Contents

1.

GENERAL DESCRIPTION ......................................................................................................................... 4

2.

FEATURES................................................................................................................................................. 4

3.

APPLICATIONS ......................................................................................................................................... 4

4.

ORDERING INFORMATION....................................................................................................................... 4

5.

PIN CONFIGURATION ............................................................................................................................... 4

6.

PIN DESCRIPTION .................................................................................................................................... 5

7.

FUNCTIONAL BLOCK DIAGRAM ............................................................................................................. 5

8.

TYPICAL APPLICATION CIRCUIT ............................................................................................................ 6

9.

ABSOLUTE MAXIMUM RATINGS ............................................................................................................. 6

10. ELECTRICAL CHARACTERISTICS .......................................................................................................... 7

11. FUNCTION DESCRIPTION ........................................................................................................................ 8

11.1

Microprocessor Interface ............................................................................................................. 8

11.2

Power System................................................................................................................................ 8

11.2.1 Analog power (VDD, VSSA) and Digital power (VCC, VSS) ........................................... 8

11.2.2 Switch-able Power Output................................................................................................ 8

11.2.3 AGND Generator ............................................................................................................... 9

11.2.4 Bandgap Voltage Reference and Temperature sensor................................................... 9

11.2.5 Bias Current Source Generator ....................................................................................... 9

11.3

Clock Generator .......................................................................................................................... 10

11.4

Function Network........................................................................................................................ 10

11.4.1 Analog Multiplex: ............................................................................................................ 11

11.4.2 OPAMP ............................................................................................................................. 11

11.4.3 The Operation of the Delta-Sigma (

) Modulator ADC ............................................... 11

12. APPLICATION SAMPLE .......................................................................................................................... 15

13. PACKAGE INFORMATION ...................................................................................................................... 17

13.1

Package Outline, DIP20 .............................................................................................................. 17

13.2

Package Outline, SOP20............................................................................................................. 17

14. REVISION HISTORY ................................................................................................................................ 18