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| LT1395/LT1396/LT1397 Single/Dual/Quad 400MHz Current Feedback Amplifier FEATURES DESCRIPTIO 400MHz Bandwidth on 5V (AV = 1) 350MHz Bandwidth on 5V (AV = 2, -1) 0.1dB Gain Flatness: 100MHz (AV = 1, 2 and -1) High Slew Rate: 800V/s Wide Supply Range: 2V(4V) to 6V(12V) 80mA Output Current Low Supply Current: 4.6mA/Amplifier LT1395: SO-8, TSOT23-5 and TSOT23-6 Packages LT1396: SO-8, MSOP and Tiny 3mm x 3mm x 0.75mm DFN-8 Packages LT1397: SO-14, SSOP-16 and Tiny 4mm x 3mm x 0.75mm DFN-14 Packages The LT (R)1395/LT1396/LT1397 are single/dual/quad 400MHz current feedback amplifiers with an 800V/s slew rate and the ability to drive up to 80mA of output current. The LT1395/LT1396/LT1397 operate on all supplies from a single 4V to 6V. At 5V, they draw 4.6mA of supply current per amplifier. The LT1395CS6 also adds a shutdown pin. When disabled, the LT1395CS6 draws virtually zero supply current and its output becomes high impedance. The LT1395CS6 will turn on in only 30ns and turn off in 40ns, making it ideal in spread spectrum and portable equipment applications. For space limited applications, the LT1395 is available in TSOT-23 packages, the LT1396 is available in a tiny 3mm x 3mm x 0.75mm dual fine pitch leadless DFN package, and the LT1397 is available in a tiny 4mm x 3mm x 0.75mm DFN package. The LT1395/LT1396/LT1397 are manufactured on Linear Technology's proprietary complementary bipolar process. They have standard single/dual/quad pinouts and they are optimized for use on supply voltages of 5V. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. APPLICATIO S Cable Drivers Video Amplifiers MUX Amplifiers High Speed Portable Equipment IF Amplifiers TYPICAL APPLICATIO R G1 1.02k R F1 255 Unity-Gain Video Loop-Through Amplifier R G2 63.4 R F2 255 10 0 - 3.01k VIN - 1/2 LT1396 - 3.01k VIN+ 1/2 LT1396 -10 GAIN (dB) VOUT -20 -30 -40 + 0.67pF + 0.67pF 12.1k 12.1k HIGH INPUT RESISTANCE DOES NOT LOAD CABLE EVEN WHEN POWER IS OFF BNC INPUTS 1% RESISTORS FOR A GAIN OF G: VOUT = G (VIN+ - VIN -) R F1 = RF2 R G1 = (5G - 1) RF2 R F2 RG2 = (5G - 1) TRIM CMRR WITH RG1 1395/6/7 TA01 -50 -60 100 U Loop-Through Amplifier Frequency Response NORMAL SIGNAL COMMON MODE SIGNAL 1k 10k 100k U U 1M 10M 100M 1G 1395/6/7 TA02 FREQUENCY (Hz) 139567fc 1 LT1395/LT1396/LT1397 ABSOLUTE AXI U V -) RATI GS Total Supply Voltage (V + to ........................... 12.6V Input Current (Note 2) ....................................... 10mA Output Current ................................................. 100mA Differential Input Voltage (Note 2) ........................... 5V Output Short-Circuit Duration (Note 3) ........ Continuous Operating Temperature Range (Note 4) LT1395C/LT1396C/LT1397C ............. - 40C to 85C LT1397H ......................................... - 40C to 125C PI CO FIGURATIO TOP VIEW OUT A 1 -IN A 2 +IN A 3 V - 8 7 6 5 V+ OUT B -IN B +IN B 4 DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN TJMAX = 125C, JA = 160C/W (NOTE 3) UNDERSIDE METAL CONNECTED TO V- (PCB CONNECTION OPTIONAL) TOP VIEW OUT A -IN A +IN A V- 1 2 3 4 - + - + 8 7 6 5 V+ OUT B -IN B +IN B MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 250C/W 2 U WW U W (Note 1) Specified Temperature Range (Note 5) LT1395C/LT1396C/LT1397C .................. 0C to 70C LT1397H ......................................... - 40C to 125C Storage Temperature Range ................. - 65C to 150C Storage Temperature Range (DD Package) ................................... - 65C to 125C Junction Temperature (Note 6) ............................ 150C Junction Temperature (DD Package) (Note 6) ..... 125C Lead Temperature (Soldering, 10 sec)................. 