LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp; Single, Single with Shutdown and Quad Check for Samples: LMH6714, LMH6720, LMH6722, LMH6722-Q1 FEATURES 1 • 2 • • • • • • • • • • • • • • • 400MHz (AV = +2V/V, VOUT = 500mVPP) −3dB BW 250MHz (AV = +2V/V, VOUT = 2VPP) -3dB BW 0.1dB Gain Flatness to 120MHz Low Power: 5.6mA TTL Compatible Shutdown Pin (LMH6720) Very Low Diff. Gain, Phase: 0.01%, 0.01° (LMH6714) −58 HD2/ −70 HD3 at 20MHz Fast Slew Rate: 1800V/μs Low Shutdown Current: 500uA (LMH6720) 11ns Turn on Time (LMH6720) 7ns Shutdown Time (LMH6720) Unity Gain Stable Improved Replacement for CLC400,401,402,404,406 and 446 (LMH6714) Improved Replacement for CLC405 (LMH6720) Improved Replacement for CLC415 (LMH6722) LMH6722QSD is AEC-Q100 Grade 1 Qualified and is Manufactured on an Automotive Grade Flow DESCRIPTION The LMH6714/LMH6720/LMH6722 series combine Texas Instruments' VIP10 high speed complementary bipolar process with Texas Instruments' current feedback topology to produce a very high speed op amp. These amplifiers provide a 400MHz small signal bandwidth at a gain of +2V/V and a 1800V/μs slew rate while consuming only 5.6mA from ±5V supplies. The LMH6714/LMH6720/LMH6722 series offer exceptional video performance with its 0.01% and 0.01° differential gain and phase errors for NTSC and PAL video signals while driving a back terminated 75Ω load. They also offer a flat gain response of 0.1dB to 120MHz. Additionally, they can deliver 70mA continuous output current. This level of performance makes them an ideal op amp for broadcast quality video systems. The LMH6714/LMH6720/LMH6722's small packages (SOIC, SOT-23 and WSON), low power requirement, low noise and distortion allow the LMH6714/LMH6720/LMH6722 to serve portable RF applications. The high impedance state during shutdown makes the LMH6720 suitable for use in multiplexing multiple high speed signals onto a shared transmission line. The LMH6720 is also ideal for portable applications where current draw can be reduced with the shutdown function. APPLICATIONS • • • • • • • HDTV, NTSC & PAL Video Systems Video Switching and Distribution Wideband Active Filters Cable Drivers High Speed Multiplexer (LMH6720) Programmable Gain Amplifier (LMH6720) Automotive (LMH6722Q) 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2002–2013, Texas Instruments Incorporated LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com Typical Performance Non-Inverting Small Signal Frequency Response Differential Gain and Phase vs. Number of Video Loads (LMH6714) 2 0.05 0.04 0.04 PHASE -3 0 -4 -45 AV = 2, RF = 300: -90 -5 -6 AV = 6, RF = 200: -135 -7 -180 VO = 500mVPP -8 1 100 10 FREQUENCY (MHz) -225 1000 PHASE 0.03 0.03 0.02 0.02 GAIN 0.01 0.01 0 DIFFERENTIAL PHASE (°) -2 PHASE (°) -1 DIFFERENTIAL GAIN (%) GAIN 0 GAIN (dB) 0.05 AV = 1, RF = 600: 1 0 1 2 3 4 VIDEO LOADS (150: EACH) Figure 1. Figure 2. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) ESD Tolerance (3) Human Body Model 2000V Machine Model 200V VCC ±6.75V IOUT See (4) Common Mode Input Voltage ±VCC Differential Input Voltage 2.2V Maximum Junction Temperature +150°C −65°C to +150°C Storage Temperature Range Lead Temperature (soldering 10 sec) +300°C Storage Temperature Range −65°C to +150°C Shutdown Pin Voltage (5) +VCC to VCC/2-1V (1) (2) (3) (4) (5) 2 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not ensured. For specific specifications, see the Electrical Characteristics tables. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications. Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC). Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC). The maximum output current (IOUT) is determined by device power dissipation limitations. See the POWER DISSIPATION section for more details. The shutdown pin is designed to work between 0 and VCC with split supplies (VCC = -VEE). With single supplies (VEE = ground) the shutdown pin should not be taken below VCC/2. Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 Operating Ratings (1) Thermal Resistance Package (θJA) 5-Pin SOT-23 (DBV) 232°C/W 6-Pin SOT-23 (DBV) 198°C/W 8-Pin SOIC (D) 145°C/W 14-Pin SOIC (D) 130°C/W 14-Pin TSSOP (PW) 160°C/W 14-Pin WSON (NHK) 46°C/W Operating Temperature −40°C to 125°C LMH6722Q −40°C to 85°C All others Supply Voltage Range (1) 8V (±4V) to 12.5V (±6.25V) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not ensured. For specific specifications, see the Electrical Characteristics tables. Electrical Characteristics Unless specified, AV = +2, RF = 300Ω: VCC = ±5V, RL = 100Ω, LMH6714/LMH6720/LMH6722. Boldface limits apply at temperature extremes. Symbol Parameter Conditions Min (1) Typ (2) Max (1) Units Frequency Domain Response SSBW −3dB Bandwidth VOUT = 0.5VPP 345 400 MHz LSBW −3dB Bandwidth VOUT = 2.0VPP 200 250 MHz LSBW −3dB Bandwidth, LMH6722 TSSOP package only VOUT = 2.0VPP 170 250 MHz Gain Flatness VOUT = 2VPP dB GFP GFR Peaking DC to 120MHz 0.1 Rolloff DC to 120MHz 0.1 dB LPD Linear Phase Deviation DC to 120MHz 0.5 deg DG Differential Gain RL = 150Ω, 4.43MHz (LMH6714) 0.01 % DG Differential Gain RL = 150Ω, 4.43MHz (LMH6720) 0.02 % DP Differential Phase RL = 150Ω, 4.43MHz 0.01 deg .5V Step 1.5 ns 2V Step 2.6 ns 12 ns 1800 V/µs Time Domain Response TRS Rise and Fall Time TRL ts Settling Time to 0.05% 2V Step SR Slew Rate 6V Step 1200 Distortion and Noise Response HD2 2nd Harmonic Distortion 2VPP, 20MHz −58 dBc HD3 3rd Harmonic Distortion 2VPP, 20MHz −70 dBc IMD 3rd Order Intermodulation Products 10MHz, POUT = 0dBm −78 dBc 3.4 nV/√Hz Equivalent Input Noise VN Non-Inverting Voltage >1MHz NICN Inverting Current >1MHz 10 pA/√Hz ICN Non-Inverting Current >1MHz 1.2 pA/√Hz (1) (2) All limits are specified by testing, design, or statistical analysis. Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped production material. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 3 LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (continued) Unless specified, AV = +2, RF = 300Ω: VCC = ±5V, RL = 100Ω, LMH6714/LMH6720/LMH6722. Boldface limits apply at temperature extremes. Symbol Parameter Conditions Min (1) Typ (2) Max (1) Units ±0.2 ±6 ±8 mV Static, DC Performance VIO Input Offset Voltage DVIO IBN Average Drift DIBN IBI Non-Inverting ±1 Inverting −4 Average Drift ±10 ±15 4 Input Bias Current DIBI μV/°C 8 Input Bias Current nA/°C ±12 ±20 µA 41 nA/°C PSRR Power Supply Rejection Ratio DC 48 47 58 dB CMRR Common Mode Rejection Ratio DC 48 45 54 dB ICC Supply Current RL = ∞ LMH6714 LMH6720 4.5 3 5.6 7.5 8 LMH6722 18 15 22.5 30 32 500 670 ICCI Average Drift µA Supply Current During Shutdown LMH6720 mA μA Miscellaneous Performance RIN Input Resistance Non-Inverting 2 MΩ CIN Input Capacitance Non-Inverting 1.0 pF ROUT Output Resistance Closed Loop 0.06 Ω VOUT Output Voltage Range RL = ∞ ±3.5 ±3.4 ±3.9 RL = 100Ω ±3.6 ±3.4 ±3.8 CMIR Input Voltage Range Common Mode IOUT Output Current (3) VIN = 0V, Max Linear Current 50 V ±2.2 V 70 mA OFFMAX Voltage for Shutdown LMH6720 ONMIN Voltage for Turn On LMH6720 2.0 IIH Current Turn On LMH6720, SD = 2.0V −20 −30 2 20 30 IIL Current Shutdown LMH6720, SD = .8V −600 −400 −100 IOZ ROUT Shutdown LMH6720, SD = .8V 0.2 1.8 MΩ ton Turn on Time LMH6720 11 ns toff Turn off Time LMH6720 7 ns (3) 4 0.8 V V μA μA The maximum output current (IOUT) is determined by device power dissipation limitations. See the POWER DISSIPATION section for more details. Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 CONNECTION DIAGRAMS 1 5 OUT V + 6 1 OUTPUT 5 V - 2 V + +IN + -IN +IN Figure 3. 5-Pin SOT-23 (LMH6714) (Top View) See Package Number DBV N/C -IN +IN V - 1 2 3 4 + + SD - 4 3 -IN Figure 4. 6-Pin SOT-23 (LMH6720) (Top View) See Package Number DBV 8 - 2 4 3 - V 7 6 5 N/C + V OUTPUT N/C Figure 6. 8-Pin SOIC (LMH6714) (Top View) See Package Number D Copyright © 2002–2013, Texas Instruments Incorporated N/C -IN +IN V - Figure 5. 14-Pin SOIC, TSSOP and WSON (LMH6722) (Top View) See Package Numbers D, PW, and NHK 1 2 3 8 7 - 6 + 4 5 SD + V OUTPUT N/C Figure 7. 8-Pin SOIC (LMH6720) (Top View) See Package Number D Submit Documentation Feedback Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 5 LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (V = +5V, V− = −5V, AV = 2, RF = 300Ω, RL = 100Ω Unless Specified). + Non-Inverting Small Signal Frequency Response Non-Inverting Large Signal Frequency Response 2 2 AV = 1, RF = 600: 1 GAIN RF = 300: GAIN -1 PHASE -3 0 -4 -45 AV = 2, RF = 300: GAIN (dB) PHASE (°) -1 -2 -3 -45 -5 -90 -5 -135 -6 -7 -180 -7 -225 1000 -8 VO = 500mVPP 100 10 FREQUENCY (MHz) 1 0 PHASE -4 -6 AV = 6, RF = 200: -8 AV = 1, RF = 600: -2 -90 AV = 6, RF = 200: -180 100 10 FREQUENCY (MHz) 1 Inverting Frequency Response Non-Inverting Frequency Response vs. VO 2 VO = 2VPP 1 AV = -1 RF = 300: 1 0 0 -3 GAIN (dB) -2 PHASE (°) AV = -2 -2 PHASE -3 -4 -45 -5 -90 -5 -45 -135 -6 -7 -180 -7 -8 -225 1000 -8 -6 AV = -6 1 10 100 FREQUENCY (MHz) 0 -4 VO = 2VPP RF = 300: -135 VO = 4VPP Inverting Frequency Response vs. VO Harmonic Distortion vs. Frequency 0 0 -225 1000 Figure 11. 2 VO = 2VPP -10 VO = 2VPP GAIN -180 100 10 FREQUENCY (MHz) Figure 10. 1 -90 AV = 2V/V 1 PHASE (°) VO = 1VPP -1 -1 GAIN (dB) VO = .5VPP GAIN 0 -2 PHASE 0 -4 -45 -5 -90 -6 AV = -1V/V -7 VO = .5VPP RF = 300: -8 10 100 FREQUENCY (MHz) Figure 12. Submit Documentation Feedback DISTORTION (dBc) VO = 4VPP PHASE (°) -20 -1 GAIN (dB) -225 1000 Figure 9. 2 6 -135 VO = 2VPP Figure 8. -3 PHASE (°) 0 0 GAIN (dB) AV = 2, 1 -30 -40 -50 -60 -70 -135 -80 -180 -90 100 -225 0 -100 HD2 HD3 1 10 FREQUENCY (MHz) 100 Figure 13. Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 Typical Performance Characteristics (continued) − + (V = +5V, V = −5V, AV = 2, RF = 300Ω, RL = 100Ω Unless Specified). 2nd Harmonic Distortion vs. VOUT 3rd Harmonic Distortion vs. VOUT 0 -10 -10 -20 -20 -30 DISTORTION (dBc) DISTORTION (dBc) 0 50MHz -40 -50 10MHz -60 -70 -30 -40 50MHz -50 -60 -70 -80 10MHz -80 5MHz -90 -90 5MHz -100 -100 0.5 1 1.5 2 2.5 VOUT (VPP) 3 3.5 4 0 0.5 1 3 3.5 4 0.04 0.04 PHASE 0.03 0.03 0.02 0.02 GAIN 0.01 0.01 0 DIFFERENTIAL GAIN (%) DG/DP (LMH6720) 0.05 DIFFERENTIAL PHASE (°) DG/DP (LMH6714) DIFFERENTIAL GAIN (%) 2.5 Figure 15. 0.05 0.08 0.08 0.07 0.07 0.06 0.06 0.05 0.05 3 0.04 0.04 GAIN PHASE 0.03 0.03 0.02 0.02 0.01 0.01 0 0 0 2 2 VOUT (VPP) Figure 14. 