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參數(shù)資料
| 型號(hào)： | AD7703CR-REEL |
| 廠(chǎng)商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 20BIT LC2MOS MONO 20-SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 位數(shù)： | 20 |
| 采樣率（每秒）： | 4k |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 37mW |
| 電壓電源： | 模擬和數(shù)字，雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類(lèi)型： | 1 個(gè)單端，單極；1 個(gè)單端，雙極 |
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REV. E
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. 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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
2003 Analog Devices, Inc. All rights reserved.
AD7703
LC2MOS
20-Bit A/D Converter
FEATURES
Monolithic 16-Bit ADC
0.0015% Linearity Error
On-Chip Self-Calibration Circuitry
Programmable Low-Pass Filter
0.1 Hz to 10 Hz Corner Frequency
0 V to +2.5 V or
2.5 V Analog Input Range
4 kSPS Output Data Rate
Flexible Serial Interface
Ultralow Power
APPLICATIONS
Industrial Process Control
Weigh Scales
Portable Instrumentation
Remote Data Acquisition
FUNCTIONAL BLOCK DIAGRAM
4
17
9
10
8
5
19
20
13
DGND
AVDD
DVDD
AVSS
DVSS
SC1
SC2
14
15
7
6
AGND
AIN
VREF
CALIBRATION
SRAM
CALIBRATION
MICROCONTROLLER
CAL
BP/
UP
SLEEP
CLOCK
GENERATOR
SDATA
SCLK
2
18
CLKIN
CLKOUT
MODE
CS
DRDY
AD7703
ANALOG
MODULATOR
12
11
6-POLE GAUSSIAN
LOW-PASS
DIGITAL FILTER
20-BIT CHARGE BALANCE A/D
CONVERTER
3
16
1
SERIAL INTERFACE
LOGIC
GENERAL DESCRIPTION
The AD7703 is a 20-bit ADC that uses a
S-D conversion tech-
nique. The analog input is continuously sampled by an analog
modulator whose mean output duty cycle is proportional to the
input signal. The modulator output is processed by an on-chip
digital filter with a six-pole Gaussian response, which updates the
output data register with 16-bit binary words at word rates up to
4kHz. The sampling rate, filter corner frequency, and output
word rate are set by a master clock input that may be supplied
externally, or by a crystal controlled on-chip clock oscillator.
The inherent linearity of the ADC is excellent and endpoint accu-
racy is ensured by self-calibration of zero and full scale, which
may be initiated at any time. The self-calibration scheme can
also be extended to null system offset and gain errors in the input
channel.
The output data is accessed through a flexible serial port, which
has an asynchronous mode compatible with UARTs and two
synchronous modes suitable for interfacing to shift registers or
the serial ports of industry-standard microcontrollers.
CMOS construction ensures low power dissipation, and a power-
down mode reduces the idle power consumption to only 10 W.
PRODUCT HIGHLIGHTS
1. The AD7703 offers 20-bit resolution coupled with outstanding
0.0003% accuracy.
2. No missing codes ensures true, usable, 20-bit dynamic range,
removing the need for programmable gain and level-setting
circuitry.
3. The effects of temperature drift are eliminated by on-chip
self-calibration, which removes zero and gain error. External
circuits can also be included in the calibration loop to remove
system offsets and gain errors.
4. Flexible synchronous/asynchronous interface allows the
AD7703 to interface directly to the serial ports of industry-
standard microcontrollers and DSP processors.
5. Low operating power consumption and an ultralow power
standby mode make the AD7703 ideal for loop-powered
remote sensing applications, or battery-powered portable
instruments.
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參數(shù)描述 |
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| AD7703CRZ | 功能描述:IC ADC 20BIT LC2MOS MONO 20SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類(lèi)型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類(lèi)型:1 個(gè)單端，雙極 |
| AD7703SQ | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:LC2MOS 20-Bit A/D Converter |
| AD7705 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs |
| AD7705_06 | 制造商:AD 制造商全稱(chēng):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(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:2 個(gè)單端，單極 |
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