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參數資料
| 型號： | AD9975ABST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調制器/解調器 |
| 英文描述： | Broadband Modem Mixed-Signal Front End |
| 中文描述： | MODEM-SUPPORT CIRCUIT, PQFP48 |
| 封裝： | 1.40 MM HEIGHT, PLASTIC, MS-026BBC, LQFP-48 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 1392K |
| 代理商： | AD9975ABST |
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Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
Analog Devices, Inc., 2002
AD9975
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
TXEN
RXEN
TXCLK
RXCLK
ADIO[9:0]
SPORT
OSCIN
XTAL
AD9975
PGA
LPF
PGA
ADC
REGISTER
CONTROL
3
3
10
CLK-GEN
TxDAC+
K
10
10
AGC[2:0]
TX+
TX–
CLK1
CLK2
RX+
RX–
GENERAL DESCRIPTION
The 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 26 MHz.
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.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9975ABSTEB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Broadband Modem Mixed-Signal Front End |
| AD9975ABSTRL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Broadband Modem Mixed-Signal Front End |
| AD9975BST | 制造商:Analog Devices 功能描述:Mixed Signal Front End 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:10 BIT ANALOG FRONT END WITH HALF DUPLEX - Tape and Reel |
| AD9975BSTRL | 制造商:Analog Devices 功能描述:Mixed Signal Front End 48-Pin LQFP T/R |
| AD9975BSTZ | 制造商:Analog Devices 功能描述:Mixed Signal Front End 48-Pin LQFP |
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