Multichannel I/O Data Converter for Wireless Infrastructure Applications

As output power and channel count grow in wireless base station designs, the importance of controlling bias current and operating conditions in power transistors increases in order to optimize overall power efficiency, adjacent channel interference and signal-to-noise performance.

The AD7294 addresses this need by providing the complete A/D and D/A interfaces required for modern base station control in CDMA, GSM, EDGE and UMTS systems. In addition, the AD7294 complies with the high-voltage requirements of wireless base stations in a single chip, thus reducing overall component count and cost.

The AD7294 integrates a 4-channel, 12-bit DAC; a 9-channel, 12-bit ADC; two high-side current-sense amplifiers; and three temperature sensor channels. As a result, the AD7294 reduces component count and cost, as well as improving reliability and ease-of-use for designers of wireless base stations. The integrated high-side current sensor is compliant with high-voltage requirements, operating up to a maximum of 48 V, offering 0.5 percent accuracy and 1-LSB linearity at 12 bits, while the temperature sensors offer 0.25 degree C resolution with +/–2 degree C accuracy.

The AD7294 is available now. It is priced at $9.00 per unit in 1,000-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 flat pack). Both packages are specified over the extended industrial temperature range (–40 degrees C to +105 degrees C).