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AD7995YRJZ-0 датащи(PDF) 1 Page - Analog Devices

номер детали AD7995YRJZ-0
подробное описание детали  4-Channel, 12-/10-/8-Bit ADC with I2CCompatible Interface in 8-Lead SOT23
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домашняя страница  http://www.analog.com
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AD7995YRJZ-0 датащи(HTML) 1 Page - Analog Devices

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4-Channel, 12-/10-/8-Bit ADC with I2C-
Compatible Interface in 8-Lead SOT23
Preliminary Technical Data
AD7991/AD7995/AD7999
Rev. PrB
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
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
12-/10-/8-bit ADC with fast conversion time: 2 µs typ
4 Channel / 3 Channel 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 max
8-lead SOT23 package
APPLICATIONS
System Monitoring
Battery Powered Systems
Data Acquisition
Medical Instruments
FUNCTIONAL BLOCK DIAGRAM
T/H
I/P
MUX
VIN0
VDD
12-/10-/8-BIT
SAR
ADC
SCL
SDA
GND
VIN1
AD7991/7995/7999
CONTROL
LOGIC &
I2C
INTERFACE
VIN2
VIN3/Vref
Figure 1.
GENERAL DESCRIPTION
The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power,
successive approximation ADCs with an I2C-compatible
interface. The parts operate from a single 2.7 V to 5.5 V power
supply and feature a 2 µs conversion time. The part contains a
4-channel multiplexer and track-and-hold amplifier that can
handle input frequencies up to 11 MHz.
The AD7991/AD7995/AD7999 provides a 2-wire serial
interface compatible with I2C interfaces. The parts come in two
versions with each part having an individual I2C address. This
will allow two of the same devices be connected to the same I2C
bus. Both parts support standard, fast and high-speed I2C
interface modes
The AD7991/AD7995/AD7999 normally remain in a shutdown
state while not converting, and power up only for conversions.
The conversion process is controlled by a command mode,
where every time an I2C read operation is executed on the
AD7991/AD7995/AD7999, a conversion is performed and the
result is returned on the I2C bus.
The reference for the part is taken from VDD, this allows the
widest dynamic input range to the ADC. Thus the analog input
range to the ADC is 0V to VDD. An external reference may also
be used with this part. The external reference may be applied
through the Ain3 input.
PRODUCT HIGHLIGHTS
1.
4 single ended analog input channels, with the option of
having 3 single ended analog input channels and 1
reference input channel.
2.
I2C compatible serial Interface. Standard, Fast and Hs-
Modes
3.
Automatic shutdown.
4.
Reference derived from the power supply or external
reference.
5.
8-lead SOT23 Package.
Table 1 Related Devices
Device Number
Resolution
Input Channels
AD7998
12
8
AD7997
10
8
AD7994
12
4
AD7993
10
4
AD7992
12
2


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