REV. B

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a

10-Bit 40 MSPS

A/D Converter

AD9040A

FEATURES

Low Power: 940 mW

On-Chip T/H, Reference

CMOS-Compatible

2 V p-p Analog Input

Fully Characterized Dynamic Performance

APPLICATIONS

Ultrasound Medical Imaging

Digital Oscilloscopes

Professional Video

Digital Communications

Advanced Television (MUSE Decoders)

Instrumentation

GENERAL DESCRIPTION

The AD9040A is a complete 10-bit monolithic sampling analog-

to-digital converter (ADC) with on-board track-and-hold and

reference. The unit is designed for low cost, high performance

applications and requires only an encode signal to achieve

40 MSPS sample rates with 10-bit resolution.

Digital inputs and outputs are CMOS compatible; the analog

input requires a signal of 2 V p-p amplitude. The two-step

architecture used in the AD9040A is optimized to provide the

best dynamic performance available while maintaining low

power requirements of only 940 mW typically; maximum dissi-

pation is 1.1 watt at 40 MSPS.

The signal-to-noise ratio (SNR), including harmonics, is 53 dB,

or 8.5 ENOB, when sampling an analog input of 10.3 MHz at

40 MSPS. Competitive devices perform at less than 7.5 ENOB

and require external references and larger input signals.

The AD9040A A/D converter is available as either a 28-lead

plastic DIP or a 28-lead SOIC. The two models operate over a

commercial temperature range of 0

°C to +70°C. Contact the

factory regarding availability of ceramic military temperature

range devices.

FUNCTIONAL BLOCK DIAGRAM

ERROR

CORRECTION

AD9040A

10

BANDGAP

REFERENCE

6-BIT

ADC

5-BIT

ADC

T/H

T/H

DECODE

LOGIC

DECODE

LOGIC

ENCODE

GND

AMP

ARRAY

REF

AMP

PRODUCT HIGHLIGHTS

1. CMOS compatible logic for direct interface to ASICs.

2. On-board T/H provides excellent high frequency perfor-

mance on analog inputs, critical for communications and

medical imaging applications.

3. High input impedance and 2 volt p-p input range reduce

need for external amplifiers.

4. Easy to use; no cumbersome external voltage references

required, allowing denser packing of ADCs for multichannel

applications.

5. Available in 28-lead plastic DIP and SOIC packages.

6. Evaluation board includes AD9040AJR, reconstruction

DAC, and latches. Space is available near the analog input

and digital outputs of the converter for additional circuits.

Order as part number AD9040A/PCB (schematic shown in

data sheet).

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

Tel: 781/329-4700

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

Fax: 781/326-8703

© Analog Devices, Inc., 1999