AD6640AST datasheet(5/24 Pages) AD

5 / 24 page

AD6640

REV. 0

–5–

PIN FUNCTION DESCRIPTIONS

Pin No.

Name

Function

1, 2, 36, 37, 40, 41

DVCC

+3.3 V/+5 V Power Supply (Digital). Powers output stage only.

ENCODE

Encode Input. Data conversion initiated on rising edge.

ENCODE

Complement of ENCODE. Drive differentially with ENCODE or bypass to

Ground for single-ended clock mode. See Encoding the AD6640 section.

5, 6, 13, 14, 17, 18, 21,

22, 24, 34, 35, 38, 39

GND

Ground.

AIN

Analog Input.

AIN

Complement of Analog Input.

9VREF

Internal Voltage Reference. Nominally +2.4 V. Bypass to Ground with

0.1

µF + 0.01 µF microwave chip capacitor.

Internal Bias Point. Bypass to ground with 0.01

µF capacitor.

11, 12, 15, 16, 19, 20

AVCC

+5 V Power Supply (Analog).

No Connect.

D0 (LSB)

Digital Output Bit (Least Significant Bit).

26–33

D1–D8

Digital Output Bits.

42, 43

D9–D10

Digital Output Bits.

D11 (MSB)1

Digital Output Bit (Most Significant Bit).

NOTE

1Output coded as twos complement.

PIN CONFIGURATION

40 39 38

35 34

12 13

14 15

16 17 18 19 20 21 22

PIN 1

TOP VIEW

(Not to Scale)

AD6640

DVCC

ENCODE

GND

AIN

NC = NO CONNECT

VREF

AVCC

D0 (LSB)

GND

AIN

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