File Number

2919.5

ICL7611, ICL7612

1.4MHz, Low Power CMOS Operational
Amplifiers

The ICL761X/762X/764X series is a family of monolithic
CMOS operational amplifiers. These devices provide the
designer with high performance operation at low supply
voltages and selectable quiescent currents, and are an ideal
design tool when ultra low input current and low power
dissipation are desired.

The basic amplifier will operate at supply voltages ranging
from

1V to

8V, and may be operated from a single

Lithium cell.

A unique quiescent current programming pin allows setting
of standby current to 1mA, 100

A, or 10

A, with no external

components. This results in power consumption as low as
20

W. The output swing ranges to within a few millivolts of

the supply voltages.

Of particular significance is the extremely low (1pA) input
current, input noise current of 0.01pA/

Hz, and 10

input

impedance. These features optimize performance in very
high source impedance applications.

The inputs are internally protected. Outputs are fully
protected against short circuits to ground or to either supply.

AC performance is excellent, with a slew rate of 1.6V/

s, and

unity gain bandwidth of 1MHz at I

= 1mA.

Because of the low power dissipation, junction temperature
rise and drift are quite low. Applications utilizing these
features may include stable instruments, extended life
designs, or high density packages.

Features

· Wide Operating Voltage Range . . . . . . . . . . .

1V to

· High Input Impedance . . . . . . . . . . . . . . . . . . . . . . 10

· Programmable Power Consumption . . . . . . Low as 20

· Input Current Lower Than BIFETs . . . . . . . . . . . 1pA (Typ)

· Output Voltage Swing . . . . . . . . . . . . . . . . . . . V+ and V-

· Input Common Mode Voltage Range Greater Than Supply

Rails (ICL7612)

Applications

· Portable Instruments

· Telephone Headsets

· Hearing Aid/Microphone Amplifiers

· Meter Amplifiers

· Medical Instruments

· High Impedance Buffers

Pinouts

ICL7611, ICL7612

(PDIP, SOIC)

TOP VIEW

Ordering Information

PART

NUMBER

TEMP.

RANGE

(

PACKAGE

PKG.

NO.

ICL7611BCPA

0 to 70

8 Ld PDIP - B Grade

E8.3

ICL7611DCPA

0 to 70

8 Ld PDIP - D Grade

E8.3

ICL7611DCBA

0 to 70

8 Ld SOIC - D Grade

M8.15

ICL7611DCBA-T

0 to 70

8 Ld SOIC - D Grade
Tape and Reel

M8.15

ICL7612BCPA

0 to 70

8 Ld PDIP - B Grade

E8.3

ICL7612DCPA

0 to 70

8 Ld PDIP - D Grade

E8.3

ICL7612DCBA

0 to 70

8 Ld SOIC - D Grade

M8.15

ICL7612DCBA-T

0 to 70

8 Ld SOIC - D Grade
Tape and Reel

M8.15

BAL

-IN

+IN

V-

SET

V+

OUT

BAL

Data Sheet

October 1999

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Intersil Corporation 1999

Absolute Maximum Ratings

Thermal Information

Supply Voltage V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . V- -0.3 to V+ +0.3V
Differential Input Voltage (Note 1) . . . . . . . . . [(V+ +0.3) - (V- -0.3)]V
Duration of Output Short Circuit (Note 2). . . . . . . . . . . . . . Unlimited

Operating Conditions

Temperature Range

ICL76XXC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0

C to 70

Thermal Resistance (Typical, Note 3)

(

C/W)

PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

130

SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

170

Maximum Junction Temperature (Plastic Package) . . . . . . . .150

Maximum Storage Temperature Range . . . . . . . . . . -65

C to 150

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300

(SOIC - Lead Tips Only)

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

1. Long term offset voltage stability will be degraded if large input differential voltages are applied for long periods of time.

2. The outputs may be shorted to ground or to either supply, for V

SUPPLY

10V. Care must be taken to insure that the dissipation rating is not

exceeded.

is measured with the component mounted on an evaluation PC board in free air.

