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參數資料
型號: AD7294BCPZRL
廠商: Analog Devices Inc
文件頁數: 1/49頁
文件大?。?/td> 0K
描述: IC ADC 12BIT I2C/SRL 1M 56LFCSP
標準包裝: 2,500
類型: ADC,DAC
分辨率(位): 12 b
采樣率(每秒): 22.22k
數據接口: I²C,串行
電壓電源: 模擬和數字
電源電壓: 4.4 V ~ 5.5 V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 56-VFQFN 裸露焊盤,CSP
供應商設備封裝: 56-LFCSP-VQ(8x8)
包裝: 帶卷 (TR)
12-Bit Monitor and Control System with Multichannel
ADC, DACs, Temperature Sensor, and Current Sense
Data Sheet
Rev. H
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
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
Fax: 781.461.3113
2008–2012 Analog Devices, Inc. All rights reserved.
FEATURES
12-bit SAR ADC with 3 μs conversion time
4 uncommitted analog inputs
Differential/single-ended
V
REF, 2 × VREF input ranges
2 high-side current sense inputs
5 V to 59.4 V operating range
0.5% max gain error
±200 mV input range
2 external diode temperature sensor inputs
55°C to +150°C measurement range
±2°C accuracy
Series resistance cancellation
1 internal temperature sensor
±2°C accuracy
Built-in monitoring features
Minimum/maximum recorder for each channel
Programmable alert thresholds
Programmable hysteresis
Four 12-bit monotonic 15 V DACs
5 V span, 0 V to 10 V offset
8 μs settling time
10 mA sink and source capability
Power-on resets (POR) to 0 V
Internal 2.5 V reference
2-wire fast mode I2C interface
Temperature range: 40°C to +105°C
Package type: 64-lead TQFP or 56-lead LFCSP
APPLICATIONS
Cellular base stations
GSM, EDGE, UMTS, CDMA, TD-SCDMA, W-CDMA, WiMAX
Point-to-multipoint and other RF transmission systems
12 V, 24 V, 48 V automotive applications
Industrial controls
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 SAR analog-to-digital converter (ADC) with a 3 μs conver-
sion time. A high accuracy internal reference is provided to drive
both the digital-to-analog converter (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 Analog Devices, Inc., high voltage DMOS process for high
voltage compliance, 59.4 V on the current sense inputs, and up
to a 15 V DAC output voltage.
The AD7294 is a highly integrated solution that offers all the
functionality necessary for precise control of the power amplifier
in cellular base station applications. In these types of applications,
the DACs provide 12-bit resolution to control the bias currents
of the power transistors. Thermal diode-based temperature sensors
are incorporated to compensate for temperature effects. The ADC
monitors the high-side current and temperature. All this function-
ality is provided in a 64-lead TQFP or a 56-lead LFCSP operating
over a temperature range of 40°C to +105°C.
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