LT1253CS8

LT1253/LT1254 Low Cost Dual and Quad Video Amplifiers FEATURES s s s s s s s s DESCRIPTIO Low Cost Current Feedback Amplifiers Differential Gain: 0.03%, RL = 150Ω, VS = ± 5V Differential Phase: 0.28°, RL = 150Ω, VS = ± 5V Flat to 30MHz, 0.1dB 90MHz Bandwidth on ± 5V Wide Supply Range: ± 2V(4V) to ± 14V(28V) Low Power: 60mW per Amplifier at ± 5V The LT1253 is a low cost dual current feedback amplifier for video applications. The LT1254 is a quad version of the LT1253. The amplifiers are completely isolated except for the power supply pins and therefore have excellent isolation, over 94dB at 5MHz. Dual and quad amplifiers significantly reduce costs compared with singles; the number of insertions is reduced and fewer supply bypass capacitors are required. In addition, these duals and quads cost less per amplifier than single video amplifiers. The LT1253/LT1254 amplifiers are ideal for driving low impedance loads such as cables and filters. The wide bandwidth and high slew rate of these amplifiers make driving RGB signals between PCs and workstations easy. The excellent linearity of these amplifiers makes them ideal for composite video. The LT1253 is available in 8-pin DIPs and the S8 surface mount package. The LT1254 is available in 14-pin DIPs and the S14 surface mount package. Both parts have the industry standard dual and quad op amp pin out. For higher performance, see the LT1229/LT1230. APPLICATI s s s S RGB Cable Drivers Composite Video Cable Drivers Gain Blocks in IF Stages TYPICAL APPLICATI 5V VIN + 1/2 LT1253 – –5V RF 620Ω RG 620Ω Transient Response 75Ω 75Ω CABLE VOUT 75Ω AV = 1 + RF BW = 90MHz RG AT AMPLIFIER OUTPUT. 6dB LESS AT VOUT. LT1253/54 • TA01 VS = ±5V AV = 2 RL = 150Ω VO = 1V U LT1253/54 • TA02 UO UO 1 LT1253/LT1254 ABSOLUTE AXI U RATI GS Storage Temperature Range ................ – 65°C to 150°C Junction Temperature (Note 2) ............................ 150°C Lead Temperature (Soldering, 10 sec)................. 300°C Total Supply Voltage (V + to V –) ............................. 28V Input Current ..................................................... ± 15mA Output Short-Circuit Duration (Note 1) ........ Continuous Operating Temperature Range LT1253C, LT1254C................................. 0°C to 70°C PACKAGE/ORDER I FOR ATIO TOP VIEW OUT A –IN A +IN A V– 1 2 A 3 4 B 6 5 –IN B +IN B 8 7 V+ OUT B ORDER PART NUMBER LT1253CN8 LT1253CS8 S8 PART MARKING 1253 N8 PACKAGE 8-LEAD PLASTIC DIP S8 PACKAGE 8-LEAD PLASTIC SOIC TJMAX = 150°C, θJA = 100°C/ W (N) TJMAX = 150°C, θJA = 150°C/ W (S) ELECTRICAL CHARACTERISTICS Symbol VOS +IB – IB AVOL PSRR CMRR VOUT IOUT IS RIN CIN Parameter Input Offset Voltage Noninverting Bias Current Inverting Bias Current Large-Signal Voltage Gain Power Supply Rejection Ratio Common-Mode Rejection Ratio Maximum Output Voltage Swing Maximum Output Current Supply Current Input Resistance Input Capacitance Power Supply Range Channel Separation SR Input Slew Rate Output Slew Rate Dual Single 0°C ≤ TA ≤ 70°C, VS = ± 5V to ± 12V, unless otherwise noted. MIN TYP 5 1 20 MAX 15 15 100 UNITS mV µA µA V/V dB dB V V mA 11 mA MΩ pF ± 12 24 88 125 250 V V dB V/µs V/µs CONDITIONS VS = ± 5V, VO = ± 2V, RL = 150Ω VS = ± 3V to ± 12V VS = ± 5V, VCM = ± 2V VS = ±12V, RL = 500Ω VS = ± 5V, RL = 150Ω Per Amplifier f = 10MHz