1 1.5 2 1 4 DIFFERENTIAL PHASE (°) 0 3 4 NUMBER OF VIDEO LOADS VIDEO LOADS (150: EACH) Figure 16. Figure 17. DG/DP (LMH6722) Large Signal Pulse Response 0.04 4 0.04 AV = 2V/V 0.03 PHASE 0.02 0.02 GAIN 0.01 0.01 2 1 VOUT (V) 0.03 DIFFERENTIAL PHASE (°) DIFFERENTIAL GAIN (%) 3 0 -1 -2 -3 0 0 1 2 3 VIDEO LOADS (150: EACH) Figure 18. Copyright © 2002–2013, Texas Instruments Incorporated 4 -4 0 5 10 15 20 25 30 35 40 45 50 TIME (nS) Figure 19. Submit Documentation Feedback Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 7 LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) − + (V = +5V, V = −5V, AV = 2, RF = 300Ω, RL = 100Ω Unless Specified). Small Signal Pulse Response Closed Loop Output Resistance 1000 1.5 1 100 AV = +2V/V RF = 300: ROUT (:) VOUT (V) 0.5 0 10 1 AV = -1V/V -0.5 RF = 300: 0.1 -1 0.01 0.01 -1.5 0 5 10 15 20 25 30 35 40 45 50 1 100 10 TIME (nS) FREQUENCY (MHz) Figure 20. Figure 21. Open Loop Transimpedance Z(s) 1000 PSRR vs. Frequency 130 0 120 -10 110 -20 MAGNITUDE 90 0 80 -45 -PSRR PSRR (dB) 100 PHASE (°) TRANSIMPEDANCE (dB:) 0.1 PHASE -30 -40 70 -90 -50 60 -135 -60 -180 1000 -70 +PSRR 50 0.01 0.1 1 10 100 0.1 1 FREQUENCY (MHz) 10 100 1000 FREQUENCY (MHz) Figure 22. Figure 23. CMRR vs. Frequency Frequency Response vs. RF 1 0 0 -10 RF = 147: -2 -20 GAIN (dB) CMRR (dB) -1 -30 RF = 300: -3 RF = 400: -4 RF = 600: -5 -40 -6 -50 AV = 2V/V -7 0.1 1 100 10 FREQUENCY (MHz) Figure 24. 8 VOUT = 0.5VPP -8 -60 Submit Documentation Feedback 1000 1 100 10 FREQUENCY (MHz) 1000 Figure 25. Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 Typical Performance Characteristics (continued) − + (V = +5V, V = −5V, AV = 2, RF = 300Ω, RL = 100Ω Unless Specified). DC Errors vs. Temperature Maximum VOUT vs. Frequency 0 IBN -1 -0.4 -3 VOS IBI -0.6 -4 -5 -0.8 -6 -1 -7 -1.2 7 MAXIMUM VOUT (VPP) -2 INPUT BIAS CURRENT (PA) -0.2 VOS (mV) 8 0 6 5 4 3 2 -8 -1.4 -40 -20 0 20 40 60 80 1 -9 100 0.1 1 100 1000 Figure 26. Figure 27. 3rd Order Intermodulation vs. Output Power Crosstalk vs. Frequency (LMH6722) for each channel with all others active -10 -20 0 TWO EQUAL POWER TONES CENTERED AT LISTED FREQUENCY -10 -20 -30 -40 -50 100MHz -60 20MHz -70 -30 CROSSTALK (dBc) SPURIOUS SIGNAL LEVEL (dBc) 10 FREQUENCY (MHz) TEMPERATURE (°C) D -40 -50 A -60 -70 -80 C -80 -90 -90 5MHz 10MHz -100 -15 -12 -9 -6 -3 0 3 6 9 B -100 0.1 12 15 1 100 100 1000 FREQUENCY (MHz) OUTPUT POWER FOR EACH TONE (dBmW) Figure 28. Figure 29. Noise vs. Frequency 1000 Hz) 100 100 INVERTING CURRENT 10 10 VOLTAGE NON-INVERTING CURRENT 1 1 1 10 100 CURRENT NOISE (pA/ VOLTAGE NOISE (nV/ Hz) 1000 1k 10k 100k 1M FREQUENCY (Hz) Figure 30. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 9 LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com APPLICATION SECTION FEEDBACK RESISTOR SELECTION One of the key benefits of a current feedback operational amplifier is the ability to maintain optimum frequency response independent of gain by using appropriate values for the feedback resistor (RF). The Electrical Characteristics and Typical Performance plots specify an RF of 300Ω, a gain of +2V/V and ±5V power supplies (unless otherwise specified). Generally, lowering RF from it's recommended value will peak the frequency response and extend the bandwidth while increasing the value of RF will cause the frequency response to roll off faster. Reducing the value of RF too far below it's recommended value will cause overshoot, ringing and, eventually, oscillation. 