Datasheet > AD7938_15

AD7938_15

更新时间： 2024-01-30 04:31:23

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
36页	561K
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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AD7938_15 数据手册

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

Parallel ADCs with a Sequencer

Data Sheet

AD7938/AD7939

FEATURES

FUNCTIONAL BLOCK DIAGRAM

AGND

Throughput rate: 1.5 MSPS

Specified for V_DDof 2.7 V to 5.25 V

Power consumption

AD7938/AD7939

REFIN/

REFOUT

2.5V

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

VREF

CLKIN

CONVST

BUSY

12-/10-BIT

SAR ADC

AND

I/P

MUX

T/H

CONTROL

4-channel fully differential inputs

4-channel pseudo differential inputs

7-channel pseudo differential inputs

Accurate on-chip 2.5 V reference

SEQUENCER

PARALLEL INTERFACE/CONTROL REGISTER

DRIVE

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

69 dB SINAD 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: 2 µA maximum

32-lead LFCSP and TQFP packages

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.

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

including analog input range and configuration, output coding,

power management, and channel sequencing.

PRODUCT HIGHLIGHTS

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.

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 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

3 V or 5 V processor systems independent of V_DD

6. No pipeline delay.

CONVST

falling edge of

this point.

and the conversion is also initiated at

CONVST

7. Accurate control of the sampling instant via a

input and once-off conversion control.

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.

Table 1. Related Devices

Device

No. of Bits

No. of Channels

Speed

AD7933/AD7934 12/10

1.5 MSPS

625 kSPS

AD7938-6

AD7934-6

Rev. C

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

rightsof third parties that may result fromits 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 andregisteredtrademarks 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

12 3 4 5 6 7...36

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与AD7938_15相关器件

型号	品牌	获取价格	描述	数据表
AD7938-6	ADI	获取价格	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
AD7938-6BCP	ADI	获取价格	暂无描述
AD7938-6BSU	ADI	获取价格	暂无描述
AD7938BCP	ADI	获取价格	8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
AD7938BCP	ROCHESTER	获取价格	8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, MO-220-VHHD-2, LFCSP-32
AD7938BCP-6	ADI	获取价格	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
AD7938BCP-6REEL7	ADI	获取价格	8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
AD7938BCP-REEL	ADI	获取价格	IC 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, MO-220-VHHD-2, LFCSP-
AD7938BCP-REEL7	ADI	获取价格	IC 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, MO-220-VHHD-2, LFCSP-
AD7938BCP-REEL7	ROCHESTER	获取价格	8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC32, MO-220-VHHD-2, LFCSP-32

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