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LTC2295 Datasheet(PDF) 8 Page - Linear Technology |
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LTC2295 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LTC2295 2295fa 8 PI FU CTIO S AINA+ (Pin 1): Channel A Positive Differential Analog Input. AINA– (Pin 2): Channel A Negative Differential Analog Input. REFHA (Pins 3, 4): Channel A High Reference. Short together and bypass to Pins 5, 6 with a 0.1 µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 5, 6 with an additional 2.2 µF ceramic chip capacitor and to ground with a 1 µF ceramic chip capacitor. REFLA (Pins 5, 6): Channel A Low Reference. Short together and bypass to Pins 3, 4 with a 0.1 µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 3, 4 with an additional 2.2 µF ceramic chip capacitor and to ground with a 1 µF ceramic chip capacitor. VDD (Pins 7, 10, 18, 63): Analog 3V Supply. Bypass to GND with 0.1 µF ceramic chip capacitors. CLKA (Pin 8): Channel A Clock Input. The input sample starts on the positive edge. CLKB (Pin 9): Channel B Clock Input. The input sample starts on the positive edge. REFLB (Pins 11, 12): Channel B Low Reference. Short together and bypass to Pins 13, 14 with a 0.1 µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 13, 14 with an additional 2.2 µF ceramic chip ca- pacitor and to ground with a 1 µF ceramic chip capacitor. REFHB (Pins 13, 14): Channel B High Reference. Short together and bypass to Pins 11, 12 with a 0.1 µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 11, 12 with an additional 2.2 µF ceramic chip ca- pacitor and to ground with a 1 µF ceramic chip capacitor. AINB– (Pin 15): Channel B Negative Differential Analog Input. AINB+ (Pin 16): Channel B Positive Differential Analog Input. GND (Pins 17, 64): ADC Power Ground. SENSEB (Pin 19): Channel B Reference Programming Pin. Connecting SENSEB to VCMB selects the internal reference and a ±0.5V input range. VDD selects the internal reference and a ±1V input range. An external reference greater than 0.5V and less than 1V applied to SENSEB selects an input range of ±VSENSEB. ±1V is the largest valid input range. VCMB (Pin 20): Channel B 1.5V Output and Input Common Mode Bias. Bypass to ground with 2.2 µF ceramic chip capacitor. Do not connect to VCMA. MUX (Pin 21): Digital Output Multiplexer Control. If MUX is High, Channel A comes out on DA0-DA13, OFA; Channel B comes out on DB0-DB13, OFB. If MUX is Low, the output busses are swapped and Channel A comes out on DB0- DB13, OFB; Channel B comes out on DA0-DA13, OFA. To multiplex both channels onto a single output bus, connect MUX, CLKA and CLKB together. SHDNB (Pin 22): Channel B Shutdown Mode Selection Pin. Connecting SHDNB to GND and OEB to GND results in normal operation with the outputs enabled. Connecting SHDNB to GND and OEB to VDD results in normal opera- tion with the outputs at high impedance. Connecting SHDNB to VDD and OEB to GND results in nap mode with the outputs at high impedance. Connecting SHDNB to VDD and OEB to VDD results in sleep mode with the outputs at high impedance. OEB (Pin 23): Channel B Output Enable Pin. Refer to SHDNB pin function. DB0 – DB13 (Pins 24 to 30, 33 to 39): Channel B Digital Outputs. DB13 is the MSB. OGND (Pins 31, 50): Output Driver Ground. OVDD (Pins 32, 49): Positive Supply for the Output Driv- ers. Bypass to ground with 0.1 µF ceramic chip capacitor. OFB (Pin 40): Channel B Overflow/Underflow Output. High when an overflow or underflow has occurred. DA0 – DA13 (Pins 41 to 48, 51 to 56): Channel A Digital Outputs. DA13 is the MSB. OFA (Pin 57): Channel A Overflow/Underflow Output. High when an overflow or underflow has occurred. OEA (Pin 58): Channel A Output Enable Pin. Refer to SHDNA pin function. |
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Similar Description - LTC2295 |
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