adc12l032 National Semiconductor Corporation, adc12l032 Datasheet - Page 26

• Manufacturer Part Number: adc12l032
• Description: 3.3v Self-calibrating 12-bit Plus Sign Serial I/o A/d Converters With Mux And Sample/hold
• Manufacturer: National Semiconductor Corporation

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Application Information
the voltages on the V
input voltage span (V
0 to V
V
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
A/DIN1 and A/DIN2 can be assigned as the + or − input
IN
+
. The actual voltage at V
A
+
. Negative digital output codes result when V
Differential Configuration
4 Differential Channels
REF
REF
). The analog input voltage range is
+
and V
IN
−
01183038
REF
or V
−
01183040
IN
pins determines the
+
(Continued)
cannot go below
IN
−
FIGURE 10.
FIGURE 9.
>
26
A/DIN1 is + input
A/DIN2 is − input
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.
8 Single-Ended Channels with
Single-Ended Configuration
COM as Zero Reference
01183039
01183041