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

APPLICATION INFORMATION

100000000000

011111111111

000000000010

000000000001

000000000000

111111111110

0

0.0024

2.4564

2.4576

2.4588

100000000001

111111111101

111111111111

4.9128

4.9140

4.9152

2048

2047

2

1

0

4094

2049

4093

4095

VI – Analog Input Voltage – V

VZT = VZS + 1/2 LSB

VZS

See Notes A and B

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