Datasheet

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
V
I
– Analog Input Voltage – V
V
ZT
= V
ZS
+ 1/2 LSB
V
ZS
See Notes A and B
4.9134
0.0012
V
FT
= V
FS
– 1/2 LSB
V
FS
V
FSnom
NOTES: 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
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