Pin Configuration

01502901

Ordering Information

CLC5957MTD

48-Pin TSSOP

CLC5957MTDX

48-Pin TSSOP (Taped

Reel)

CLC5957PCASM

Evaluation Board

Pin Descriptions

Pin

Name

Pin

No.

Description

A

IN

A

IN

13, 14

Differential input with a common mode voltage of +2.4V. The ADC

full scale input is 1.024 V

signals.

ENCODE

ENCODE

9, 10

Differential clock where ENCODE initiates a new data conversion

cycle on each rising edge. Logic for these inputs are a 50% duty

internally biased to V

V

CM

21

Internal common mode voltage reference. Nominally +2.4V. Can be

used for the input common mode voltage. This voltage is derived

from an internal bandgap reference. V

driving any external load. Failure to buffer this signal can cause

errors in the internal bias currents.

D0–D11

30–34,

39–45

Digital data outputs are CMOS and TTL compatible. D0 is the LSB

and D11 is the MSB. MSB is inverted. Output coding is two’s

complement. Current limited to source/sink 2.5mA typical.

GND

1–4, 8, 11, 12, 15, 19,

20, 23–26, 35, 36, 47, 48

Circuit ground.

+AV

CC

5–7, 16–18, 22

+5V power supply for the analog section. Bypass to ground with a

0.1 µF capacitor.

+DV

CC

37, 38, 46

+5V power supply for the digital section. Bypass to ground with a

0.1 µF capacitor.

NC

29

No connect. May be left open or grounded.

DAV

27

Data Valid Clock. Data is valid on rising edge. Current limited to

source/sink 5mA typical.

OUTLEV

28

Output Logic 3.3V or 2.5V option. Open = 3.3V, GND = 2.5V.

www.national.com

2