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AD7294 데이터시트(PDF) 1 Page - Analog Devices |
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AD7294 데이터시트(HTML) 1 Page - Analog Devices |
1 / 45 page 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 |
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