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Analog Devices Semiconductor Electronic Components Datasheet

AD7298 Datasheet

12-Bit SAR ADC

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8-Channel, 1 MSPS, 12-Bit SAR ADC
with Temperature Sensor
AD7298
FEATURES
12-bit SAR ADC
8 single-ended inputs
Channel sequencer functionality
Fast throughput of 1 MSPS
Analog input range: 0 V to 2.5 V
12-bit temperature-to-digital converter
Temperature sensor accuracy of ±1°C
Temperature range: −40°C to +125°C
Specified for VDD: 2.8 V to 3.6 V
Logic voltage VDRIVE : 1.65 V to 3.6 V
Power-down current: <10 μA
Internal 2.5 V reference
Internal power-on reset
High speed serial interface SPI
20-lead LFCSP
GENERAL DESCRIPTION
The AD7298 is a 12-bit, high speed, low power, 8-channel,
successive approximation ADC with an internal temperature
sensor. The part operates from a single 3.3 V power supply and
features throughput rates up to 1 MSPS. The device contains a
low noise, wide bandwidth track-and-hold amplifier that can
handle input frequencies in excess of 30 MHz.
The AD7298 offers a programmable sequencer, which enables
the selection of a preprogrammable sequence of channels for
conversion. The device has an on-chip, 2.5 V reference that can
be disabled to allow the use of an external reference.
The AD7298 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 device offers a 4-wire serial
interface compatible with SPI and DSP interface standards.
The AD7298 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. The part also
offers flexible power/throughput rate management options.
The part is offered in a 20-lead LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
VDD
GND
VREF
REF
BUF
VIN0
12-BIT
T/H
SUCCESSIVE
APPROXIMATION
ADC
VIN7
INPUT
MUX
AD7298
TEMP
SENSOR
SEQUENCER
CONTROL
LOGIC
SCLK
DOUT
DIN
CS
VDRIVE
PD/RST
TSENSE_BUSY
Figure 1.
PRODUCT HIGHLIGHTS
1. Ideally Suited to Monitoring System Variables in a Variety
of Systems. This includes telecommunications, and process
and industrial control.
2. High Throughput Rate of 1 MSPS with Low Power
Consumption.
3. Eight Single-Ended Inputs with a Channel Sequencer.
A consecutive sequence of channels can be selected on
which the ADC cycles and converts.
4. Integrated Temperature Sensor with 0.25°C Resolution.
Rev. B
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
www.analog.com
Fax: 781.461.3113 ©2010–2011 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD7298 Datasheet

12-Bit SAR ADC

No Preview Available !

AD7298
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Thermal Resistance ...................................................................... 6
Pin Configuration and Function Description .............................. 7
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 12
Circuit Information ........................................................................ 13
Converter Operation.................................................................. 13
Analog Input ............................................................................... 13
Temperature Sensor Operation ................................................ 14
REVISION HISTORY
6/11—Rev. A to Rev. B
Changes to Internal Temperature Sensor, Accuracy Parameter
in Table 1............................................................................................ 3
1/11—Rev. 0 to Rev. A
Removed Input Impedance Parameter .......................................... 3
Added Input Capacitance Parameter of 8 pF................................ 3
Changes to Figure 11...................................................................... 10
Changed C1 Value to 8 pF in Analog Input Section.................. 13
Changes to Figure 23...................................................................... 14
Changes to Ordering Guide .......................................................... 24
9/10—Revision 0: Initial Version
Temperature Sensor Averaging ................................................ 14
VDRIVE............................................................................................ 15
The Internal or External Reference.......................................... 15
Control Register.............................................................................. 16
Modes of Operation ....................................................................... 17
Traditional Multichannel Mode of Operation........................ 17
Repeat Operation ....................................................................... 18
Power-Down Modes .................................................................. 19
Powering Up the AD7298 ......................................................... 20
Reset ............................................................................................. 20
Serial Interface ................................................................................ 21
Temperature Sensor Read ......................................................... 22
Layout and Configuration............................................................. 23
Power Supply Bypassing and Grounding................................ 23
Temperature Monitoring........................................................... 23
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
Rev. B | Page 2 of 24


Part Number AD7298
Description 12-Bit SAR ADC
Maker Analog Devices
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AD7298 Datasheet PDF






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