5 V, Rail-to-Rail, High-Output Current, a xDSL Line Drive Amplifier AD8018 FEATURES PIN CONFIGURATIONS Ideal xDSL Line Drive Amplifier for USB, PCMCIA, or 8-Lead SOIC 14-Lead TSSOP PCI-Based Customer Premise Equipment (CPE). The (Thermal Coastline) AD8018 provides maximum reach on 5 V supply, driving 16 dBm of power into a back-terminated, AD8018ARU 14 NC 1 NC transformer-coupled 100 while maintaining 82 dBc AD8018AR 1 8 V 13 OUT1 2 V S OUT1 S of out-of-band SFDR. 12 IN1 3 OUT2 2 7 OUT2 Rail-to-Rail Output Voltage and High Output Current IN1 11 IN1 4 IN2 Drive 3 6 IN2 IN1 10 V 5 IN2 400 mA Output Current into Differential Load of 10 S 4 5 IN2 V PWDN1 6 9 PWDN0 8 V p-p S Low Single-Tone Distortion NC 7 8 DGND 86 dBc Worst Harmonic, 6 V p-p into Differential 10 NC = NO CONNECT 100 kHz PRODUCT DESCRIPTION Low Noise The AD8018 is intended for use in single-supply (5 V) xDSL 4.5 nV/Hz Voltage Noise Density, 100 kHz modems where high-output current and low distortion are Out-of-Band SFDR = 82 dBc, 144 kHz to 500 kHz, essential to achieve maximum reach. The dual high-speed R = 12.5 , P = 13 dBm LOAD LINE amplifiers are capable of driving low distortion signals to within Low-Power Operation 0.5 V of the power supply rail. Each amplifier can drive 400 mA 3.3 V to 8 V Power Supply Range of current into 10 (differential) while maintaining 82 dBc Two Logic Bits for Standby and Shutdown out-of-band SFDR. The AD8018 is available with flexible standby Low Supply Current of 9 mA/Amplifier (Typ) and shutdown modes. Two digital logic bits (PWDN1 and Current Feedback Amplifiers PWDN0) may be used to put the AD8018 into one of three High Speed modes: full power, standby (outputs low impedance), and 130 MHz Bandwidth (3 dB) shutdown (outputs high impedance). 300 V/ s Slew Rate Fabricated with ADIs high-speed XFCB (eXtra Fast Comple- APPLICATIONS mentary Bipolar) process, the high bandwidth and fast slew rate xDSL USB, PCI, PCMCIA Cards of the AD8018 keep distortion to a minimum, while dissipat- Consumer DSL Modems ing a minimum of power. The quiescent current of the AD8018 Twisted Pair Line Driver 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- 30 current drive in small packages make the AD8018 ideal for use in N = 4.0 low-cost USB, PCMCIA, and PCI Customer Premise Equipment 40 for ADSL, SDSL, VDSL, and proprietary xDSL systems. Both V = 5V models will operate over the temperature range 40C to +85C. S 50 V = 3.3V S 5V 1nF 0.01 F 100 60 10 V = 8V S R1 10k 10k 3.1 70 R = 100 L 750 P V OUT LINE- IN V REF 750 16dBm POWER 0.01 F 750 80 13dBm R2 10k 3.1 1:4 90 10 TRANSFORMER 416 8 10 12 14 168 100 0.01 F 10k P dBm 1nF LINE Figure 1. Out-of-Band SFDR vs. ADSL Upstream Line Power Figure 2. Single-Supply Voltage Differential Drive Circuit V = 5 V, N = 4 Turns, 144 kHz to 500 kHz. See Evaluation S for xDSL Applications Board Schematics in Figure 11. REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: ( 25 C, V = 5 V, R = 100 , R = R = 750 unless otherwise noted.) AD8018SPECIFICATIONS S L F G Parameter Conditions Min Typ Max Unit DYNAMIC PERFORMANCE 3 dB Bandwidth G = 1, V < 0.4 V p-p, R = 5 40 50 MHz OUT L G = 1, V < 0.4 V p-p, R = 100 100 130 MHz OUT L G = 2, V < 0.4 V p-p, R = 5 35 40 MHz OUT L G = 2, V < 0.4 V p-p, R = 100 80 100 MHz OUT L 0.1 dB Bandwidth V < 0.4 V p-p, R = 100 10 MHz OUT L Large Signal Bandwidth V = 4 V p-p, G = +2 80 MHz OUT Slew Rate Noninverting, V = 4 V p-p 300 V/ s OUT Rise and Fall Time Noninverting, V = 2 V p-p 5.5 ns OUT Settling Time 0.1%, V = 2 V p-p, R = 100 25 ns OUT L NOISE/HARMONIC PERFORMANCE Distortion, V = 6 V p-p (Differential) OUT Second Harmonic 100 kHz, R = 10 89 94 dBc L 500 kHz, R = 10 61 63 dBc L Third Harmonic 100 kHz, R = 10 86 89 dBc L 500 kHz, R = 10 74 77 dBc L MTPR (In-Band) 25 kHz to 138 kHz, R = 12.5 , P = +13 dBm 70 dBc L LINE SFDR (Out-of-Band) 144 kHz to 500 kHz, R = 12.5 , P = +13 dBm 82 dBc L LINE Input Noise Voltage f = 100 kHz 4.5 5 nVHz Input Noise Current f = 100 kHz (+Inputs) 1 pAHz f = 100 kHz (Inputs) 10 pAHz Crosstalk f = 1 MHz, G = +2 74 dB DC PERFORMANCE Input Offset Voltage 115 mV T to T 17 mV MIN MAX Input Offset Voltage Match 0.1 2.6 mV Transimpedance V = 2 V p-p, R = 5 830 2000 k OUT L T to T 700 k MIN MAX INPUT CHARACTERISTICS Input Resistance +Input 10 M Input 125 Input Capacitance +Input 1 pF Input Bias Current () 0.3 8 A T to T 14 A MIN MAX Input Bias Current () Match 0.1 5.5 A T to T 8 A MIN MAX Input Bias Current (+) 1 1.5 A T to T 2.5 A MIN MAX Input Bias Current (+) Match 0.1 0.5 A T to T 1 A MIN MAX CMRR V 2 V to 4 V 51 54 dB IN Input CM Voltage Range 1.2 3.8 V OUTPUT CHARACTERISTICS Cap Load 30% Overshoot 1000 pF Output Resistance Frequency = 100 kHz, PWDN1, PWDN0 = 1 0.2 Output Voltage Swing R = 100 0.16 to 4.87 V L R = 5 0.5 to 4.5 V L Linear Output Current SFDR < 85 dBc, f = 100 kHz, R = 10 , Differential 350 400 mA L Short-Circuit Current 1000 mA POWER SUPPLY Supply Current/Amp PWDN1 = 1, PWDN0 = 1 9 10 mA T to T 11.4 mA MIN MAX STBY Supply Current/Amp PWDN1 = 0, PWDN0 = 1 or 4.5 5.1 mA PWDN1 = 1, PWDN0 = 0 4.5 5.1 mA SHUTDOWN Supply Current/Amp PWDN1 = 0, PWDN0 = 0 0.3 0.55 mA Operating Range Single Supply 3.3 8 V +Power Supply Rejection Ratio V = 1 V 60 66 dB S T to T 56 dB MIN MAX Power Supply Rejection Ratio V = 1 V 52 55 dB S T to T 50 dB MIN MAX 2 REV. 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