EL1507CLZ

EL1507 ® Data Sheet March 26, 2007 Medium Power Differential Line Driver Features The EL1507 is a very low power dual operational amplifier designed for central office and customer premise line driving for DMT ADSL solutions. This device features a high drive capability of 400mA while consuming only 7.5mA of supply current per amplifier from ±12V supplies. This driver achieves a typical distortion of less than -75dBc, at 1MHz into a 50Ω load. The EL1507 is available in the thermallyenhanced 16 Ld SO package, as well as a 16 Ld QFN package. Both are specified for operation over the full -40°C to +85°C temperature range. • Drives 360mA at 16VP-P on ±12V supplies • 40VP-P differential output drive into 100Ω • -75dBc typical driver output distortion driving 50Ω at 1MHz and 1/2-IS bias current • Low quiescent current of 3.5mA per amplifier in 1/2-IS mode • Power down disable mode • Pb-free plus anneal available (RoHS compliant) The EL1507 has two control pins, C0 and C1. With the selection of C0 and C1, the device can be set into full-IS power, ¾-IS power, ½-IS power, and power down disable modes. The EL1507 maintains excellent distortion and load driving capabilities even in the lowest power settings. Applications Ordering Information • Video distribution amplifier PART NUMBER PART MARKING TAPE & REEL PACKAGE PKG. DWG. # EL1507CS EL1507CS - 16 Ld SOIC MDP0027 EL1507CS-T7 EL1507CS 7” 16 Ld SOIC MDP0027 EL1507CS-T13 EL1507CS 13” 16 Ld SOIC MDP0027 EL1507CSZ (See Note) EL1507CSZ - 16 Ld SOIC MDP0027 (Pb-Free) EL1507CSZ-T7 (See Note) EL1507CSZ 7” 16 Ld SOIC MDP0027 (Pb-Free) EL1507CSZ-T13 EL1507CSZ (See Note) 13” 16 Ld SOIC MDP0027 (Pb-Free) EL1507CL 1507CL - 16 Ld QFN MDP0046 EL1507CL-T7 1507CL 7” 16 Ld QFN MDP0046 EL1507CL-T13 1507CL 13” 16 Ld QFN MDP0046 EL1507CLZ (See Note) 1507CLZ - 16 Ld QFN (Pb-Free) MDP0046 EL1507CLZ-T7 (See Note) 1507CLZ 7” 16 Ld QFN (Pb-Free) MDP0046 EL1507CL-T13 (See Note) 1507CLZ 13” 16 Ld QFN (Pb-Free) MDP0046 FN7013.3 • ADSL G.DMT and G.lite CO line driving • G.SHDSL, HDSL2 line driver • ADSL CPE line driving • Video twisted-pair line driver NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2001, 2005-2007. All Rights Reserved All other trademarks mentioned are the property of their respective owners. EL1507 Pinouts 13 OUTB 14 VS+ 15 VOUTB VIN-A 3 14 VIN-B 1 GND* 4 13 GND* INA- 2 GND* 5 12 GND* VIN+A 6 11 VIN+B GND 7 VS- 8 INA+ 3 12 + AMP A GND 4 10 C1 9 11 INB10 INB+ 9 C1 5 POWER CONTROL LOGIC + AMP B C0 8 + - + 6 6 2 16 VS+ VS- 7 VOUTA 16 OUTA 1 - NC 15 EL1507 (16 LD QFN) TOP VIEW EL1507 (16 LD SO) TOP VIEW C0 NOTE: *These GND Pins are heat spreaders 2 FN7013.3 March 26, 2007 EL1507 Absolute Maximum Ratings (TA = +25°C) Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA Operating Temperature Range . . . . . . . . . . . . . . . . .-40°C to +85°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-60°C to +150°C Operating Junction Temperature . . . . . . . . . . . . . . .