1 0 -1 RF = 147: GAIN (dB) -2 RF = 300: -3 RF = 400: -4 RF = 600: -5 -6 AV = 2V/V -7 VOUT = 0.5VPP -8 1 100 10 FREQUENCY (MHz) 1000 Figure 31. Frequency Response vs. RF Figure 31 shows the LMH6714/LMH6720/LMH6722's frequency response as RF is varied (RL = 100Ω, AV = +2). This plot shows that an RF of 147Ω results in peaking. An RF of 300Ω gives near maximal bandwidth and gain flatness with good stability. An RF of 400Ω gives excellent stability with only a small bandwidth penalty. Since all applications are slightly different it is worth some experimentation to find the optimal RF for a given circuit. Note that it is not possible to use a current feedback amplifier with the output shorted directly to the inverting input. The buffer configuration of the LMH6714/LMH6720/LMH6722 requires a 600Ω feedback resistor for stable operation. For more information see Application Note OA-13 (SNOA366) which describes the relationship between RF and closed-loop frequency response for current feedback operational amplifiers. The value for the inverting input impedance for the LMH6714/LMH6720/LMH6722 is approximately 180Ω. The LMH6714/LMH6720/LMH6722 is designed for optimum performance at gains of +1 to +6 V/V and −1 to −5V/V. When using gains of ±7V/V or more the low values of RG required will make inverting input impedances very low. When configuring the LMH6714/LMH6720/LMH6722 for gains other than +2V/V, it is usually necessary to adjust the value of the feedback resistor. Figure 32 and Figure 33 provide recommended feedback resistor values for a number of gain selections. 700 SUGGESTED RF (:) 600 500 400 300 200 100 0 1 2 3 4 5 6 7 8 9 10 GAIN (V/V) Figure 32. RF vs. Non-Inverting Gain 10 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 In the Figure 32 and Figure 33 charts, the recommended value of RF is depicted by the solid line, which starts high, decreases to 200Ω and begins increasing again. The reason that a higher RF is required at higher gains is the need to keep RG from decreasing too far below the output impedance of the input buffer. For the LMH6714/LMH6720/LMH6722 the output resistance of the input buffer is approximately 180Ω and 50Ω is a practical lower limit for RG. Due to the limitations on RG the LMH6714/LMH6720/LMH6722 begins to operate in a gain bandwidth limited fashion for gains of ±5V/V or greater. 450 400 SUGGESTED RF (:) 350 300 250 200 150 100 50 0 1 2 3 4 5 6 7 8 9 10 GAIN (-V/V) Figure 33. RF vs. Inverting Gain ACTIVE FILTERS When using any current feedback Operational Amplifier as an active filter it is important to be very careful when using reactive components in the feedback loop. Anything that reduces the impedance of the negative feedback, especially at higher frequencies, will almost certainly cause stability problems. Likewise capacitance on the inverting input needs to be avoided. See Application Notes OA-07 (SNOA365) and OA-26 (SNOA387) for more information on Active Filter applications for Current Feedback Op Amps. Figure 34. Enable/Disable Operation ENABLE/DISABLE OPERATION USING ±5V SUPPLIES (LMH6720 ONLY) The LMH6720 has a TTL logic compatible disable function. Apply a logic low (<.8V) to the DS pin and the LMH6720 is disabled. Apply a logic high (>2.0V), or let the pin float and the LMH6720 is enabled. Voltage, not current, at the Disable pin determines the enable/disable state. Care must be exercised to prevent the disable pin voltage from going more than .8V below the midpoint of the supply voltages (0V with split supplies, VCC/2 with single supplies) doing so could cause transistor Q1 to Zener resulting in damage to the disable circuit. The core amplifier is unaffected by this, but disable operation could become slower as a result. