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AD9975ABSTRL bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD9975ABSTRL bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 20 page REV. 0 a 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 www.analog.com Fax: 781/326-8703 © 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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