ADC10321

10-Bit, 20MSPS, 98mW A/D Converter with Internal

Sample and Hold

General Description

The ADC10321 is a low power, high performance CMOS

analog-to-digital converter that digitizes signals to 10 bits

resolution at sampling rates up to 25Msps while consuming

a typical 98mW from a single 5V supply. Reference force

and sense pins allow the user to connect an external refer-

ence buffer amplifier to ensure optimal accuracy. No missing

codes is guaranteed over the full operating temperature

range. The unique two stage architecture achieves 9.2 Effec-

tive Bits with a 10MHz input signal and a 20MHz clock fre-

quency. Output formatting is straight binary coding.

To ease interfacing to 3V systems, the digital I/O power pins

of the ADC10321 can be tied to a 3V power source, making

the outputs 3V compatible. When not converting, power con-

sumption can be reduced by pulling the PD (Power Down)

pin high, placing the converter into a low power standby

state, where it typically consumes less than 4mW. The

ADC10321’s speed, resolution and single supply operation

makes it well suited for a variety of applications in video, im-

aging, communications, multimedia and high speed data ac-

quisition. Low power, single supply operation ideally suit the

ADC10321 for high speed portable applications, and its

speed and resolution are ideal for charge coupled device

(CCD) input systems.

The ADC10321 comes in a space saving 32-pin TQFP and

operates over the industrial (−40˚C

≤ T

ture range.

Features

n

Internal Sample-and-Hold

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Single +5V Operation

n

Low Power Standby Mode

n

Guaranteed No Missing Codes

n

Tri-State Outputs

n

TTL/CMOS or 3V Logic Input/Output Compatible

Key Specifications

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Resolution

10 Bits

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Conversion Rate

20 Msps

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ENOB 10MHz Input

9.2 Bits (typ)

n

DNL

0.35 LSB (typ)

n

Conversion Latency

2 Clock Cycles

n

PSRR

56dB

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Power Consumption

98mW (typ)

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Low Power Standby Mode

Applications

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Digital Video

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Communications

n

Document Scanners

n

Medical Imaging

n

Electro-Optics

n

Plain Paper Copiers

n

CCD Imaging

Connection Diagram

DS100897-1

January 2000

© 2000 National Semiconductor Corporation

DS100897

www.national.com