AD7939

更新时间： 2024-11-26 22:49:59

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器
页数	文件大小	规格书
32页	1232K
描述
8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

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数据手册

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AD7939 数据手册

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

Parallel ADCs with a Sequencer

Preliminary Technical Data

AD7938/AD7939

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Fast throughput rate: 1.5 MSPS

Specified for V_DDof 2.7 V to 5.25 V

Low power

AGND

AD7938/AD7939

REFIN/

REFOUT

2.5V

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

VREF

CLKIN

12-/10-BIT

SAR ADC

AND

I/P

CONVST

T/H

MUX

CONTROL

BUSY

SEQUENCER

PARALLEL INTERFACE/CONTROL REGISTER

DRIVE

70 dB SNR at 50 kHz input frequency

No pipeline delays

DB0 DB11

CS RD WR W/B

DGND

High speed parallel interface—word/byte modes

Full shutdown mode: 1 µA max

32-lead LFCSP and TQFP package

Figure 1.

conversion. Alternatively, this pin can be overdriven to provide

an external reference.

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.

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.

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.

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 V_DRIVEfunction. The V_DRIVE

function allows the parallel interface to connect directly to

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

and the conversion is also initiated at

CONVST

this point.

3 V, or 5 V processor systems independent of V_DD

6. No pipeline delay.

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

7. Accurate control of the sampling instant via a

CONVST

input and once off conversion control.

Rev. 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

Fax: 781.326.8703

www.analog.com

12 3 4 5 6 7...32

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与AD7939相关器件

型号	品牌	获取价格	描述	数据表
AD7939_15	ADI	获取价格	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
AD7939BCP	ADI	获取价格	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
AD7939BCP	ROCHESTER	获取价格	8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, MO-220-VHHD-2, LFCSP-32
AD7939BCP-REEL	ADI	获取价格	IC 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, MO-220-VHHD-2, LFCSP-
AD7939BCP-REEL7	ROCHESTER	获取价格	8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, MO-220-VHHD-2, LFCSP-32
AD7939BCPZ	ADI	获取价格	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
AD7939BCPZ	ROCHESTER	获取价格	8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, LEAD FREE, MO-220-VHHD-2
AD7939BCPZ-REEL7	ADI	获取价格	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
AD7939BCPZ-REEL7	ROCHESTER	获取价格	8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, LEAD FREE, MO-220-VHHD-2
AD7939BSU	ADI	获取价格	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

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