300C U U TOP VIEW TOP VIEW OUT A -IN A +IN A V+ +IN B -IN B OUT B 1 2 3 4 5 6 7 14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 -IN C 8 OUT C OUT A -IN A +IN A V+ +IN B -IN B OUT B NC 1 2 3 4 5 6 7 8 + - - + 16 OUT D - 15 -IN D + 14 +IN D 13 V - + 12 +IN C - 11 -IN C 10 OUT C 9 NC DE14 PACKAGE 14-LEAD (4mm x 3mm) PLASTIC DFN GN PACKAGE 16-LEAD PLASTIC SSOP TJMAX = 150C, JA = 135C/W TJMAX = 125C, JA = 43C/W, JC = 4.3C/W EXPOSED PAD (PIN 15) IS V- MUST BE SOLDERED TO PCB TOP VIEW OUT A 1 -IN A 2 +IN A 3 V+ 4 +IN B 5 -IN B 6 OUT B 7 + - - + 14 OUT D - 13 -IN D + 12 +IN D 11 V - + 10 +IN C - 9 -IN C 8 OUT C TOP VIEW OUT 1 V- 2 +IN 3 + - 5 V+ 4 -IN S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150C, JA = 100C/W S5 PACKAGE 5-LEAD PLASTIC TSOT-23 TJMAX = 150C, JA = 250C/W 139567fc LT1395/LT1396/LT1397 PI CO FIGURATIO TOP VIEW OUT 1 V- 2 +IN 3 + - 6 V+ 5 EN 4 -IN S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150C, JA = 230C/W ORDER I FOR ATIO LEAD FREE FINISH LT1396CDD#PBF LT1397CDE#PBF LT1397HDE#PBF LT1397CGN#PBF LT1396CMS8#PBF LT1397CS#PBF LT1395CS5#PBF LT1395CS6#PBF LT1395CS8#PBF LT1396CS8#PBF LEAD BASED FINISH LT1396CDD LT1397CDE LT1397HDE LT1397CGN LT1396CMS8 LT1397CS LT1395CS5 LT1395CS6 LT1395CS8 LT1396CS8 TAPE AND REEL LT1396CDD#TRPBF LT1397CDE#TRPBF LT1397HDE#TRPBF LT1397CGN#TRPBF LT1396CMS8#TRPBF LT1397CS#TRPBF LT1395CS5#TRPBF LT1395CS6#TRPBF LT1395CS8#TRPBF LT1396CS8#TRPBF TAPE AND REEL LT1396CDD#TR LT1397CDE#TR LT1397HDE#TR LT1397CGN#TR LT1396CMS8#TR LT1397CS#TR LT1395CS5#TR LT1395CS6#TR LT1395CS8#TR LT1396CS8#TR Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. *Temperature grades are identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ U U TOP VIEW NC 1 -IN 2 +IN 3 V- 4 - + W U U U TOP VIEW 8 7 6 5 NC V+ OUT NC OUT A 1 -IN A 2 +IN A 3 V- 4 - + 8 7 - + 6 5 V+ OUT B -IN B +IN B S8 PACKAGE (1395) 8-LEAD PLASTIC SO S8 PACKAGE (1396) 8-LEAD PLASTIC SO TJMAX = 150C, JA = 150C/W TJMAX = 150C, JA = 150C/W PART MARKING LABD 1397 1397 1397 LTDY 1397CS LTMA LTMF 1395 1396 PART MARKING LABD 1397 1397 1397 LTDY 1397CS LTMA LTMF 1395 1396 PACKAGE DESCRIPTION 8-Lead (3mm x 3mm) Plastic DFN 14-Lead (4mm x 3mm) Plastic DFN 14-Lead (4mm x 3mm) Plastic DFN 16-Lead Plastic SSOP 8-Lead Plastic MSOP 14-Lead Plastic SO 5-Lead Plastic SOT-23 6-Lead Plastic SOT-23 8-Lead Plastic SO 8-Lead Plastic SO PACKAGE DESCRIPTION 8-Lead (3mm x 3mm) Plastic DFN 14-Lead (4mm x 3mm) Plastic DFN 14-Lead (4mm x 3mm) Plastic DFN 16-Lead Plastic SSOP 8-Lead Plastic MSOP 14-Lead Plastic SO 5-Lead Plastic SOT-23 6-Lead Plastic SOT-23 8-Lead Plastic SO 8-Lead Plastic SO TEMPERATURE RANGE -40C to 85C -40C to 85C -40C to 125C -40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C TEMPERATURE RANGE -40C to 85C -40C to 85C -40C to 125C -40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C -40C to 85C 139567fc 3 LT1395/LT1396/LT1397 The denotes specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25C. For each amplifier: VCM = 0V, VS = 5V, EN = 0.5V, pulse tested, unless otherwise noted. (Note 5) SYMBOL VOS VOS/T IIN+ IIN- en + in - in RIN CIN VINH VINL VOUTH PARAMETER Input Offset Voltage ELECTRICAL CHARACTERISTICS CONDITIONS MIN TYP 1 MAX 10 12 25 30 50 60 UNITS mV mV V/C A A A A nV/Hz pA/Hz pA/Hz M pF V V Input Offset Voltage Drift Noninverting Input Current 15 10 10 Inverting Input Current Input Noise Voltage Density Noninverting Input Noise Current Density Inverting Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range, High Input Voltage Range, Low Output Voltage Swing, High f = 1kHz, RF = 1k, RG = 10, RS = 0 f = 1kHz f = 1kHz VIN = 3.5V VS = 5V VS = 5V, 0V VS = 5V VS = 5V, 0V VS = 5V VS = 5V VS = 5V, 0V VS = 5V VS = 5V VS = 5V, 0V VS = 5V, RL = 150 VS = 5V, RL = 150 VS = 5V, 0V; RL = 150 VS = 5V, RL = 150 VS = 5V, RL = 150 VS = 5V, 0V; RL = 150 VCM = 3.5V VCM = 3.5V VCM = 3.5V VS = 2V to 5V VS = 2V to 5V VS = 2V to 5V VOUT = 2V, RL = 150 VOUT = 2V, RL = 150 RL = 0 VOUT = 0V EN Pin Voltage = 4.5V, RL = 150 (LT1395CS6 only) (LT1395CS6 only) 4.5 6 25 0.3 3.5 1 2.0 4.0 4.0 - 4.0 1.0 3.9 3.7 4.2 4.2 - 4.2 - 3.5 V V V V V VOUTL Output Voltage Swing, Low - 3.9 - 3.7 0.8 V V V V V V VOUTH Output Voltage Swing, High 3.4 3.2 3.6 3.6 - 3.6 VOUTL Output Voltage Swing, Low - 3.4 - 3.2 0.6 V V V dB A/V A/V dB A/V A/V A/V dB k