Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD7294
Edited by the Electronicstalk Editorial
Team on 08 March 2006
Convertor keeps watch over basestation
environment
The AD7294 multichannel I/O data convertor integrates all the functions required for the monitoring and control of current, voltage and temperature in a single chip.
Targeted at wireless infrastructure applications, the AD7294 multichannel input/output (I/O) data convertor integrates all the functions required for the monitoring and control of current, voltage and temperature in a single chip As output power and channel count grow in wireless basestation designs, the importance of controlling bias current and operating conditions in power transistors increases in order to optimise overall power efficiency, adjacent channel interference and signal-to-noise performance
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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Analog Devices has addressed this need with the AD7294, which provides the complete analogue-to-digital (A/D) and digital-to-analogue (D/A) interfaces required for modern basestation control in CDMA, GSM, Edge and UMTS systems.
In addition, the AD7294 complies with the high-voltage requirements of wireless basestations in a single chip, thus reducing overall component count and cost.
The AD7294 integrates: a four-channel 12bit DAC; a nine-channel 12bit ADC; two high-side current-sense amplifiers; and three temperature sensor channels.
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Combined two-chip solution can reduce the active component count by 60% within a radio design, providing considerable board area and bill of material savings.
As a result, the AD7294 reduces component count and cost, as well as improving reliability and ease-of-use for designers of wireless basestations.
This level of integration was achieved, in part, through a proprietary CMOS process developed at ADI, which combines high-voltage capability with high-speed, low-power convertor cores.
The AD7294 achieves unprecedented levels of accuracy and performance as compared with competing solutions.
The integrated high-side current sensor is compliant with high-voltage requirements, operating up to a maximum of 48V, offering 0.5% accuracy and 1LSB linearity at 12bit, and the temperature sensors offer 0.25C resolution with +/-2C accuracy.
AD7294 designs are less complex than existing solutions, which require an external amplifier for the high-voltage compliance.
In addition, the higher accuracy translates to tighter control of power transistor biasing, thereby achieving better signal integrity and power efficiency in wireless basestations.
The AD7294 is sampling now and will be available in full production quantities in December 2006.
It is priced at $9.00 per unit in 1000-piece quantities and is available in two package options: a 56-lead LFCSP (lead-frame chip-scale package) and a 64-lead TQFP (thin quad flatpack).
Both packages are specified over the extended industrial temperature range (-40 to +105C).
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