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AD7291 Datasheet

12-Bit SAR ADC

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Data Sheet
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
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 device operates from a single 3.3 V power supply and
features an I2C-compatible interface. The device 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.
8-Channel, I2C, 12-Bit SAR ADC
with Temperature Sensor
AD7291
FUNCTIONAL BLOCK DIAGRAM
VDD GND
VREF
REF
BUF
VIN0
VIN7
INPUT
MUX
12-BIT
T/H
SUCCESSIVE
APPROXIMATION
ADC
AD7291
TEMP
SENSOR
SEQUENCER
CONTROL LOGIC
I2C INTERFACE
SCL
SDA
AS1
AS0
VDRIVE
PD/RST
ALERT
Figure 1.
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
AD7291 12-bit
I2C
8-channel, I2C, 12-bit SAR
ADC with temperature sensor
AD7298 12-bit
SPI
8-channel, 1 MSPS, 12-bit SAR
ADC with temperature sensor
Rev. C
Document Feedback
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. Specifications subject to change without notice. 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 ©2011–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7291 Datasheet

12-Bit SAR ADC

No Preview Available !

AD7291
TABLE OF CONTENTS
Features .............................................................................................. 1 
Functional Block Diagram .............................................................. 1 
General Description ......................................................................... 1 
Product Highlights ........................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
I2C Timing Specifications............................................................ 5 
Absolute Maximum Ratings............................................................ 6 
Thermal Resistance ...................................................................... 6 
ESD Caution.................................................................................. 6 
Pin Configuration and Function Descriptions............................. 7 
Typical Performance Characteristics ............................................. 8 
Terminology .................................................................................... 11 
Circuit Information ........................................................................ 12 
Converter Operation.................................................................. 12 
Analog Input ............................................................................... 12 
ADC Transfer Function............................................................. 13 
Temperature Sensor Operation ................................................ 13 
Temperature Sensor Averaging................................................. 13 
VDRIVE ............................................................................................ 14 
The Internal or External Reference.......................................... 14 
Reset ............................................................................................. 14 
Internal Register Structure ............................................................ 15 
REVISION HISTORY
10/2016—Rev. B to Rev. C
Changes to Command Mode Section .......................................... 25
10/2011—Rev. A to Rev. B
Changes to Table 9.......................................................................... 16
8/2011—Rev. 0 to Rev. A
Changes to Temperature Sensor—Internal, Accuracy Parameter,
Table 2 ................................................................................................ 3
1/2011—Revision 0: Initial Version
Data Sheet
Address Pointer Register ........................................................... 15 
Command Register (0x00)........................................................ 17 
Voltage Conversion Result Register (0x01) ............................ 18 
TSENSE Conversion Result Register (0x02)................................ 18 
TSENSE Average Result Register (0x03) ...................................... 19 
Limit Registers (0x04 to 0x1E) ................................................. 19 
Hysteresis Register ..................................................................... 20 
Alert Status Register A and Alert Status Register B (0x1F and
0x20)............................................................................................. 20 
I2C Interface .................................................................................... 21 
Serial Bus Address Byte ............................................................. 21 
General I2C Timing.................................................................... 21 
Writing to the AD7291 .................................................................. 22 
Writing Two Bytes of Data to a 16-Bit Register ..................... 22 
Writing to Multiple Registers.................................................... 22 
Reading Data From the AD7291.................................................. 23 
Reading Two Bytes of Data from a 16-Bit Register ............... 23 
Modes of Operation ....................................................................... 24 
Command Mode ........................................................................ 24 
Autocycle Mode.......................................................................... 26 
Outline Dimensions ....................................................................... 27 
Ordering Guide .......................................................................... 27 
Rev. C | Page 2 of 28


Part Number AD7291
Description 12-Bit SAR ADC
Maker Analog Devices
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AD7291 Datasheet PDF






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