REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

8-Bit

40 MSPS/60 MSPS/80 MSPS A/D Converter

AD9057

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

© Analog Devices, Inc., 1997

FUNCTIONAL BLOCK DIAGRAM

ADC

T/H

8

D7–D0

ENCODE

AIN

VREF OUT

BIAS OUT

PWRDN

AD9057

VREF IN

+2.5V

1k

Ω

GND

PRODUCT DESCRIPTION

The AD9057 is an 8-bit monolithic analog-to-digital converter

optimized for low cost, low power, small size, and ease of use.

With a 40 MSPS, 60 MSPS or 80 MSPS encode rates capabil-

ity and full-power analog bandwidth of 120 MHz, the compo-

nent is ideal for applications requiring excellent dynamic

performance.

To minimize system cost and power dissipation, the AD9057

includes an internal +2.5 V reference and a track-and-hold

circuit. The user must provide only a +5 V power supply and an

encode clock. No external reference or driver components are

required for many applications.

The AD9057’s encode input is TTL/CMOS compatible and the

8-bit digital outputs can be operated from +5 V or +3 V supplies.

A power-down function may be exercised to bring total con-

sumption to < 10 mW. In power-down mode the digital outputs

are driven to a high impedance state.

Fabricated on an advanced BiCMOS process, the AD9057 is

available in a space saving 20-lead surface mount plastic pack-

age (20 SSOP) and is specified over the industrial (–40

°C to

+85

°C) temperature range.

Customers desiring multichannel digitization may consider the

AD9059, a dual 8-bit, 60 MSPS monolithic based on the

AD9057 ADC core. The AD9059 is available in a 28-lead sur-

face mount plastic package (28 SSOP) and is specified over the

industrial temperature range.

FEATURES

8-Bit, Low Power ADC: 200 mW Typical

120 MHz Analog Bandwidth

On-Chip +2.5 V Reference and T/H

1 V p-p Analog Input Range

Single +5 V Supply Operation

+5 V or +3 V Logic Interface

Power-Down Mode: < 10 mW

Three Performance Grades (40 MSPS, 60 MSPS, 80 MSPS)

APPLICATIONS

Digital Communications (QAM Demodulators)

RGB & YC/Composite Video Processing

Digital Data Storage Read Channels

Medical Imaging

Digital Instrumentation

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