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PDF ICL7612 Data sheet ( Hoja de datos )
| Número de pieza | ICL7612 | |
| Descripción | (ICL7611 / ICL7612) 1.4MHz / Low Power CMOS Operational Amplifiers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
ICL7611, ICL7612
October 1999 File Number 2919.5
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, 100µA, or 10µA, with no external
components. This results in power consumption as low as
20µW. 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 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
ICL7611BCPA
ICL7611DCPA
ICL7611DCBA
TEMP.
RANGE
(oC)
0 to 70
0 to 70
0 to 70
PACKAGE
8 Ld PDIP - B Grade
8 Ld PDIP - D Grade
8 Ld SOIC - D Grade
ICL7611DCBA-T
ICL7612BCPA
ICL7612DCPA
ICL7612DCBA
ICL7612DCBA-T
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
8 Ld SOIC - D Grade
Tape and Reel
8 Ld PDIP - B Grade
8 Ld PDIP - D Grade
8 Ld SOIC - D Grade
8 Ld SOIC - D Grade
Tape and Reel
PKG.
NO.
E8.3
E8.3
M8.15
M8.15
E8.3
E8.3
M8.15
M8.15
Features
• Wide Operating Voltage Range . . . . . . . . . . . ±1V to ±8V
• High Input Impedance . . . . . . . . . . . . . . . . . . . . . . 1012Ω
• Programmable Power Consumption. . . . . . Low as 20µW
• 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
BAL 1
-IN 2
+IN 3
V- 4
-
+
8 IQ SET
7 V+
6 OUT
5 BAL
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
1 page  
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 IQ
The ICL7611 and ICL7612 have a similar IQ set-up 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 quiescent current. To set the IQ
connect the IQ terminal as follows:
IQ = 10µA - IQ pin to V+
IQ = 100µA - IQ pin to ground. If this is not possible, any
voltage from V+ - 0.8 to V- +0.8 can be used.
IQ = 1mA - IQ 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 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
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 100µA the nulling range
provided is adequate for all VOS selections; however with
IQ = 10µA, nulling may not be possible with higher values
of VOS.
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 VSUPP ≥ ±1.5V. For those
applications where VSUPP ≤ ±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 VSUPPLY = ±1V,
the input CMVR would be +0.6V to -1.1V).
Operation At VSUPPLY = ±1V
Operation at VSUPPLY = ±1V is guaranteed at IQ = 10µA for
A and B grades 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 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 IQ shown. The value of IQ must be
chosen by the designer with regard to frequency response
and power dissipation.
VIN +
ICL7612
-
VOUT
RL ≥10K
FIGURE 1. SIMPLE FOLLOWER (NOTE 4)
+5
VIN
100K
+5
-
ICL7612
+
VOUT
TO CMOS OR
LPTTL LOGIC
1M
NOTE:
4. By using the ICL7612 in this application, the circuit will follow rail
to rail inputs.
FIGURE 2. LEVEL DETECTOR (NOTE 4)
5
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