Datasheet AD7729 (Analog Devices)

a
Dual Sigma-Delta ADC with Auxiliary DAC AD7729 FEATURES GENERAL DESCRIPTION +3 V Supply Voltage
This monolithic 3 V CMOS device is a low power, two-channel,
Baseband Serial Port (BSPORT)
input port with signal conditioning. The receive path is com-
Differential IRx and QRx
posed of two high performance sigma-delta ADCs with digital
ADC Channels
filtering. A common bandgap reference feeds the ADCs.
Two 15-Bit Sigma-Delta A/D Converters FIR Digital Filters
A control DAC is included for such functions as AFC. The auxil-
64 dB SNR
iary functions can be accessed via the auxiliary port (ASPORT).
Output Word Rate 270.83 kHz
This device is available in a 28-lead TSSOP package or a
Twos Complement Coding
28-lead SOIC package.
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 AVDD2 ASDI ASDIFS 10-BIT AUXDAC AUXDAC ASCLK AUXILIARY SERIAL ASDO INTERFACE ASDOFS ASE BSDI DECIMATION
SD
IRxP OFFSET FIR DIGITAL ADJUST MODULATOR BSDIFS FILTER IRxN BSCLK BASEBAND SERIAL DECIMATION BSDO INTERFACE QRxP OFFSET
SD
FIR DIGITAL ADJUST MODULATOR QRxN BSDOFS FILTER BSE DIVIDE BY 2 MCLK RxON MUX REFERENCE REFCAP RESETB REFOUT
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