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| 型号： | EVAL-AD7291SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/29页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7291 |
| 标准包装： | 1 |
| ADC 的数量： | 8 |
| 位数： | 12 |
| 采样率（每秒）： | 22.22k |
| 数据接口： | I²C |
| 已用 IC / 零件： | AD7291 |
| 已供物品： | 板 |
| 相关产品： | AD7291BCPZ-RL7-ND - IC ADC I2C/SRL 22.22K 20LFCSP AD7291BCPZ-ND - IC ADC 12BIT SAR 8CH 20-LFCSP |
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8-Channel, I2C, 12-Bit SAR ADC
with Temperature Sensor
Data Sheet
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
2011 Analog Devices, Inc. All rights reserved.
FEATURES
12-bit SAR ADC
8 single-ended analog input channels
Analog input range: 0 V to 2.5 V
12-bit temperature-to-digital converter
Temperature sensor accuracy of ±1°C typical
Channel sequencer operation
Specified for VDD of 2.8 V to 3.6 V
Logic voltage VDRIVE = 1.65 V to 3.6 V
Internal 2.5 V reference
I2C-compatible serial interface supports standard and
fast speed modes
Out of range indicator/alert function
Autocycle mode
Power-down current: 12 μA maximum
Temperature range: 40°C to +125°C
20-lead LFCSP package
FUNCTIONAL BLOCK DIAGRAM
TEMP
SENSOR
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
INPUT
MUX
T/H
VDD
GND
PD/RST
SCL
SDA
AS1
AS0
VDRIVE
VIN7
VIN0
CONTROL LOGIC
I2C INTERFACE
SEQUENCER
VREF
BUF
REF
AD7291
0
87
1
1-
00
1
ALERT
Figure 1.
GENERAL DESCRIPTION
The AD7291 is a 12-bit, low power, 8-channel, successive
approximation analog-to-digital converter (ADC) with an
internal temperature sensor.
The part operates from a single 3.3 V power supply and features
an I2C-compatible interface. The part contains a 9-channel
multiplexer and a track-and-hold amplifier than can handle
frequencies up to 30 MHz. The device has an on-chip 2.5 V
reference that can be disabled to allow the use of an external
reference.
The AD7291 provides a 2-wire serial interface compatible with
I2C interfaces. The I2C interface supports standard and fast I2C
interface modes. The AD7291 normally remains in a partial
power-down state while not converting and powers up for
conversions. The conversion process can be controlled by a
command mode where conversions occur across I2C write
operations or an autocycle mode selected through software
control.
The AD7291 includes a high accuracy band gap temperature
sensor, which is monitored and digitized by the 12-bit ADC to
give a resolution of 0.25°C.
The AD7291 offers a programmable sequencer, which enables
the selection of a preprogrammable sequence of channels for
conversion.
On-chip limit registers can be programmed with high and low
limits for the conversion results; an out-of-range indicator
output (ALERT) becomes active when the programmed high
or low limits are violated by the conversion result. This output
can be used as an interrupt.
PRODUCT HIGHLIGHTS
1.
Ideally suited to monitoring system variables in a variety
of systems including telecommunications, process control,
and industrial control.
2.
I2C-compatible serial interface, which supports standard
and fast modes.
3.
Automatic partial power-down while not converting to
maximize power efficiency.
4.
Channel sequencer operation.
5.
Integrated temperature sensor with 0.25°C resolution.
6.
Out of range indicator that can be software disabled or
enabled.
Table 1. AD7291 and Related Products
Device
Resolution
Interface
Features
12-bit
I2C
8-channel, I2C, 12-bit SAR
ADC with temperature sensor
12-bit
SPI
8-channel, 1 MSPS, 12-bit SAR
ADC with temperature sensor
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