mA CMRR - ICMRR PSRR + IPSRR - IPSRR AV ROL IOUT IS Common Mode Rejection Ratio Inverting Input Current Common Mode Rejection Power Supply Rejection Ratio Noninverting Input Current Power Supply Rejection Inverting Input Current Power Supply Rejection Large-Signal Voltage Gain Transimpedance, VOUT/IIN- Maximum Output Current Supply Current per Amplifier Disable Supply Current 42 52 10 16 22 2 3 7 56 70 1 2 50 40 80 65 100 4.6 0.1 30 6.5 100 110 200 mA A A A V/s 139567fc IEN SR Enable Pin Current Slew Rate (Note 7) AV = - 1, RL = 150 500 800 4 LT1395/LT1396/LT1397 The denotes specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25C. For each amplifier: VCM = 0V, VS = 5V, pulse tested, unless otherwise noted. (Note 5) SYMBOL tON tOFF - 3dB BW PARAMETER Turn-On Delay Time (Note 9) Turn-Off Delay Time (Note 9) -3dB Bandwidth CONDITIONS RF = RG = 255, RL = 100, (LT1395CS6 only) RF = RG = 255, RL = 100, (LT1395CS6 only) AV = 1, RF = 374, RL = 100 AV = 2, RF = RG = 255, RL = 100 AV = 1, RF = 374, RL = 100 AV = 2, RF = RG = 255, RL = 100 RF = RG = 255, RL = 100, VOUT = 1VP-P RF = RG = 255, RL = 100, VOUT = 1VP-P RF = RG = 255, RL = 100, VOUT = 1VP-P 0.1%, AV = - 1, RF = RG = 280, RL = 150 RF = RG = 255, RL = 150 RF = RG = 255, RL = 150 MIN TYP 30 40 400 350 100 100 1.3 2.5 10 25 0.02 0.04 MAX 75 100 UNITS ns ns MHz MHz MHz MHz ns ns % ns % DEG ELECTRICAL CHARACTERISTICS 0.1dB BW 0.1dB Bandwidth tr, tf tPD os tS dG dP Small-Signal Rise and Fall Time Propagation Delay Small-Signal Overshoot Settling Time Differential Gain (Note 8) Differential Phase (Note 8) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: This parameter is guaranteed to meet specified performance through design and characterization. It has not been tested. Note 3: A heat sink may be required depending on the power supply voltage and how many amplifiers have their outputs short circuited. The JA specified for the DD package is with minimal PCB heat spreading metal. Using expanded metal area on all layers of a board reduces this value. Note 4: The LT1395C/LT1396C/LT1397C are guaranteed functional over the operating temperature range of - 40C to 85C. The LT1397H is guaranteed functional over the operating temperature range of -40C to 125C. Note 5: The LT1395C/LT1396C/LT1397C are guaranteed to meet specified performance from 0C to 70C. The LT1395C/LT1396C/LT1397C are designed, characterized and expected to meet specified performance from - 40C and 85C but are not tested or QA sampled at these temperatures. The LT1397H is guaranteed to meet specified performance from -40C to 125C. For guaranteed I-grade parts, consult the factory. Note 6: TJ is calculated from the ambient temperature TA and the power dissipation PD according to the following formula: LT1395CS5: TJ = TA + (PD * 250C/W) LT1396CS6: TJ = TA + (PD * 230C/W) LT1395CS8: TJ = TA + (PD * 150C/W) LT1396CS8: TJ = TA + (PD * 150C/W) LT1396CMS8: TJ = TA + (PD * 250C/W) LT1396CDD: TJ = TA + (PD * 160C/W) LT1397CS14: TJ = TA + (PD * 100C/W) LT1397CGN16: TJ = TA + (PD * 135C/W) LT1397CDE: TJ = TA + (PD * 43C/W) LT1397HDE: TJ = TA + (PD * 43C/W) Note 7: Slew rate is measured at 2V on a 3V output signal. Note 8: Differential gain and phase are measured using a Tektronix TSG120YC/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. Note 9: For LT1395CS6, turn-on delay time (tON) is measured from control input to appearance of 1V(50%) at the output, for VIN = 1V and AV = 2. Likewise, turn-off delay time (tOFF) is measured from control input to appearance of 1V(50%) on the output for VIN = 1V and AV = 2. This specification is guaranteed by design and characterization. 