TLC2543-EP Datasheet, PDF (20/25 Pages) Texas Instruments – 12-BIT ANALOG-TO-DIGITAL CONVERTER WITH SERIAL CONTROL AND 11 ANALOG INPUTS

TLC2543-EP
12-BIT ANALOG-TO-DIGITAL CONVERTER
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SGLS125A – JULY 2002 – REVISED NOVEMBER 2006
APPLICATION INFORMATION
111111111111
See Notes A and B
V_FS
111111111110
111111111101
www.ti.com
4095
V_FSnom
4094
4093
100000000001
100000000000
011111111111
V_ZS
V_ZT = V_ZS + 1/2 LSB
V_FT = V_FS − 1/2 LSB
2049
2048
2047
000000000010
2
000000000001
1
000000000000
0
0.0012 0.0024
2.4564 2.4576 2.4588
0
4.9128 4.9140 4.9152
V_I − Analog Input Voltage − V
A. This curve is based on the assumption that V_ref+ and V_ref– have been adjusted so that the voltage at the transition
from digital 0 to 1 (V_ZT) is 0.0006 V and the transition to full scale (V_FT) is 4.9134 V. 1 LSB = 1.2 mV.
B. The full-scale value (V_FS) is the step whose nominal midstep value has the highest absolute value. The zero-scale
value (V_ZS) is the step whose nominal midstep value equals zero.
Figure 16. Ideal Conversion Characteristics
Analog
Inputs
To Source
Ground
TLC2543
15
1 _AIN0
CS
2 _AIN1
18
I/O CLOCK
3
AIN2
DATA INPUT ¹⁷
4 _AIN3
5 _AIN4
16
DATA OUT
6 _AIN5
7
AIN6
19
EOC
8 _AIN7
9 _AIN8
14
11 _AIN9
12 _AIN10
REF+
REF− ¹³
GND
10
Processor
5-V DC Regulated
Figure 17. Serial Interface
Control
Circuit
20
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