AV = 1 AV = 2 2 U U W WW U W TOP VIEW OUT A 1 2 3 4 5 6 7 B C A D 14 OUT D 13 –IN D 12 +IN D 11 V – 10 +IN C 9 8 –IN C OUT C ORDER PART NUMBER LT1254CN LT1254CS –IN A +IN A V+ +IN B –IN B OUT B N PACKAGE 14-LEAD PLASTIC DIP S PACKAGE 14-LEAD PLASTIC SOIC TJMAX = 150°C, θJA = 70°C/ W (N) TJMAX = 150° C, θJA = 100°C/ W (S) 560 60 55 ± 7.0 ± 2.5 30 1 ±2 4 1500 70 65 ± 10.5 ± 3.7 55 6 10 3 LT1253/LT1254 ELECTRICAL CHARACTERISTICS Symbol tr tp Parameter Small-Signal Rise Time Rise and Fall Time Propagation Delay 0°C ≤ TA ≤ 70°C, VS = ± 5V to ± 12V, unless otherwise noted. MIN TYP 3.5 5.8 3.5 MAX UNITS ns ns ns CONDITIONS VS = ± 12V, AV = 2 VS = ± 5V, AV = 2, VOUT = 1VP-P VS = ± 5V, AV = 2 Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LT1253CN8: TJ = TA + (PD × 100°C/W) LT1253CS8: TJ = TA + (PD × 150°C/W) LT1254CN: TJ = TA + (PD × 70°C/W) LT1254CS: TJ = TA + (PD × 100°C/W) TYPICAL AC PERFOR A CE BANDWIDTH VS ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ±5 ±5 ±5 ±5 ±5 ±5 ±5 ±5 ±5 ±5 AV 1 1 –1 –1 2 2 5 5 10 10 1 1 –1 –1 2 2 5 5 10 10 RL 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 RF 1100 1000 750 768 715 715 680 680 620 620 787 787 715 715 620 620 620 620 562 562 RG None None 150 768 715 715 180 180 68.1 68.1 None None 715 715 620 620 150 150 61.9 61.9 Small Signal – 3dB BW (MHz) 270 204 110 89 179 117 106 90 89 80 218 158 76 70 117 92 82 72 70 65 Small Signal – 0.1dB BW (MHz) 51 48 59 50 76 62 42 47 49 46 53 91 28 30 58 52 36 34 35 28 Small Signal Peaking (dB) 3.4 1.3 0.1 0.1 0.3 0 0 0 0.1 0.1 1.5 0.1 0.1 0.1 0.1 0.1 0 0 0 0 NTSC VIDEO (Note 1) VS ± 12 ±12 ±5 ±5 AV 2 2 2 2 RL 1000 150 1000 150 RF 750 750 750 750 RG 750 750 750 750 DIFFERENTIAL GAIN 0.01% 0.01% 0.03% 0.03% DIFFERENTIAL PHASE 0.03° 0.12° 0.18° 0.28° Note 1: Differential Gain and Phase are measured using a Tektronix TSG 120 YC/NTSC signal generator and a Tektronix 1780R Video Measurement Set. The resolution of this equipment is 0.1% and 0.1°. Ten identical UW amplifier stages were cascaded giving an effective resolution of 0.01% and 0.01°. 3 LT1253/LT1254 TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 10 OUTPUT SATURATION VOLTAGE (V) V+ –0.5 9 8 SUPPLY CURRENT (mA) –55°C 25°C 125°C COMMON-MODE RANGE (V) 7 6 5 4 3 2 1 0 0 2 4 8 10 12 14 6 SUPPLY VOLTAGE (±V) 16 18 175°C LT1253/54 • TPC01 Settling Time to 10mV vs Output Step 10 8 6 DISTORTION (dBc) NONINVERTING INVERTING –30 POWER SUPPLY REJECTION (dB) OUTPUT STEP (V) 4 2 0 –2 –4 –6 –8 –10 0 20 40 60 SETTLING TIME (ns) 80 100 NONINVERTING INVERTING VS = ±12V RF = RG = 1k LT1253/54 • TPC04 Spot Noise Voltage and Current vs Frequency 100 OUTPUT IMPEDANCE (Ω) –in 10 OUTPUT SHORT-CIRCUIT CURRENT (mA) SPOT NOISE (nV/√Hz OR pA/√Hz) 10 en +in 1 10 100 1k 10k FREQUENCY (Hz) 4 UW LT1253/54 • TPC07 Output Saturation Voltage vs Temperature V+ – 0.5 –1.0 –1.5 –2.0 Input Common-Mode Limit vs Temperature –1.0 RL = ∞ ± 2V ≤ VS ≤ ±12V V + = 2V TO 12V 2.0 1.5 1.0 0.5 V– – 50 –25 V – = – 2V TO –12V 1.0 0.5 V– –50 –25 50 0 25 75 TEMPERATURE (°C) 100 125 0 25 50 75 TEMPERATURE (°C) 100 125 LT1253/54 • TPC02 LT1253/54 • TPC03 2nd and 3rd Harmonic Distortion vs Frequency –20 VS = ±12V VO = 2VP-P RL = 100Ω RF = 750Ω AV = 10dB Power Supply Rejection vs Frequency 80 VS = ±12V RL = 100Ω RF = RG = 750Ω POSITIVE 40 60 2ND –40 3RD –50 