-40°C to +150°C Power Dissipation . . . . . .See Power Supplies & Dissipation section VS+ to VS- Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.4V VS+ Voltage to Ground . . . . . . . . . . . . . . . . . . . . . . -0.3V to +26.4V VS- Voltage to Ground . . . . . . . . . . . . . . . . . . . . . . . . -26.4V to 0.3V Input C0/C1 to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7V VIN+ Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VS- to VS+ Current Into Any Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8mA CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA Electrical Specifications PARAMETER VS = ±12V, RF= 1.5kΩ, RL= 75Ω to GND, TA = +25°C. unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP MAX UNIT AC PERFORMANCE BW -3dB Bandwidth AV = +4 70 MHz HD Total Harmonic Distortion f = 1MHz, VO = 16VP-P, RL = 50Ω -75 dBc dG Differential Gain AV = +2, RL = 37.5Ω 0.17 % dθ Differential Phase AV = +2, RL = 37.5Ω 0.1 ° SR Slew Rate VOUT from -4.5V to +4.5V 500 V/µs 350 DC PERFORMANCE VOS Offset Voltage -17 17 mV ΔVOS VOS Mismatch -10 10 mV ROL Transimpedance 3.5 MΩ VOUT from -4.5V to +4.5V 1 2 INPUT CHARACTERISTICS IB+ Non-Inverting Input Bias Current -5 5 µA IB- Inverting Input Bias Current -30 30 µA ΔIB- IB- Mismatch -20 20 µA eN Input Noise Voltage 2.8 nV/√ Hz iN+ +Input Noise Current 1.8 pA/√ Hz iN- -Input Noise Current 19 pA/√ Hz VIH Input High Voltage C0 & C1 inputs VIL Input Low Voltage C0 & C1 inputs IIH1 Input High Current for C1 C1 = 5V IIH0 Input High Current for C0 IIL Input Low Current for C1 or C0 2.3 V 1.5 V 0.2 8 µA C0 = 5V 0.1 4 µA C1 = 0V, C0 = 0V -1 1 µA OUTPUT CHARACTERISTICS VOUT Loaded Output Swing Single Ended RL = 100Ω to GND ±10.3 ±10.9 V VOUT P Loaded Output Swing Single Ended RL = 25Ω to GND 9.5 10.2 V VOUT N Loaded Output Swing Single Ended RL = 25Ω to GND -8.2 -9.8 V IOUT Output Current RL = 0Ω 500 mA VS Supply Voltage Single supply IS+ (Full Power) Positive Supply Current per Amplifier All outputs at 0V, C0 = C1 = 0V SUPPLY 3 5 7.5 24 V 9 mA FN7013.3 March 26, 2007 EL1507 Electrical Specifications PARAMETER VS = ±12V, RF= 1.5kΩ, RL= 75Ω to GND, TA = +25°C. unless otherwise specified. (Continued) DESCRIPTION CONDITIONS MIN TYP MAX UNIT IS- (Full Power) Negative Supply Current per Amplifier All outputs at 0V, C0 = C1 = 0V -7 -8.5 mA IS+ (3/4 Power) Positive Supply Current per Amplifier 6 7.5 mA IS- (3/4 Power) Negative Supply Current per Amplifier All outputs at 0V, C0 = 5V, C1 = 0V -5.5 -7 mA IS+ (1/2 Power) Positive Supply Current per Amplifier All outputs at 0V, C0 = 0V, C1 = 5V 3.9 5.1 mA IS- (1/2 Power) Negative Supply Current per Amplifier All outputs at 0V, C0 = 0V, C1 = 5V -3.3 -4.6 mA IS+ (Power Down) Positive Supply Current per Amplifier 0.6 1 mA IS- (Power Down) Negative Supply Current per Amplifier All outputs at 0V, C0 = C1 = 5V 0 0.75 mA IGND GND Supply Current per Amplifier 0.6 1 mA All outputs at 0V, C0 = 5V, C1 = 0V All outputs at 0V, C0 = C1 = 5V All outputs at 0V Typical Performance Curves GAIN (dB) 24 22 VS=±12V AV=10 RL=100Ω VS=±12V AV=5 18 RL=100Ω 1kΩ 20 1.5kΩ 16 GAIN (dB) 28 1kΩ 14 1.5kΩ 10 2kΩ 2kΩ 12 6 8 100K 1M 10M 2 100K 100M FREQUENCY (Hz) 22 VS=±12V AV=10 RL=100Ω 18 1kΩ 20 1.5kΩ 16 VS=±12V AV=5 RL=100Ω 1kΩ 14 1.5kΩ 10 2kΩ 2kΩ 12 8 100K 100M FIGURE 2. