AD7294 12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense

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

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 device 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 conversion 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 device 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 functionality is provided in a 64-lead TQFP or a 56-lead LFCSP operating over a temperature range of −40°C to +105°C.

Applications

Features and Benefits

12-bit SAR ADC with 3 μs conversion time
4 uncommitted analog inputs - (Please see data sheet for additional information)
2 high-side current sense inputs
5 V to 59.4 V operating range - (Please see data sheet for additonal information)
2 external diode temperature sensor inputs
−55°C to +150°C measurement range (Please see data sheet for addtional information)
1 internal temperature sensor
±2°C accuracy

Built-in monitoring features
Minimum/maximum recorder for each channel - (Please see data sheet for additional information)
Four 12-bit monotonic 15 V DACs
5 V span, 0 V to 10 V offset - (Please see data sheet for additional information)
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

Analog to Digital Converters

A/D Converters

Data Sheets

Document	note
AD7294: 12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense Data Sheet (Rev. I)	PDF 1.25 M

User Guides

Document	note
UG-1004: Evaluating the AD7294 12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense (Rev. A)	PDF 1.91 M

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7294BCPZ Production	56 ld LFCSP (8x8mm)	OTH 260	-40 to 105C	11.56	9.83	Y
AD7294BCPZRL Production	56 ld LFCSP (8x8mm)	REEL 2500	-40 to 105C	0	9.83	Y
AD7294BSUZ Production	64 ld TQFP(7x7mm)	OTH 250	-40 to 105C	11.56	9.83	Y
AD7294BSUZRL Production	64 ld TQFP(7x7mm)	REEL 2000	-40 to 105C	0	9.83	Y