July 2000
Wideband A/D enables next-generation software radios
Device delivers both 14 bits and 65 Msamples/s
Designed for multichannel, multimode receivers, the AD6644 is claimed to be the first A/D converter to deliver both 14 bits and 65 Msamples/s. According to the company, the device makes possible a new receiver architecture that will deliver enhanced voice and data services over cellular and PCS bands.
The AD6644 wideband A/D converter accurately digitizes multiple channels of all 2G and 3G air signals with extremely low noise and distortion.
The device converts wideband analog signals of 200-MHz input bandwidth with low noise (74 dB) and distortion (100 dB SFDR). This performance allows complex functions like filtering to be performed digitally, thus eliminating the expensive analog filters that require adjustment during the system - manufacturing process. As a result, software radios using the AD6644 will be smaller and less costly, as well as more easily reprogrammed and reconfigured for new air standards services.
Other specifications include a sampling jitter of less than 300
fs and a 1.3-W power dissipation. A
40-Msample/s version of the AD6644 is also available. The device is
housed in a 52-pin LQFP
specified from –25° to +85°C. ($39 ea/1,000)
Analog Devices
Norwood, MA
