AD7705BRU

更新时间： 2024-11-25 22:39:03

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器光电二极管
页数	文件大小	规格书
32页	266K
描述
3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs

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AD7705BRU 数据手册

3 V/5 V, 1 mW

2-/3-Channel 16-Bit, Sigma-Delta ADCs

AD7705/AD7706^*

FUNCTIONAL BLOCK DIAGRAM

FEATURES

AD7705: Two Fully Differential Input Channel ADCs

AD7706: Three Pseudo Differential Input Channel ADCs

16 Bits No Missing Codes

REF IN(–)

REF IN(+)

AD7705/AD7706

0.003% Nonlinearity

Programmable Gain Front End

Gains from 1 to 128

Three-Wire Serial Interface

SPI™, QSPI™, MICROWIRE™ and DSP Compatible

Schmitt Trigger Input on SCLK

Ability to Buffer the Analog Input

2.7 V to 3.3 V or 4.75 V to 5.25 V Operation

Power Dissipation 1 mW max @ 3 V

Standby Current 8 ␮A max

CHARGE

BALANCING

A/D CONVERTER

ANALOG

INPUT

CHANNELS

⌺ - ⌬

MODULATOR

PGA

MAX

BUFFER

A = 1Ϸ128

DIGITAL FILTER

16-Lead DIP, 16-Lead SOIC and TSSOP Packages

SERIAL INTERFACE

GENERAL DESCRIPTION

SCLK

MCLK IN

The AD7705/AD7706 are complete analog front ends for low

frequency measurement applications. These two-/three-channel

devices can accept low level input signals directly from a trans-

ducer and produce a serial digital output. They employ a sigma-

delta conversion technique to realize up to 16 bits of no missing

codes performance. The selected input signal is applied to a

proprietary programmable gain front end based around an ana-

log modulator. The modulator output is processed by an on-

chip digital filter. The first notch of this digital filter can be

programmed via an on-chip control register allowing adjustment

of the filter cutoff and output update rate.

CLOCK

GENERATION

MCLK OUT

DIN

DOUT

GND

DRDY RESET

using the input serial port. The part contains self-calibration and

system calibration options to eliminate gain and offset errors on

the part itself or in the system.

CMOS construction ensures very low power dissipation, and the

power-down mode reduces the standby power consumption to

20 µW typ. These parts are available in a 16-lead, 0.3 inch-wide,

plastic dual-in-line package (DIP), a 16-lead wide body (0.3

inch) small outline (SOIC) package and also a low profile 16-

lead TSSOP.

The AD7705/AD7706 operate from a single 2.7 V to 3.3 V or

4.75 V to 5.25 V supply. The AD7705 features two fully differ-

ential analog input channels while the AD7706 features three

pseudo differential input channels. Both devices feature a differ-

ential reference input. Input signal ranges of 0 mV to +20 mV

through 0 V to +2.5 V can be incorporated on both devices when

operating with a V_DDof 5 V and a reference of 2.5 V. They can

also handle bipolar input signal ranges of ±20 mV through ±2.5 V,

which are referenced to the AIN(–) inputs on the AD7705 and to

the COMMON input on the AD7706. The AD7705/AD7706,

with 3 V supply and a 1.225 V reference, can handle unipolar

input signal ranges of 0 mV to +10 mV through 0 V to +1.225 V.

Its bipolar input signal ranges are ±10 mV through ±1.225 V.

The AD7705/AD7706 thus perform all signal conditioning and

conversion for a two- or three-channel system.

PRODUCT HIGHLIGHTS

1. The AD7705/AD7706 consumes less than 1 mW at 3 V

supplies and 1 MHz master clock, making it ideal for use in

low power systems. Standby current is less than 8 µA.

2. The programmable gain input allows the AD7705/AD7706

to accept input signals directly from a strain gage or trans-

ducer, removing a considerable amount of signal conditioning.

3. The AD7705/AD7706 is ideal for microcontroller or DSP

processor applications with a three-wire serial interface re-

ducing the number of interconnect lines and reducing the

number of opto-couplers required in isolated systems.

4. The part features excellent static performance specifications

with 16 bits, no missing codes, ±0.003% accuracy and low

rms noise (<600 nV). Endpoint errors and the effects of

temperature drift are eliminated by on-chip calibration op-

tions, which remove zero-scale and full-scale errors.

The AD7705/AD7706 are ideal for use in smart, microcontroller

or DSP-based systems. They feature a serial interface that can

be configured for three-wire operation. Gain settings, signal

polarity and update rate selection can be configured in software

*Protected by U.S. Patent Number 5,134,401.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor.

REV. A

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

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AD7705BRU 替代型号

型号	品牌	替代类型	描述	数据表
AD7705BRUZ-REEL7	ADI	完全替代	3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC
AD7705BRZ-REEL	ADI	完全替代	3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC
AD7705BRUZ	ADI	类似代替	3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC

与AD7705BRU相关器件

型号	品牌	获取价格	描述	数据表
AD7705BRU-REEL	ADI	获取价格	3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs
AD7705BRU-REEL7	ADI	获取价格	3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs
AD7705BRUZ	ADI	获取价格	3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC
AD7705BRUZ	ROCHESTER	获取价格	2-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16, LEAD FREE, MO-153AB, TSSOP-16
AD7705BRUZ1	ADI	获取价格	3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs
AD7705BRUZ-REEL1	ADI	获取价格	3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs
AD7705BRUZ-REEL7	ADI	获取价格	3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC
AD7705BRUZ-REEL7	ROCHESTER	获取价格	2-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16, LEAD FREE, MO-153AB, TSSOP-16
AD7705BRUZ-REEL71	ADI	获取价格	3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs
AD7705BRZ	ROCHESTER	获取价格	2-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16, 0.300 INCH, LEAD FREE, MS-013AA, SOIC-

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