AD8396ACPZ-R2

Low Power, High Output Current, Dual-Port ADSL/ADSL2+ Line Driver AD8396 B SO ADSL/ADSL2+ CO line drivers 13 VOPA 14 VCC INPA 1 12 VONA INNA 2 AD8396 11 DGND DGND 3 TOP VIEW 10 VOPB VONB VEE 8 PD_B 7 INNB 5 VCOM-B 6 TE 9 07022-001 INPB 4 Figure 1. LE APPLICATIONS 16 VCOM-A PIN CONFIGURATION 2 differential DSL channels comprised of current feedback, high output current amplifiers Integrated feedback and gain resistors Integrated biasing network Ideal for use as ADSL/ADSL2+ dual-channel Central Office (CO) line drivers Low power consumption Dual-supply operation from ±6 V to ±12 V Single-supply operation from 12 V to 24 V 10.8 mA quiescent supply current in full power mode 1.4 mA quiescent supply current in shutdown mode Less than 700 mW internal power dissipation while driving 20.4 dBm line power, 1:1 transformer High output voltage and current drive 43.4 V p-p differential output voltage Low distortion −66 dBc typical MTPR @ 20.4 dBm, 26 kHz to 2.2 MHz High speed: 170 V/μs differential slew rate 15 PD_A FEATURES VCC INPA VOPA VCC 4kΩ AV = 13 VCOM-A 4kΩ VEE VONA INNA The AD8396 is comprised of four high output current, low power consumption operational amplifiers. It is particularly well suited for the CO driver interface in digital subscriber line systems, such as ADSL and ADSL2+. The driver can deliver 20.4 dBm to a line while compensating for losses due to hybrid insertion and back-termination resistors. VEE 07022-002 GENERAL DESCRIPTION Figure 2. Channel A Internal Schematics O The low power consumption, high output current, high output voltage swing, and robust thermal packaging enable the AD8396 to be used as the CO line driver in ADSL and other xDSL systems. The AD8396 is available in a 4 mm × 4 mm 16-lead LFCSP. Rev. C 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2007–2009 Analog Devices, Inc. All rights reserved. AD8396 TABLE OF CONTENTS Typical Performance Characteristics ..............................................6  Applications ....................................................................................... 1  Theory of Operation .........................................................................8  General Description ......................................................................... 1  Applications Information .................................................................9  Pin Configuration ............................................................................. 1  Supplies, Grounding, and Layout ................................................9  Revision History ............................................................................... 2  Power Management ......................................................................9  Specifications..................................................................................... 3  Typical ADSL/ADSL2+ Application ...........................................9  Absolute Maximum Ratings............................................................ 4  Multitone Power Ratio (MTPR) ..................................................9  Thermal Resistance ...................................................................... 4  Lightning and AC Power Fault ................................................. 10  Maximum Power Dissipation ..................................................... 4  Outline Dimensions ....................................................................... 11  ESD Caution .................................................................................. 4  Ordering Guide .......................................................................... 11  Pin Configuration and Function Descriptions ............................. 