Electrical Specifications

SUPPLY

5V, Unless Otherwise Specified

PARAMETER

SYMBOL

TEST

CONDITIONS

TEMP (

ICL7611B, ICL7612B

ICL7611D, ICL7612D

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

Input Offset Voltage

100k

Full

Temperature
Coefficient of V

100k

Input Offset Current

0.5

Full

300

Input Bias Current

BIAS

1.0

Full

400

Common Mode
Voltage Range
(Except ICL7612)

CMR

= 10

4.4

= 100

4.2

= 1mA

3.7

Extended Common
Mode Voltage Range
(ICL7612 Only)

CMR

= 10

5.3

= 100

+5.3, -5.1

= 1mA

+5.3, -4.5

Output Voltage Swing

OUT

= 10

A, R

= 1M

4.9

Full

4.8

= 100

A, R

= 100k

4.9

Full

4.8

= 1mA, R

= 10k

4.5

Full

4.3

Large Signal Voltage
Gain

VOL

4.0V, R

= 1M

= 10

104

Full

4.0V, R

= 100k

= 100

102

Full

4.0V, R

= 10k

= 1mA

Full

ICL7611, ICL7612

Unity Gain Bandwidth

GBW

= 10

0.044

MHz

= 100

0.48

MHz

= 1mA

1.4

MHz

Input Resistance

Common Mode
Rejection Ratio

CMRR

100k

= 10

100k

= 100

100k

= 1mA

Power Supply
Rejection Ratio
(V

SUPPLY

8V to

2V)

PSRR

100k

= 10

100k

= 100

100k

= 1mA

Input Referred Noise
Voltage

= 100

, f = 1kHz

100

nV/

Input Referred Noise
Current

= 100

, f = 1kHz

0.01

pA/

Supply Current
(No Signal, No Load)

SUPPLY

SET = +5V, Low Bias

0.01

0.02

0.01

0.02

SET = 0V,

Medium Bias

0.1

0.25

0.1

0.25

SET = -5V, High Bias

1.0

2.5

1.0

2.5

Channel Separation

= 100

120

Slew Rate
(A

= 1, C

= 100pF,

= 8V

P-P

)

= 10

A, R

= 1M

0.016

= 100

A, R

= 100k

0.16

= 1mA, R

= 10k

1.6

Rise Time
(V

= 50mV,

= 100pF)

= 10

A, R

= 1M

= 100

A, R

= 100k

= 1mA, R

= 10k

0.9

Overshoot Factor
(V

= 50mV,

= 100pF)

= 10

A, R

= 1M

= 100

A, R

= 100k

= 1mA, R

= 10k

Electrical Specifications

SUPPLY

5V, Unless Otherwise Specified (Continued)

PARAMETER

SYMBOL

TEST

CONDITIONS

TEMP (

ICL7611B, ICL7612B

ICL7611D, ICL7612D

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

Electrical Specifications

SUPPLY

1V, I

= 10

A, Unless Otherwise Specified

PARAMETER

SYMBOL

TEST

CONDITIONS

TEMP

(

ICL7611B, ICL7612B

UNITS

MIN

TYP

MAX

Input Offset Voltage

100k

Full

Temperature Coefficient of V

100k

Input Offset Current

0.5

Full

300

Input Bias Current

BIAS

1.0

Full

500

Common Mode Voltage Range
(Except ICL7612)

CMR

0.6

ICL7611, ICL7612

Schematic Diagram

Extended Common Mode
Voltage Range (ICL7612 Only)

CMR

+0.6 to

-1.1

Output Voltage Swing

OUT

= 1M

0.98

Full

0.96

Large Signal Voltage Gain

VOL

0.1V, R

= 1M

Full

Unity Gain Bandwidth

GBW

0.044

MHz

Input Resistance

Common Mode Rejection Ratio

CMRR

100k

Power Supply Rejection Ratio

PSRR

100k

Input Referred Noise Voltage

= 100

, f = 1kHz

100

nV/

Input Referred Noise Current

= 100

, f = 1kHz

0.01

pA/

Supply Current

SUPPLY

No Signal, No Load

Slew Rate

= 1, C

= 100pF,

= 0.2V

P-P

, R

= 1M

0.016

Rise Time

= 50mV, C

= 100pF R

= 1M

Overshoot Factor

= 50mV, C

= 100pF, R

= 1M

Electrical Specifications

SUPPLY

1V, I

= 10

A, Unless Otherwise Specified (Continued)

