FEATURES
On-Chip Regulator PLL Demodulator On-Chip VCO No Trims Excellent Sensitivity 28-Lead SSOP Package APPLICATIONS
DECT/PWT/WLAN TDMA FM/FSK Systems IFIN IF Transceiver Subsystem AD6402 FUNCTIONAL BLOCK DIAGRAM RSSI LIMITER/FILTER PLL DEMOD TXOUT TXOUTB 2 CFILT DOUT DFILP AD6402 VCO IF VCO DC OFFSET COMP MODE CONTROL 1 PLLOUT REFSEL COFF REFIN VOLTAGE REGULATOR FMMOD2 VREF FMMOD1 GENERAL DESCRIPTION
The AD6402 operates directly from an unregulated battery supply of 3.1 V to 4.5 V and provides a regulated voltage output which can be used for VCO supply regulation on a companion RF chip such as the AD6401. The AD6402 transceiver consists of a mixer, integrated IF bandpass filter, IF limiter with RSSI detection, VCO, PLL demodulator and a low dropout voltage regulator. On receive, it downconverts an IF signal in the 110 MHz range to a second IF frequency, this frequency being determined by the demodulator reference divide ratios. It then filters, amplifies, and demodulates this signal.
Analog Devices
