Dual Sigma-Delta ADC with Auxiliary DAC
Description
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
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, 1998
1 (AVDD1 = AVDD2 = +3 V ؎ 10%; DVDD1 = DVDD2 = +3 V ؎ 10%; DGND = AGND = AD7729–SPECIFICATIONS 0 V, f = 13 MHz; RxPOWER1 = 0; RxPOWER0...
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