PARAMETER

SYMBOL

TEST

CONDITIONS

TEMP

(

ICL7611B, ICL7612B

UNITS

MIN

TYP

MAX

INPUT STAGE

SETTING STAGE

OUTPUT STAGE

V+

OUTPUT

V-

N11

N10

= 9pF

= 33pF

6.3V

V+

SET

BAL

100K

900K

+INPUT

-INPUT

V-

V-
V+

V+

BAL

6.3V

ICL7611, ICL7612

Application Information

Static Protection

All devices are static protected by the use of input diodes.
However, strong static fields should be avoided, as it is
possible for the strong fields to cause degraded diode
junction characteristics, which may result in increased input
leakage currents.

Latchup Avoidance

Junction-isolated CMOS circuits employ configurations which
produce a parasitic 4-layer (PNPN) structure. The 4-layer
structure has characteristics similar to an SCR, and under
certain circumstances may be triggered into a low impedance
state resulting in excessive supply current. To avoid this
condition, no voltage greater than 0.3V beyond the supply
rails may be applied to any pin. In general, the op amp
supplies must be established simultaneously with, or before
any input signals are applied. If this is not possible, the drive
circuits must limit input current flow to 2mA to prevent latchup.

Choosing the Proper I

The ICL7611 and ICL7612 have a similar I

set-up scheme,

which allows the amplifier to be set to nominal quiescent
currents of 10

A, 100

A or 1mA. These current settings

change only very slightly over the entire supply voltage
range. The ICL7611/12 have an external I

control terminal,

permitting user selection of quiescent current. To set the I

connect the I

terminal as follows:

= 10

A - I

pin to V+

= 100

A - I

pin to ground. If this is not possible, any

voltage from V+ - 0.8 to V- +0.8 can be used.

= 1mA - I

pin to V-

NOTE: The output current available is a function of the quiescent
current setting. For maximum peak-to-peak output voltage swings
into low impedance loads, IQ of 1mA should be selected.

Output Stage and Load Driving Considerations

Each amplifiers' quiescent current flows primarily in the
output stage. This is approximately 70% of the I

settings.

This allows output swings to almost the supply rails for
output loads of 1M

, 100k

, and 10k

, using the output

stage in a highly linear class A mode. In this mode,
crossover distortion is avoided and the voltage gain is
maximized. However, the output stage can also be operated
in Class AB for higher output currents. (See graphs under
Typical Operating Characteristics). During the transition from
Class A to Class B operation, the output transfer
characteristic is non-linear and the voltage gain decreases.

Input Offset Nulling

Offset nulling may be achieved by connecting a 25K pot
between the BAL terminals with the wiper connected to V+.
At quiescent currents of 1mA and 100

A the nulling range

provided is adequate for all V

selections; however with

= 10

A, nulling may not be possible with higher values

of V

Frequency Compensation

The ICL7611 and ICL7612 are internally compensated, and
are stable for closed loop gains as low as unity with
capacitive loads up to 100pF.

Extended Common Mode Input Range

The ICL7612 incorporates additional processing which
allows the input CMVR to exceed each power supply rail by
0.1V for applications where V

SUPP

1.5V. For those

applications where V

SUPP

1.5V the input CMVR is limited

in the positive direction, but may exceed the negative supply
rail by 0.1V in the negative direction (e.g., for V

SUPPLY

1V,

the input CMVR would be +0.6V to -1.1V).

Operation At V

SUPPLY

Operation at V

SUPPLY

1V is guaranteed at I

= 10

A for

A and B grades only.

Output swings to within a few millivolts of the supply rails are
achievable for R

. Guaranteed input CMVR is

0.6V

minimum and typically +0.9V to -0.7V at V

SUPPLY

1V. For

applications where greater common mode range is
desirable, refer to the description of ICL7612 above.

Typical Applications

The user is cautioned that, due to extremely high input
impedances, care must be exercised in layout, construction,
board cleanliness, and supply filtering to avoid hum and
noise pickup.

