LTC1405IGN datasheet(7/20 Pages) LINER

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LTC1405

1405fa

PI FU CTIO S

+AIN (Pin 1): Positive Analog Input.

–AIN (Pin 2): Negative Analog Input.

VCM (Pin 3): 2.5V Reference Output.Optional input com-

mon mode for single supply operation. Bypass to GND

with a 1µF to 10µF ceramic.

SENSE (Pin 4): Reference Programming Pin. Ground

selects VREF = 4.096V. Short to VREF for 2.048V. Connect

SENSE to VDD to drive VREF with an external reference.

VREF (Pin 5): DAC Reference. Bypass to GND with a 1µF to

10µF ceramic.

GND (Pin 6): DAC Reference Ground.

VDD (Pin 7): Analog 5V Supply. Bypass to GND with a 1µF

to 10µF ceramic.

GND (Pin 8): Analog Power Ground.

D11 to D0 (Pins 9 to 20): Data Outputs. The output format

is two’s complement.

OGND (Pin 21): Output Logic Ground. Tie to GND.

OVDD (Pin 22): Positive Supply for the Output Logic.

Connect to Pin 23 for 5V logic. If not shorted to Pin 23,

bypass to GND with a 1µF ceramic.

VDD (Pin 23): Analog 5V Supply. Bypass to GND with a 1µF

ceramic.

GND (Pin 24): Analog Power Ground.

VSS (Pin 25): Negative Supply. Can be – 5V or 0V. If VSS is

not shorted to GND, bypass to GND with a 1µF ceramic.

CLK (Pin 26): Conversion Start Signal. This active high

signal starts a conversion on its rising edge.

OF (Pin 27): Overflow Output. This signal is high when the

digital output is 011111111111 or 100000000000.

GAIN (Pin 28): Gain Select for Input PGA. 5V selects an

input gain of 1, 0V selects a gain of 2.

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