AD7729ARZ Datasheet, PDF (1/16 Pages) Analog Devices – Dual Sigma-Delta ADC with Auxiliary DAC

a
Dual Sigma-Delta ADC
with Auxiliary DAC
AD7729
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
GENERAL DESCRIPTION
This monolithic 3 V CMOS device is a low power, two-channel,
input port with signal conditioning. The receive path is com-
posed 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 auxil-
iary 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.
FUNCTIONAL BLOCK DIAGRAM
DVDD2
DVDD1 DGND
AGND AVDD1
AVDD2
ASDI
ASDIFS
ASCLK
ASDO
ASDOFS
ASE
BSDI
BSDIFS
BSCLK
BSDO
BSDOFS
BSE
MCLK
RxON
RESETB
AUXILIARY
SERIAL
INTERFACE
10-BIT
AUXDAC
BASEBAND
SERIAL
INTERFACE
OFFSET
ADJUST
OFFSET
ADJUST
DECIMATION
FIR DIGITAL
FILTER
DECIMATION
FIR DIGITAL
FILTER
⌺⌬
MODULATOR
⌺⌬
MODULATOR
DIVIDE BY 2
MUX
REFERENCE
AUXDAC
IRxP
IRxN
QRxP
QRxN
REFCAP
REFOUT
REV. 0
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which may result from its use. No license is granted by implication or
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© Analog Devices, Inc., 1998