ADC12C080 datasheet(3/33 Pages) TI2

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AGND

ADC12C080

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SNAS379C – SEPTEMBER 2006 – REVISED APRIL 2013

Pin Descriptions and Equivalent Circuits

Pin No.

Symbol

Equivalent Circuit

Description

ANALOG I/O

VIN+

Differential analog input pins. The differential full-scale input signal

level is 2VP-P with each input pin signal centered on a common mode

VIN-

voltage, VCM.

VRP

VCMO

These pins should each be bypassed to AGND with a low ESL

(equivalent series inductance) 0.1 µF capacitor placed very close to

the pin to minimize stray inductance. A 0.1 µF capacitor should be

placed between VRP and VRN as close to the pins as possible, and a

1 µF capacitor should be placed in parallel.

VRP and VRN should not be loaded. VCMO may be loaded to 1mA for

VRN

use as a temperature stable 1.5V reference.

It is recommended to use VCMO to provide the common mode

voltage, VCM, for the differential analog inputs, VIN+ and VIN−.

Reference Voltage. This device provides an internally developed

1.2V reference. When using the internal reference, VREF should be

decoupled to AGND with a 0.1 µFand a 1 µF low equivalent series

VREF

inductance (ESL) capacitor.

This pin may be driven with an external 1.2V reference voltage.

This pin should not be used to source or sink current.

This is a four-state pin controlling the input clock mode and output

data format.

OF/DCS = VA, output data format is 2's complement without duty

cycle stabilization applied to the input clock

OF/DCS = AGND, output data format is offset binary, without duty

OF/DCS

cycle stabilization applied to the input clock.

OF/DCS = (2/3)*VA, output data is 2's complement with duty cycle

stabilization applied to the input clock

OF/DCS = (1/3)*VA, output data is offset binary with duty cycle

stabilization applied to the input clock.

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