
Micro
Amplifier
™ Series
FEATURES
●RAIL-TO-RAIL INPUT
●RAIL-TO-RAIL OUTPUT (within 1mV)
●
Micro
SIZE PACKAGES
●WIDE BANDWIDTH: 5.5MHz
●HIGH SLEW RATE: 6V/µs
● LOW THD+NOISE: 0.0007% (f = 1kHz)
●LOW QUIESCENT CURRENT: 750µA/channel
●SINGLE, DUAL, AND QUAD
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
APPLICATIONS
● DRIVING A/D CONVERTERS
● PCMCIA CARDS
● DATA ACQUISITION
● PROCESS CONTROL
● AUDIO PROCESSING
●COMMUNICATIONS
●ACTIVE FILTERS
●TEST EQUIPMENT
DESCRIPTION
OPA340 series rail-to-rail CMOS operational amplifi-
ers are optimized for low voltage, single supply opera-
tion. Rail-to-rail input/output and high speed operation
make them ideal for driving sampling analog-to-digital
converters. They are also well suited for general pur-
pose and audio applications as well as providing I/V
conversion at the output of D/A converters. Single,
dual, and quad versions have identical specifications
for design flexibility.
The OPA340 series operates on a single supply as low as
2.5V with an input common-mode voltage range that
extends 500mV below ground and 500mV above the
positive supply. Output voltage swing is to within 1mV
of the supply rails with a 100kΩ load. They offer excel-
lent dynamic response (BW = 5.5MHz, SR = 6V/µs), yet
quiescent current is only 750µA. Dual and quad designs
feature completely independent circuitry for lowest
crosstalk and freedom from interaction.
The single (OPA340) packages are the tiny 5-lead
SOT-23-5 surface mount, SO-8 surface mount, and
8-pin DIP. The dual (OPA2340) comes in the minia-
ture MSOP-8 surface mount, SO-8 surface mount,
and 8-pin DIP packages. The quad (OPA4340) pack-
ages are the space-saving SSOP-16 surface mount,
SO-14 surface mount, and the 14-pin DIP. All are
specified from –40°C to +85°C and operate from
–55°C to +125°C. A SPICE macromodel is available
for design analysis.
OPA4340
OPA340
OPA2340
OPA4340
®
OPA340
OPA2340
OPA4340
© 1997 Burr-Brown Corporation PDS-1404C Printed in U.S.A. December, 1997
SBOS073
2
®
OPA340/2340/4340
SPECIFICATIONS: VS = 2.7V to 5V
At TA = +25°C, RL = 10kΩ connected to VS/2 and VOUT = VS/2, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. VS = 5V.
PARAMETER CONDITION MIN TYP(1) MAX UNITS
OFFSET VOLTAGE
Input Offset Voltage VOS VS = 5V ±150 ±500 µV
vs Temperature dVOS/dT ±2.5 µV/°C
vs Power Supply PSRR VS = 2.7V to 5.5V, VCM = 0V 30 120 µV/V
TA = –40°C to +85°CVS = 2.7V to 5.5V, VCM = 0V 120 µV/V
Channel Separation, dc 0.2 µV/V
INPUT BIAS CURRENT
Input Bias Current IB±0.2 ±10 pA
TA = –40°C to +85°C±60 pA
Input Offset Current IOS ±0.2 ±10 pA
NOISE
Input Voltage Noise, f = 0.1 to 50kHz 8 µVrms
Input Voltage Noise Density, f = 1kHz en25 nV/√Hz
Current Noise Density, f = 1kHz in3 fA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range VCM –0.3 (V+) +0.3 V
Common-Mode Rejection Ratio CMRR –0.3V < VCM < (V+) –1.8V 80 92 dB
VS = 5V, –0.3V < VCM < 5.3V 70 84 dB
VS = 2.7V, –0.3V < VCM < 3V 66 80 dB
INPUT IMPEDANCE
Differential 1013 || 3 Ω || pF
Common-Mode 1013 || 6 Ω || pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain AOL RL = 100kΩ, 5mV < VO < (V+) –5mV 106 124 dB
TA = –40°C to +85°CRL = 100kΩ, 5mV < VO < (V+) –5mV 106 dB
RL = 10kΩ, 50mV < VO < (V+) –50mV 100 120 dB
TA = –40°C to +85°CRL = 10k Ω, 50mV < VO < (V+) –50mV 100 dB
RL = 2kΩ, 200mV < VO < (V+) –200mV 94 114 dB
TA = –40°C to +85°CRL = 2kΩ, 200mV < VO < (V+) –200mV 94 dB
FREQUENCY RESPONSE
Gain-Bandwidth Product GBW G = 1 5.5 MHz
Slew Rate SR VS = 5V, G = 1, CL = 100pF 6 V/µs
Settling Time, 0.1% VS = 5V, 2V Step, CL = 100pF 1 µs
