ICL7650S

Features:

Guaranteed Max Input Offset Voltage for All Temperature Ranges
Low Long-Term and Temperature Drifts of Input Offset Voltage
Guaranteed Max Input Bias Current. . . . . . . . . . . . . .10pA
Extremely Wide Common Mode
Voltage Range. . . . . . . . . . . . . . . . . . . . . . . +3.5V to -5V
Reduced Supply Current . . . . . . . . . . . . . . . . . . . . . . 2mA
Guaranteed Minimum Output Source/Sink Current
Extremely High Gain . . . . . . . . . . . . . . . . . . . . . . . .150dB
Extremely High CMRR and PSRR . . . . . . . . . . . . . .140dB
High Slew Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . .2.5V/µs
Wide Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2MHz
Unity-Gain Compensated
Clamp Circuit to Avoid Overload Recovery Problems and Allow Comparator Use
Extremely Low Chopping Spikes at Input and Output
Improved, Direct Replacement for Industry-Standard ICL7650 and other Second-Source Parts




Application

Clearly the applications of the ICL7650S will mirror those of other op amps. Anywhere that the performance of a circuit
can be significantly improved by a reduction of input-offset voltage and bias current, the ICL7650S is the logical choice.
Basic non-inverting and inverting amplifier circuits are shown n Figures 2 and 3. Both circuits can use the output clamping ircuit to enhance the overload recovery performance. The nly limitations on the replacement of other op amps by the CL7650S are the supply voltage (±8V Max) and the output




Specifications

Supply Voltage (V+ to V-). . . . . . . . . . . . . . . . . . . . . . . . . .18V
Input Voltage . . . . . . . . . . . . . . . . . . . . . (V+ +0.3) to (V- -0.3)
Voltage on Oscillator Control Pins . . . . . . . . . V+ to VDuration
of Output Short Circuit. . . . . . . . . . . . . . . . .. . . . . . . Indefinite
Current to Any Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
While Operating (Note 1) . . . . . . . . . . . . . . . . . . . . . . . .100µA

Description

The ICL7650S Super Chopper-Stabilized Amplifier offers exceptionally low input offset voltage and is extremely stable with respect to time and temperature. It is a direct replacement for the industry-standard ICL7650 offering improved input offset voltage, lower input offset voltage temperature coefficient, reduced input bias current, and wider common mode voltage range. All improvements are highlighted in bold italics in the Electrical Characteristics section. Critical parameters are guaranteed over the entire commercial temperature range. Intersils unique CMOS chopper-stabilized amplifier circuitry of the ICL7650S is user-transparent, virtually eliminating the traditional chopper amplifier problems of intermodulation effects, chopping spikes, and overrange lockup. The chopper amplifier achieves its low offset by comparing the inverting and non-inverting input voltages in a nulling amplifier, nulled by alternate clock phases. Two external capacitors of the ICL7650S are required to store the correcting potentials on the two amplifier nulling inputs; these are the only external components necessary. The clock oscillator and all the other control circuitry is entirely self-contained. However the 14 lead version includes a provision for the use of an external clock, if required for a particular application. In addition, the ICL7650S is internally compensated for unity-gain operation.