Datasheet LTC1992 (Analog Devices) - 26

LTC1992 Family
APPLICATIONS INFORMATION Op Amp Fully Differential Amplifier
–IN – –IN – + +OUT LTC1992 OUT V LTC1992 OCM AO AO +IN + +IN + – –OUT • DIFFERENTIAL INPUT • DIFFERENTIAL INPUT • HIGH OPEN-LOOP GAIN • HIGH OPEN-LOOP GAIN • SINGLE-ENDED OUTPUT • DIFFERENTIAL OUTPUT • VOCM INPUT SETS OUTPUT COMMON MODE LEVEL
Op Amp with Negative Feedback Fully Differential Amplifier with Negative Feedback
RFB RFB R R IN IN VIN – –VIN – + +V V OUT OCM LTC1992 VOUT LTC1992 RIN – + +VIN + –V V R OUT OCM FB GAIN = – RIN R V FB OCM RFB GAIN = – RIN 1992 F01
Figure 1. Comparison of an Op Amp and a Fully Differential Amplifier
RFB +VS 3 LTC1992 RIN –IN INM +VIN 1 V+ SP + +OUT R 4 +V MID1 OUT 200k + RCMP V 7 MID 30k RMID2 – – 200k A1 A2 + + V– RCMM 30k V 2 OCM + –OUT 5 –V – OUT S R M IN +IN INP –VIN 8 6 –VS RFB 1992 F02
Figure 2. LTC1992 Functional Block Diagram with External Gain Setting Resistors
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