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CS - FULL POWER MODE) GAIN (dB) GAIN (dB) 24 10M FREQUENCY (Hz) FIGURE 1. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CS - FULL POWER MODE) 28 1M 6 1M 10M 100M FREQUENCY (Hz) FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CS - 3/4 POWER MODE) 4 2 100K 1M 10M 100M FREQUENCY (Hz) FIGURE 4. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CS - 3/4 POWER MODE) FN7013.3 March 26, 2007 EL1507 Typical Performance Curves 28 22 VS=±12V AV=5 18 RL=100Ω VS=±12V AV=10 24 RL=100Ω 1kΩ 1kΩ 20 GAIN (dB) GAIN (dB) 1.5kΩ 1.5kΩ 16 14 2kΩ 10 2kΩ 12 6 8 100K 1M 10M 2 100K 100M FREQUENCY (Hz) 22 VS=±12V AV=10 RL=100Ω 18 1kΩ 20 1.5kΩ 16 VS=±12V AV=5 RL=100Ω 1kΩ 14 1.5kΩ 10 2kΩ 2kΩ 12 8 100K 6 1M 10M 2 100K 100M 1M 10M FIGURE 7. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CL - FULL POWER MODE) FIGURE 8. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CL - FULL POWER MODE) 22 28 VS=±12V AV=10 24 RL=100Ω 18 VS=±12V AV=5 RL=100Ω 1.5kΩ 16 GAIN (dB) 1kΩ 1kΩ 20 14 1.5kΩ 10 2kΩ 2kΩ 6 12 8 100K 100M FREQUENCY (Hz) FREQUENCY (Hz) GAIN (dB) 100M FIGURE 6. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CS - 1/2 POWER MODE) GAIN (dB) GAIN (dB) 24 10M FREQUENCY (Hz) FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CS - 1/2 POWER MODE) 28 1M 1M 10M 100M FREQUENCY (Hz) FIGURE 9. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CL - 3/4 POWER MODE) 5 2 100K 1M 10M 100M FREQUENCY (Hz) FIGURE 10. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CL - 3/4 POWER MODE) FN7013.3 March 26, 2007 EL1507 Typical Performance Curves 28 VS=±12V AV=5 18 RL=100Ω 1kΩ 20 1.5kΩ 16 GAIN (dB) GAIN (dB) 24 22 VS=±12V AV=10 RL=100Ω 1kΩ 1.5kΩ 14 2kΩ 10 2kΩ 12 6 8 100K 1M 10M 2 100K 100M FREQUENCY (Hz) 22 22pF 10pF 14 GAIN (dB) GAIN (dB) 22 0pF 6 -2 VS=±12V AV=5 RL=100Ω RF=1.5kΩ 1M 10M 0pF 6 -10 100K 100M GAIN (dB) 10pF 14 0pF -2 -10 100K 22 22pF 6 10M 100M FIGURE 14. FREQUENCY RESPONSE vs CLOAD (EL1507CL - FULL POWER MODE) 30 VS=±12V AV=5 RL=100Ω RF=1.5kΩ 1M FREQUENCY (Hz) FIGURE 13. FREQUENCY RESPONSE vs CLOAD (EL1507CS - FULL POWER MODE) GAIN (dB) 10pF 14 FREQUENCY (Hz) 22 22pF -2 -10 100K 30 100M FIGURE 12. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CL - 1/2 POWER MODE) 30 VS=±12V AV=5 RL=100Ω RF=1.5kΩ 10M FREQUENCY (Hz) FIGURE 11. DIFFERENTIAL FREQUENCY RESPONSE vs RF (EL1507CL - 1/2 POWER MODE) 30 1M VS=±12V AV=5 RL=100Ω RF=1.5kΩ 22pF 10pF 14 0pF 6 -2 1M 10M 100M FREQUENCY (Hz) FIGURE 15. FREQUENCY RESPONSE vs CLOAD (EL1507CS - 3/4 POWER MODE) 6 -10 100K 1M 10M 100M FREQUENCY (Hz) FIGURE 16. FREQUENCY RESPONSE vs CLOAD (EL1507CL - 3/4 POWER MODE) FN7013.3 March 26, 2007 EL1507 Typical Performance Curves 30 22pF 22 10pF 0pF GAIN (dB) 22 GAIN (dB) 30 VS=±12V AV=5 RL=100Ω RF=1.5kΩ 14 6 -2 VS=±12V AV=5 RL=100Ω RF=1.5kΩ 14 0pF 6 -2 -10 100K 1M 10M -10 100K 100M 1M FREQUENCY (Hz) AV=5, RF=1.5kΩ, 50 FULL PO 45 FU 40 3/4 PO LL P OW 1 /2 P 35 WE 3/4 PO W ER OW -50 R -60 WE R ER 6 -65 HD3 -70 HD2 -75 ER 1/2 P 7 OW E R -80 8 9 10 11 HD2 HD3 -85 -90 12 2 10 ±VS (V) 16 14 -50 -60 HD (dB) IS (mA) 12 10 8 -65 IS- (1/2 POWER) 2 IS- (3/4 POWER) 2 4 6 8 10 12 ±VS (V) FIGURE 21. SUPPLY CURRENT vs SUPPLY VOLTAGE 7 42 EL1507CL EL1507CS HD3 HD2 HD2 -80 HD3 -85 IS+ (1/2 POWER) 0 34 -70 -75 6 0 VS=±12V AV=10 RL=100Ω RF=1.5kΩ f=1MHz -55 IS+ (3/4 POWER) 4 26 FIGURE 20. DIFFERENTIAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (FULL POWER MODE) IS+ (FULL POWER) IS- (FULL POWER) 18 VOP-P (V) FIGURE 19. DIFFERENTIAL BANDWIDTH vs SUPPLY VOLTAGE 18 EL1507CL EL1507CS VS=±12V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -55 EL1507CL EL1507CS 5 100M FIGURE 18. FREQUENCY RESPONSE vs CLOAD (EL1507CL - 1/2 POWER MODE) HD (dB) BANDWIDTH (MHz) 55 10M FREQUENCY (Hz) FIGURE 17. FREQUENCY RESPONSE vs CLOAD (EL1507CS - 1/2 POWER MODE) 30 22pF 10pF -90 2 10 18 26 34 42 VOP-P (V) FIGURE 22. DIFFERENTIAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (3/4 POWER MODE) FN7013.3 March 26, 2007 EL1507 Typical Performance Curves -50 RF=1.5kΩ AV=5 -50 RL=100Ω f=150kHz ALL POWER -60 LEVELS CS & CL -70 VS=±12V AV=10 RL=100Ω RF=1.5kΩ f=1MHz -55 -60 HD (dB) THD (dB) -40 VS=±12V VS=±6V -65 EL1507CL EL1507CS HD3 HD2 -70 HD2 -75 -80 -80 HD3 -85 -90 2 10 18 26 34 -90 42 2 10 18 VOP-P (V) FIGURE 23. DIFFERENTIAL TOTAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE -55 THD (dB) -45 VS=±12V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -60 -55 -60 1/2 POWER -70 FULL POWER HD3 -70 HD3 HD2 -80 HD2 -85 2 10 18 34 26 -90 42 2 4 6 8 VOP-P (V) -50 -45 -55 -60 1/2 POWER -65 3/4 POWER -70 14 16 18 20 EL1507CL EL1507CS VS=±6V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -50 HD (dB) THD (dB) -60 12 FIGURE 26. DIFFERENTIAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (3/4 POWER MODE) VS=±12V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -55 10 VOP-P (V) FIGURE 25. DIFFERENTIAL TOTAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (EL1507CS) HD3 -65 -70 HD3 HD2 -75 -80 -75 -80 42 EL1507CL EL1507CS -65 -75 -75 -80 VS=±6V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -50 3/4 POWER -65 34 FIGURE 24. DIFFERENTIAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (1/2 POWER MODE) HD (dB) -50 26 VOP-P (V) 2 12 22 32 42 VOP-P (V) FIGURE 27. DIFFERENTIAL TOTAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (EL1507CL) 8 HD2 -85 FULL POWER -90 2 4 6 8 10 12 14 16 18 20 VOP-P (V) FIGURE 28. DIFFERENTIAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (1/2 POWER MODE) FN7013.3 March 26, 2007 EL1507 Typical Performance Curves -50 -55 HD (dB) -60 -45 EL1507CL EL1507CS VS=±6V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -55 -65 HD3 -70 HD2 -75 2 6 4 8 10 3/4 POWER -65 1/2 POWER FULL POWER -75 HD2 -85 -60 -70 HD3 -80 -90 VS=±6V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -50 THD (dB) -45 12 14 16 18 -80 20 2 4 6 8 VOP-P (V) FIGURE 29. DIFFERENTIAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (FULL POWER MODE) -45 OUTPUT IMPEDANCE (Ω) THD (dB) -55 -60 -65 1/2 POWER 3/4 POWER -70 -75 -80 14 16 18 20 10 VS=±12V AV=1 RF=1.5kΩ 1 0.1 0.01 FULL POWER 