5926-86877012A - Micross Components, Inc.

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

GENERAL DESCRIPTION

The AS111 is a voltage comparator that has input currents

nearly a thousand times lower than other similar devices like.

It is also designed to operate over a wider range of supply

voltages: from standard ±15V op amp supplies down to the

single 5V supply used for IC logic. Their output is compatible

with RTL, DTL and TTL as well as MOS circuits. Further,

they can drive lamps or relays, switching voltages up to 50V

at currents as high as 50 mA.

Both the inputs and the outputs of the AS111 can be

isolated from system ground, and the output can drive loads

referred to ground, the positive supply or the negative supply.

Offset balancing and strobe capability are provided and out-

puts can be wire OR’ed. Although slower than some devices

(200 ns response time vs 40 ns), this device is also much less

prone to spurious oscillations.

FEATURES

• Operates from single 5V supply

• Input current: 150 nA max. over temperature

• Offset current: 20 nA max. over temperature

• Differential input voltage range: ±30V

• Power consumption: 135 mW at ±15V

OPTIONS MARKINGS

• Packages

8 pin Ceramic DIP C008

14 pin Ceramic DIP C014

20 pin Ceramic LCC E020

8 Lead Metal Can TO08

• Temperature Ranges

Extended (-55oC to +125oC) XT

MIL-STD-883 paragraph 1.2.1

(-55oC to +125oC) /883

AVAILABLE AS MILITAR Y

SPECIFICATIONS

• SMD 5962-86877

• M38510/10304B

• MIL-STD-883, 1.2.1

Voltage Comparator

For more products and information

please visit our web site at

www.micross.com

PIN ASSIGNMENT

(Top View)

GND

INPUT+

INPUT-

V-

V+

OUTPUT

BALANCE/

STROBE

BALANCE

GND

INPUT+

INPUT-

V-

BALANCE

V+

OUTPUT

BALANCE/

STROBE

8 Pin Ceramic DIP (C008)

14 Pin Ceramic DIP (C014)

8 Lead Metal Can (TO08)

20 Pin Ceramic LCC (E020)

V+

GND

INPUT+

INPUT- BALANCE

V-

BALANCE/STROBE

OUTPUT

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL APPLICATIONS3

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL APPLICATIONS (CONTINUED)3

*Stresses greater than those listed under “Absolute Maximum

Ratings” may cause permanent damage to the device. This

is a stress rating only and functional operation of the device

at these or any other conditions above those indicated in the

operation section of this speciﬁ cation is not implied. Exposure

to absolute maximum rating conditions for extended periods

may affect reliability.

ABSOLUTE MAXIMUM RATINGS*,5

Total Supply Voltage (V84)................................................36V

Output to Negative Supply Voltage (V74)..........................50V

Ground to Negative Supply Voltage (V14).........................30V

Differential Input Voltage................................................±30V

Input Voltage4..................................................................±15V

Output Short Circuit Duration........................................10 sec

Lead Temperature (Soldering, 10 sec)...........................260°C

Voltage at Stobe Pin.....................................................V+ -5V

Note 4: This rating applies for ±15 supplies. The positive input voltage limit is 30V above the negative supply. The negative input voltage limit is equal to

the negative supply voltage or 30V below the positive supply, whichever is less.

Note 5: The maximum junction temperature of the AS111 is 150°C. For operating at elevated temperatures, devices in the TO08 package must be derated

based on a thermal resistance of 165°C/W, junction to ambient, or 20°C/W, junction to case. The thermal resistance of the dual-in-line

package is 110°C/W, junction to ambient.

NOTE: Do Not Ground Strobe Pin

NOTE 2: Typical input current is 50pV with inputs strobed off.

NOTE 3: Pin connections shown on schematic diagram and typical applications are for TO08 metal can package.

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

ELECTRICAL CHARACTERISTICS6

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Offset Voltage7TA = 25°C, RS < 50K 0.7 3.0 mV

Input Offset Current TA = 25°C 4.0 10 nA

Input Bias Current TA = 25°C 60 100 nA

Voltage Gain TA = 25°C 40 200 V/mV

Response Time8TA = 25°C 200 ns

Saturation Voltage VIN < -5mV, IOUT = 50mA, TA = 25°C 0.75 1.5 V

Strobe ON Current9TA = 25°C 2.0 5.0 mA

Output Leakage Current VIN > 5mV, IOUT = 35V, TA = 25°C, ISTROBE = 3mA 0.2 10 nA

Input Offset Voltage7RS < 50k 4.0 mV

Input Offset Current720 nA

Input Bias Current 150 nA

Input Voltage Range V+ = 15V, V- = -15V, Pin 7 Pull-Up May Go To 5V -14.5 13.8, -14.7 13.0 V

Saturation Voltage V+ > 4.5V, V- = 0, VIN < -6mV, IOUT < 8mA 0.23 0.4 V

Output Leakage Current VIN > 5mV, IOUT = 35V 0.1 0.5 µA

Positive Supply Current TA = 25°C 5.1 6.0 mA

Negative Supply Current TA = 25°C 4.1 5.0 mA

Note 6: These speciﬁ cations apply for VS=±15V and Ground pin at ground, and -55°C < TA < +125°C, unless otherwise

stated. The offset voltage, offset current and bias current speciﬁ cations apply for any supply voltage from a single 5V supply

up to ±15V supplies.