Note that in no case is I

shown. The value of I

must be

chosen by the designer with regard to frequency response
and power dissipation.

ICL7612

OUT

10K

FIGURE 1. SIMPLE FOLLOWER (NOTE 4)

ICL7612

OUT

100K

TO CMOS OR
LPTTL LOGIC

NOTE:

4. By using the ICL7612 in this application, the circuit will follow rail

to rail inputs.

FIGURE 2. LEVEL DETECTOR (NOTE 4)

ICL7611, ICL7612

OUT

ICL7611

NOTE: Low leakage currents allow integration times up to several
hours.

FIGURE 3. PHOTOCURRENT INTEGRATOR

ICL7611

DUTY CYCLE

V-

V+

680k

WAVEFORM GENERATOR

NOTE: Since the output range swings exactly from rail to rail, frequency
and duty cycle are virtually independent of power supply variations.

FIGURE 4. PRECISE TRIANGLE/SQUARE WAVE GENERATOR

FIGURE 5. AVERAGING AC TO DC CONVERTER FOR A/D

CONVERTERS SUCH AS ICL7106, ICL7107,
ICL7109, ICL7116, ICL7117

FIGURE 6. BURN-IN AND LIFE TEST CIRCUIT

FIGURE 7. V

NULL CIRCUIT

ICL7611

20K

2.2M

COMMON

10K

0.5

1.8K = 5%

SCALE

ADJUST

TO
SUCCEED-
ING
INPUT
STAGE

V-

OUT

V+

-8V

+8V

= 125

OUT

25k

V+

+ BAL

BAL

ICL7611, ICL7612

FIGURE 8. FIFTH ORDER CHEBYCHEV MULTIPLE FEEDBACK LOW PASS FILTER

ICL7611

INPUT

30K

160K

0.2

0.1

51K

100K

680K

360K

OUTPUT

(NOTE 5)

NOTES:

5. Note that small capacitors (25pF to 50pF) may be needed for stability in some cases.

6. The low bias currents permit high resistance and low capacitance values to be used to achieve low frequency cutoff. f

= 10Hz, A

VCL

= 4,

Passband ripple = 0.1dB.

Typical Performance Curves

FIGURE 9. SUPPLY CURRENT PER AMPLIFIER vs SUPPLY

VOLTAGE

FIGURE 10. SUPPLY CURRENT PER AMPLIFIER vs FREE-AIR

TEMPERATURE

FIGURE 11. INPUT BIAS CURRENT vs TEMPERATURE

FIGURE 12. LARGE SIGNAL DIFFERENTIAL VOLTAGE GAIN

vs FREE-AIR TEMPERATURE

10K

100

SUPPL

Y CURRENT (

SUPPLY VOLTAGE (V)

= 25

NO LOAD
NO SIGNAL

= 1mA

= 100

= 1mA

= 10

SUPPL

Y CURRENT (

-50

-25

100

125

FREE-AIR TEMPERATURE (

V+ - V- = 10V
NO LOAD
NO SIGNAL

= 1mA

= 100

= 10

-50

-25

100

125

FREE-AIR TEMPERATURE (

1000

100

1.0

0.1

INPUT BIAS CURRENT (pA)

-50

-25

100

125

FREE-AIR TEMPERATURE (

-75

1000

100

DIFFERENTIAL V

GE GAIN (kV/V)

SUPP

= 10V

OUT

= 8V

= 100k

= 100

= 10k

= 1mA

= 1M

= 10

ICL7611, ICL7612

FIGURE 13. LARGE SIGNAL FREQUENCY RESPONSE

FIGURE 14. COMMON MODE REJECTION RATIO vs FREE-AIR

TEMPERATURE

FIGURE 15. POWER SUPPLY REJECTION RATIO vs FREE-AIR

TEMPERATURE

FIGURE 16. EQUIVALENT INPUT NOISE VOLTAGE vs

FREQUENCY

FIGURE 17. OUTPUT VOLTAGE vs FREQUENCY

FIGURE 18. OUTPUT VOLTAGE vs FREQUENCY

Typical Performance Curves

(Continued)