139567fc 5 LT1395/LT1396/LT1397 TYPICAL AC PERFOR A CE VS (V) 5 5 5 5 5 5 5 AV 1 2 -1 3 5 10 10 RL () 100 100 100 500 500 500 500 RF () 374 255 280 221 100 90.9 90.9 RG () - 255 280 110 24.9 10 10||100pF SMALL SIGNAL - 3dB BW (MHz) 400 350 350 300 210 65 100 SMALL SIGNAL 0.1dB BW (MHz) 100 100 100 100 50 10 50 SMALL SIGNAL PEAKING (dB) 0.1 0.1 0.1 0.1 0.0 0.0 0.1 TYPICAL PERFOR A CE CHARACTERISTICS Closed-Loop Gain vs Frequency (AV = 1) Closed-Loop Gain vs Frequency (AV = 2) Closed-Loop Gain vs Frequency (AV = - 1) 0 GAIN (dB) GAIN (dB) -4 -6 GAIN (dB) 1M 10M 100M VS = 5V FREQUENCY (Hz) VIN = -10dBm RF = RG = 255 RL = 100 1G 1395/6/7 G02 -2 1M 10M 100M VS = 5V FREQUENCY (Hz) VIN = -10dBm RF = 374 RL = 100 1G 1395/6/7 G01 Large-Signal Transient Response (AV = 1) OUTPUT (1V/DIV) OUTPUT (1V/DIV) VS = 5V VIN = 2.5V RF = 374 RL = 100 TIME (10ns/DIV) 1395/6/7 G04 VS = 5V TIME (10ns/DIV) VIN = 1.25V RF = RG = 255 RL = 100 1395/6/7 G05 OUTPUT (1V/DIV) 6 UW UW 6 4 2 0 0 -2 -4 -6 1M 10M 100M VS = 5V FREQUENCY (Hz) VIN = -10dBm RF = RG = 280 RL = 100 1G 1395/6/7 G03 Large-Signal Transient Response (AV = 2) Large-Signal Transient Response (AV = - 1) VS = 5V TIME (10ns/DIV) VIN = 2.5V RF = RG = 280 RL = 100 1395/6/7 G06 139567fc LT1395/LT1396/LT1397 TYPICAL PERFOR A CE CHARACTERISTICS 2nd and 3rd Harmonic Distortion vs Frequency TA = 25C 40 RF = RG = 255 RL = 100 50 VS = 5V VOUT = 2VPP 60 70 80 90 100 110 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M HD3 HD2 30 8 7 OUTPUT VOLTAGE (VP-P) DISTORTION (dB) PSRR (dB) Input Voltage Noise and Current Noise vs Frequency 1000 INPUT NOISE (nV/Hz OR pA/Hz) 100 100 OUTPUT IMPEDANCE () 10 OUTPUT IMPEDANCE (DISABLED) () -in 10 en +in 1 10 30 100 300 1k 3k 10k 30k 100k FREQUENCY (Hz) 1395/6/7 G10 Maximum Capacitive Load vs Feedback Resistor 1000 OUTPUT SERIES RESISTANCE () 40 CAPACITIVE LOAD (pF) 100 SUPPLY CURRENT (mA) 10 RF = R G AV = +2 VS = 5V PEAKING 5dB 900 1500 2100 2700 FEEDBACK RESISTANCE () 3300 1 300 UW 1395/6/7 G07 1395/6/7 G13 Maximum Undistorted Output Voltage vs Frequency 80 70 AV = +1 6 5 4 3 2 1M 10M FREQUENCY (Hz) 100M 1395/6/7 G08 PSRR vs Frequency AV = +2 60 50 40 30 20 10 TA = 25C RF = RG = 255 RL = 100 AV = +2 100k 1M 10M FREQUENCY (Hz) 100M 1395/6/7 G09 - PSRR + PSRR TA = 25C RF = 374 (AV = 1) RF = RG = 255 (AV = 2) RL = 100 VS = 5V 0 10k Output Impedance vs Frequency 100k RF = RG = 255 RL = 50 AV = +2 VS = 5V LT1395CS6 Output Impedance (Disabled) vs Frequency RF = 374 AV = +1 VS = 5V 10k 1 1k 0.1 0.01 10k 100k 1M 10M FREQUENCY (Hz) 100M 1395/6/7 G11 100 100k 1M 10M FREQUENCY (Hz) 100M 1395/6/7 G12 Capacitive Load vs Output Series Resistor RF = RG = 255 VS = 5V OVERSHOOT < 2% 30 Supply Current vs Supply Voltage 6 5 4 3 2 1 EN = 0V, ALL NON-DISABLE DEVICES EN = V - 20 10 0 10 100 CAPACITIVE LOAD (pF) 1000 1395/6/7 G14 0 0 1 2 7 3 5 6 4 SUPPLY VOLTAGE ( V) 8 9 1395/6/7 G15 139567fc 7 LT1395/LT1396/LT1397 TYPICAL PERFOR A CE CHARACTERISTICS Output Voltage Swing vs Temperature 5 4 OUTPUT VOLTAGE SWING (V) POSITIVE SUPPLY CURRENT PER AMPLIFIER (mA) ENABLE PIN CURRENT (A) 3 2 1 0 -1 -2 -3 -4 RL = 100k RL = 150 VS = 5V RL = 100k RL = 150 -5 50 25 0 75 100 -50 -25 AMBIENT TEMPERATURE (C) Input Offset Voltage vs Temperature 3.0 2.5 VS = 5V INPUT BIAS CURRENT (A) INPUT OFFSET VOLTAGE (mV) 2.0 1.5 1.0 0.5 0 - 0.5 -1.0 - 50 - 25 50 75 100 25 AMBIENT TEMPERATURE (C) 0 125 Square Wave Response OUTPUT (200mV/DIV) INPUT (100mV/DIV) RL = 100 RF = RG = 255 f = 10MHz TIME (10ns/DIV) 1395/6/7 G21 VOUT (200mV/DIV) 8 UW 1395/6/7 G16 LT1395CS6 Enable Pin Current vs Temperature - 10 - 20 EN = 0V - 30 - 40 EN = -5V - 50 - 60 - 70 - 80 - 50 - 25 VS = 5V 5.00 4.75 4.50 4.25 4.00 3.75 3.50 3.25 Positive Supply Current per Amplifier vs Temperature VS = 5V EN = - 5V EN = 0V, ALL NON-DISABLE DEVICES 125 50 100 25 75 0 AMBIENT TEMPERATURE (C) 125 3.00 -50 -25 0 50 75 100 25 AMBIENT TEMPERATURE (C) 125 1395/6/7 G17 1395/6/7 G18 Input Bias Currents vs Temperature 15 VS = 5V 12 IB+ 9 IB- 6 3 0 -50 -25 50 100 25 75 0 AMBIENT TEMPERATURE (C) 125 1395/6/7 G19 1395/6/7 G20 Propagation Delay Rise Time and Overshoot OS = 10% OUTPUT (200mV/DIV) tPD = 2.5ns AV = +2 TIME (500ps/DIV) RL = 100 RF = RG = 255 1395/6/7 G22 tr = 1.3ns TIME (500ps/DIV) AV = +2 RL = 100 RF = RG = 255 1395/6/7 G23 139567fc LT1395/LT1396/LT1397 PIN FUNCTIONS LT1395CS5 OUT (Pin 1): Output. V - (Pin 