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AD9975BST
Integrated Single Supply Broadband Modem Mixed Signal Front End (MxFE™)
REV.0
Broadband Modem
Mixed-Signal Front End
FEATURES
Low Cost, 3.3 V-CMOS, Mixed Signal, Front End
Converter for Broadband Modems
10-Bit D/A Converter (TxDAC+®)
50 MSPS Input Word Rate
2� Interpolating Low-Pass Transmit Filter
100 MSPS DAC Output Update Rate
Wide (21 MHz) Transmit Bandwidth
Power-Down Modes
10-Bit, 50 MSPS A/D Converter
Fourth Order LPF with Selectable Cutoff Frequency
Dual Mode Programmable Gain Amplifier
Internal Clock Multiplier (PLL)
Two Auxiliary Clock Outputs
48-Lead LQFP Package
APPLICATIONS
Powerline Networking
Home Phone Networking
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTIONThe AD9975 is a single-supply, broadband modem, mixed
signal, front end (MxFE™) IC. The device contains a transmit
path interpolation filter and DAC and a receive path PGA,
LPF, and ADC required for a variety of broadband modem
applications. Also on-chip is a PLL clock multiplier that pro-
vides all required clocks from a single crystal or clock input.
The TxDAC+ uses a digital 2× interpolation low-pass filter to
oversample the transmit data and ease the complexity of analog
reconstruction filtering. The transmit path bandwidth is 21 MHz
when sampled at 100 MSPS. The 10-bit DAC provides differen-
tial current outputs. The DAC full-scale current can be adjusted
from 2 to 20 mA by a single resistor, providing 20 dB of additional
gain range.
The receive path consists of a PGA, LPF, and ADC. The program-
mable gain amplifier (PGA) has two modes of operation. One
mode allows programming through the serial port and provides a
gain range from –6 dB to +36 dB in 2 dB steps. The other mode
allows the gain to be controlled through an asynchronous 3-pin
port and offers a gain range from 0 dB to 48 dB in 8 dB steps
with the use of an external gain stage. The receive path LPF
cutoff frequency can be selected to either 12 MHz or 26MHz.
The filter cutoff frequency can also be tuned or bypassed where
filter requirements differ. The 10-bit ADC uses a multistage
differential pipeline architecture to achieve excellent dynamic
performance with low power consumption.
The digital transmit and receive ports are multiplexed onto a
10-bit databus and have individual TX/RX clocks and TX/RX
enable lines. This interface connects directly to Homelug 1.0
PHY/MAC chips from Intellon and Conexant.
The AD9975 is available in a space-saving 48-lead LQFP pack-
age. The device is specified over the commercial (–40°C to
+85°C) temperature range.
TxDAC+ is a registered trademark and MxFE is a trademark of Analog Devices, Inc.
AD9975–SPECIFICATIONSRX PATH INPUT CHARACTERISTICS
(VS = 3.3 V �10%, FOSCIN = 50 MHz, FDAC = 100 MHz, Gain = –6 dB,
RSET = 4.02 k�, 100 � DAC Load.)
AD9975RX PATH LPF (High Cutoff Frequency)
RX PATH DIGITAL HPF
POWER-DOWN/DISABLE TIMING
AD9975
SPECIFICATIONS (continued)CMOS LOGIC INPUTS
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*Power Supply (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Digital Inputs . . . . . . . . . . . . . . . . –0.3 V to DRVDD + 0.3 V
Analog Inputs . . . . . . . . . . . . . . . . . –0.3 V to AVDD + 0.3 V
Operating Temperature . . . . . . . . . . . . . . . . . .–40°C to +85°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . .150°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . . 300°C
*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
EXPLANATION OF TEST LEVELSDevices are 100% production tested at 25°C and guaranteed
by design and characterization testing for the commercial
operating temperature range (–40°C to +85°C).
II.Parameter is guaranteed by design and/or characterization
testing.
III. Parameter is a typical value only.
THERMAL CHARACTERISTICS
Thermal Resistance48-Lead LQFP
θJA = 57ºC/W
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
AD9975 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.
PIN CONFIGURATIONOSC INSENABLESCLKSDATAAVDDAVSSTX+TX–AVSSFS ADJREFIOCLKVDDDRVSSDRVDDRXBOOST/SDOCLKOUT2RXCLKTXCLKTXENRXENADIO0ADIO1ADIO2ADIO3
VSS
GC2
GC1
GC0
CLK
OUT1
ADIO9
ADIO8
ADIO7
ADIO6
ADIO5
ADIO4
VSS
RX–
RX+
VSS
VSS
REFT
REFB
VSS
RESET
PIN FUNCTION DESCRIPTION
ORDERING GUIDE
