ADS7800AH datasheet(4/21 Pages) TI1

Part #	ADS7800AH

Description	12-Bit 3關s Sampling ANALOG-TO-DIGITAL CONVERTER

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Manufacturer	TI1 [Texas Instruments]

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ADS7800

4

SBAS001A

www.ti.com

PIN ASSIGNMENTS

PIN #

NAME

DESCRIPTION

1IN1

±10V Analog Input. Connected to GND for ±5V range.

2IN2

±5V Analog Input. Connected to GND for ±10V range.

3

REF

+2V Reference Output. Bypass to GND with 22

µF to

47

µF Tantalum. Buffer for external loads.

4

AGND

Analog Ground. Connect to pin 13.

5

D11

Data Bit 11. Most Significant Bit (MSB).

6

D10

Data Bit 10.

7

D9

Data Bit 9.

8

D8

Data Bit 8.

9

D7

Data Bit 7 if HBE is LOW; LOW if HBE is HIGH.

10

D6

Data Bit 6 if HBE is LOW; LOW if HBE is HIGH.

11

D5

Data Bit 5 if HBE is LOW; LOW if HBE is HIGH.

12

D4

Data Bit 4 if HBE is LOW; LOW if HBE is HIGH.

13

DGND

Digital Ground. Connect to pin 4.

14

D3

Data Bit 3 if HBE is LOW; Data Bit 11 if HBE is HIGH.

15

D2

Data Bit 2 if HBE is LOW; Data Bit 10 if HBE is HIGH.

16

D1

Data Bit 1 if HBE is LOW; Data Bit 9 if HBE is HIGH.

17

D0

Data Bit 0 if HBE is LOW. Least Significant Bit (LSB);

Data Bit 8 if HBE is HIGH.

18

HBE

High Byte Enable. When held LOW, data output as 12

bits in parallel. When held HIGH, four MSBs presented on

pins 14-17, pins 9-12 output LOWs. Must be LOW to

initiate conversion.

19

R/C

Read/Convert. Falling edge initiates conversion when CS

is LOW, HBE is LOW, and BUSY is HIGH.

20

CS

Chip Select. Outputs in Hi-Z state when HIGH. Must be

LOW to initiate conversion or read data.

21

BUSY

Busy. Output LOW during conversion. Data valid on rising

edge in Convert Mode.

22

–VS

Negative Power Supply. –12V or –15V. Bypass to GND.

23

VSD

Positive Digital Power Supply. +5V. Connect to pin 24,

and bypass to GND.

24

VSA

Positive Analog Power Supply. +5V. Connect to pin 23,

and bypass to GND.

PIN CONFIGURATION

Top View

DIP/SOIC

1

2

3

4

5

6

7

8

9

10

11

12

IN1

IN2

REF

AGND

D11

D10

D9

D8

D7

D6

D5

D4

24

23

22

21

20

19

18

17

16

15

14

13

V

–V

BUSY

CS

R/C

HBE

D0

D1

D2

D3

DGND

SA

SD

S

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