AD7938_15 datasheet(1/36 Pages) AD

Teilenummer	AD7938

Bauteilbeschribung	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

Data Sheet

AD7938/AD7939

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

FEATURES

Throughput rate: 1.5 MSPS

Specified for VDD of 2.7 V to 5.25 V

Power consumption

6 mW maximum at 1.5 MSPS with 3 V supplies

13.5 mW maximum 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

±0.2% maximum @ 25°C, 25 ppm/°C maximum

69 dB SINAD at 50 kHz input frequency

No pipeline delays

High speed parallel interface—word/byte modes

Full shutdown mode: 2 µA maximum

32-lead LFCSP and TQFP packages

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) analog-to-digital

converters (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 50 MHz.

The AD7938/AD7939 feature eight analog input channels with

a channel sequencer that allows 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. 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.

Table 1. Related Devices

Device

No. of Bits

No. of Channels

Speed

AD7933/AD7934

12/10

4

1.5 MSPS

AD7938-6

12

8

625 kSPS

AD7934-6

12

4

625 kSPS

Ähnliche Beschreibung - AD7938_15

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
Analog Devices	AD7938	1Mb / 32P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer Rev.PrN
	AD7938BSUZ	561Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer REV. C
	AD7938	629Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
	AD7939	561Kb / 36P	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer REV. C
	AD7933	1Mb / 32P	4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer Rev.PrG
	AD7934	768Kb / 32P	4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer REV. B
	AD7934BRUZ-REEL7	768Kb / 32P	4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer REV. B
	AD7933	768Kb / 32P	4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer REV. B
	AD7938-6	819Kb / 33P	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
	AD7938-6	762Kb / 32P	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer REV. 0

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