DIFFERENTIAL V

GE GAIN (V/V)

0.1

1.0

100

10K

100K

FREQUENCY (Hz)

= 25

SUPP

= 15V

135

180

PHASE SHIFT (DEGREES)

= 1mA

= 100

PHASE SHIFT

= 1mA)

= 10

-50

-25

100

125

FREE-AIR TEMPERATURE (

-75

105

100

COMMON MODE REJECTION RA

TIO (dB)

SUPP

= 10V

= 10

= 100

= 1mA

100

SUPPL

Y V

GE REJECTION RA

TIO (dB)

-50

-25

100

125

-75

FREE-AIR TEMPERATURE (

= 1mA

= 100

= 10

SUPP

= 10V

600

500

400

300

200

100

UIV

ALENT INPUT NOISE V

GE (nV/

Hz)

100

10K

100K

FREQUENCY (Hz)

= 25

SUPP

16V

MAXIMUM OUTPUT V

GE (V

P-P

)

100

10K

100K

10M

FREQUENCY (Hz)

SUPP

= 1mA

= 10

= 100

= 25

SUPP

= 10V

= 1mA

MAXIMUM OUTPUT V

GE (V

P-P

)

10K

100K

10M

FREQUENCY (Hz)

= -55

= 25

= 125

ICL7611, ICL7612

FIGURE 19. OUTPUT VOLTAGE vs SUPPLY VOLTAGE

FIGURE 20. OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE

FIGURE 21. OUTPUT SOURCE CURRENT vs SUPPLY VOLTAGE

FIGURE 22. OUTPUT SINK CURRENT vs SUPPLY VOLTAGE

FIGURE 23. OUTPUT VOLTAGE vs LOAD RESISTANCE

FIGURE 24. VOLTAGE FOLLOWER LARGE SIGNAL PULSE

RESPONSE (I

= 1mA)

Typical Performance Curves

(Continued)

MAXIMUM OUTPUT V

GE (V

P-P

)

SUPPLY VOLTAGE (V)

= 25

= 100k

- 1M

= 10k

MAXIMUM OUTPUT V

GE (V

P-P

)

-75

-50

-25

100

125

FREE-AIR TEMPERATURE (

= 100k

= 10k

= 2k

SUPP

= 10V

= 1mA

MAXIMUM OUTPUT SOURCE CURRENT (mA)

SUPPLY VOLTAGE (V)

= 1mA

0.01

0.1

1.0

MAXIMUM OUTPUT SINK CURRENT (mA)

SUPPLY VOLTAGE (V)

= 10

= 100

= 1mA

MAXIMUM OUTPUT V

GE (V

P-P

)

0.1

1.0

100

LOAD RESISTANCE (k

)

V+ - V- = 10V
I

= 1mA

= 25

-2

-4

-6

INPUT AND OUTPUT V

GE (V)

TIME (

= 25

C, V

SUPP

= 10V

= 10k

, C

= 100pF

OUTPUT

INPUT

ICL7611, ICL7612

All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.

Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see web site www.intersil.com

Sales Office Headquarters

NORTH AMERICA
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (321) 724-7000
FAX: (321) 724-7240

EUROPE
Intersil SA
Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05

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7F-6, No. 101 Fu Hsing North Road
Taipei, Taiwan
Republic of China
TEL: (886) 2 2716 9310
FAX: (886) 2 2715 3029

FIGURE 25. VOLTAGE FOLLOWER LARGE SIGNAL PULSE

RESPONSE (I

= 100

FIGURE 26. VOLTAGE FOLLOWER LARGE SIGNAL PULSE

RESPONSE (I

= 10

Typical Performance Curves

(Continued)

-2

-4

-6

INPUT AND OUTPUT V

GE (V)

100

120

TIME (

= 25

C, V

SUPP

= 10V

= 100k

, C

= 100pF

OUTPUT

INPUT

-2

-4

-6

INPUT AND OUTPUT V

GE (V)

200

400

600

800

1000

1200

TIME (

= 25

C, V

SUPP

= 10V

= 1M

, C

= 100pF

OUTPUT

INPUT

ICL7611, ICL7612

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: ICL7612D

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: ICL7612D