0.01% VS = 5V, 2V Step, CL = 100pF 1.6 µs
Overload Recovery Time VIN • G = VS0.2 µs
Total Harmonic Distortion + Noise THD+N VS = 5V, VO = 3Vp-p(2), G = 1, f = 1kHz 0.0007 %
OUTPUT
Voltage Output Swing from Rail(3) RL = 100kΩ, AOL ≥ 106dB 1 5 mV
TA = –40°C to +85°CRL = 100kΩ, AOL ≥ 106dB 5mV
RL = 10kΩ, AOL ≥ 100dB 10 50 mV
TA = –40°C to +85°CRL = 10kΩ, AOL ≥ 100dB 50 mV
RL = 2kΩ, AOL ≥ 94dB 40 200 mV
TA = –40°C to +85°CRL = 2kΩ, AOL ≥ 94dB 200 mV
Short-Circuit Current ISC ±50 mA
Capacitive Load Drive CLOAD See Typical Curve
POWER SUPPLY
Specified Voltage Range VS2.7 5 V
Operating Voltage Range 2.5 to 5.5 V
Quiescent Current (per amplifier) IQIO = 0, VS = +5V 750 950 µA
TA = –40°C to +85°CIO = 0, VS = +5V 1100 µA
TEMPERATURE RANGE
Specified Range –40 +85 °C
Operating Range –55 +125 °C
Storage Range –55 +125 °C
Thermal Resistance
θ
JA
SOT-23-5 Surface Mount 200 °C/W
MSOP-8 Surface Mount 150 °C/W
SO-8 Surface Mount 150 °C/W
8-Pin DIP 100 °C/W
SSOP-16 Surface Mount 100 °C/W
SO-14 Surface Mount 100 °C/W
14-Pin DIP 80 °C/W
NOTES: (1) VS = +5V. (2) VOUT = 0.25V to 3.25V. (3) Output voltage swings are measured between the output and power supply rails.
OPA340NA, PA, UA
OPA2340EA, PA, UA
OPA4340EA, PA, UA
3
®
OPA340/2340/4340
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Out D
–In D
+In D
V–
+In C
–In C
Out C
Out A
–In A
+In A
V+
+In B
–In B
Out B
OPA4340
AD
BC
PACKAGE/ORDERING INFORMATION
Supply Voltage ...................................................................................5.5V
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..................................................... –55°C to +125°C
Junction Temperature ...................................................................... 150°C
Lead Temperature (soldering, 10s) ................................................. 300 °C
NOTES: (1) Stresses above these ratings may cause permanent damage.
(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)
PIN CONFIGURATIONS
Top View SOIC/DIP
PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT
PRODUCT PACKAGE NUMBER(1) RANGE MARKING NUMBER(2) MEDIA
Single
OPA340NA 5-Lead SOT-23-5 331 –40°C to +85°C A40 OPA340NA-250 Tape and Reel
"""""OPA340NA-3K Tape and Reel
OPA340PA 8-Pin DIP 006 –40°C to +85°C OPA340PA OPA340PA Rails
OPA340UA SO-8 Surface-Mount 182 –40°C to +85°C OPA340UA OPA340UA Rails(3)
Dual
OPA2340EA MSOP-8 Surface-Mount 337 –40°C to +85°C A40A OPA2340EA-250 Tape and Reel
" " " " " OPA2340EA-2500 Tape and Reel
OPA2340PA 8-Pin DIP 006 –40°C to +85°C OPA2340PA OPA2340PA Rails
OPA2340UA SO-8 Surface-Mount 182 –40°C to +85°C OPA2340UA OPA2340UA Rails(3)
Quad
OPA4340EA SSOP-16 Surface-Mount 322 –40°C to +85°C OPA4340EA OPA4340EA-250 Tape and Reel
" " " " " OPA4340EA-2500 Tape and Reel
OPA4340PA 14-Pin DIP 010 –40°C to +85°C OPA4340PA OPA4340PA Rails
OPA4340UA SO-14 Surface Mount 235 –40°C to +85 °C OPA4340UA OPA4340UA Rails(3)
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with -250, -2500, and
-3K are available only in Tape and Reel in the quantities indicated (e.g., -250 indicates 250 devices per reel). Ordering 3000 pieces of “OPA340NA-3K” will get
a single 3000 piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book. (3) SO-8 and SO-14
models also available in Tape and Reel.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility
for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or
licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support
devices and/or systems.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
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.
