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TS636I Datasheet(PDF) 4 Page - STMicroelectronics |
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TS636I Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 9 page TS636 4/9 DIGITAL INPUTS SIMPLIFIED SCHEMATIC The TS636 consists of two independent channels. Each channel has two stages. The first is a very low noise digitally controlled variable gain amplifier (range 0 to 18dB). The TS636 features a high input impedance and a low noise current. To minimize the overall noise figure, the source impedance must be less than 3k Ω. This value gives an equal contribution of voltage and current noises. The second stage is a gain/attenuation stage (+12dB to -9dB) featuring a low output impedance. This output stage can drive loads as low as 500 Ω. POWER DOWN MODE POSITION Pin Parameter Min. Typ. Max. Unit GC1, GC2, GC3 and GC4 Low Level 0 0.8 V High Level 2 3.3 Power Down Thershold Voltage for Power Down Mode (high level active) 0 0.8 V 23.3 + _ _ + + _ _ + v v GAIN CONTROL LOGIC DECODER Input1 + _ _ + v Input2 +Vcc2 Digital GND (DGND) Ouput2 Ouput1 +Vcc1 -Vcc Analog GND (AGND) GC2 GC1 GC3 GC4 v v v Power Down +Vcc -Vcc +Vcc -Vcc Power Down Input Output |
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