Multichannel I/O data converter targets basestations

Norwood, Mass. — Designed for wireless infrastructure applications, this 12-bit multichannel input/output (I/O) data converter from Analog Device Inc. is said to pack all the functions necessary to monitor and control current, voltage and temperature.

ADI's AD7294 provides the complete analog-to-digital (A/D) and digital-to-analog (D/A) interfaces required for modern basestation control and it's suited for bias current control of the power transistors used in power amps employed in CDMA, GSM, EDGE and UMTS
cellular basestations, the company said.

The AD7294 integrates a 4-channel, 12-bit D/A converter; a 9-channel, 12-bit A/D converter; two high-side current-sense amplifiers; and three temperature sensor channels. 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 converter cores.

The integrated high-side current sensor is compliant with high-voltage requirements, operating up to a maximum of 48 volts, offering 0.5 percent accuracy and 1-least significant bit (LSB) linearity at 12 bits, while the temperature sensors offer 0.25°C resolution with ±2°C accuracy. Existing solutions require an external amplifier for the high-voltage compliance, the company said.

The AD7294 I/O converter is sampling now, with production planned for December. The device will have two package options: a 56-lead lead-frame chip-scale package (LFCSP) and a 64-lead thin quad flat pack (TQFP). Both packages are specified over the extended industrial temperature range (-40°C to +105&degC).

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Pricing for the AD7294 I/O data converter is $9.00 per unit in 1,000-piece quantities. Click here for the AD7294 data sheet.

Analog Devices Inc. , 1-800-262-5643,

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