5  REVISION HISTORY O B SO LE 8/09—Revision C: Initial Version TE Features .............................................................................................. 1  Rev. C | Page 2 of 12 AD8396 SPECIFICATIONS (VCC − VEE) = 24 V, RL = 100 Ω, GDIFF = 13 (fixed), PD = (0), T = 25°C, typical DSL application circuit, unless otherwise noted. Table 1. 12.8 8 8 170 13 Max Unit Test Conditions/Comments VOUT = 0.1 V p-p, differential VOUT = 2 V p-p, differential VOUT = 4 V p-p, differential 13.2 MHz MHz V/μs V/V dBc dBc dBc fC = 2 MHz, VOUT = 2 V p-p, differential fC = 2 MHz, VOUT = 2 V p-p, differential 26 kHz to 2.2 MHz, ZLINE = 100 Ω, differential load f = 10 kHz −90 −62 −66 140 −15 −15 −30 −5 42.6 21.3 −100 nV/√Hz −0.7 +0.3 +0.1 −1.5 8 1 +15 +15 +30 +5 mV mV mV μA kΩ pF Single-ended Differential Differential 43.4 21.7 44 22 +100 V p-p V p-p μA ΔVOUT, RL = 100 Ω ΔVOUT, RL = 50 Ω PD = (1) ±12 24 V V 10.8 1.4 +0.2 13.0 3.0 +10 0.8 −47 +1 −80 −80 +100 +100 −60 −60 mA mA mV V V μA μA dB dB O B SO RTO Offset Voltage @ PD = (1) Input Bias Current Input Resistance Input Capacitance OUTPUT CHARACTERISTICS Differential Output Voltage Swing Single-Ended Output Voltage Swing Output Leakage Current POWER SUPPLY Operating Range, Dual Supply Operating Range, Single Supply Total Quiescent Current PD = (0) PD = (1) Shutdown State Common-Mode Voltage PD = (0) Threshold PD = (1) Threshold PD = (0) Input Current PD = (1) Input Current +Power Supply Rejection Ratio −Power Supply Rejection Ratio Typ TE Differential Output Noise INPUT CHARACTERISTICS RTO Offset Voltage Min LE Parameter DYNAMIC PERFORMANCE −3 dB Small-Signal Bandwidth −3 dB Large-Signal Bandwidth Slew Rate Differential Gain NOISE/DISTORTION PERFORMANCE Second Harmonic Distortion Third Harmonic Distortion Multitone Input Power Ratio (MTPR) ±6 12 9.0 0 −10 1.6 −100 −100 Rev. C | Page 3 of 12 Differential Differential VCM (0) = 0 V (1) = 5 V (0) = 0 V (1) = 5 V ΔVOS, DM (RTI)/ΔVCC, ΔVCC = ±1 V, differential ΔVOS, DM (RTI)/ΔVEE, ΔVEE = ±1 V, differential AD8396 ABSOLUTE MAXIMUM RATINGS Rating 26.4 V See Figure 3 −65°C to +150°C −40°C to +85°C 300°C 150°C 3.5 TJ = 150°C 2.5 2.0 1.5 TE Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 3.0 1.0 0.5 0 –25 –15 –5 5 15 25 35 45 55 07022-003 Parameter Supply Voltage, VCC − VEE Power Dissipation Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) Junction Temperature Figure 3 shows the maximum power dissipation in the package vs. the ambient temperature for the 16-lead LFCSP on a JEDEC standard 4-layer board. θJA values are approximations. MAXIMUM POWER DISSIPATION (W) Table 2. 65 75 85 AMBIENT TEMPERATURE (°C) THERMAL RESISTANCE Figure 3. Maximum Power Dissipation vs. Ambient Temperature for a 4-Layer Board LE θJA is specified in still air with exposed pad soldered to 4-layer JEDEC test board. θJC is specified at the exposed pad. MAXIMUM POWER DISSIPATION The power dissipated in the package (PD) is the sum of the quiescent power dissipation and the power dissipated in the package due to the load drive for all outputs. The quiescent power is the voltage between the supply pins (VS) times the quiescent current (IS). Assuming that the load RL is referenced to midsupply, the total drive power is VS/2 × IOUT, part of which is dissipated in the package and part in the load (VOUT × IOUT). The maximum safe power dissipation for the AD8396 is limited by its junction temperature on the die. RMS output voltages should be considered. If RL is referenced to VEE, as in single-supply operation, the total power is VS × IOUT. The maximum safe junction temperature of plastic encapsulated devices, as determined by the glass transition temperature of the plastic, is 150°C. Exceeding this limit can temporarily cause a shift in