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TC7650 Scheda tecnica(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC7650 Scheda tecnica(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 7 page 3-273 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 CHOPPER-STABILIZED OPERATIONAL AMPLIFIER TC7650 GENERAL DESCRIPTION The TC7650 CMOS chopper-stabilized operational amplifier practically removes offset voltage error terms from system error calculations. The 5 µV maximum VOS specification, for example, represents a 15 times improve- ment over the industry-standard OP07E. The 50nV/ °C off- set drift specification is over 25 times lower than the OP07E. The increased performance eliminates VOS trim proce- dures, periodic potentiometer adjustment and the reliability problems caused by damaged trimmers. The TC7650 performance advantages are achieved without the additional manufacturing complexity and cost incurred with laser or "zener zap" VOS trim techniques. The TC7650 nulling scheme corrects both DC VOS errors and VOS drift errors with temperature. A nulling amplifier alternately corrects its own VOS errors and the main amplifier VOS error. Offset nulling voltages are stored on two user-supplied external capacitors. The capacitors connect to the internal amplifier VOS null points. The main amplifier input signal is never switched. Switching spikes are not present at the TC7650 output. The 14-pin dual-in-line package (DIP has an external oscillator input to drive the nulling circuitry for optimum noise performance. Both the 8 and 14-pin DIPs have an output voltage clamp circuit to minimize overload recovery time. PIN CONFIGURATIONS FEATURES s Low Input Offset Voltage ......................... 0.7 µV Typ s Low Input Offset Voltage Drift ......... 0.05 µV/°C Max s Low Input Bias Current ............................ 10pA Max s High Impedance Differential CMOS Inputs .... 1012 Ω s High Open-Loop Voltage Gain ................ 120dB Min s Low Input Noise Voltage ............................ 2.0 µVp-p s High Slew Rate .......................................... 2.5V/ µsec s Low-Power Operation ..................................... 20mW s Output Clamp Speeds Recovery Time s Compensated Internally for Stable Unity Gain Operation s Direct Replacement for ICL7650 s Available in 8-Pin Dip and 14-Pin Dip FUNCTIONAL BLOCK DIAGRAM ORDERING INFORMATION Temperature Max Part No. Package Range VOS TC7650CPA 8-Pin Plastic DIP 0 °C to +70°C5µV TC7650CPD 14-Pin Plastic DIP 0 °C to +70°C5µV TC7650 NULL NULL INPUTS OUTPUT CLAMP OUTPUT B B A CEXT CEXT FOR 8-PIN DIP, CONNECT TO VSS. NULL AMPLIFIER MAIN AMPLIFIER OUTPUT CLAMP CIRCUIT INTERMOD COMPENSATION OSCILLATOR AB INT/EXT EXT CLK IN CLK OUT 14-PIN DIP ONLY BA CRET * * TC7650-5 9/11/96 1 2 3 4 5 6 7 14 13 12 11 10 9 8 C NC (GUARD) 8-Pin DIP V SS V SS INT/EXT EXT CLK INPUT INT CLK OUTPUT OUTPUT OUTPUT CLAMP RETN B C A C VDD TC7650CPD 1 2 3 4 8 7 6 5 C OUTPUT A V DD TC7650CPA INPUT INPUT C B (+) (–) CLAMP INPUT (–) INPUT (+) NC (GUARD) 14-Pin DIP NC = NO INTERNAL CONNECTION |
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