4
®
OPA340/2340/4340
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.
CLOSED-LOOP OUTPUT IMPEDANCE
vs FREQUENCY
5k
4k
3k
2k
1k
0
Output Resistance (Ω)
Frequency (Hz)
10 100 1k 10k 100k 1M 10M
G = 100
G = 10
G = 1
CHANNEL SEPARATION vs FREQUENCY
Frequency (Hz)
Channel Separation (dB)
140
130
120
110
100 10010 1k 10k 100k
G = 1, All Channels
OPEN-LOOP GAIN/PHASE vs FREQUENCY
0.1 1
160
140
120
100
80
60
40
20
0
–20
Voltage Gain (dB)
0
–45
–90
–135
–180
Phase (°)
Frequency (Hz)
10 100 1k 10k 100k 1M 10M
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
10k
1k
100
10
1
1k
100
10
1
0.1
Voltage Noise (nV√Hz)
Frequency (Hz)
1 10 100 1k 10k 100k 1M
Current Noise (fA√Hz)
Current Noise
Voltage Noise
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
0.1
0.01
0.001
0.0001
THD+N (%)
Frequency (Hz)
20 100 1k 10k 20k
R
L
= 600
G = 10
G = 1
R
L
= 2k
R
L
= 2k
R
L
= 10k
R
L
= 600
R
L
= 10k
POWER SUPPLY and COMMON-MODE
REJECTION vs FREQUENCY
100
80
60
40
20
0
PSRR, CMRR (dB)
Frequency (Hz)
1 10 100 1k 10k 100k 1M
PSRR
CMRR
5
®
OPA340/2340/4340
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
1000
900
800
700
600
500
Quiescent Current (µA)
Temperature (°C)
–75 –50 –25 0 25 50 75 100 125
Per Amplifier
SHORT-CIRCUIT CURRENT vs TEMPERATURE
Temperature (°C)
Short-Circuit Current (mA)
100
90
80
70
60
50
40
30
20
10
0
–75 –50 –25 0 25 50 75 100 125
–I
SC
+I
SC
SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE
Supply Voltage (V)
Short-Circuit Current (mA)
60
50
40
302.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
+I
SC
–I
SC
COMMON-MODE REJECTION vs TEMPERATURE
100
90
80
70
60
50
40
CMRR (dB)
Temperature (°C)
–75 –50 –25 0 25 50 75 100 125
V
S
= 5V, V
CM
= –0.3V to 5.3V
V
S
= 2.7V, V
CM
= –0.3V to 3V
V
S
= 2.7V to 5V, V
CM
= –0.3V to (V+) –1.8V
QUIESCENT CURRENT vs SUPPLY VOLTAGE
Supply Voltage (V)
Quiescent Current (µA)
800
750
700
650
6002.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Per Amplifier
OPEN-LOOP GAIN AND POWER SUPPLY REJECTION
vs TEMPERATURE
130
120
110
100
90
80
A
OL
, PSRR (dB)
Temperature (°C)
–75 –50 –25 0 25 50 75 100 125
R
L
= 100kΩ
R
L
= 10kΩ
R
L
= 2kΩ
A
OL
PSRR
6
®
OPA340/2340/4340
INPUT BIAS CURRENT vs TEMPERATURE
Input Bias Current (pA)
Temperature (°C)
–75 –50 –25 0 25 50 75 100 125
1k
100
10
1
0.1
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.
