TC7650CPA Microchip

TC7650 Chopper Stabilized Operational Amplifier Package Type Features Low Input Offset Voltage: 0.7V Typ 8-Pin DIP Low Input Offset Voltage Drift: 0.05V/C Max C 1 8 C Low Input Bias Current: 10pA Max A B 12 High Impedance Differential CMOS Inputs: 10 V INPUT 2 7 DD High Open Loop Voltage Gain: 120dB Min. + TC7650CPA INPUT 3 6 OUTPUT Low Input Noise Voltage: 2.0Vp-p V High Slew Rate: 2.5V/sec. SS 4 5 OUTPUT CLAMP Low Power Operation: 20mW Output Clamp Speeds Recovery Time 14-Pin DIP Compensated Internally for Stable Unity Gain Operation C B 1 14 INT/EXT Direct Replacement for ICL7650 C Available in 8-Pin Plastic DIP and 14-Pin Plastic A 2 13 EXT CLK IN DIP Packages NC 3 12 INT CLK OUT Applications INPUT 4 11 V TC7650CPD DD Instrumentation + INPUT 5 10 OUTPUT Medical Instrumentation NC 6 9 OUTPUT CLAMP Embedded Control Temperature Sensor Amplifier V 7 8 C SS RETN Strain Gage Amplifier NC = NO INTERNAL CONNECTION Device Selection Table Part Temperature Package Max V OS Number Range TC7650CPA 8-Pin PDIP 0C to +70C 5 V TC7650CPD 14-Pin PDIP 0C to +70C 5 V 2001-2012 Microchip Technology Inc. DS21463C-page 1TC7650 The TC7650 nulling scheme corrects both DC V General Description OS errors and V drift errors with temperature. A nulling OS The TC7650 CMOS chopper stabilized operational amplifier alternately corrects its own V errors and the OS amplifier practically removes offset voltage error terms main amplifier V error. Offset nulling voltages are OS from system error calculations. The 5 V maximum V OS stored on two user supplied external capacitors. The specification, for example, represents a 15 times capacitors connect to the internal amplifier V null OS improvement over the industry standard OP07E. The points. The main amplifier input signal is never 50nV/C offset drift specification is over 25 times lower switched. Switching spikes are not present at the than the OP07E. The increased performance elimi- TC7650 output. nates V trim procedures, periodic potentiometer OS The 14-pin dual-in-line package (DIP) has an external adjustment and the reliability problems caused by dam- oscillator input to drive the nulling circuitry for optimum aged trimmers. noise performance. Both the 8 and 14-pin DIPs have The TC7650 performance advantages are achieved an output voltage clamp circuit to minimize overload without the additional manufacturing complexity and recovery time. cost incurred with laser orzener za V trim tech- OS niques. Functional Block Diagram Output 14-Pin DIP Only Clamp Output Clamp INT/EXT Circuit Oscillator EXT CLK IN CLK OUT Main Amplifier AB Inputs Output C B NULL Intermod Compensation C A B B BA Null Amplifier TC7650 A *C RETN Null * For 8-Pin DIP, connect to V ss DS21463C-page 2 2001-2012 Microchip Technology Inc.