Note 7: The offset voltages and offset currents given are the maximum values required to drive the output within a volt of

either supply with a 1mA load. Thus, these parameters deﬁ ne an error band and take into account the worst-case effects of

voltage gain and RS.

Note 8: The response time speciﬁ ed (see deﬁ nitions) is for a 100 mV input step with 5 mV overdrive.

Note 9: This speciﬁ cation gives the range of current which must be drawn from the strobe pin to ensure the output is properly

disabled. Do not short the strobe pin to ground; it should be current driven at 3 to 5 mA.

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL PERFORMANCE CHARACTERISTICS

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)

CIRCUIT TECHNIQUES FOR AVOIDING

OSCILLATIONS IN COMPARATOR

APPLICATIONS

When a high-speed comparator such as the AS111 is

used

with fast input signals and low source impedances, the output

response will normally be fast and stable, assuming that the

power supplies have been bypassed (with 0.1 μF disccapaci-

tors), and that the output signal is routed well away from the

inputs (pins 2 and 3) and also away from pins 5 and 6.

However, when the input signal is a voltage ramp or a

slow sine wave, or if the signal source impedance is high (1

kW to 100 kW), the comparator may burst into oscillation

near the crossing-point. This is due to the high gain and wide

bandwidth of comparators like the AS111. To avoid oscillation

or instability in such a usage, several precautions are recom

mended, as shown in Figure 1 below.

1. The trim pins (pins 5 and 6) act as unwanted auxiliary

inputs. If these pins are not connected to a trim-pot, they

should be shorted together. If they are connected to a

trim-pot, a 0.01 μF capacitor C1 between pins 5 and 6

will minimize the susceptibility to AC coupling. A

smaller capacitor is used if pin 5 is used for positive

feedback as in Figure 1.

2. Certain sources will produce a cleaner comparator

out put waveform if a 100 pF to 1000 pF capacitor C2 is

connected directly across the input pins.

3. When the signal source is applied through a resistive

network, RS, it is usually advantageous to choose an

RS’ of substantially the same value, both for DC and for

dynamic (AC) considerations. Carbon, tin-oxide, and

metal-ﬁ lm resistors have all been used successfully in

comparator input circuitry. Inductive wirewound resistors

are not suitable.

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

(continued)

APPLICATION HINTS (CONTINUED)

4. When comparator circuits use input resistors (eg. sum-

ming resistors), their value and placement are par-

ticularly important. In all cases the body of the resistor

should be close to the device or socket. In other words

there should be very little lead length or printed-circuit

foil run between comparator and resistor to radiate or pick

up signals. The same applies to capacitors, pots, etc. For

example, if RS=10 kW, as little as 5 inches of lead between

the resistors and the input pins can result placing resistors

close to the comparator.

5. Since feedback to almost any pin of a comparator can

result in oscillation, the printed-circuit layout should be

engineered thoughtfully. Preferably there should be a

groundplane under the AS111 circuitry, for example, one

side of a double-layer circuit card. Ground foil (or, positive

supply or negative supply foil) should extend between the

output and the inputs, to act as a guard. The foil con-

nections for the inputs should be as small and compact as

possible, and should be essentially surrounded by ground

foil on all sides, to guard against capacitive cou-

pling from any high-level signals (such as the output). If

pins 5 and 6 are not used, they should be shorted to-

gether. If they are connected to a trim-pot, the trim-pot

should be located, at most, a few inches away from the

AS111, and the 0.01 μF capacitor should be installed. If

this capacitor cannot be used, a shielding printed-circuit

foil may be advisable between pins 6 and 7. The power

supply bypass capacitors should be located within a couple

inches of the AS111. (Some other comparators require the

power-supply bypass to be located immediately adjacent

to the comparator.)

6. It is a standard procedure to use hysteresis (positive

feedback) around a comparator, to prevent oscillation, and

to avoid excessive noise on the output because the com-

parator is a good ampliﬁ er for its own noise. In the circuit

of Figure 2, the feedback from the output to the positive

input will cause about 3 mV of hysteresis. However,

if RS is larger than 100Ω, such as 50 kΩ, it would not be

reasonable to simply increase the value of the positive

feedback resistor above 510 kΩ. The circuit of Figure 3

could be used, but it is rather awkward. See the notes in

paragraph 7 below.

