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參數資料
| 型號： | AD7705 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs |
| 中文描述： | 3伏/ 5伏，1毫瓦2-/3-Channel 16位Σ-Δ模數轉換器 |
| 文件頁數： | 1/32頁 |
| 文件大小： | 264K |
| 代理商： | AD7705 |
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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.
a
AD7705/AD7706
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1998
3 V/5 V, 1 mW
2-/3-Channel 16-Bit, Sigma-Delta ADCs
FUNCTIONAL BLOCK DIAGRAM
FEATURES
AD7705: Two Fully Differential Input Channel ADCs
AD7706: Three Pseudo Differential Input Channel ADCs
16 Bits No Missing Codes
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 @ 3V
Standby Current 8
m
A max
16-Lead DIP, 16-Lead SOIC and TSSOP Packages
GENERAL DESCRIPTION
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.
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 +20mV
through 0 V to +2.5V can be incorporated on both devices when
operating with a V
DD
of 5 V and a reference of 2.5 V. They can
also handle bipolar input signal ranges of
±
20mV through
±
2.5V,
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 +10mV through 0 V to +1.225V.
Its bipolar input signal ranges are
±
10mV through
±
1.225V.
The AD7705/AD7706 thus perform all signal conditioning and
conversion for a two- or three-channel system.
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
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
μ
W 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.
PRODUCT HIGHLIGHTS
1. The AD7705/AD7706 consumes less than 1 mW at 3 V
supplies and 1MHz master clock, making it ideal for use in
low power systems. Standby current is less than 8
μ
A.
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 (<600nV). Endpoint errors and the effects of
temperature drift are eliminated by on-chip calibration op-
tions, which remove zero-scale and full-scale errors.
*
*
Protected by U.S. Patent Number 5,134,401.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor.
V
DD
REF IN(–)
REF IN(+)
AD7705/AD7706
MAX
PGA
BUFFER
CHARGE
BALANCING
A/D CONVERTER
-
MODULATOR
DIGITAL FILTER
A = 1
<
128
SERIAL INTERFACE
REGISTER BANK
CLOCK
GENERATION
MCLK IN
MCLK OUT
GND
DRDY
RESET
DIN
DOUT
CS
SCLK
ANALOG
INPUT
CHANNELS
相關PDF資料 |
PDF描述 |
|---|---|
| AD7705BN | ECONOLINE: REC2.2-S_DR/H1 - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- UL94V-0 Package Material- Continuous Short Circiut Protection- Internal SMD design- 100% Burned In- Efficiency to 75% |
| AD7705BR | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| AD7705BRU | 3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs |
| AD7706 | 3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs |
| AD7706BN | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7705_06 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs |
| AD7705BN | 功能描述:IC ADC 16BIT 2CH 16-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極 |
| AD7705BNZ | 功能描述:IC ADC 16BIT 2CH 16-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7705BNZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs |
| AD7705BR | 功能描述:IC ADC 16BIT 2CH 16-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
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