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| 型号： | AD7995YRJZ-1RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 4CH I2C SOT23-8 |
| 产品变化通告： | AD7991,5,9 Offset Error Change 17/Sept/2010 |
| 设计资源： | Using AD8599 as an Ultralow Distortion Driver for the AD7995 (CN0044) |
| 标准包装： | 10,000 |
| 位数： | 10 |
| 采样率（每秒）： | 1M |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 4.68mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 4 个单端，单极 |
| 配用： | EVAL-AD7995EBZ-ND - BOARD EVAL FOR AD7995 |
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4-Channel, 12-/10-/8-Bit ADC with
I2C-Compatible Interface in 8-Lead SOT-23
AD7991/AD7995/AD7999
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
2007–2010 Analog Devices, Inc. All rights reserved.
FEATURES
12-/10-/8-bit ADCs with fast conversion time: 1 μs typical
4 analog input channels/3 analog input channels with
reference input
Specified for VDD of 2.7 V to 5.5 V
Sequencer operation
Temperature range: 40°C to +125°C
I2C-compatible serial interface supports standard, fast,
and high speed modes
2 versions allow 2 I2C addresses
Low power consumption
Shutdown mode: 1 μA maximum
8-lead SOT-23 package
APPLICATIONS
System monitoring
Battery-powered systems
Data acquisition
Medical instruments
FUNCTIONAL BLOCK DIAGRAM
I/P
MUX
SCL
SDA
GND
AD7991/AD7995/AD7999
12-/10-/8-BIT
SAR
ADC
CONTROL
LOGIC AND
I2C
INTERFACE
VIN0
VDD
06
46
1-
0
01
VIN1
VIN2
VIN3/VREF
T/H
Figure 1.
GENERAL DESCRIPTION
The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power,
successive approximation ADCs with an I2C-compatible interface.
Each part operates from a single 2.7 V to 5.5 V power supply and
features a 1 μs conversion time. The track-and-hold amplifier
allows each part to handle input frequencies of up to 14 MHz,
and a multiplexer allows taking samples from four channels.
Each AD7991/AD7995/AD7999 provides a 2-wire serial
interface compatible with I2C interfaces. The AD7991 and
AD7995 come in two versions and each version has an
individual I2C address. This allows two of the same devices to be
connected to the same I2C bus. Both versions support standard,
fast, and high speed I2C interface modes. The AD7999 comes in
one version.
The AD7991/AD7995/AD7999 normally remain in a shutdown
state, powering up only for conversions. The conversion process
is controlled by a command mode, during which each I2C read
operation initiates a conversion and returns the result over the
I2C bus.
When four channels are used as analog inputs, the reference for
the part is taken from VDD; this allows the widest dynamic input
range to the ADC. Therefore, the analog input range to the
ADC is 0 V to VDD. An external reference, applied through the
VIN3/VREF input, can also be used with this part.
PRODUCT HIGHLIGHTS
1.
Four single-ended analog input channels, or three single-
ended analog input channels and one reference input channel.
2.
I2C-compatible serial interface. Standard, fast, and high
speed modes.
3.
Automatic shutdown.
4.
Reference derived from the power supply or external
reference.
5.
8-lead SOT-23 package.
Table 1. Related Devices
Device
Resolution
Input Channels
12
8
10
8
12
4
10
4
12
2
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