Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

AD7294 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD7294
Description  12-Bit, Multichannel, DAC/ADC Temperature Sensor and Current Sense for Monitor and Control Applications
Download  45 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo 

AD7294 Datasheet(HTML) 1 Page - Analog Devices

 
Zoom Inzoom in Zoom Outzoom out
 1 / 45 page
background image
12-Bit, Multichannel, DAC/ADC Temperature Sensor and
Current Sense for Monitor and Control Applications
Preliminary Technical Data
AD7294
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
4-channel 12-bit DAC
Guaranteed monotonic
10 μs settling time
10 mA sink and source capability
Offset in for range adjustment
Output span: 5 V in 0 to 15 V range
9-channel, 12-bit ADC
200 kSPS throughput
Input range: 0 to VREF, 0 to 2 VREF
Differential/single-ended
Limit registers per channel
2 high-side current sense
48 V max operation
±1% FS accuracy
±200 mV input range
3-channel temperature sensor
Diode temperature measurement
±2°C accuracy
Measurement range: −10°C to +90°C
Internal 2.5 V reference
I2C®-compatible serial interface
Temperature range: −40°C to +105°C
Alert function
Package type: LFCSP-56, TQFP-64
APPLICATIONS
Cellular base station (GSM, EDGE, UMTS, CDMA)
Point-to-multipoint and other RF transmission systems
12 V, 24 V, 48 V automotive applications
Industrial control
GENERAL DESCRIPTION
The AD7294 contains all the functions required for general-
purpose monitoring and control of current, voltage, and
temperature integrated into a single-chip solution. The part
includes low voltage (±200 mV) analog-input sense amplifiers
for current monitoring across shunt resistors, temperature-sense
inputs, and four uncommitted analog input channels multiplexed
into a 200 kSPS SAR ADC. An internal low ppm reference is
provided to drive both the DAC and ADC. Four 12-bit DACs
provide the outputs for voltage control. The AD7294 also includes
limit registers for alarm functions. The part is designed on a high
voltage DMOS process for a high voltage compliance, 48 V on
the current-sense inputs, and up to 15 V DAC output voltage.
The part is ideal for bias current control of the power transistors
used in power amplifiers employed in CDMA, GSM, EDGE, and
UMTS cellular base stations.
The DACs provide digital control with 1.2 mV resolution to
control the bias currents of the power transistors. They can also
be used to provide control voltages for variable gain amplifiers
or impedance match networks in the main signal chain. Thermal
diode based temperature sensors are incorporated to compensate
for temperature effects. The ADC monitors the high-side current
and temperature. All this functionality is provided in a 56-lead
LFCSP package and a 64-lead TQFP package operating over a
temperature range of −40°C to +105°C.
FUNCTIONAL BLOCK DIAGRAM
100K
200K
12-BIT
ADC
100K
200K
100K
200K
12-BIT
DAC
LIMIT
REGISTERS
MUX
2.5V
REF
CONTROL
LOGIC
I2C INTERFACE
PROTOCOL
TEMP
SENSOR
HIGH SIDE
CURRENT
SENSE
HIGH SIDE
CURRENT
SENSE
100K
200K
100K
200K
12-BIT
DAC
100K
200K
100K
200K
12-BIT
DAC
100K
200K
12-BIT
DAC
REFOUT/
REFIN DAC
T1
T0
SDA SCL A2
ALERT
A1 A0
VOUT A
OFFSET IN A
VOUT B
VOUT C
VOUT D
OFFSET IN B
OFFSET IN C
OFFSET IN D
FILTER
RF CHOKE
RF OUT
FILTER
GAIN
CONTROL
IMPEDANCE
MATCH
LDMOS
LDMOS
RS1(+)
RS2(+)
RS1(-)
RS2(-)
VIN 0
VIN 1
VIN 2
VIN 3
D1 (+)
D1 (-)
D0 (-)
ISENSE2
OVER-RANGE
RSense
DVDD
DGND(1-2)
AVDD(1-5) AGND(1-9) V+(1-2)
AD7294
REFOUT/
REFIN ADC
VPP(1-2)
D0 (+)
CAP
SET-POINT
240mV
ISENSE1
OVER-RANGE
Figure 1. Typical Configuration for AD7294 in Cellular Base Station RF LDMOS Power Amplifier Control


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn