TLC2543C, TLC2543I, TLC2543M
12-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS079F – DECEMBER 1993 – REVISED NOVEMBER 2001
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
100000000000
011111111111
000000000010
000000000001
000000000000
111111111110
0
0.0024
2.4564
2.4576
2.4588
Digital
Output
Code
100000000001
111111111101
111111111111
4.9128
4.9140
4.9152
2048
2047
2
1
0
4094
Step
2049
4093
4095
0.0006
VI – Analog Input Voltage – V
VZT = VZS + 1/2 LSB
VZS
See Notes A and B
4.9134
0.0012
VFT = VFS – 1/2 LSB
VFS
VFSnom
NOTES: A. This curve is based on the assumption that Vref+ and Vref – have been adjusted so that the voltage at the transition from digital 0
to 1 (VZT) is 0.0006 V and the transition to full scale (VFT) is 4.9134 V. 1 LSB = 1.2 mV.
B. The full-scale value (VFS) is the step whose nominal midstep value has the highest absolute value. The zero-scale value (VZS) is
the step whose nominal midstep value equals zero.
Figure 16. Ideal Conversion Characteristics
Processor
Control
Circuit
Analog
Inputs
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
AIN10
I/O CLOCK
CS
DATA INPUT
DATA OUT
EOC
REF+
REF–
GND
TLC2543
To Source
Ground
5-V DC Regulated
1
2
3
4
5
6
7
8
9
11
12
15
18
17
16
19
14
13
10
Figure 17. Serial Interface