INPUT BIAS CURRENT
vs INPUT COMMON-MODE VOLTAGE
Common-Mode Voltage (V)
Input Bias Current (pA)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0 –10123456
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
Output Current (mA)
Output Voltage (V)
5
4
3
2
1
0
0 ±10 ±20 ±30 ±40 ±50 ±60 ±70 ±80 ±90 ±100
+125°C +25°C –55°C
+125°C +25°C –55°C
OFFSET VOLTAGE DRIFT MAGNITUDE
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage Drift (µV/°C)
25
20
15
10
5
0
Typical production
distribution of
packaged units.
01234567891011121315
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
10M1M
Frequency (Hz)
100k
6
5
4
3
2
1
0
Output Voltage (Vp-p)
V
S
= 5.5V
V
S
= 2.7V
Maximum output
voltage without
slew rate-induced
distortion.
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage (µV)
18
16
14
12
10
8
6
4
2
0
Typical production
distribution of
packaged units.
–500
–400
–300
–200
–100
0
100
200
300
400
500
7
®
OPA340/2340/4340
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.
SMALL-SIGNAL STEP RESPONSE
CL = 100pF
1µs/div
50mV/div
1µs/div
LARGE-SIGNAL STEP RESPONSE
CL = 100pF
1V/div
SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE
10k1000
Load Capacitance (pF)
100
60
50
40
30
20
10
0
Overshoot (%)
G = +1
G = –1
G = –5
See text for
reducing overshoot.
G = +5
SETTLING TIME vs CLOSED-LOOP GAIN
100
10
1
0.1
Settling Time (µs)
Closed-Loop Gain (V/V)
1 10 100 1000
0.1%
0.01%
8
®
OPA340/2340/4340
APPLICATIONS INFORMATION
OPA340 series op amps are fabricated on a state-of-the-art
0.6 micron CMOS process. They are unity-gain stable and
suitable for a wide range of general purpose applications.
Rail-to-rail input/output make them ideal for driving sam-
pling A/D converters. In addition, excellent ac performance
makes them well-suited for audio applications. The class AB
output stage is capable of driving 600Ω loads connected to
any point between V+ and ground.
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
OPA340 in unity-gain configuration. Operation is from a
single +5V supply with a 10kΩ load connected to VS/2.
The input is a 5Vp-p sinusoid. Output voltage is approxi-
mately 4.98Vp-p.
Power supply pins should be bypassed with 0.01µF ceramic
capacitors.
OPERATING VOLTAGE
OPA340 series op amps are fully specified from +2.7V to
+5V. However, supply voltage may range from +2.5V to
+5.5V. Parameters are guaranteed over the specified supply
range—a unique feature of the OPA340 series. In addition,
many specifications apply from –40°C to +85°C. Most
behavior remains virtually unchanged throughout the full
operating voltage range. Parameters which vary signifi-
cantly with operating voltages or temperature are shown in
the typical performance curves.
RAIL-TO-RAIL INPUT
The input common-mode voltage range of the OPA340
series extends 500mV beyond the supply rails. This is
achieved with a complementary input stage—an N-channel
input differential pair in parallel with a P-channel differen-
tial pair (see Figure 2). The N-channel pair is active for input
voltages close to the positive rail, typically
(V+) –1.3V to 500mV above the positive supply, while the
P-channel pair is on for inputs from 500mV 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 transi-
tion 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.
FIGURE 2. Simplified Schematic.
VS = +5, G = +1, RL = 10kΩ
VIN
2V/div
FIGURE 1. Rail-to-Rail Input and Output.
V
BIAS1
V
BIAS2
V
IN
+V
IN
–
Class AB
Control
Circuitry V
O
V–
(Ground)
V+
Reference
Current
5
5
0
VOUT
9
®
OPA340/2340/4340
OPA340 series op amps are laser-trimmed to the reduce
offset voltage difference between the N-channel and
P-channel input stages, resulting in improved common-
mode rejection and a smooth transition between the
N-channel pair and the P-channel pair. However, within the
400mV transition region PSRR, CMRR, offset voltage,
offset drift, and THD may be degraded compared to opera-
tion outside this region.
A double-folded cascode adds the signal from the two input
pairs and presents a differential signal to the class AB output
stage. Normally, input bias current is approximately 200fA,
however, input voltages exceeding the power supplies by
more than 500mV can cause excessive current to flow in or
out of the input pins. Momentary voltages greater than
500mV beyond the power supply can be tolerated if the
current on the input pins is limited to 10mA. This is easily
accomplished with an input resistor as shown in Figure 3.
