REV. D

AD9057

–4–

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection. Although

the AD9057 features proprietary ESD protection circuitry, permanent damage may occur on

devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are

recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

*

Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Operating Temperature . . . . . . . . . . . . . . . . –55

∞C to +125∞C

Storage Temperature . . . . . . . . . . . . . . . . . . –65

∞C to +150∞C

Maximum Junction Temperature . . . . . . . . . . . . . . . . 150

∞C

Maximum Case Temperature . . . . . . . . . . . . . . . . . . . 150

∞C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those listed in the operational

sections of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

ORDERING GUIDE

Temperature

Model

Range

Package Option

*

AD9057BRS-40

–40

∞C to +85∞C RS-20

AD9057BRS-60

–40

∞C to +85∞C RS-20

AD9057BRS-80

–40

∞C to +85∞C RS-20

AD9057/PCB

25

∞CEvaluation Board

*RS = Shrink Small Outline Package (SSOP).

Table I. Digital Coding (VREF = 2.5 V)

Analog Input

Voltage Level

Digital Output

3.0 V

Positive Full Scale

1111 1111

2.502 V

Midscale +1/2 LSB

1000 0000

2.498 V

Midscale –1/2 LSB

0111 1111

2.0 V

Negative Full Scale

0000 0000

PIN FUNCTION DESCRIPTIONS

Pin No.

Mnemonic

Function

1

PWRDN

Power-Down Function Select;

Logic High for Power-Down

Mode (Digital Outputs Go to

High Impedance State).

2

VREF OUT

Internal Reference Output

(2.5 V typ); Bypass with 0.1

mF

to Ground.

3

VREF IN

Reference Input for ADC (2.5 V

typ,

±10%).

4, 9, 16

GND

Ground (Analog/Digital).

5, 8

Analog 5 V Power Supply.

6

BIAS OUT

Bias Pin for AC Coupling

(1 k

W to REF IN).

7

AIN

Analog Input for ADC.

10

ENCODE

Encode Clock for ADC (ADC

Samples on Rising Edge of

Encode).

11–14, 17–20

D7–D0

Digital Outputs of ADC.

15

Digital Output Power Supply;

Nominally 3 V to 5

V.

PIN CONFIGURATION

14

13

12

11

17

16

15

20

19

18

10

9

8

1

2

3

4

7

6

5

TOP VIEW

(Not to Scale)

PWRDN

D3

D2

D1

D0 (LSB)

VREF OUT

VREF IN

GND

AD9057

D4

GND

BIAS OUT

AIN

GND

ENCODE

D7 (MSB)

D6

D5