AD7939BSU datasheet(1/32 Pages) AD

Il numero della parte	AD7939BSU

Spiegazioni elettronici	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

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8-Channel, 1.5 MSPS, 12-Bit and 10-Bit

Parallel ADCs with a Sequencer

Preliminary Technical Data

AD7938/AD7939

FEATURES

Fast throughput rate: 1.5 MSPS

Specified for VDD of 2.7 V to 5.25 V

Low power

8 mW max at 1.5 MSPS with 3 V supplies

16 mW max at 1.5 MSPS with 5 V supplies

8 analog input channels with a sequencer

Software configurable analog inputs

8-channel single-ended inputs

4-channel fully differential inputs

4-channel pseudo-differential inputs

7-channel pseudo-differential inputs

Accurate on-chip 2.5 V reference

Wide input bandwidth

70 dB SNR at 50 kHz input frequency

No pipeline delays

High speed parallel interface—word/byte modes

Full shutdown mode: 1 µA max

32-lead LFCSP and TQFP package

FUNCTIONAL BLOCK DIAGRAM

VIN7

T/H

PARALLEL INTERFACE/CONTROL REGISTER

SEQUENCER

12-/10-BIT

SAR ADC

AND

CONTROL

I/P

MUX

2.5V

VREF

DB0 DB11

VDRIVE

VDD

AD7938/AD7939

VIN0

AGND

VREFIN/

VREFOUT

CLKIN

BUSY

CONVST

CS

DGND

RD WR W/B

Figure 1.

GENERAL DESCRIPTION

The AD7938/AD7939 are 12-bit and 10-bit, high speed, low

power, successive approximation (SAR) ADCs. The parts

operate from a single 2.7 V to 5.25 V power supply and feature

throughput rates up to 1.5 MSPS. The parts contain a low noise,

wide bandwidth, differential track-and-hold amplifier that can

handle input frequencies up to 20 MHz.

The AD7938/AD7939 feature eight analog input channels with

a channel sequencer that allow a preprogrammed selection of

channels to be converted sequentially. These parts can operate

with either single-ended, fully differential, or pseudo-

differential analog inputs.

The conversion process and data acquisition are controlled

using standard control inputs that allow easy interfacing with

microprocessors and DSPs. The input signal is sampled on the

falling edge of CONVST and the conversion is also initiated at

this point.

The AD7938/AD7939 have an accurate on-chip 2.5 V reference

that can be used as the reference source for the analog-to-digital

conversion. Alternatively, this pin can be overdriven to provide

an external reference.

These parts use advanced design techniques to achieve very low

power dissipation at high throughput rates. They also feature

flexible power management options. An on-chip control register

allows the user to set up different operating conditions,

including analog input range and configuration, output coding,

power management, and channel sequencing.

PRODUCT HIGHLIGHTS

1.

High throughput with low power consumption.

2.

Eight analog inputs with a channel sequencer.

3.

Accurate on-chip 2.5 V reference.

4.

Software configurable analog inputs. Single-ended, pseudo-

differential, or fully differential analog inputs that are

software selectable.

5.

Single-supply operation with VDRIVE function. The VDRIVE

function allows the parallel interface to connect directly to

3 V, or 5 V processor systems independent of VDD.

6.

No pipeline delay.

7.

Accurate control of the sampling instant via a CONVST

input and once off conversion control.

PrN

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.326.8703

Rev.

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