NEGATIVE 20 –60 –70 1 10 FREQUENCY (MHz) 100 LT1253/54 • TPC05 0 10k 100k 1M 10M FREQUENCY (Hz) 100M LT1253/54 • TPC06 Output Impedance vs Frequency 100 VS = ±12V 70 Output Short-Circuit Current vs Temperature 60 1.0 RF = RG = 2k 0.1 RF = RG = 750Ω 50 0.01 40 100k 0.001 10k 100k 1M 10M FREQUENCY (Hz) 100M 30 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) LT1253/54 • TPC09 LT1253/54 • TPC08 LT1253/LT1254 TYPICAL PERFOR A CE CHARACTERISTICS ± 12V Frequency Response 5 4 3 2 PHASE 0 –20 –40 –60 GAIN (dB) 0 –1 –2 –3 –4 –5 1M VS = ± 12V AV = 1 RL = 150Ω RF = 1k 10M 100M FREQUENCY (Hz) GAIN GAIN (dB) 1 ± 12V Frequency Response 12 11 10 9 PHASE 0 –20 –40 –60 GAIN (dB) GAIN (dB) 8 7 6 5 4 3 2 1M VS = ±12V AV = 2 RL = 150Ω RF = 715Ω RG = 715Ω GAIN 10M 100M FREQUENCY (Hz) ± 12V Frequency Response 26 25 24 23 GAIN (dB) 21 20 19 18 17 16 1M VS = ±12V AV = 10 RL = 150Ω RF = 620Ω RG = 68.1Ω GAIN GAIN (dB) 22 10M 100M FREQUENCY (Hz) UW ± 5V Frequency Response 5 4 3 2 PHASE (DEG) 0 –20 –40 PHASE –60 PHASE (DEG) –80 –100 –120 –140 –160 –180 –200 1G LT1253/54 • TPC10 1 0 –1 –2 –3 –4 –5 1M VS = ± 5V AV = 1 RL = 150Ω RF = 787Ω 10M 100M FREQUENCY (Hz) 1G LT1253/54 • TPC11 –80 –100 GAIN –120 –140 –160 –180 –200 ± 5V Frequency Response 12 11 10 9 PHASE 0 –20 –40 –60 PHASE (DEG) PHASE (DEG) –80 –100 – 120 –140 –160 –180 –200 1G LT1253/54 • TPC12 8 7 6 5 4 3 2 1M VS = ± 5V AV = 2 RL = 150Ω RF = 620Ω RG = 620Ω GAIN –80 –100 – 120 –140 –160 –180 –200 10M 100M FREQUENCY (Hz) 1G LT1253/54 • TPC13 ± 5V Frequency Response 0 –20 –40 26 25 24 23 PHASE (DEG) 0 –20 –40 PHASE –60 PHASE –60 –80 –100 – 120 –140 –160 –180 –200 1G LT1253/54 • TPC14 PHASE (DEG) 22 21 20 19 18 17 16 1M VS = ± 5V AV = 10 RL = 150Ω RF = 562Ω RG = 61.9Ω GAIN –80 –100 – 120 –140 –160 –180 –200 1G LT1253/54 • TPC15 10M 100M FREQUENCY (Hz) 5 LT1253/LT1254 TYPICAL PERFOR A CE CHARACTERISTICS Transient Response Transient Response VS = ± 5V AV = 1 RL = 150Ω RF = 787Ω VO = 1V APPLICATIO S I FOR ATIO Power Dissipation The LT1253/LT1254 amplifiers combine high speed and large output current drive into very small packages. Because these amplifiers work over a very wide supply range, it is possible to exceed the maximum junction temperature under certain conditions. To insure that the LT1253/ LT1254 are used properly, we must calculate the worst case power dissipation, define the maximum ambient temperature, select the appropriate package and then calculate the maximum junction temperature. The worst case amplifier power dissipation is the total of the quiescent current times the total power supply voltage plus the power in the IC due to the load. The quiescent supply current of the LT1253/LT1254 has a strong negative temperature coefficient. The supply current of each amplifier at 150°C is less than 7mA and typically is only 4.5mA. The power in the IC due to the load is a function of the output voltage, the supply voltage and load resistance. The worst case occurs when the output voltage is at half supply, if it can go that far, or its maximum value if it cannot reach half supply. For example, let’s calculate the worst case power dissipation in a video cable driver operating on a ±12V supply that delivers a maximum of 2V into 150Ω. 6 U W UW LT1253/54 • TPC16 RF = 562Ω RG = 61.9Ω VO = 1.5V VS = ± 5V AV = 10 RL = 