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 11 LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com Disabled, the LMH6720 inputs and output become high impedances. While disabled the LMH6720 quiescent current is approximately 500μA. Because of the pull up resistor on the disable circuit the ICC and IEE currents are not balanced in the disabled state. The positive supply current (ICC) is approximately 500μA while the negative supply current (IEE) is only 200μA. The remaining IEE current of 300μA flows through the disable pin. The disable function can be used to create analog switches or multiplexers. Implement a single analog switch with one LMH6720 positioned between an input and output. Create an analog multiplexer with several LMH6720's. The LMH6720 is at it's best at a gain of 1 for multiplexer applications because there is no RG to shunt signals to ground. DISABLE LIMITATIONS (LMH6720 ONLY) The feedback Resistor (RF) limits off isolation in inverting gain configurations. During shutdown the impedance of the LMH6720 inputs and output become very high (>1MΩ), however RF and RG are the dominant factor for effective output impedance. Do not apply voltages greater than +VCC or less than 0V (VCC/2 single supply) to the disable pin. The input ESD diodes will also conduct if the signal leakage through the feedback resistors brings the inverting input near either supply rail. +5V C4 C2 .01PF 6.8PF IN + OUT 50: RIN 50: ROUT .1PF - C1 300: RF C3 .01PF 300: 6.8PF RG C5 -5V Figure 35. Typical Application with Suggested Supply Bypassing LAYOUT CONSIDERATIONS Whenever questions about layout arise, use the evaluation board as a guide. The following Evaluation boards are available with sample parts: LMH6714 LMH6720 LMH6722 SOT-23 LMH730216 SOIC LMH730227 SOT-23 LMH730216 SOIC LMH730227 SOIC LMH730231 TSSOP LMH730131 To reduce parasitic capacitances, the ground plane should be removed near the input and output pins. To reduce series inductance, trace lengths of components in the feedback loop should be minimized. For long signal paths controlled impedance lines should be used, along with impedance matching at both ends. Bypass capacitors should be placed as close to the device as possible. Bypass capacitors from each rail to ground are applied in pairs. The larger electrolytic bypass capacitors can be located anywhere on the board, the smaller ceramic capacitors should be placed as close to the device as possible. In addition Figure 35 shows a capacitor (C1) across the supplies with no connection to ground. This capacitor is optional, however it is required for best 2nd Harmonic suppression. If this capacitor is omitted C2 and C3 should be increased to .1μF each. 12 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 VIDEO PERFORMANCE The LMH6714/LMH6720/LMH6722 has been designed to provide excellent performance with both PAL and NTSC composite video signals. Performance degrades as the loading is increased, therefore best performance will be obtained with back terminated loads. The back termination reduces reflections from the transmission line and effectively masks capacitance from the amplifier output stage. While all parts offer excellent video performance the LMH6714 and LMH6722 are slightly better than the LMH6720. WIDE BAND DIGITAL PROGRAMMABLE GAIN AMPLIFIER (LMH6720 ONLY) Figure 36. Wideband Digitally Controlled Programmable Gain Amplifier Channel Switching Figure 37. PGA Output As shown in Figure 36 and Figure 37 the LMH6720 can be used to construct a digitally controlled programmable gain amplifier. Each amplifier is configured to provide a digitally selectable gain. To provide for accurate gain settings, 1% or better tolerance is recommended on the feedback and gain resistors. The gain provided by each digital code is arbitrary through selection of the feedback and gain resistor values. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 13 LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com AMPLITUDE EQUALIZATION Sending signals over coaxial cable greater than 50 meters in length will attenuate high frequency signal components much more than lower frequency components. An equalizer can be made to pre emphasize the higher frequency components so that the final signal has less distortion. This process can be done at either end of the cable. The circuit in Figure 38 shows a receiver with some additional components in the feedback loop to equalize the incoming signal. The RC networks peak the signal at higher frequencies. This peaking is a piecewise linear approximation of the inverse of the frequency response of the coaxial cable. Figure 39 shows the effect of this equalization on a digital signal that has passed through 150 meters of coaxial cable. Figure 40 shows a Bode plot of the frequency response of the circuit in Figure 38 along with equations needed to design the pole and zero frequencies. Figure 41 shows a network analyzer plot of an LMH6714/LMH6720/LMH6722 with the following component values: RG = 309Ω R1 = 450Ω C1 = 470pF R2 = 91Ω C2 = 68pF Figure 38. Equalizer Circuit Schematic Figure 39. Digital Signal without and with Equalization 14 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 LMH6714, LMH6720 LMH6722, LMH6722-Q1 www.ti.com SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 Figure 40. Design Equations 10 8 GAIN (dB) 6 4 2 0 -2 -4 -6 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 41. Equalizer Frequency Response POWER DISSIPATION Follow these steps to determine the Maximum power dissipation for the LMH6714/LMH6720/LMH6722: 1. Calculate the quiescent (no load) power: PAMP = ICC (VCC -VEE) 2. Calculate the RMS power at the output stage: POUT (RMS) = ((VCC - VOUT (RMS)) * IOUT (RMS)), where VOUT and IOUT are the voltage and current across the external load. 3. Calculate the total RMS power: PT = PAMP + POUT The maximum power that the LMH6714/LMH6720/LMH6722, package can dissipate at a given temperature can be derived with the following equation: PMAX = (150° - TA)/ θJA, where TA = Ambient temperature (°C) and θJA = Thermal resistance, from junction to ambient, for a given package (°C/W). For the SOIC package θJA is 145°C/W, for the 5-pin SOT-23 it is 232°C/W. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 15 LMH6714, LMH6720 LMH6722, LMH6722-Q1 SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision F (April 2013) to Revision G • 16 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 15 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1 PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LMH6714MA NRND SOIC D 8 95 TBD Call TI Call TI -40 to 85 LMH67 14MA LMH6714MA/NOPB ACTIVE SOIC D 8 95 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 LMH67 14MA LMH6714MAX/NOPB ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 LMH67 14MA LMH6714MF NRND SOT-23 DBV 5 1000 TBD Call TI Call TI -40 to 85 A95A LMH6714MF/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 A95A LMH6714MFX/NOPB ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 A95A LMH6720MA NRND SOIC D 8 95 TBD Call TI Call TI -40 to 85 LMH67 20MA LMH6720MA/NOPB ACTIVE SOIC D 8 95 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 LMH67 20MA LMH6720MAX NRND SOIC D 8 2500 TBD Call TI Call TI -40 to 85 LMH67 20MA LMH6720MAX/NOPB ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 LMH67 20MA LMH6720MF/NOPB ACTIVE SOT-23 DBV 6 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 A96A LMH6720MFX/NOPB ACTIVE SOT-23 DBV 6 