2): Negative Supply Voltage, Usually -5V. +IN (Pin 3): Noninverting Input. -IN (Pin 4): Inverting Input. V + (Pin 5): Positive Supply Voltage, Usually 5V. LT1395CS6 OUT (Pin 1): Output. V - (Pin 2): Negative Supply Voltage, Usually -5V. +IN (Pin 3): Noninverting Input. -IN (Pin 4): Inverting Input. EN (Pin 5): Enable Pin. Logic low to enable. V + (Pin 6): Positive Supply Voltage, Usually 5V. LT1395CS8 NC (Pin 1): No Connection. - IN (Pin 2): Inverting Input. + IN (Pin 3): Noninverting Input. V - (Pin 4): Negative Supply Voltage, Usually - 5V. NC (Pin 5): No Connection. OUT (Pin 6): Output. V + (Pin 7): Positive Supply Voltage, Usually 5V. NC (Pin 8): No Connection. LT1396CMS8, LT1396CS8, LT1396CDD OUT A (Pin 1): A Channel Output. - IN A (Pin 2): Inverting Input of A Channel Amplifier. + IN A (Pin 3): Noninverting Input of A Channel Amplifier. V - (Pin 4): Negative Supply Voltage, Usually - 5V. + IN B (Pin 5): Noninverting Input of B Channel Amplifier. - IN B (Pin 6): Inverting Input of B Channel Amplifier. OUT B (Pin 7): B Channel Output. V + (Pin 8): Positive Supply Voltage, Usually 5V. LT1397CS, LT1397CDE, LT1397HDE OUT A (Pin 1): A Channel Output. - IN A (Pin 2): Inverting Input of A Channel Amplifier. + IN A (Pin 3): Noninverting Input of A Channel Amplifier. V + (Pin 4): Positive Supply Voltage, Usually 5V. + IN B (Pin 5): Noninverting Input of B Channel Amplifier. - IN B (Pin 6): Inverting Input of B Channel Amplifier. OUT B (Pin 7): B Channel Output. OUT C (Pin 8): C Channel Output. - IN C (Pin 9): Inverting Input of C Channel Amplifier. + IN C (Pin 10): Noninverting Input of C Channel Amplifier. V - (Pin 11): Negative Supply Voltage, Usually - 5V. + IN D (Pin 12): Noninverting Input of D Channel Amplifier. - IN D (Pin 13): Inverting Input of D Channel Amplifier. OUT D (Pin 14): D Channel Output. LT1397CGN OUT A (Pin 1): A Channel Output. - IN A (Pin 2): Inverting Input of A Channel Amplifier. + IN A (Pin 3): Noninverting Input of A Channel Amplifier. V + (Pin 4): Positive Supply Voltage, Usually 5V. + IN B (Pin 5): Noninverting Input of B Channel Amplifier. - IN B (Pin 6): Inverting Input of B Channel Amplifier. OUT B (Pin 7): B Channel Output. NC (Pin 8): No Connection. NC (Pin 9): No Connection. OUT C (Pin 10): C Channel Output. - IN C (Pin 11): Inverting Input of C Channel Amplifier. + IN C (Pin 12): Noninverting Input of C Channel Amplifier. V - (Pin 13): Negative Supply Voltage, Usually - 5V. + IN D (Pin 14): Noninverting Input of D Channel Amplifier. - IN D (Pin 15): Inverting Input of D Channel Amplifier. OUT D (Pin 16): D Channel Output. 139567fc U U U 9 LT1395/LT1396/LT1397 APPLICATI S I FOR ATIO Feedback Resistor Selection The small-signal bandwidth of the LT1395/LT1396/LT1397 is set by the external feedback resistors and the internal junction capacitors. As a result, the bandwidth is a function of the supply voltage, the value of the feedback resistor, the closed-loop gain and the load resistor. The LT1395/LT1396/LT1397 have been optimized for 5V supply operation and have a - 3dB bandwidth of 400MHz at a gain of 1 and 350MHz at a gain of 2. Please refer to the resistor selection guide in the Typical AC Performance table. Capacitance on the Inverting Input Current feedback amplifiers require resistive feedback from the output to the inverting input for stable operation. Take care to minimize the stray capacitance between the output and the inverting input. Capacitance on the inverting input to ground will cause peaking in the frequency response (and overshoot in the transient response). Capacitive Loads The LT1395/LT1396/LT1397 can drive many capacitive loads directly when the proper value of feedback resistor is used. The required value for the feedback resistor will increase as load capacitance increases and as closed-loop gain decreases. Alternatively, a small resistor (5 to 35) can be put in series with the output to isolate the capacitive load from the amplifier output. This has the advantage that the amplifier