the parametric performance due to a change in the stresses exerted on the die by the package. Exceeding this limit for an extended period can result in device failure. In single supply with RL to VEE, worst case is VOUT = VS/2. Table 3. θJA 56 θJC 9.1 Unit °C/W O B SO Package Type 16-Lead LFCSP Airflow increases heat dissipation, effectively reducing θJA. In addition, more copper in direct contact with the package leads from PCB traces, through-holes, ground, and power planes reduces θJA. ESD CAUTION Rev. C | Page 4 of 12 AD8396 13 VOPA 14 VCC 16 VCOM-A 15 PD_A PIN CONFIGURATION AND FUNCTION DESCRIPTIONS INPA 1 12 VONA INNA 2 AD8396 11 DGND DGND 3 TOP VIEW 10 VOPB VONB TE VEE 8 PD_B 7 INNB 5 VCOM-B 6 9 NOTE THE EXPOSED PAD IS NOT CONNECTED INTERNALLY. FOR INCREASED RELIABILITY OF THE SOLDER JOINTS AND MAXIMUM THERMAL CAPABILITY IT IS RECOMMENDED THAT THE PAD BE SOLDERED TO THE GROUND PLANE. 07022-004 INPB 4 Table 4. Pin Function Descriptions Description Port A Input P Port A Input N Ground Port B Input P Port B Input N Port B Bias Port B Shutdown Negative Power Supply Port B Output N Port B Output P Port A Output N Port A Output P Positive Power Supply Port A Shutdown Port A Bias No Connection B SO Mnemonic INPA INNA DGND INPB INNB VCOM-B PD_B VEE VONB VOPB VONA VOPA VCC PD_A VCOM-A O Pin No. 1 2 3, 11 4 5 6 7 8 9 10 12 13 14 15 16 Exposed Pad LE Figure 4. Pin Configuration Rev. C | Page 5 of 12 AD8396 TYPICAL PERFORMANCE CHARACTERISTICS 2 –30 1 –40 –50 –1 –2 CROSSTALK (dB) NORMALIZED GAIN (dB) 0 0.1V p-p –3 –4 –5 2V p-p –60 –70 –80 –6 1 –100 0.01 100 10 FREQUENCY (MHz) Figure 8. Crosstalk vs. Frequency, Typical ADSL/ADSL2+ Application Circuit, VOUT = 2 V p-p, RL = 100 Ω 45 LE PD PULSE 5 35 1.5 4 30 1.0 3 VPD (V) 25 20 15 10 07022-006 5 B SO OUTPUT SWING (V p-p) 2.0 6 40 0 10 20 30 40 50 60 70 80 90 100 2 0.5 OUTPUT –0.5 0 –1.0 –1 –1.5 –2 0 2 4 6 8 900 O 800 10 12 14 16 18 –2.0 20 TIME (μs) Figure 9. Power-Down/Power-Up Transition Figure 6. DC Differential Output Swing vs. Load 1000 0 1 LOAD (Ω) 160 140 120 NOISE (nV/ Hz) 700 600 500 400 100 80 60 300 40 200 0 10 20 07022-007 100 12 14 16 18 20 0 0.01 22 07022-010 INTERNAL POWER CONSUMPTION (mW) 10 1 FREQUENCY (MHz) Figure 5. Differential Gain vs. Frequency, RL = 100 Ω 0 0.1 VOUT (V) 0.1 0.1 1 FREQUENCY (MHz) OUTPUT POWER (dBm) Figure 7. Internal Power Consumption vs. Output Power, Typical ADSL/ADSL2+ Application Circuit, 100 Ω Resistive Load Only Figure 10. Differential Output Noise vs. Frequency, Typical ADSL/ADSL2+ Application Circuit Rev. C | Page 6 of 12 10 07022-009 0 07022-008 TE –8 –90 07022-005 –7 AD8396 20 –40 VS = ±12V –50 VS = ±10V FEEDTHROUGH (dB) 10 5 0 –5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 –80 –90 –110 0.1 2.0 1 TE 0 –70 –100 07022-011 –10 –60 07022-012 AMPLITUDE (V) 15 FREQUENCY (MHz) TIME (μs) Figure 12. Feedthrough vs. Frequency, Typical ADSL/ADSL2+ Application Circuit, VOUT = 2 V p-p, RL = 100 Ω O B SO LE Figure 11. Output Overdrive Recovery, Typical ADSL/ADSL2+ Application Circuit, VOUT = 3.3 VRMS, CF = 5.47, RL = 100 Ω Rev. C | Page 7 of 12 10 AD8396 THEORY OF OPERATION The AD8396 is a current feedback amplifier with high output current capability. With a current feedback amplifier, the current into the inverting input is the feedback signal, and the open-loop behavior is that of a transimpedance, dVO/dIIN or TZ. The open-loop transimpedance is analogous to the open-loop voltage gain of a voltage feedback amplifier. Figure 13 shows a simplified model of a current feedback amplifier. Because RIN is proportional to 1/gm, the equivalent voltage gain is TZ × gm, where gm is the transconductance of the input stage. Basic analysis of the follower with the gain circuit yields Because G × RIN