ADC08032 datasheet(11/24 Pages) NSC

11 / 24 page

Functional Description (Continued)

enabled and whether this input is single-ended or differential.

Differential inputs are restricted to adjacent channel pairs.

For example, channel 0 and channel 1 may be selected as a

differential pair but channel 0 or 1 cannot act differentially

with any other channel. In addition to selecting differential

mode the polarity may also be selected. Channel 0 may be

selected as the positive input and channel 1 as the negative

input or vice versa. This programmability is best illustrated by

the MUX addressing codes shown in the following tables for

the various product options.

The MUX address is shifted into the converter via the DI line.

Because the ADC08031 contains only one differential input

channel with a fixed polarity assignment, it does not require

addressing.

The common input line (COM) on the ADC08038 can be

used as a pseudo-differential input. In this mode the voltage

on this pin is treated as the “−” input for any of the other input

channels. This voltage does not have to be analog ground; it

can be any reference potential which is common to all of the

inputs. This feature is most useful in single-supply applica-

tions where the analog circuity may be biased up to a poten-

tial other than ground and the output signals are all referred

to this potential.

TABLE 1. Multiplexer/Package Options

Part

Number

Number of Analog

Channels

Number of

Package

Pins

Single-Ended

Differential

ADC08031

ADC08032

ADC08034

ADC08038

TABLE 2. MUX Addressing: ADC08038

Single-Ended MUX Mode

MUX Address

Analog Single-Ended Channel #

START

SGL/

ODD/

SELECT

01234567

COM

DIF

SIGN

−

TABLE 3. MUX Addressing: ADC08038

Differential MUX Mode

MUX Address

Analog Differential Channel-Pair #

START

SGL/

ODD/

SELECT

0123

DIF

SIGN

1001234567

−

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