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AD8018 데이터시트(PDF) 1 Page - Analog Devices |
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AD8018 데이터시트(HTML) 1 Page - Analog Devices |
1 / 19 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD8018 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 5 V, Rail-to-Rail, High-Output Current, xDSL Line Drive Amplifier FEATURES Ideal xDSL Line Drive Amplifier for USB, PCMCIA, or PCI-Based Customer Premise Equipment (CPE). The AD8018 provides maximum reach on 5 V supply, driving 16 dBm of power into a back-terminated, transformer-coupled 100 while maintaining –82 dBc of out-of-band SFDR. Rail-to-Rail Output Voltage and High Output Current Drive 400 mA Output Current into Differential Load of 10 @ 8 V p-p Low Single-Tone Distortion –86 dBc Worst Harmonic, 6 V p-p into Differential 10 @ 100 kHz Low Noise 4.5 nV/ √Hz Voltage Noise Density, 100 kHz Out-of-Band SFDR = –82 dBc, 144 kHz to 500 kHz, RLOAD = 12.5 , PLINE = 13 dBm Low-Power Operation 3.3 V to 8 V Power Supply Range Two Logic Bits for Standby and Shutdown Low Supply Current of 9 mA/Amplifier (Typ) Current Feedback Amplifiers High Speed 130 MHz Bandwidth (–3 dB) 300 V/ s Slew Rate APPLICATIONS xDSL USB, PCI, PCMCIA Cards Consumer DSL Modems Twisted Pair Line Driver PRODUCT DESCRIPTION The AD8018 is intended for use in single-supply (5 V) xDSL modems where high-output current and low distortion are essential to achieve maximum reach. The dual high-speed amplifiers are capable of driving low distortion signals to within 0.5 V of the power supply rail. Each amplifier can drive 400 mA of current into 10 Ω (differential) while maintaining –82 dBc out-of-band SFDR. The AD8018 is available with flexible standby and shutdown modes. Two digital logic bits (PWDN1 and PWDN0) may be used to put the AD8018 into one of three modes: full power, standby (outputs low impedance), and shutdown (outputs high impedance). Fabricated with ADI’s high-speed XFCB (eXtra Fast Comple- mentary Bipolar) process, the high bandwidth and fast slew rate of the AD8018 keep distortion to a minimum, while dissipat- ing a minimum of power. The quiescent current of the AD8018 is a low 9 mA/amplifier. The AD8018 drive capability comes in compact 8-lead Thermal Coastline SOIC and 14-lead TSSOP packages. Low-distortion, rail-to-rail output voltage, and high- current drive in small packages make the AD8018 ideal for use in low-cost USB, PCMCIA, and PCI Customer Premise Equip- ment for ADSL, SDSL, VDSL, and proprietary xDSL systems. Both models will operate over the temperature range –40 °C to +85 °C. 10 1nF 5V 750 VIN 10 1nF 750 750 0.01 F 0.01 F VREF 0.01 F 100 100 10k 10k POUT 16dBm R1 3.1 R2 3.1 RL = 100 LINE- POWER 13dBm TRANSFORMER 1:4 10k 10k Figure 2. Single-Supply Voltage Differential Drive Circuit for xDSL Applications 8-Lead SOIC (Thermal Coastline) VS –IN2 IN2 6 5 7 8 OUT2 OUT1 –IN1 IN1 –VS 1 2 3 4 AD8018AR PIN CONFIGURATIONS 14-Lead TSSOP OUT1 –IN1 IN1 –VS PWDN1 VS OUT2 –IN2 IN2 PWDN0 DGND AD8018ARU 6 5 7 8 1 2 3 4 9 14 13 12 11 10 NC NC NC NC = NO CONNECT PLINE – dBm –70 –80 –90 –60 –50 –40 –30 418 6 8 10 12 14 16 N = 4.0 VS = 3.3V VS = 5V VS = 8V Figure 1. Out-of-Band SFDR vs. ADSL Upstream Line Power; VS = 5 V, N = 4 Turns, 144 kHz to 500 kHz. See Evaluation Board Schematics in Figure 11. |
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