参数资料
| 型号： | AD7891AP-1 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC DAS 12BIT 8CH 44-PLCC |
| 标准包装： | 1 |
| 类型： | 数据采集系统（DAS） |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行，并联 |
| 电压电源： | 单电源 |
| 电源电压： | 5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC（16.59x16.59） |
| 包装： | 管件 |
a
AD7891
REV. D
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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
2004 Analog Devices, Inc. All rights reserved.
LC2MOS 8-Channel, 12-Bit
High Speed Data Acquisition System
FUNCTIONAL BLOCK DIAGRAM
2.5V
REFERENCE
TRACK/HOLD
VIN1A
VIN1B
VIN2A
VIN2B
VIN3A
VIN3B
VIN4A
VIN4B
VIN5A
VIN5B
VIN6A
VIN6B
VIN7A
VIN7B
VIN8A
VIN8B
CONTROL LOGIC
WR CS RD EOC CONVST MODE
AGND AGND DGND
CLOCK
VDD VDD
AD7891
12-BIT
ADC
ADDRESS
DECODE
REF OUT/
REF IN
REF GND
STANDBY
M
U
X
DATA/
CONTROL
LINES
FEATURES
Fast 12-Bit ADC with 1.6
s Conversion Time
8 Single-Ended Analog Input Channels
Overvoltage Protection on Each Channel
Selection of Input Ranges:
5 V,
10 V for AD7891-1
0 to +2.5 V, 0 to +5 V,
2.5 V for AD7891-2
Parallel and Serial Interface
On-Chip Track/Hold Amplifier
On-Chip Reference
Single-Supply, Low Power Operation (100 mW Max)
Power-Down Mode (75
W Typ)
APPLICATIONS
Data Acquisition Systems
Motor Control
Mobile Communication Base Stations
Instrumentation
GENERAL DESCRIPTION
The AD7891 is an 8-channel, 12-bit data acquisition system
with a choice of either parallel or serial interface structure. The
part contains an input multiplexer, an on-chip track/hold ampli-
fier, a high speed 12-bit ADC, a 2.5 V reference, and a high
speed interface. The part operates from a single 5 V supply and
accepts a variety of analog input ranges across two models, the
AD7891-1 (
±5V and ±10 V) and the AD7891-2 (0 V to +2.5 V,
0V to +5 V, and
±2.5 V).
The AD7891 provides the option of either a parallel or serial
interface structure determined by the MODE pin. The part
has standard control inputs and fast data access times for both
the serial and parallel interfaces, ensuring easy interfacing to
modern microprocessors, microcontrollers, and digital signal
processors.
In addition to the traditional dc accuracy specifications, such as
linearity, full-scale and offset errors, the part is also specified for
dynamic performance parameters, including harmonic distortion
and signal-to-noise ratio.
Power dissipation in normal mode is 82 mW typical; in
the standby mode, this is reduced to 75
mW typ. The part is
available in a 44-terminal MQFP and a 44-lead PLCC.
PRODUCT HIGHLIGHTS
1. The AD7891 is a complete monolithic 12-bit data acquisition
system that combines an 8-channel multiplexer, 12-bit ADC,
2.5 V reference, and track/hold amplifier on a single chip.
2. The AD7891-2 features a conversion time of 1.6
ms and an
acquisition time of 0.4
ms. This allows a sample rate of
500 kSPS when sampling one channel and 62.5 kSPS when
channel hopping. These sample rates can be achieved using
either a software or hardware convert start. The AD7891-1
has an acquisition time of 0.6
ms when using a hardware
convert start and an acquisition time of 0.7
ms when using a
software convert start. These acquisition times allow sample
rates of 454.5 kSPS and 435 kSPS, respectively, for hardware
and software convert start.
3. Each channel on the AD7891 has overvoltage protection. This
means an overvoltage on an unselected channel does not affect
the conversion on a selected channel. The AD7891-1 can
withstand overvoltages of
±17 V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7891AP-1REEL | 功能描述:IC DAS 12BIT 8CH 44-PLCC RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7891AP2 | 制造商:Analog Devices 功能描述: |
| AD7891AP-2 | 功能描述:IC DAS 12BIT 8CH 44-PLCC RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7891AP-2REEL | 功能描述:IC DAS 12BIT 8CH 44-PLCC RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7891APZ-1 | 功能描述:IC DAS 12BIT 8CH 44-PLCC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
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