AD7921

更新时间： 2024-11-23 22:49:59

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
28页	312K
描述
2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs

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AD7921 数据手册

2-Channel, 2.35 V to 5.25 V

250 kSPS, 10-/12-Bit ADCs

AD7911/AD7921

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Fast throughput rate: 250 kSPS

Specified for V_DDof 2.35 V to 5.25 V

Low power:

4 mW typ at 250 kSPS with 3 V supplies

13.5 mW typ at 250 kSPS with 5 V supplies

Wide input bandwidth:

IN0

IN1

10-/12-BIT

SUCCESSIVE

APPROXIMATION

ADC

T/H

MUX

71 dB minimum SNR at 100 kHz input frequency

Flexible power/serial clock speed management

No pipeline delays

SCLK

High speed serial interface:

AD7911/AD7921

CONTROL LOGIC

SPI®/QSPI™/MICROWIRE™/DSP compatible

Standby mode: 1 µA maximum

8-lead TSOT package

DOUT

DIN

8-lead MSOP package

GND

APPLICATIONS

Figure 1.

Battery-powered systems:

Personal digital assistants

Medical instruments

Mobile communications

Instrumentation and control systems

Data acquisition systems

High speed modems

The AD7911/AD7921 use advanced design techniques to

achieve very low power dissipation at high throughput rates.

The reference for the part is taken internally from V_DD, thereby

allowing the widest dynamic input range to the ADC. The

analog input range for the part, therefore, is 0 to V_DD. The

conversion rate is determined by the SCLK signal.

Optical sensors

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The AD7911/AD7921¹are 10-bit and 12-bit, high speed, low

power, 2-channel successive approximation ADCs, respectively.

The parts operate from a single 2.35 V to 5.25 V power supply

and feature throughput rates of up to 250 kSPS. The parts

contain a low noise, wide bandwidth track-and-hold amplifier,

which can handle input frequencies in excess of 6 MHz. The

1. 2-channel, 250 kSPS, 10-/12-bit ADCs in TSOT package.

2. Low power consumption.

3. Flexible power/serial clock speed management.

The conversion rate is determined by the serial clock;

conversion time is reduced when the serial clock speed is

increased. The parts also feature a power-down mode to

maximize power efficiency at lower throughput rates.

Average power consumption is reduced when the power-

down mode is used while not converting. Current

consumption is 1 µA maximum and 50 nA typically when

in power-down mode.

conversion process and data acquisition are controlled using

and the serial clock, allowing the devices to interface with

microprocessors or DSPs. The input signal is sampled on the

falling edge of , and the conversion is also initiated at this

point. There are no pipeline delays associated with the part.

4. Reference derived from the power supply.

5. No pipeline delay.

The channel to be converted is selected through the DIN pin,

The parts feature a standard successive approximation

and the mode of operation is controlled by . The serial data

ADC with accurate control of the sampling instant via a

input and once-off conversion control.

stream from the DOUT pin has a channel identifier bit, which

provides information about the converted channel.

¹Protected by U.S. Patent Number 6,681,332.

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

Fax: 781.326.8703

www.analog.com

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与AD7921相关器件

型号	品牌	获取价格	描述	数据表
AD7921ARM	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921ARM-REEL	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921ARM-REEL7	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921ARMZ	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921ARMZ-REEL	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921ARMZ-REEL7	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921AUJ-R2	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921AUJ-REEL7	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
AD7921AUJ-RL2	ADI	获取价格	IC 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8, MO-193BA, TSOT-23, Anal
AD7921AUJZ-R2	ADI	获取价格	2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs

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