LT1253/LT1254 Low Cost Dual and Quad Video Amplifiers U DESCRIPTIO FEATURES Low Cost Current Feedback Amplifiers Differential Gain: 0.03%, RL = 150, VS = 5V Differential Phase: 0.28, RL = 150, 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 UO APPLICATI S 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. RGB Cable Drivers Composite Video Cable Drivers Gain Blocks in IF Stages 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. UO TYPICAL APPLICATI Transient Response 5V VIN + 75 1/2 LT1253 - -5V 75 CABLE RF 620 VOUT RG 620 RF BW = 90MHz RG AT AMPLIFIER OUTPUT. 6dB LESS AT VOUT. 75 AV = 1 + LT1253/54 * TA01 VS = 5V AV = 2 RL = 150 VO = 1V LT1253/54 * TA02 1 LT1253/LT1254 W W W AXI U U ABSOLUTE RATI GS Total Supply Voltage (V + to V -) ............................. 28V Input Current ..................................................... 15mA Output Short-Circuit Duration (Note 1) ........ Continuous Operating Temperature Range LT1253C, LT1254C................................. 0C to 70C Storage Temperature Range ................ - 65C to 150C Junction Temperature (Note 2) ............................ 150C Lead Temperature (Soldering, 10 sec)................. 300C W U U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW OUT A 1 8 V+ -IN A 2 7 OUT B +IN A 3 6 -IN B V- 4 5 +IN B A N8 PACKAGE 8-LEAD PLASTIC DIP B S8 PACKAGE 8-LEAD PLASTIC SOIC TJMAX = 150C, JA = 100C/ W (N) TJMAX = 150C, JA = 150C/ W (S) TOP VIEW OUT A 1 -IN A 2 +IN A 3 V+ 4 LT1253CN8 LT1253CS8 S8 PART MARKING +IN B 5 -IN B 6 OUT B 7 13 -IN D A D 12 +IN D LT1254CN LT1254CS 11 V - 10 +IN C B N PACKAGE 14-LEAD PLASTIC DIP 1253 ORDER PART NUMBER 14 OUT D C 9 -IN C 8 OUT C S PACKAGE 14-LEAD PLASTIC SOIC TJMAX = 150C, JA = 70C/ W (N) TJMAX = 150C, JA = 100C/ W (S) ELECTRICAL CHARACTERISTICS 0C TA 70C, VS = 5V to 12V, unless otherwise noted. Symbol Parameter VOS Input Offset Voltage +IB Noninverting Bias Current - IB Inverting Bias Current AVOL Large-Signal Voltage Gain VS = 5V, VO = 2V, RL = 150 PSRR Power Supply Rejection Ratio VS = 3V to 12V 60 70 dB CMRR Common-Mode Rejection Ratio VS = 5V, VCM = 2V 55 65 dB VOUT Maximum Output Voltage Swing VS = 12V, RL = 500 VS = 5V, RL = 150 7.0 2.5 10.5 3.7 V V IOUT Maximum Output Current IS Supply Current RIN Input Resistance CIN Input Capacitance Power Supply Range SR 2 CONDITIONS MIN 560 30 Per Amplifier TYP MAX 5 15 mV 1 15 A 20 100 A 1500 1 V/V 55 6 mA 11 10 mA M 3 2 4 Dual Single UNITS pF 12 24 V V Channel Separation f = 10MHz 88 dB Input Slew Rate AV = 1 125 V/s Output Slew Rate AV = 2 250 V/s LT1253/LT1254 ELECTRICAL CHARACTERISTICS 0C TA 70C, VS = 5V to 12V, unless otherwise noted. Symbol Parameter tr Small-Signal Rise Time VS = 12V, AV = 2 3.5 ns Rise and Fall Time VS = 5V, AV = 2, VOUT = 1VP-P 5.8 ns Propagation Delay VS = 5V, AV = 2 3.5 ns tp CONDITIONS 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: MIN TYP MAX UNITS LT1253CN8: TJ = TA + (PD x 100C/W) LT1253CS8: TJ = TA + (PD x 150C/W) LT1254CN: TJ = TA + (PD x 70C/W) LT1254CS: TJ = TA + (PD x 100C/W) W U TYPICAL AC PERFOR A CE BANDWIDTH VS AV RL RF RG Small Signal - 3dB BW (MHz) Small Signal - 0.1dB BW (MHz) Small Signal Peaking (dB) 12 1 1000 1100 None 270 51 3.4 12 1 150 1000 None 204 48 1.3 12 -1 1000 750 150 110 59 0.1 12 -1 150 768 768 89 50 0.1 12 2 1000 715 715 179 76 0.3 12 2 150 715 715 117 62 0 12 5 1000 680 180 106 42 0 12 5 150 680 180 90 47 0 12 10 1000 620 68.1 89 49 0.1 12 10 150 620 