Many input signals are inherently current-limited to less
than 10mA, therefore, a limiting resistor is not required.
CAPACITIVE LOAD AND STABILITY
OPA340 series op amps can drive a wide range of capacitive
loads. However, all op amps under certain conditions may
become unstable. Op amp configuration, gain, and load
value are just a few of the factors to consider when determin-
ing stability. An op amp in unity gain configuration is the
most susceptible to the effects of capacitive load. The
capacitive load reacts with the op amp’s output resistance,
along with any additional load resistance, to create a pole in
the small-signal response which degrades the phase margin.
In unity gain, OPA340 series op amps perform well, with a
pure capacitive load up to approximately 1000pF. Increasing
gain enhances the amplifier’s ability to drive more capaci-
tance. See the typical performance curve “Small-Signal
Overshoot vs Capacitive Load.”
One method of improving capacitive load drive in the unity
gain configuration is to insert a 10Ω to 20Ω resistor in series
with the output, as shown in Figure 4. This significantly
reduces ringing with large capacitive loads. However, if
there is a resistive load in parallel with the capacitive load,
it creates a voltage divider introducing a dc error at the
output and slightly reduces output swing. This error may be
insignificant. For instance, with RL = 10kΩ and RS = 20 Ω,
there is only about a 0.2% error at the output.
DRIVING A/D CONVERTERS
OPA340 series op amps are optimized for driving medium
speed (up to 100kHz) sampling A/D converters. However,
they also offer excellent performance for higher speed
converters. The OPA340 series provides an effective means
of buffering the A/D’s input capacitance and resulting
charge injection while providing signal gain.
Figures 5 and 6 show the OPA340 driving an ADS7816.
The ADS7816 is a 12-bit, micro-power sampling converter
in the tiny MSOP-8 package. When used with the minia-
ture package options of the OPA340 series, the combina-
tion is ideal for space-limited and low power applications.
For further information consult the ADS7816 data sheet.
With the OPA340 in a noninverting configuration, an RC
network at the amplifier’s output can be used to filter high
frequency noise in the signal (Figure 5). In the inverting
configuration, filtering may be accomplished with a ca-
pacitor across the feedback resistor (Figure 6).
FIGURE 3. Input Current Protection for Voltages Exceeding
the Supply Voltage.
5kΩ
OPAx340
10mA max
V+
V
IN
V
OUT
I
OVERLOAD
RAIL-TO-RAIL OUTPUT
A class AB output stage with common-source transistors is
used to achieve rail-to-rail output. For light resistive loads
(>50kΩ), the output voltage is typically a few millivolts
from the supply rails. With moderate resistive loads (2kΩ to
50kΩ), the output can swing to within a few tens of milli-
volts from the supply rails and maintain high open-loop
gain. See the typical performanc curve “Output Voltage
Swing vs Output Current.”
FIGURE 4. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive.
10Ω to
20Ω
OPAx340
V+
V
IN
V
OUT
R
S
R
L
C
L
10
®
OPA340/2340/4340
FIGURE 5. OPA340 in Noninverting Configuration Driving ADS7816.
FIGURE 6. OPA340 in Inverting Configuration Driving ADS7816.
FIGURE 7. Speech Bandpass Filter.
ADS7816
12-Bit A/D
DCLOCK
DOUT
CS/SHDN
OPA340
+5V
VIN V+
2
+In
3
–In
VREF
8
4GND
Serial
Interface
1
0.1µF 0.1µF
7
6
5
NOTE: A/D Input = 0 to VREF
5kΩ5kΩ
330pF
VIN = 0V to –5V for 0V to 5V output.
ADS7816
12-Bit A/D
DCLOCK
D
OUT
CS/SHDN
OPA340
+5V
V
IN
V+
2
+In
3
–In
V
REF
8
4GND
Serial
Interface
1
0.1µF 0.1µF
7
6
5
NOTE: A/D Input = 0 to V
REF
V
IN
= 0V to 5V for
0V to 5V output.
RC network filters high frequency noise.
500Ω
3300pF
243kΩ
10MΩ
10MΩ
1.74MΩ
220pF
47pF
200pF
1/2
OPA2340
+5V
V
IN
R
L
1/2
OPA2340
Filters 160Hz to 2.4kHz
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 2000, Texas Instruments Incorporated