3000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 A96A LMH6722MA NRND SOIC D 14 55 TBD Call TI Call TI -40 to 85 LMH67 22MA LMH6722MA/NOPB ACTIVE SOIC D 14 55 Green (RoHS & no Sb/Br) SN | CU SN Level-1-260C-UNLIM -40 to 85 LMH67 22MA LMH6722MAX NRND SOIC D 14 2500 TBD Call TI Call TI -40 to 85 LMH67 22MA LMH6722MAX/NOPB ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) SN | CU SN Level-1-260C-UNLIM -40 to 85 LMH67 22MA LMH6722MT/NOPB ACTIVE TSSOP PW 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 LMH67 22MT Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LMH6722MTX/NOPB ACTIVE TSSOP PW 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 LMH67 22MT LMH6722QSD/NOPB ACTIVE WSON NHK 14 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L6722Q LMH6722QSDX/NOPB ACTIVE WSON NHK 14 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L6722Q LMH6722SD/NOPB ACTIVE WSON NHK 14 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L6722 LMH6722SDX/NOPB ACTIVE WSON NHK 14 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L6722 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Addendum-Page 2 Samples PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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OTHER QUALIFIED VERSIONS OF LMH6722, LMH6722-Q1 : • Catalog: LMH6722 • Automotive: LMH6722-Q1 NOTE: Qualified Version Definitions: • Catalog - TI's standard catalog product • Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects Addendum-Page 3 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMH6714MAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMH6714MF SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LMH6714MF/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LMH6714MFX/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LMH6720MAX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMH6720MAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMH6720MF/NOPB SOT-23 DBV 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LMH6720MFX/NOPB SOT-23 DBV 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LMH6722MAX SOIC D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.0 Q1 LMH6722MAX/NOPB SOIC D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.0 Q1 LMH6722MTX/NOPB TSSOP PW 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LMH6722QSD/NOPB WSON NHK 14 1000 178.0 12.4 3.3 4.3 1.0 8.0 12.0 Q1 LMH6722QSDX/NOPB WSON NHK 14 4500 330.0 12.4 3.3 4.3 1.0 8.0 12.0 Q1 LMH6722SD/NOPB WSON NHK 14 1000 178.0 12.4 3.3 4.3 1.0 8.0 12.0 Q1 LMH6722SDX/NOPB WSON NHK 14 4500 330.0 12.4 3.3 4.3 1.0 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH6714MAX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LMH6714MF SOT-23 DBV 5 1000 210.0 185.0 35.0 LMH6714MF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMH6714MFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMH6720MAX SOIC D 8 2500 367.0 367.0 35.0 LMH6720MAX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LMH6720MF/NOPB SOT-23 DBV 6 1000 210.0 185.0 35.0 LMH6720MFX/NOPB SOT-23 DBV 6 3000 210.0 185.0 35.0 LMH6722MAX SOIC D 14 2500 367.0 367.0 35.0 LMH6722MAX/NOPB SOIC D 14 2500 367.0 367.0 35.0 LMH6722MTX/NOPB TSSOP PW 14 2500 367.0 367.0 35.0 LMH6722QSD/NOPB WSON NHK 14 1000 210.0 185.0 35.0 LMH6722QSDX/NOPB WSON NHK 14 4500 367.0 367.0 35.0 LMH6722SD/NOPB WSON NHK 14 1000 210.0 185.0 35.0 LMH6722SDX/NOPB WSON NHK 14 4500 367.0 367.0 35.0 Pack Materials-Page 2 MECHANICAL DATA NHK0014A SDA14A (Rev A) www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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