bandwidth is only reduced when the capacitive load is present. The disadvantage is that the gain is a function of the load resistance. See the Typical Performance Characteristics curves. Power Supplies The LT1395/LT1396/LT1397 will operate from single or split supplies from 2V (4V total) to 6V (12V total). It is not necessary to use equal value split supplies, however the offset voltage and inverting input bias current will change. The offset voltage changes about 2.5mV per volt of supply mismatch. The inverting bias current will typically change about 10A per volt of supply mismatch. +IS (mA) 10 U Slew Rate Unlike a traditional voltage feedback op amp, the slew rate of a current feedback amplifier is not independent of the amplifier gain configuration. In a current feedback amplifier, both the input stage and the output stage have slew rate limitations. In the inverting mode, and for gains of 2 or more in the noninverting mode, the signal amplitude between the input pins is small and the overall slew rate is that of the output stage. For gains less than 2 in the noninverting mode, the overall slew rate is limited by the input stage. The input slew rate of the LT1395/LT1396/LT1397 is approximately 600V/s and is set by internal currents and capacitances. The output slew rate is set by the value of the feedback resistor and internal capacitance. At a gain of 2 with 255 feedback and gain resistors and 5V supplies, the output slew rate is typically 800V/s. Larger feedback resistors will reduce the slew rate as will lower supply voltages. Enable/ Disable The LT1395CS6 has a unique high impedance, zero supply current mode which is controlled by the EN pin. The LT1395CS6 is designed to operate with CMOS logic; it draws virtually zero current when the EN pin is high. To activate the amplifier, its EN pin is normally pulled to a logic low. However, supply current will vary as the voltage between the V + supply and EN is varied. As seen in Figure 1, +IS does vary with (V + - VEN), particularly when the voltage difference is less than 3V. For normal operation, 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 1 2 4 3 V + - VEN (V) 5 6 7 V - = - 5V TA = 25C V + = 5V V - = 0V 1395/6/7 F01 W U UO Figure 1. + IS vs (V + - V EN) 139567fc LT1395/LT1396/LT1397 APPLICATI S I FOR ATIO U Differential Input Signal Swing OUTPUT VS = 5V VIN = 1V RF = 255 RG = 255 RL = 100 Figure 2. Amplifier Enable Time, AV = 2 VS = 5V VIN = 1V RF = 255 RG = 255 RL = 100 Figure 3. Amplifier Disable Time, AV = 2 B R13 76.8 A2 1/4 LT1397 ALL RESISTORS 1% VS = 5V A4 1/4 LT1397 1395/6/7 F04 Figure 4. Buffered RGB to Color-Difference Matrix 139567fc + + - The enable/disable times are very fast when driven from standard 5V CMOS logic. The LT1395CS6 enables in about 30ns (50% point to 50% point) while operating on 5V supplies (Figure 2). Likewise, the disable time is approximately 40ns (50% point to 50% point) (Figure 3). A3 1/4 LT1397 R4 255 - + - it is important to keep the EN pin at least 3V below the V + supply. If a V + of less than 3V is desired, and the amplifier will remain enabled at all times, then the EN pin should be tied to the V - supply. The enable pin current is approximately 30A when activated. If using CMOS open-drain logic, an external 1k pull-up resistor is recommended to ensure that the LT1395CS6 remains disabled in spite of any CMOS drain leakage currents. W U UO To avoid any breakdown condition on the input transistors, the differential input swing must be limited to 5V. In normal operation, the differential voltage between the input pins is small, so the 5V limit is not an issue. Buffered RGB to Color-Difference Matrix EN 1395/6/7 F02 OUTPUT EN 1395/6/7 F03 An LT1397 can be used to create buffered color-difference signals from RGB inputs (Figure 4). In this application, the R input arrives via 75 coax. It is routed to the noninverting input of LT1397 amplifier A1 and to a 845 resistor R8. There is also an 82.5 termination resistor R11, which yields a 