AD7938BSU-6REEL7 datasheet(1/32 Pages) AD

Teilenummer	AD7938BSU-6REEL7

Bauteilbeschribung	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer

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8-Channel, 625 kSPS, 12-Bit

Parallel ADCs with a Sequencer

AD7938-6

Rev. 0

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

FEATURES

Fast throughput rate: 625 kSPS

Specified for VDD of 2.7 V to 5.25 V

Low power

3.6 mW max at 625 kSPS with 3 V supplies

7.5 mW max at 625 kSPS 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

±0.2% max @ 25°C, 25 ppm/°C max

70 dB SINAD at 50 kHz input frequency

No pipeline delays

High speed parallel interface—word/byte modes

Full shutdown mode: 2 µA max

32-lead LFCSP and TQFP package

FUNCTIONAL BLOCK DIAGRAM

VIN7

T/H

PARALLEL INTERFACE/CONTROL REGISTER

SEQUENCER

12-BIT

SAR ADC

AND

CONTROL

I/P

MUX

2.5V

VREF

DB0

DB11

VDRIVE

VDD

AD7938-6

VIN0

AGND

VREFIN/

VREFOUT

CLKIN

BUSY

CONVST

CS

DGND

RD WR W/B

Figure 1.

GENERAL DESCRIPTION

The AD7938-6 is a 12-bit high speed, low power, successive

approximation (SAR) ADC. The part operates from a single

2.7 V to 5.25 V power supply and features throughput rates up

to 625 kSPS. The part contains a low noise, wide bandwidth,

differential track-and-hold amplifier that can handle input

frequencies up to 50 MHz.

The AD7938-6 features eight analog input channels with a

channel sequencer that allows a preprogrammed selection of

channels to be converted sequentially. The part 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 AD7938-6 has 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.

The AD7938-6 uses advanced design techniques to achieve very

low power dissipation at high throughput rates. The part also

features 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.

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