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AD9877ABS
Single Supply Cable Modem/Set Top Box Mixed Signal Front End
REV.A
Mixed-Signal Front End
Set-Top Box,Cable Modem
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Low Cost 3.3 V CMOS MxFE™ for
MCNS-DOCSIS, DVB-, DAVIC-Compliant
Set-Top Box and Cable Modem Applications
232 MHz Quadrature Digital Upconverter
12-Bit Direct IF DAC (TxDAC+®)
Up to 65 MHz Carrier Frequency DDS
Programmable Sampling Clock Rates
Selectable Interpolation Filter
Analog Tx Output Level Adjust
12-Bit, 33 MSPS Direct IF ADC
Dual 8-Bit, 16.5 MSPS Sampling IQ ADCs
Two 12-Bit �-� Auxiliary DACs
Direct Interface to AD8321/AD8325 or AD8322/AD8327
PGA Cable Driver
APPLICATIONS
Cable Modems
Set-Top Boxes
Wireless Modems
GENERAL DESCRIPTIONThe AD9877 is a single-supply cable modem/set-top box
mixed-signal front end. The device contains a transmit path
interpolation filter, a complete quadrature digital upconverter,
and a transmit DAC. The receive path contains a 12-bit ADC
and dual 8-bit ADCs. All internally required clocks and an output
system clock are generated by the PLL from a single crystal or
clock input.
The transmit path interpolation filter provides upsampling factors
of 12� or 16� with an output signal bandwidth as high as 5.8 MHz.
Carrier frequencies up to 65 MHz with 26 bits of frequency tuning
resolution can be generated by the direct digital synthesizer (DDS).
The transmit DAC resolution is 12 bits and can run at sampling
rates as high as 232 MSPS. Analog output scaling from 0 dB to
7.5 dB in 0.5 dB steps is available to preserve SNR when reduced
output levels are required.
The 12-bit ADC has excellent undersampling performance,
allowing it to deliver better than 10 ENOBs with IF inputs up to
70 MHz. The 12-bit IF ADC can sample at a rate up to 33 MHz,
allowing it to process wideband signal inputs.
Two programmable sigma-delta DACs are available and can be used
to control external components, such as variable gain amplifiers
(VGAs) or voltage-controlled tuners.
The AD9877 integrates a CA port that enables a host processor
to control the AD8321/AD8325 or AD8322/AD8327 program-
mable gain amplifier (PGA) cable drivers via the MxFE SPORT.
The AD9877 is available in a 100-lead MQFP package. It offers
enhanced receive path undersampling performance and lower cost,
compared to the pin-compatible AD9873.The AD9877 is specified
over the extended industrial (–40oC to +85oC) temperature range.
MxFE is a trademark of Analog Devices, Inc.
TxDAC+ is a registered trademark of Analog Devices, Inc.
AD9877–SPECIFICATIONSTx DAC CHARACTERISTICS
Tx GAIN CONTROL
(VAS = 3.3 V � 5%, VDS = 3.3 V � 10%, fOSCIN = 27 MHz, fSYSCLK = 216 MHz,
fMCLK = 54 MHz (M = 8 and N = 4). ADC sample frequencies derived from PLL (fMCLK), RSET = 4.02 k�, max. fine gain, 75 � DAC load.)
AD9877
AD9877
SPECIFICATIONS (continued)Specifications subject to change without notice.
EXPLANATION OF TEST LEVELSDevices are 100% production tested at 25ºC and guaranteed
by design and characterization testing for industrial operating
temperature range (–40ºC to +85ºC).Parameter is guaranteed by design and/or characterization
testing.
IIIParameter is a typical value only.
N/ATest level definition is not applicable.
THERMAL CHARACTERISTICS
Thermal Resistance100-Lead MQFP
�JA = 40.5ºC/W
ABSOLUTE MAXIMUM RATINGS*Power Supply (VAVDD, VDVDD, VDRVDD) . . . . . . . . . . . . 3.9V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Digital Inputs . . . . . . . . . . . . . . . –0.3VtoDRVDD+0.3V
Analog Inputs . . . . . . . . . . . . . . . . . –0.3 VtoAVDD+0.3V
Operating Temperature . . . . . . . . . . . . . . . . . –40ºCto+85ºC
Maximum Junction Temperature . . . . . . . . . . . . . . . . 150ºC
Storage Temperature . . . . . . . . . . . . . . . . . . –65ºCto+150ºC
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . 300ºC
*Absolute maximum ratings are limiting values, to be applied individually, and
beyond which the serviceability of the circuit may be impaired. Functional
operability under any of these conditions is not necessarily implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect
device reliability.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the AD9877 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
ORDERING GUIDE
