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AD8326ARP-REEL Arkusz danych(PDF) 1 Page - Analog Devices |
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AD8326ARP-REEL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 24 page REV. 0 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. a AD8326 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., 2001 High Output Power Programmable CATV Line Driver FUNCTIONAL BLOCK DIAGRAM DIFF OR SINGLE INPUT AMP ATTENUATION CORE ZOUT DIFF = 75 8 8 8 ZIN (SINGLE) = 800 ZIN (DIFF) = 1.6k AD8326 DATEN DATA CLK VEE (10 PINS) TXEN SLEEP VOUT+ VOUT– VCC (7 PINS) VIN+ VIN– VERNIER DECODE DATA LATCH SHIFT REGISTER POWER-DOWN LOGIC POWER AMP BYP GND FEATURES Supports DOCSIS Standard for Reverse Path Transmission Gain Programmable in 0.75 dB Steps over a 53.5 dB Range Low Distortion at 65 dBmV Output –62 dBc SFDR at 21 MHz –58 dBc SFDR at 65 MHz 1 dB Compression of 25 dBm at 10 MHz Output Noise Level –45 dBmV in 160 kHz Maintains 75 Output Impedance Power-Up and Power-Down Condition Upper Bandwidth: 100 MHz (Full Gain Range) Single or Dual Supply Operation APPLICATIONS Gain-Programmable Line Driver CATV Telephony Modems CATV Terminal Devices General-Purpose Digitally Controlled Variable Gain Block –40 –45 –50 –55 –60 –65 –70 –75 –80 5 15 25 35 45 55 65 FREQUENCY – MHz ARP(VS = +12V) ARE(VS = 5V) ARP(VO = 69dBmV) ARP(VO = 67dBmV) ARE(VO = 65dBmV) ARE(VO = 62dBmV) Figure 1. Worst Harmonic Distortion vs. Frequency GENERAL DESCRIPTION The AD8326 is a high-output power, digitally controlled, vari- able gain amplifier optimized for coaxial line driving applications such as data and telephony cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 53.5 dB range result- ing in gain changes of 0.75 dB/LSB. The AD8326 is offered in two models, each optimized to support the desired output power and resulting performance. The AD8326 comprises a digitally controlled variable attenuator of 0 dB to –54 dB, that is preceded by a low noise, fixed-gain buffer and is followed by a low distortion high-power amplifier. The AD8326 accepts a differential or single-ended input signal. The output is designed to drive a 75 Ω load, such as coaxial cable, although the AD8326 is capable of driving other loads. When driving 67 dBm into a 75 Ω load, the AD8326ARP provides a worst harmonic of only –59 dBc at 21 MHz and –57 dBc at 42 MHz. When driving 65 dBmV into a 75 Ω load, the AD8326ARE provides a worst harmonic of only –62 dBc at 21 MHz and –60 dBc at 42 MHz. The differential output of the AD8326 is compliant with DOCSIS paragraph 4.2.10.2 for “Spurious Emissions During Burst On/Off Transients.” In addition, this device has a sleep mode function that reduces the quiescent current to 4 mA. The AD8326 is packaged in a low-cost 28-lead TSSOP and a 28-lead P (power) SOIC. Both devices have an operational tem- perature range of –40 °C to +85°C. |
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