7. When both inputs of the AS111 are connected to ac-

tive signals, or if a high-impedance signal is driving the

positive input of the AS111 so that positive feedback

would be disruptive, the circuit of Figure 1 is ideal. The

positive feedback is to pin 5 (one of the offset adjustment

pins). It is sufﬁ cient to cause 1 to 2 mV hysteresis and

sharp transitions with input triangle waves from a

few Hz to hundreds of kHz. The positive-feedback signal

across the 82Ω resistor swings 240 mV below the positive

supply. This signal is centered around the nominal voltage

at pin 5, so this feedback does not add to the VOS of the

comparator. As much as 8 mV of VOS can be trimmed out,

using the 5 kΩ pot and 3 kΩ resistor as shown.

8. These application notes apply speciﬁ cally to the AS111

family of comparators, and are applicable to all high-speed

comparators in general, (with the exception that not all

comparators have trim pins).

NOTE: Pin connections shown are for the TO08 can package.

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

APPLICATION HINTS (CONTINUED)

TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)

10Hz to 10kHz Voltage Controlled Oscillator

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

SCHEMATIC DIAGRAM20

NOTE 20: Pin connections shown on schematic diagram are for the TO08 can package.

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

Micross Case (Package Designator C008)

SMD 5962-86877, Case Outline P

MECHANICAL DEFINITIONS*

*All measurements are in inches.

MIN MA

A --- 0.200

b 0.014 0.026

b2 0.045 0.065

c 0.008 0.018

D --- 0.405

E 0.220 0.310

L 0.125 0.200

Q 0.015 0.060

S1 0.005 ---

S2 0.005 ---

SYMBOL MICROSS SPECIFICATIONS

0.100 BCS

0.300 BSC

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

Micross Case (Package Designator C014)

M38510/10304B, Case Outline C

MECHANICAL DEFINITIONS*

*All measurements are in inches.

MIN MA

A --- 0.200

b 0.014 0.026

b2 0.045 0.065

c 0.008 0.018

D --- 0.785

E 0.220 0.310

L 0.125 0.200

Q 0.015 0.060

S1 0.005 ---

S2 0.005 ---

SYMBOL MICROSS SPECIFICATIONS

0.100 BCS

0.300 BSC

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

Micross Case (Package Designator E020)

SMD 5962-86877, Case Outline 2

MECHANICAL DEFINITIONS*

*All measurements are in inches.

MIN MA

A 0.060 0.100

A1 0.050 0.088

B1 0.022 0.028

D/E 0.342 0.358

D1/E1 --- 0.358

D2/E2

L 0.045 0.055

L1 0.075 0.095

0.050 BSC

SYMBOL MICROSS SPECIFICATIONS

0.200 BSC

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

Micross Case (Package Designator TO08)

SMD 5962-86877, Case Outline G

MECHANICAL DEFINITIONS*

*All measurements are in inches.

MIN MA

A 0.165 0.185

b 0.016 0.019

b1 0.016 0.021

b2 0.016 0.024

D 0.335 0.375

D1 0.305 0.335

D2 0.110 0.160

F --- 0.040

k 0.027 0.034

k1 0.027 0.045

L 0.500 0.750

L1 --- 0.050

L2 0.250 ---

Q 0.010 0.045

D

0.200 BSC

0.100 BSC

45° BSC

SYMBOL MICROSS SPECIFICATIONS

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

*AVAILABLE PROCESSES:

XT = Extended Temperature Range -55oC to +125oC

/883C = MIL-STD-883 paragraph 1.2.1 -55oC to +125oC

ORDERING INFORMATION

EXAMPLE: AS111C008/XT

Device Number RAD Level Package Type Process

AS111 P,R, or blank C008 /*

EXAMPLE: AS111PCP10/883C

Device Number RAD Level Package Type Process

AS111 P,R, or blank CP10 /*

EXAMPLE: AS111PGW10/SPACE

Device Number RAD Level Package Type Process

AS111 P,R, or blank GW10 /*

EXAMPLE: AS111RTO99/SPACE

Device Number RAD Level Package Type Process

AS111 P,R or blank TO99 /*

Voltage

Comparator

AS111

Micross Components reserves the right to change products or speciﬁ cations without notice.

AS111

Rev. 1.7 01/10

MICROSS TO DSCC PART NUMBER

CROSS REFERENCE

* Micross part number is for reference only. Orders received referencing the SMD part number will be processed per the SMD.

MICROSS PART NUMBER DSCC PART NUMBER

AS111C008/883C 5962-8687701PA

AS111E020/883C 5926-86877012A

AS111TO08/883C 5962-8687701GA

AS111C008/883C M38510/10304BPA

AS111E020/883C M38510/10304B2A

AS111TO08/883C M38510/10304BGA

AS111C014/883C M38510/10304BCA