ICL7642 Datasheet PDF - Intersil Corporation
| Part Number | ICL7642 | |
| Description | (ICL7621 / ICL7641 / ICL7642) Dual/Quad / Low Power CMOS Operational Amplifiers | |
| Manufacturers | Intersil Corporation | |
| Logo |  |
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Data Sheet
ICL7621, ICL7641, ICL7642
April 1999 File Number 3403.3
Dual/Quad, 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. They 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. The output swing ranges to within a few millivolts of the
supply voltages.
The quiescent supply current of these amplifiers is set to 3
different ranges at the factory. Both amps of the dual
ICL7621 are set to an IQ of 100µA, while each amplifier of
the quad ICL7641 and ICL7642 are set to an IQ of 1mA and
10µA respectively. This results in power consumption as low
as 20µW per amplifier.
Of particular significance is the extremely low (1pA) input
current, input noise current of 0.01pA/√Hz, and 1012Ω 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/µs, and
unity gain bandwidth of 1MHz at IQ = 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.
Ordering Information
PART NUMBER
ICL7621ACPA
ICL7621BCPA
ICL7621DCPA
ICL7621AMTV
ICL7621DCBA
ICL7621DCBA-T
ICL7641ECPD
ICL7642ECPD
TEMP.
RANGE (oC)
PACKAGE
0 to 70
0 to 70
0 to 70
-55 to 125
0 to 70
0 to 70
0 to 70
0 to 70
8 Ld PDIP -
A Grade - IQ = 100µA
8 Ld PDIP -
B Grade - IQ = 100µA
8 Ld PDIP -
D Grade - IQ = 100µA
8 Pin Metal Can -
A Grade - IQ = 100µA
8 Ld SOIC -
D Grade - IQ = 100µA
8 Ld SOIC - D Grade -
Tape and Reel -
IQ = 100µA
14 Ld PDIP - E Grade -
IQ = 1mA
14 Ld PDIP - E Grade -
IQ = 10µA
PKG.
NO.
E8.3
E8.3
E8.3
T8.C
M8.15
M8.15
E14.3
E14.3
Features
• Wide Operating Voltage Range . . . . . . . . . . . ±1V to ±8V
• High Input Impedance . . . . . . . . . . . . . . . . . . . . . . .1012Ω
• Input Current Lower Than BIFETs . . . . . . . . . . . 1pA (Typ)
• Output Voltage Swing . . . . . . . . . . . . . . . . . . . . V+ and V-
• Available as Duals and Quads (Refer to ICL7611 for Singles)
• Low Power Replacement for Many Standard Op Amps
Applications
• Portable Instruments
• Telephone Headsets
• Hearing Aid/Microphone Amplifiers
• Meter Amplifiers
• Medical Instruments
• High Impedance Buffers
Pinouts
ICL7621 (PDIP, SOIC)
TOP VIEW
OUTA 1
-INA 2
+INA 3
V- 4
-
8 V+
7 OUTB
- 6 -INB
5 +INB
ICL7621 (METAL CAN)
TOP VIEW
V+
OUTA 1
8
7 OUTB
-INA 2
6 -INB
+INA 3
5 +INB
4
V-
ICL7641 (PDIP), ICL7642 (PDIP)
TOP VIEW
OUTA 1
-INA 2
+INA 3
V+ 4
+INB 5
-INB 6
OUTB 7
14 OUTD
13 -IND
12 +IND
11 V-
10 +INC
9 -INC
8 OUTC
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
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ICL7621, ICL7641, ICL7642
Choosing the Proper IQ
Each device in the ICL76XX family has a similar IQ setup
scheme, which allows the amplifier to be set to nominal
quiescent currents of 10µA, 100µA or 1mA. These current
settings change only very slightly over the entire supply
voltage range. The ICL7611/12 have an external IQ control
terminal, permitting user selection of each amplifiers’
quiescent current. The ICL7621 and ICL7641/7642 have
fixed IQ settings:
ICL7621 (Dual) - IQ = 100µA
ICL7641 (Quad) - IQ = 1mA
ICL7642 (Quad) - IQ = 10µA
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 IQ settings.
This allows output swings to almost the supply rails for
output loads of 1MΩ, 100kΩ, and 10kΩ, 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
VIN + ICL76XX
VOUT
-
RL ≥ 10kΩ
Typical Operating Characteristics). During the transition from
Class A to Class B operation, the output transfer
characteristic is nonlinear and the voltage gain decreases.
Frequency Compensation
The ICL76XX are internally compensated, and are stable
for closed loop gains as low as unity with capacitive loads
up to 100pF.
Operation At VSUPPLY = ±1V
Operation at VSUPPLY = ±1V is guaranteed for the
ICL7642C only.
Output swings to within a few millivolts of the supply rails are
achievable for RL ≥ 1MΩ. Guaranteed input CMVR is ±0.6V
minimum and typically +0.9V to -0.7V at VSUPPLY = ±1V. For
applications where greater common mode range is
desirable, refer to the ICL7612 data sheet.
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 IQ shown. The value of IQ must be
chosen by the designer with regard to frequency response
and power dissipation.
+5
VIN
100kΩ
+5
- ICL76XX
+
VOUT
TO CMOS OR
LPTTL LOGIC
FIGURE 1. SIMPLE FOLLOWER
1MΩ
FIGURE 2. LEVEL DETECTOR
1µF+
-
ICL76XX
λ+
VOUT
NOTE: Low leakage currents allow integration times up to
several hours.
FIGURE 3. PHOTOCURRENT INTEGRATOR
5
-
1/2
ICL7621
+
1MΩ
1MΩ
-
1/2
ICL7621
+
1MΩ
V- V+
DUTY CYCLE
680kΩ
WAVEFORM GENERATOR
NOTE: Since the output range swings exactly from rail to rail, fre-
quency and duty cycle are virtually independent of power supply
variations.
FIGURE 4. TRIANGLE/SQUARE WAVE GENERATOR
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