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otherwise under any patent or patent rights of Analog Devices.

a

12-Bit, 3.3 V Sampling ADC

AD7883

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

Tel: 617/329-4700

Fax: 617/326-8703

FUNCTIONAL BLOCK DIAGRAM

+

–

SAMPLING

COMPARATOR

CONTROL

LOGIC

SAR +

COUNTER

CLKIN

CS

CONVST

RD

BUSY

MODE

LOW POWER

CONTROL

CIRCUIT

AGND

DGND

DB0

DB11

12-BIT DAC

AD7883

THREE

STATE

BUFFERS

FEATURES

Battery-Compatible Supply Voltage: Guaranteed Specs

12-Bit Monolithic A/D Converter

50 kHz Throughput Rate

15

s Conversion Time

5

s On-Chip Track/Hold Amplifier

Low Power

Power Save Mode: 1 mW typ

Normal Operation: 8 mW typ

70 dB SNR

Small 24-Lead SOIC and 0.3" DIP Packages

APPLICATIONS

Battery Powered Portable Systems

Laptop Computers

GENERAL DESCRIPTION

The AD7883 is a high speed, low power, 12-bit A/D converter

which operates from a single +3 V to +3.6 V supply. It consists

of a 5

µs track/hold amplifier, a 15 µs successive-approximation

ADC, versatile interface logic and a multiple-input-range circuit.

The part also includes a power save feature.

Fast bus access times and standard control inputs ensure easy

interfacing to modern microprocessors and digital signal

processors.

The AD7883 features a total throughput time of 20

µs and can

convert full power signals up to 25 kHz with a sampling fre-

quency of 50 kHz.

In addition to the traditional dc accuracy specifications such as

linearity, full-scale and offset errors, the AD7883 is also fully

specified for dynamic performance parameters including har-

monic distortion and signal-to-noise ratio.

The AD7883 is fabricated in Analog Devices’ Linear Com-

patible CMOS (LC

that combines precision bipolar circuits with low power CMOS

logic. The part is available in a 24-pin, 0.3 inch-wide, plastic

dual-in-line package (DIP) as well as a small 24-lead SOIC

package.

PRODUCT HIGHLIGHTS

1. 3 V Operation

The AD7883 is guaranteed and tested with a supply voltage

of 3 V to 3.6 V. This makes it ideal for battery-powered ap-

plications where 12-bit A/D conversion is required.

2. Fast Conversion Time

15

µs conversion time and 5 µs acquisition time allow for

large input signal bandwidth. This performance is ideally

suited for applications in areas such as telecommunications,

audio, sonar and radar signal processing.

3. Low Power Consumption

1 mW power consumption in the power-down mode makes

the part ideally suited for portable, hand held, battery pow-

ered applications.