AD9283

–4–

REV. B

EXPLANATION OF TEST LEVELS

Test Level

I

100% production tested.

II

100% production tested at +25

°C and sample tested at

specified temperatures.

III Sample tested only.

IV Parameter is guaranteed by design and characterization

testing.

V

Parameter is a typical value only.

VI 100% production tested at +25

°C; guaranteed by design

and characterization testing for industrial temperature

range; 100% production tested at temperature extremes for

military devices.

PIN CONFIGURATION

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

AD9283

ENCODE

GND

VREF OUT

VREF IN

GND

D7 (MSB)

D6

D5

D1

D2

D3

D4

GND

PWRDWN

D0 (LSB)

PIN FUNCTION DESCRIPTIONS

Pin Number

Name

Function

1

PWRDWN

Power-down function select; Logic HIGH for power-down mode (digital outputs go to

high impedance state).

2

VREF OUT

Internal Reference Output (+1.25 V typ); Bypass with 0.1

µF to Ground.

3

VREF IN

Reference Input for ADC (+1.25 V typ).

4, 9, 16

GND

Ground.

5, 8

Analog +3 V Power Supply.

Analog Input for ADC (Can be left open if operating in single-ended mode, but recom-

mend connection to a 0.1

µF capacitor and a 25 Ω resistor in series to ground for better

input matching).

Analog Input for ADC

10

ENCODE

Encode Clock for ADC (ADC samples on rising edge of ENCODE).

11–14, 17–20

D7–D4, D3–D0

Digital Outputs of ADC.

15

Digital output power supply. Nominally +2.5 V to +3.6 V.

Table I. Output Coding (VREF = +1.25 V)

Step

Digital Output

255

0.512

1111 1111

•

•

•

•

•

•

128

0.002

1000 0000

127

–0.002

0111 1111

•

•

•

•

•

•

0

–0.512

0000 0000