2 4 6 8 10 12 14 16 18 0.001 10K 20 100K VOP-P (V) -30 0 PSRR (dB) 20 -50 B→A A→B -20 -40 PSRR- PSRR+ -60 -90 -110 10K 100M FIGURE 32. OUTPUT IMPEDANCE vs FREQUENCY (ALL POWER LEVELS) -10 -70 10M 1M FREQUENCY (Hz) FIGURE 31. DIFFERENTIAL TOTAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (EL1507CL) CHANNEL SEPARATION (dB) 12 FIGURE 30. DIFFERENTIAL TOTAL HARMONIC DISTORTION vs DIFFERENTIAL OUTPUT AMPLITUDE (EL1507CS) 100 VS=±6V AV=5 RL=100Ω RF=1.5kΩ f=1MHz -50 10 VOP-P (V) 100K 1M 10M 100M FREQUENCY (Hz) FIGURE 33. CHANNEL SEPARATION vs FREQUENCY (ALL POWER LEVELS) 9 -80 10K 100K 1M 10M 100M FREQUENCY (Hz) FIGURE 34. PSRR vs FREQUENCY FN7013.3 March 26, 2007 EL1507 Typical Performance Curves 100 40 0 -40 PHASE -80 100k -120 -160 10K GAIN -200 PHASE (°) MAGNITUDE (Ω) 1M -240 1K -280 100 1K 10K 100K IB10 EN IB+ 1 10 -320 100M 10M 1M VOLTAGE NOISE (nV/√Hz), CURRENT NOISE (pA/√Hz) 10M 100 FIGURE 35. TRANSIMPEDANCE (ROL) vs FREQUENCY 0.14 VS=±12V 0.35 1/2 POWER 0.3 0.25 3/4 POWER 0.2 0.15 0.1 FULL POWER 0.05 0 0 1 2 3 100K 1M 10M FIGURE 36. VOLTAGE AND CURRENT NOISE vs FREQUENCY DIFFERENTIAL PHASE (°) DIFFERENTIAL GAIN (%) 0.4 10K 1K FREQUENCY (Hz) FREQUENCY (Hz) 4 5 VS=±6V 0.12 1/2 POWER 0.1 3/4 POWER 0.08 0.06 FULL POWER 0.04 0.02 0 0 1 2 3 4 5 NUMBER OF 150Ω LOADS NUMBER OF 150Ω LOADS FIGURE 37. DIFFERENTIAL GAIN FIGURE 38. DIFFERENTIAL PHASE 0.12 DIFFERENTIAL PHASE (°) VS=±12V 0.1 1/2 POWER 0.08 CH 2 FULL POWER 0.06 CH 1 3/4 POWER 0.04 VOUT C0 , C1 Δ=48ns M=40ns CH 1=2V CH 2=2V 0.02 0 0 1 2 3 4 NUMBER OF 150Ω LOADS FIGURE 39. DIFFERENTIAL PHASE 10 5 40ns/DIV FIGURE 40. ENABLE RESPONSE FN7013.3 March 26, 2007 EL1507 Typical Performance Curves DIFFERENTIAL GAIN (%) 0.45 VS=±6V 0.4 0.35 CH 2 1/2 POWER VOUT 0.3 0.25 3/4 POWER 0.2 0.15 0.1 FULL POWER 0.05 0 CH 1 0 1 2 3 4 C0 , C1 M=400ns CH 1=2V CH 2=2V 5 NUMBER OF 150Ω LOADS 400ns/DIV FIGURE 41. DIFFERENTIAL GAIN FIGURE 42. DISABLE RESPONSE 490 14 FULL POWER 12 470 SLEW RATE (V/µS) SUPPLY CURRENT (mA) 16 3/4 POWER 10 8 1/2 POWER 6 4 DISABLED 2 0 -50 -25 0 25 50 450 430 410 390 370 75 100 125 350 -50 150 -25 0 FIGURE 43. POSITIVE SUPPLY CURRENT vs TEMPERATURE 75 100 125 150 FIGURE 44. SLEW RATE vs TEMPERATURE 18 11.8 16 OUTPUT VOLTAGE (±V) INPUT BIAS CURRENT (µA) 50 TEMPERATURE (°C) TEMPERATURE (°C) 14 12 10 IB- 8 6 4 2 IB+ -25 0 25 50 75 100 125 150 TEMPERATURE (°C) FIGURE 45. INPUT BIAS CURRENT vs TEMPERATURE 11 10.8 9.8 8.8 7.8 6.8 5.8 0 -2 -50 25 RL=100Ω 4.8 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) FIGURE 46. OUTPUT VOLTAGE vs TEMPERATURE FN7013.3 March 26, 2007 EL1507 10 3.5 8 3 TRANSIMPEDANCE (MΩ) OFFSET VOLTAGE (mV) Typical Performance Curves 6 4 2 0 -2 -50 -25 0 25 50 75 100 125 2.5 2 1.5 1 0.5 0 150 -50 -25 0 TEMPERATURE (°C) FIGURE 47. OFFSET VOLTAGE vs TEMPERATURE JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 4.5 1.136W 1 SO16 θJA=110°C/W 0.8 833mW 0.6 QFN16 θJA=150°C/W 0.4 50 75 100 125 150 FIGURE 48. TRANSIMPEDANCE vs TEMPERATURE POWER DISSIPATION (W) POWER DISSIPATION (W) 1.2 25 TEMPERATURE (°C) 0.2 JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD - QFN EXPOSED DIEPAD SOLDERED TO PCB PER JESD51-5 4 3.5 3.125W QFN16 3 θJA=40°C/W 2.5 2 1.563W 1.5 SO16 1 θJA=80°C/W 0.5 0 0 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (°C) FIGURE 49. