AD7729

a FEATURES +3 V Supply Voltage Baseband Serial Port (BSPORT) Differential IRx and QRx ADC Channels Two 15-Bit Sigma-Delta A/D Converters FIR Digital Filters 64 dB SNR Output Word Rate 270.83 kHz Twos Complement Coding On-Chip Offset Calibration Power-Down Mode Auxiliary D/A Converter Auxiliary Serial Port (ASPORT) On-Chip Voltage Reference Low Power 28-Lead TSSOP/28-Lead SOIC APPLICATIONS GSM Basestations Pagers FUNCTIONAL BLOCK DIAGRAM DVDD2 DVDD1 DGND AGND AVDD1 Dual Sigma-Delta ADC with Auxiliary DAC AD7729 GENERAL DESCRIPTION This monolithic 3 V CMOS device is a low power, two-channel, input port with signal conditioning. The receive path is composed of two high performance sigma-delta ADCs with digital filtering. A common bandgap reference feeds the ADCs. A control DAC is included for such functions as AFC. The auxiliary functions can be accessed via the auxiliary port (ASPORT). This device is available in a 28-lead TSSOP package or a 28-lead SOIC package. AVDD2 ASDI ASDIFS ASCLK ASDO ASDOFS ASE AUXILIARY SERIAL INTERFACE 10-BIT AUXDAC AUXDAC BSDI BSDIFS BSCLK BSDO BSDOFS BSE BASEBAND SERIAL INTERFACE OFFSET ADJUST DECIMATION FIR DIGITAL FILTER ⌺⌬ MODULATOR IRxP IRxN OFFSET ADJUST DECIMATION FIR DIGITAL FILTER ⌺⌬ MODULATOR QRxP QRxN DIVIDE BY 2 MCLK RxON RESETB MUX REFERENCE REFCAP REFOUT REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any i...