AD9020

–5–

REV. C

PIN FUNCTION DESCRIPTIONS

Pin No.

Name

Function

1

Midpoint of internal reference ladder.

2, 16, 28, 29, 35, 41, 42,

Negative supply voltage; nominally –5.0 V

± 5%.

54, 64

3, 6, 15, 18, 25, 30, 33, 34,

Positive supply voltage; nominally 5 V

± 5%.

37, 40, 45, 52, 55, 65, 68

4, 5, 13, 17, 27, 31, 32,

GROUND

All ground pins should be connected together and to low impedance ground

36, 38, 39, 43, 53, 66, 67

plane.

7

Three-quarter point of internal reference ladder.

8, 9

ANALOG IN

Analog input; nominally between

±1.75 V.

11

Voltage sense line to most positive point on internal resistor ladder.

Normally 1.75 V.

12

Voltage force connection for top of internal reference ladder. Normally driven

14

ENCODE

TTL-compatible convert command used to begin digitizing process.

19–23, 46–50

TTL-compatible digital output data.

51

OVERFLOW

56

Voltage force connection for bottom of internal reference ladder. Normally

57

Voltage sense line to most negative point on internal resistor ladder.

Normally –1.75 V.

59

LSBs INVERT

inverted.

61

MSB INVERT

is inverted.

63

One-quarter point of internal reference ladder.

PIN CONFIGURATION

LSBs INVERT

OVERFLOW

NC

NC

NC

GND

GND

NC

ENCODE

GND

NC

NC

NC = NO CONNECT

AD9020

TOP VIEW

(NOT TO SCALE)

9

61

60

10

26

27

43

44