75 input impedance at the R input when considered in parallel with R8. R8 connects to the inverting input of a second LT1397 amplifier (A2), which also sums the weighted G and B inputs to create a -0.5 * Y output. LT1397 amplifier A3 then takes the -0.5 * Y output and amplifies it by a gain of -2, resulting in the Y output. Amplifier A1 is configured in a noninverting gain of 2 with the bottom of the gain resistor R2 tied to the Y output. The output of amplifier A1 thus results in the color-difference output R-Y. The B input is similar to the R input. It arrives via 75 coax, and is routed to the noninverting input of LT1397 amplifier A4, and to a 2320 resistor R10. There is also a 76.8 termination resistor R13, which yields a 75 75 SOURCES R R11 82.5 G R12 90.9 R10 2320 R9 432 R7 255 + R8 845 A1 1/4 LT1397 R-Y R1 255 - R6 127 R5 255 R2 255 Y R3 255 B-Y 11 LT1395/LT1396/LT1397 APPLICATI S I FOR ATIO input impedance when considered in parallel with R10. R10 also connects to the inverting input of amplifier A2, adding the B contribution to the Y signal as discussed above. Amplifier A4 is configured in a noninverting gain of 2 configuration with the bottom of the gain resistor R4 tied to the Y output. The output of amplifier A4 thus results in the color-difference output B-Y. The G input also arrives via 75 coax and adds its contribution to the Y signal via a 432 resistor R9, which is tied to the inverting input of amplifier A2. There is also a 90.9 termination resistor R12, which yields a 75 termination when considered in parallel with R9. Using superposition, it is straightforward to determine the output of amplifier A2. Although inverted, it sums the R, G and B signals in the standard proportions of 0.3R, 0.59G and 0.11B that are used to create the Y signal. Amplifier A3 then inverts and amplifies the signal by 2, resulting in the Y output. Buffered Color-Difference to RGB Matrix An LT1395 combined with an LT1396 can be used to create buffered RGB outputs from color-difference signals (Figure 5). The R output is a back-terminated 75 signal created using resistor R5 and amplifier A1 configured for a gain of +4 via resistors R3 and R4. The noninverting input of amplifier A1 is connected via 1k resistors R1 and R2 to the Y and R-Y inputs respectively, resulting in cancellation of the Y signal at the amplifier input. The remaining R signal is then amplified by A1. The B output is also a back-terminated 75 signal created using resistor R16 and amplifier A3 configured for a gain of +4 via resistors R14 and R15. The noninverting input of amplifier A3 is connected via 1k resistors R12 and R13 to the Y and B-Y inputs respectively, resulting in cancellation of the Y signal at the amplifier input. The remaining B signal is then amplified by A3. The G output is the most complicated of the three. It is a weighted sum of the Y, R-Y and B-Y inputs. The Y input is attenuated via resistors R6 and R7 such that amplifier A2's noninverting input sees 0.83Y. Using superposition, we can calculate the positive gain of A2 by assuming that 12 U R8 and R9 are grounded. This results in a gain of 2.41 and a contribution at the output of A2 of 2Y. The R-Y input is amplified by A2 with the gain set by resistors R8 and R10, giving an amplification of -1.02. This results in a contribution at the output of A2 of 1.02Y - 1.02R. The B-Y input is amplified by A2 with the gain set by resistors R9 and R10, giving an amplification of - 0.37. This results in a contribution at the output of A2 of 0.37Y - 0.37B. If we now sum the three contributions at the output of A2, we get: A2OUT = 3.40Y - 1.02R - 0.37B It is important to remember though that Y is a weighted sum of R, G and B such that: Y = 0.3R + 0.59G + 0.11B If we substitute for Y at the output of A2 we then get: A2OUT = (1.02R - 1.02R) + 2G + (0.37B - 0.37B) = 2G The back-termination resistor R11 then halves the output of A2 resulting in the G output. R1 1k Y R2 1k R-Y W U UO + A1 1/2 LT1396 R5 75 R R3 267 - R6 205 