AD7994/AD7993

–8–

REV. PrF

PRELIMINARYTECHNICAL DATA

PIN FUNCTION DESCRIPTION

Pin

Mnemonic

Function

AGND

Analog Ground. Ground reference point for all circuitry on the AD7994/AD7993. All analog

input signals should be referred to this GND voltage.

Voltage Reference Input. The External Reference for the AD7994/AD7993 should 0.1 µF

A S

Logic Input. Address Select Input which selects one of three I

AD7993 as shown in Table I.

CONVST

Logic Input Signal. Convert Start Signal. This is an edge triggered logic input. The rising

edge of this signal powers up the part. The power up time for the part is 1

µs. The falling

edge of

CONVST places the track/hold into hold mode and initiates a conversion. A power

up time of at least 1

µs must be allowed for the CONVST high pulse, otherwise the conver-

sion result will be invalid. (See Modes of Operation Section)

ALERT/BUSY

Digital Output, selectable as an ALERT or BUSY output function. When configured as an

ALERT output, this pin acts as an Out of Range Indicator, and if enabled becomes active

section. When configured as a BUSY output, this pin becomes active when a conversion is in

progress.

S D A

Digital I/O. Serial Bus Bi-directional Data. Open-drain output. External pull-up resistor

required.

S C L

Digital Input. Serial Bus Clock. External pull-up resistor required.

AD7994/AD7993 PIN CONFIGURATION TSSOP

AD7994

TOP VIEW

1

2

3

4

13

14

15

16

CONVST

SDA

SCL

VDD

AGND

VIN4

5

(Not to Scale)

ALERT

12

AGND

11

AS

10

9

AGND

REFIN

6

VIN1

7

VIN3

8

AGND

AGND

VIN2