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE 12 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (°C) FIGURE 50. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FN7013.3 March 26, 2007 EL1507 Input Connections Applications Information The EL1507 consists of two high-power line driver amplifiers that can be connected for full duplex differential line transmission. The amplifiers are designed to be used with signals up to 4MHz and produce low distortion levels. A typical interface circuit is shown in Figure 51 below. DRIVER INPUT + - ROUT LINE + Power Supplies & Dissipation RF RG ZLINE RF LINE RF RECEIVE OUT - R RIN + RECEIVE AMPLIFIERS Due to the high power drive capability of the EL1507, much attention needs to be paid to power dissipation. The power that needs to be dissipated in the EL1507 has two main contributors. The first is the quiescent current dissipation. The second is the dissipation of the output stage. ROUT + RECEIVE OUT + The EL1507 amplifiers are somewhat sensitive to source impedance. In particular, they do not like being driven by inductive sources. More than 100nH of source impedance can cause ringing or even oscillations. This inductance is equivalent to about 4” of unshielded wiring, or 6” of unterminated transmission line. Normal high-frequency construction obviates any such problem. + RF R RIN The quiescent power in the EL1507 is not constant with varying outputs. In reality, 7mA of the 15mA needed to power the drivers is converted in to output current. Therefore, in the equation below we should subtract the average output current, IO, or 7mA, whichever is the lowest. We’ll call this term IX. Therefore, we can determine a quiescent current with the equation: P Dquiescent = V S × ( I S – 2I X ) FIGURE 51. TYPICAL LINE INTERFACE CONNECTION The amplifiers are wired with one in positive gain and the other in a negative gain configuration to generate a differential output for a single-ended input. They will exhibit very similar frequency responses for gains of three or greater and thus generate very small common-mode outputs over frequency, but for low gains the two drivers RF's need to be adjusted to give similar frequency responses. The positive-gain driver will generally exhibit more bandwidth and peaking than the negative-gain driver. If a differential signal is available to the drive amplifiers, they may be wired so: + - 2RG RF where: VS is the supply voltage (VS+ to VS-) IS is the maximum quiescent supply current (IS+ + IS-) IX is the lesser of IO or 7mA (generally IX = 7mA) The dissipation in the output stage has two main contributors. Firstly, we have the average voltage drop across the output transistor and secondly, the average output current. For minimal power dissipation, the user should select the supply voltage and the line transformer ratio accordingly. The supply voltage should