ADC12L034 datasheet(26/35 Pages) NSC

26 / 35 page

Application Information (Continued)

the voltages on the V

REF

+ and V

REF

− pins determines the

input voltage span (V

REF). The analog input voltage range is

0toV

+. Negative digital output codes result when V

−

+. The actual voltage at V

− or V

+ cannot go below

AGND.

CH0, CH2, CH4, and CH6 can be assigned to the MUX-

OUT1 pin in the differential configuration, while CH1, CH3,

CH5, and CH7 can be assigned to the MUXOUT2 pin. In the

differential configuration, the analog inputs are paired as

follows: CH0 with CH1, CH2 with CH3, CH4 with CH5 and

CH6 with CH7. The A/DIN1 and A/DIN2 pins can be as-

signed positive or negative polarity.

With the single-ended multiplexer configuration CH0 through

CH7 can be assigned to the MUXOUT1 pin. The COM pin is

always assigned to the MUXOUT2 pin. A/DIN1 is assigned

as the positive input; A/DIN2 is assigned as the negative

input. (See Figure 10 ).

The Multiplexer assignment tables for the ADC12L030,2,4,8

(Tables 2, 3, 4) summarize the aforementioned functions for

the different versions of A/Ds.

4 Differential Channels

8 Single-Ended Channels with

COM as Zero Reference

01183038

01183039

FIGURE 9.

Differential Configuration

Single-Ended Configuration

01183040

A/DIN1 and A/DIN2 can be assigned as the + or − input

01183041

A/DIN1 is + input

A/DIN2 is − input

FIGURE 10.

ADC12L034 데이터시트(PDF) 26 Page - National Semiconductor (TI)

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