68.1 80 46 0.1 5 1 1000 787 None 218 53 1.5 5 1 150 787 None 158 91 0.1 5 -1 1000 715 715 76 28 0.1 5 -1 150 715 715 70 30 0.1 5 2 1000 620 620 117 58 0.1 5 2 150 620 620 92 52 0.1 5 5 1000 620 150 82 36 0 5 5 150 620 150 72 34 0 5 10 1000 562 61.9 70 35 0 5 10 150 562 61.9 65 28 0 NTSC VIDEO (Note 1) VS AV RL RF RG DIFFERENTIAL GAIN DIFFERENTIAL PHASE 12 2 1000 750 750 0.01% 0.03 12 2 150 750 750 0.01% 0.12 5 2 1000 750 750 0.03% 0.18 5 2 150 750 750 0.03% 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 amplifier stages were cascaded giving an effective resolution of 0.01% and 0.01. 3 LT1253/LT1254 U W TYPICAL PERFOR A CE CHARACTERISTICS Output Saturation Voltage vs Temperature Supply Current vs Supply Voltage V+ -55C 7 25C 6 5 125C 4 175C 3 2 1 2 4 8 10 12 14 6 SUPPLY VOLTAGE (V) 16 -1.0 RL = 2V VS 12V 1.0 0.5 18 50 0 25 75 TEMPERATURE (C) Settling Time to 10mV vs Output Step 100 6 DISTORTION (dBc) 4 2 VS = 12V RF = RG = 1k -2 -4 -6 2ND -40 3RD -50 40 60 SETTLING TIME (ns) 80 100 10 FREQUENCY (MHz) 1 LT1253/54 * TPC04 40 NEGATIVE 20 10 en 1k 10k FREQUENCY (Hz) 100k LT1253/54 * TPC07 100M 70 10 1.0 RF = RG = 2k RF = RG = 750 0.1 0.01 +in 1M 10M FREQUENCY (Hz) Output Short-Circuit Current vs Temperature OUTPUT SHORT-CIRCUIT CURRENT (mA) -in 100k LT1253/54 * TPC06 100 OUTPUT IMPEDANCE () SPOT NOISE (nV/Hz OR pA/Hz) POSITIVE 0 10k 100 VS = 12V 4 60 Output Impedance vs Frequency 100 100 125 VS = 12V RL = 100 RF = RG = 750 LT1253/54 * TPC05 Spot Noise Voltage and Current vs Frequency 1 10 100 LT1253/54 * TPC03 -70 20 0 25 50 75 TEMPERATURE (C) INVERTING -10 0 1.0 Power Supply Rejection vs Frequency -60 NONINVERTING V - = -2V TO -12V 1.5 80 VS = 12V VO = 2VP-P RL = 100 RF = 750 AV = 10dB INVERTING -30 -8 2.0 V- - 50 -25 125 -20 0 -2.0 2nd and 3rd Harmonic Distortion vs Frequency 10 NONINVERTING V + = 2V TO 12V -1.5 LT1253/54 * TPC02 LT1253/54 * TPC01 8 -1.0 0.5 V- -50 -25 0 0 - 0.5 -0.5 POWER SUPPLY REJECTION (dB) SUPPLY CURRENT (mA) 8 OUTPUT SATURATION VOLTAGE (V) 9 V+ COMMON-MODE RANGE (V) 10 OUTPUT STEP (V) Input Common-Mode Limit vs Temperature 0.001 10k 100k 1M 10M FREQUENCY (Hz) 100M LT1253/54 * TPC08 60 50 40 30 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C) LT1253/54 * TPC09 LT1253/LT1254 U W TYPICAL PERFOR A CE CHARACTERISTICS 12V Frequency Response 5V Frequency Response 4 3 PHASE 0 -20 4 -20 -40 3 -60 2 -80 GAIN 0 -100 -40 PHASE -80 0 -100 GAIN -1 -1 -120 -2 -140 -2 -160 -3 -180 -4 -200 -5 1M -3 -4 -5 1M VS = 12V AV = 1 RL = 150 RF = 1k 10M 100M FREQUENCY (Hz) 1G -140 -160 -180 -200 10M 100M FREQUENCY (Hz) 5V Frequency Response 0 11 -20 11 -40 10 -60 9 10 PHASE GAIN (dB) -100 6 -120 4 3 2 1M 10M 100M FREQUENCY (Hz) -40 PHASE -80 7 -100 6 -120 -160 4 -180 3 -200 2 1M 1G VS = 5V AV = 2 RL = 150 RF = 620 RG = 620 -140 GAIN -160 -180 -200 10M 100M FREQUENCY (Hz) 1G LT1253/54 * TPC13 LT1253/54 * TPC12 12V Frequency Response 5V Frequency Response 26 0 26 0 25 -20 25 -20 PHASE -40 24 -60 23 21 -100 20 19 18 17 16 1M -120 VS = 12V AV = 10 RL = 150 RF = 620 RG = 68.1 GAIN 10M 100M FREQUENCY (Hz) 1G LT1253/54 * TPC14 -40 PHASE -60 22 -80 21 -100 20 -140 19 -160 18 -180 17 -200 16 1M -120 VS = 5V AV = 10 RL = 150 RF = 562 RG = 61.9 PHASE (DEG) -80 PHASE (DEG) 22 GAIN (dB) 24 23 GAIN (dB) -60 8 5 -140 GAIN 0 -20 PHASE (DEG) -80 7 PHASE (DEG) 8 GAIN (dB) 12 12 VS = 12V AV = 2 RL = 150 RF = 715 RG = 715 1G LT1253/54 * TPC11 12V Frequency Response 5 -120 VS = 5V AV = 1 RL = 150 RF = 787 LT1253/54 * TPC10 9 -60 1 PHASE (DEG) 1 5 PHASE (DEG) GAIN (dB) 2 0 GAIN (dB) 5 -140 GAIN 10M 100M FREQUENCY (Hz) -160 -180 -200 1G LT1253/54 * TPC15 5 LT1253/LT1254 U W TYPICAL PERFOR A CE CHARACTERISTICS Transient Response Transient Response VS = 5V AV = 1 RL = 150 RF = 787 VO = 1V LT1253/54 * TPC16 RF = 562 RG = 61.9 VO = 1.5V VS = 5V AV = 10 RL = 150 LT1253/54 * TPC17 U U W U APPLICATIO S I FOR ATIO Power Dissipation PDMAX = 2 x VS x ISMAX + (VS - VOMAX) x VOMAX/RL 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. PDMAX = 2 x 12V x 7mA + (12V - 2V) x 2V/150 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 150C 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 150. 6 = 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 150C/W junction to ambient in still air. Temperature Rise = PDMAX x RJA = 0.602W x 150C/W = 90.3C The maximum junction temperature allowed in the plastic package is 150C. Therefore the maximum ambient allowed is the maximum junction temperature less the temperature rise. Maximum Ambient = 150C - 90.3C = 59.7C Note that this is less than the maximum of 70C 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 U U W U 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: MAX POWER at MAX TA 1. The maximum ambient is 70C. 2. The load is a double-terminated video cable, 150. 3. The maximum output voltage is 2V (peak or DC). LT1253CN8 VS < 14 (Abs Max) 0.800W LT1253CS8 VS < 10.6 0.533W LT1254CN VS < 11.4 1.143W LT1254CS VS < 7.6 0.727W W W SI PLIFIED SCHE ATIC One Amplifier V+ -IN +IN VOUT V- LT1253/54 * SS U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.300 - 0.320 (7.620 - 8.128) 0.009 - 0.015 (0.229 - 0.381) ( +0.025 0.325 -0.015 +0.635 8.255 -0.381 ) 0.045 - 0.065 (1.143 - 1.651) 0.130 0.005 (3.302 0.127) 0.400 (10.160) MAX 8 7 6 5 0.065 (1.651) TYP 0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254) 0.250 0.010 (6.350 0.254) 0.125 (3.175) MIN 0.020 (0.508) MIN 1 2 3 0.018 0.003 (0.457 0.076) 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. 4 N8 0392 7 LT1253/LT1254 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N Package 14-Lead Plastic DIP 0.300 - 0.325 (7.620 - 8.255) 0.045 - 0.065 (1.143 - 1.651) 0.015 (0.380) MIN 0.130 0.005 (3.302 0.127) 0.770 (19.558) MAX 0.065 (1.651) TYP ( +0.635 8.255 -0.381 ) 13 12 11 10 9 8 1 2 3 4 5 6 7 0.260 0.010 (6.604 0.254) 0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015 14 0.075 0.015 (1.905 0.381) 0.018 0.003 (0.457 0.076) 0.125 (3.175) MIN 0.100 0.010 (2.540 0.254) N14 0392 S8 Package 8-Lead SOIC 0.189 - 0.197 (4.801 - 5.004) 0.010 - 0.020 x 45 (0.254 - 0.508) 8 0.053 - 0.069 (1.346 - 1.752) 0.008 - 0.010 (0.203 - 0.254) 0.016 - 0.050 0.406 - 1.270 0- 8 TYP 7 6 5 0.004 - 0.010 (0.101 - 0.254) 0.014 - 0.019 (0.355 - 0.483) 0.050 (1.270) BSC 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157 (3.810 - 3.988) 1 2 3 4 SO8 0392 S Package 14-Lead SOIC 0.337 - 0.344 (8.560 - 8.738) 0.010 - 0.020 x 45 (0.254 - 0.508) 14 0.053 - 0.069 (1.346 - 1.752) 0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP 0.016 - 0.050 0.406 - 1.270 0.014 - 0.019 (0.355 - 0.483) 0.050 (1.270) TYP 12 11 10 9 8 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157 (3.810 - 3.988) 1 8 13 0.004 - 0.010 (0.101 - 0.254) Linear Technology Corporation 2 3 4 5 6 7 SO14 0392 LT/GP 0193 10K REV 0 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977 LINEAR TECHNOLOGY CORPORATION 1993