be kept as low as possible, while the transformer ratio should be selected so that the peak voltage required from the EL1507 is close to the maximum available output swing. There is a trade off, however, with the selection of transformer ratio. As the ratio is increased, the receive signal available to the receivers is reduced. RF Once the user has selected the transformer ratio, the dissipation in the output stages can be selected with the following equation: + VS P Dtransistors = 2 × I O × ⎛ ------- – V O ⎞ ⎝ 2 ⎠ FIGURE 52. DRIVERS WIRED FOR DIFFERENTIAL INPUT Each amplifier has identical positive gain connections, and optimum common-mode rejection occurs. Further, DC input errors are duplicated and create common-mode rather than differential line errors. where: VS is the supply voltage (VS+ to VS-) VO is the average output voltage per channel IO is the average output current per channel 13 FN7013.3 March 26, 2007 EL1507 The overall power dissipation (PDISS) is obtained by adding PDquiescent and PDtransistor. is true of badly terminated lines connected without a series matching resistor. Then, the θJA requirement needs to be calculated. This is done using the equation: Power Supplies ( T JUNCT – T AMB ) θ JA = ------------------------------------------------P DISS where: TJUNCT is the maximum die temperature (150°C) TAMB is the maximum ambient temperature PDISS is the dissipation calculated above θJA is the junction to ambient thermal resistance for the package when mounted on the PCB This θJA value is then used to calculate the area of copper needed on the board to dissipate the power. The SO power packages are designed so that heat may be conducted away from the device in an efficient manner. To disperse this heat, the center leads are internally connected to the mounting platform of the die. Heat flows through the leads into the circuit board copper, then spreads and convects to air. Thus, the ground plane on the component side of the board becomes the heatsink. This has proven to be a very effective technique. A separate application note details the 16 Ld QFN PCB design considerations. The power supplies should be well bypassed close to the EL1507. A 3.3µF tantalum capacitor for each supply works well. Since the load currents are differential, they should not travel through the board copper and set up ground loops that can return to amplifier inputs. Due to the class AB output stage design, these currents have heavy harmonic content. If the ground terminal of the positive and negative bypass capacitors are connected to each other directly and then returned to circuit ground, no such ground loops will occur. This scheme is employed in the layout of the EL1507 demonstration board, and documentation can be obtained from the factory. Feedback Resistor Value The bandwidth and peaking of the amplifiers varies with supply voltage somewhat and with gain settings. The feedback resistor values can be adjusted to produce an optimal frequency response. Here is a series of resistor values that produce an optimal driver frequency response (