150Ω LT1253/54 • TPC17 UU PDMAX = 2 × VS × ISMAX + (VS – VOMAX) × VOMAX/RL PDMAX = 2 × 12V × 7mA + (12V – 2V) × 2V/150 = 0.168 + 0.133 = 0.301 Watt per Amp Now if that is the dual LT1253, the total power in the package is twice that, or 0.602W. We now must calculate how much the die temperature will rise above the ambient. The total power dissipation times the thermal resistance of the package gives the amount of temperature rise. For the above example, if we use the S8 surface mount package, the thermal resistance is 150°C/W junction to ambient in still air. Temperature Rise = PDMAX × RθJA = 0.602W × 150°C/W = 90.3°C The maximum junction temperature allowed in the plastic package is 150°C. Therefore the maximum ambient allowed is the maximum junction temperature less the temperature rise. Maximum Ambient = 150°C – 90.3°C = 59.7°C Note that this is less than the maximum of 70°C that is specified in the absolute maximum data listing. In order to use this package at the maximum ambient we must lower the supply voltage or reduce the output swing. LT1253/LT1254 APPLICATIO S I FOR ATIO As a guideline to help in the selection of the LT1253/ LT1254, the following table describes the maximum supply voltage that can be used with each part based on the following assumptions: 1. The maximum ambient is 70°C. 2. The load is a double-terminated video cable, 150Ω. 3. The maximum output voltage is 2V (peak or DC). SI PLIFIED SCHE ATIC One Amplifier V+ +IN PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. 0.300 – 0.320 (7.620 – 8.128) 0.045 – 0.065 (1.143 – 1.651) 0.009 – 0.015 (0.229 – 0.381) 0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN ( +0.025 0.325 –0.015 +0.635 8.255 –0.381 ) 0.045 ± 0.015 (1.143 ± 0.381) 0.100 ± 0.010 (2.540 ± 0.254) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U MAX POWER at MAX TA LT1253CN8 LT1253CS8 LT1254CN LT1254CS VS < ± 14 (Abs Max) VS < ± 10.6 VS < ± 11.4 VS < ± 7.6 0.800W 0.533W 1.143W 0.727W –IN VOUT V– LT1253/54 • SS U W W UU W N8 Package 8-Lead Plastic DIP 0.400 (10.160) MAX 8 7 6 5 0.130 ± 0.005 (3.302 ± 0.127) 0.250 ± 0.010 (6.350 ± 0.254) 1 2 3 4 0.018 ± 0.003 (0.457 ± 0.076) N8 0392 7 LT1253/LT1254 PACKAGE DESCRIPTIO U Dimensions in inches (millimeters) unless otherwise noted. N Package 14-Lead Plastic DIP 0.065 (1.651) TYP 14 13 12 0.770 (19.558) MAX 11 10 9 8 0.300 – 0.325 (7.620 – 8.255) 0.015 (0.380) MIN 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) 0.009 – 0.015 (0.229 – 0.381) +0.025 0.325 –0.015 +0.635 8.255 –0.381 0.260 ± 0.010 (6.604 ± 0.254) ( ) 0.075 ± 0.015 (1.905 ± 0.381) 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) 1 0.125 (3.175) MIN 2 3 4 5 6 7 N14 0392 S8 Package 8-Lead SOIC 0.189 – 0.197 (4.801 – 5.004) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0.150 – 0.157 (3.810 – 3.988) 8 7 6 5 0°– 8° TYP 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.270) BSC 1 2 3 4 SO8 0392 S Package 14-Lead SOIC 0.337 – 0.344 (8.560 – 8.738) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0.150 – 0.157 (3.810 – 3.988) 14 13 12 11 10 9 8 0° – 8° TYP 0.016 – 0.050 0.406 – 1.270 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.270) TYP 1 2 3 4 5 6 7 SO14 0392 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 LT/GP 0193 10K REV 0 © LINEAR TECHNOLOGY CORPORATION 1993