AD6630

a FEATURES 24 dB Gain 4 dB Noise Figure Easy Match to SAW Filters Output Limiter Adjustable +8.5 dBm to +12 dBm 700 MHz Bandwidth 10 V Single or Dual 5 V Power Supply 300 mW Power Dissipation APPLICATIONS ADC IF Drive Amp Communications Receivers PCS/Cellular Base Stations GSM, CDMA, TDMA Differential, Low Noise IF Gain Block with Output Clamping AD6630 FUNCTIONAL BLOCK DIAGRAM NC 1 NC 2 IP2 3 IP1 4 IP1 5 IP2 6 CLLO 7 CLHI 8 NC = NO CONNECT + + + AD6630 16 15 14 13 12 11 10 9 VCC CD1 OP VEE CMD OP CD2 VCC PRODUCT DESCRIPTION The AD6630 is an IF gain block designed to interface between SAW filters and differential input analog-to-digital converters. The AD6630 has a fixed gain of 24 dB and has been optimized for use with the AD6600 and AD6620 in digitizing narrowband IF carriers in the 70 MHz to 250 MHz range. Taking advantage of the differential nature of SAW filters, the AD6630 has been designed as a differential in/differential out gain block. This architecture allows 100 dB of adjacent channel blocking using low cost SAW filters. The AD6630 provides output limiting for ADC and SAW protection with Ͻ10° phase variation in recovery from overdrive situations. Designed for “narrow-band” cellular/PCS receivers, the high linearity and low noise performance of the AD6630 allows for implementation in a wide range of applications ranging from GSM to CDMA to AMPS. The clamping circuitry also maintains the phase integrity of an overdriven signal. This allows phase demodulation ...