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LTC2281IUP Datasheet(PDF) 9 Page - Linear Technology |
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LTC2281IUP Datasheet(HTML) 9 Page - Linear Technology |
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9 / 24 page  LTC2281 9 2281fb PIN FUNCTIONS OEA (Pin 58): Channel A Output Enable Pin. Refer to SHDNA pin function. SHDNA (Pin 59): Channel A Shutdown Mode Selection Pin. Connecting SHDNA to GND and OEA to GND results in normal operation with the outputs enabled. Connecting SHDNA to GND and OEA to VDD results in normal operation with the outputs at high impedance. Connecting SHDNA to VDD and OEA to GND results in nap mode with the outputs at high impedance. Connecting SHDNA to VDD and OEA to VDD results in sleep mode with the outputs at high impedance. MODE (Pin 60): Output Format and Clock Duty Cycle Stabilizer Selection Pin. Note that MODE controls both channels. Connecting MODE to GND selects offset binary output format and turns the clock duty cycle stabilizer off. 1/3 VDD selects offset binary output format and turns the clock duty cycle stabilizer on. 2/3 VDD selects 2’s complement output format and turns the clock duty cycle stabilizer on. VDD selects 2’s complement output format and turns the clock duty cycle stabilizer off. VCMA (Pin 61): Channel A 1.5V Output and Input Common Mode Bias. Bypass to ground with 2.2μF ceramic chip capacitor. Do not connect to VCMB. SENSEA (Pin 62): Channel A Reference Programming Pin. Connecting SENSEA to VCMA 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 SENSEA selects an input range of ±VSENSEA. ±1V is the largest valid input range. GND (Exposed Pad) (Pin 65): ADC Power Ground. The Exposed Pad on the bottom of the package needs to be soldered to ground. FUNCTIONAL BLOCK DIAGRAM Figure 1. Functional Block Diagram (Only One Channel is Shown) SHIFT REGISTER AND CORRECTION DIFF REF AMP REF BUF 2.2μF 1μF 1μF 0.1μF INTERNAL CLOCK SIGNALS REFH REFL CLOCK/DUTY CYCLE CONTROL RANGE SELECT 1.5V REFERENCE FIRST PIPELINED ADC STAGE FIFTH PIPELINED ADC STAGE SIXTH PIPELINED ADC STAGE FOURTH PIPELINED ADC STAGE SECOND PIPELINED ADC STAGE REFH REFL CLK OE MODE OGND OVDD 2281 F01 INPUT S/H SENSE VCM AIN – AIN + 2.2μF THIRD PIPELINED ADC STAGE OUTPUT DRIVERS CONTROL LOGIC SHDN OF* D9 D0 CLKOUT* • • • *OF AND CLKOUT ARE SHARED BETWEEN BOTH CHANNELS. |
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