LTC1743_15 datasheet(9/24 Pages) LINER

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LTC1743

1743f

SENSE (Pin 1): Reference Sense Pin. Ground selects

±1V. VDD selects ±1.6V. Greater than 1V and less than

1.6V applied to the SENSE pin selects an input range of

±VSENSE, ±1.6V is the largest valid input range.

VCM (Pin 2): 2.5V Output and Input Common Mode Bias.

Bypass to ground with 4.7

µF ceramic chip capacitor.

GND (Pins 3, 6, 9, 12, 13, 16, 19, 21, 36, 37): ADC

Power Ground.

AIN+ (Pin 4): Positive Differential Analog Input.

AIN– (Pin 5): Negative Differential Analog Input.

VDD (Pins 7, 8, 17, 18, 20): 5V Supply. Bypass to AGND

with 1

µF ceramic chip capacitor.

REFLB (Pin 10): ADC Low Reference. Bypass to Pin 11

with 0.1

µF ceramic chip capacitor. Do not connect to

Pin 14.

REFHA (Pin 11): ADC High Reference. Bypass to Pin 10

with 0.1

µF ceramic chip capacitor, to Pin 14 with a 4.7µF

ceramic capacitor and to ground with 1

µF ceramic

capacitor.

REFLA (Pin 14): ADC Low Reference. Bypass to Pin 15

with 0.1

µF ceramic chip capacitor, to Pin 11 with a 4.7µF

ceramic capacitor and to ground with 1

µF ceramic

capacitor.

REFHB (Pin 15): ADC High Reference. Bypass to Pin 14

with 0.1

µF ceramic chip capacitor. Do not connect to

Pin 11.

PI FU CTIO S

MSBINV (Pin 22): MSB Inversion Control. Low inverts

the MSB, 2’s complement output format. High does not

invert the MSB, offset binary output format.

ENC (Pin 23): Encode Input. The input sample starts on

the positive edge.

ENC (Pin 24): Encode Complement Input. Conversion

starts on the negative edge. Bypass to ground with 0.1

µF

ceramic for single-ended encode signal.

OE (Pin 25): Output Enable. Low enables outputs. Logic

high makes outputs Hi-Z.

CLKOUT (Pin 26): Data Valid Output. Latch data on the

rising edge of CLKOUT.

OGND (Pins 27, 38, 47): Output Driver Ground.

NC (Pins 28, 29): Do not connect these pins.

D0-D1 (Pins 30 to 31): Digital Outputs. D0 is the LSB.

OVDD (Pins 32, 43): Positive Supply for the Output Driv-

ers. Bypass to ground with 0.1

µF ceramic chip capacitor.

D2-D4 (Pins 33 to 35): Digital Outputs.

D5-D8 (Pins 39 to 42): Digital Outputs.

D9-D11 (Pins 44 to 46): Digital Outputs. D11 is the MSB.

OF (Pin 48): Over/Under Flow Output. High when an over

or under flow has occurred.

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