R7 1k R8 261 R9 698 B-Y R12 1k R13 1k ALL RESISTORS 1% VS = 5V R4 88.7 + A2 LT1395 R11 75 G R10 267 - + A3 1/2 LT1396 R16 75 B R14 267 - R15 88.7 1395/6/7 F05 Figure 5. Buffered Color-Difference to RGB Matrix 139567fc LT1395/LT1396/LT1397 SI PLIFIED SCHE ATIC (each amplifier) V+ EN (LT1395CS6 ONLY) FOR ALL NON-DISABLE DEVICES V- 1395/6/7 SS PACKAGE DESCRIPTIO 0.675 0.05 3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PIN 1 PACKAGE TOP MARK (NOTE 6) OUTLINE 0.25 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS U W W +IN -IN OUT DD Package 8-Lead Plastic DFN (3mm x 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5 0.38 0.10 8 3.00 0.10 (4 SIDES) 1.65 0.10 (2 SIDES) (DD) DFN 1203 0.200 REF 0.75 0.05 4 0.25 0.05 2.38 0.10 (2 SIDES) 1 0.50 BSC 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE 139567fc 13 LT1395/LT1396/LT1397 PACKAGE DESCRIPTIO U DE Package 14-Lead Plastic DFN (4mm x 3mm) (Reference LTC DWG # 05-08-1708 Rev B) 4.00 0.10 (2 SIDES) 0.70 0.05 3.60 0.05 1.70 0.05 2.20 (2 SIDES) 0.05 R = 0.05 TYP 1.70 0.05 (2 SIDES) R = 0.115 TYP 8 14 0.40 0.10 PACKAGE OUTLINE PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF 3.00 0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.35 x 45 CHAMFER (DE14) DFN 0905 REV A 7 0.75 0.05 3.30 0.05 (2 SIDES) 0.25 0.05 0.50 BSC 3.30 0.05 (2 SIDES) 1 0.25 0.05 0.50 BSC 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WGED-3) IN JEDEC PACKAGE OUTLINE MO-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) .045 .005 .189 - .196* (4.801 - 4.978) 16 15 14 13 12 11 10 9 .009 (0.229) REF .254 MIN .150 - .165 .229 - .244 (5.817 - 6.198) .0165 .0015 .150 - .157** (3.810 - 3.988) .0250 BSC RECOMMENDED SOLDER PAD LAYOUT 1 .015 .004 x 45 (0.38 0.10) .007 - .0098 (0.178 - 0.249) .016 - .050 (0.406 - 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE .0532 - .0688 (1.35 - 1.75) 23 4 56 7 8 .004 - .0098 (0.102 - 0.249) 0 - 8 TYP .008 - .012 (0.203 - 0.305) TYP .0250 (0.635) BSC GN16 (SSOP) 0204 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 139567fc 14 LT1395/LT1396/LT1397 PACKAGE DESCRIPTIO U MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 0.127 (.035 .005) 3.20 - 3.45 (.126 - .136) 0.65 (.0256) BSC 3.00 0.102 (.118 .004) (NOTE 3) 8 7 65 0.52 (.0205) REF DETAIL "A" 0 - 6 TYP 4.90 0.152 (.193 .006) 5.23 (.206) MIN 0.42 0.038 (.0165 .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 3.00 0.102 (.118 .004) (NOTE 4) 0.254 (.010) GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL "A" 0.18 (.007) SEATING PLANE 1 23 4 1.10 (.043) MAX 0.86 (.034) REF 0.22 - 0.38 (.009 - .015) TYP NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 0.65 (.0256) BSC 0.127 0.076 (.005 .003) MSOP (MS8) 0204 139567fc 15 LT1395/LT1396/LT1397 PACKAGE DESCRIPTIO U S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1633) 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 - 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10 1.90 BSC S5 TSOT-23 0302 REV B 0.62 MAX 0.95 REF 3.85 MAX 2.62 REF 0.30 - 0.50 REF 0.09 - 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 139567fc 16 LT1395/LT1396/LT1397 PACKAGE DESCRIPTIO U S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1634) 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE ID 0.95 BSC 0.30 - 0.45 6 PLCS (NOTE 3) 0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10 0.09 - 0.20 (NOTE 3) 1.90 BSC S6 TSOT-23 0302 REV B 0.62 MAX 0.95 REF 3.85 MAX 2.62 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 - 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 139567fc 17 LT1395/LT1396/LT1397 PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .050 BSC 8 .245 MIN .030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP .016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 18 U .045 .005 .189 - .197 (4.801 - 5.004) NOTE 3 7 6 5 .160 .005 .228 - .244 (5.791 - 6.197) .150 - .157 (3.810 - 3.988) NOTE 3 1 2 3 4 .053 - .069 (1.346 - 1.752) .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC SO8 0303 139567fc LT1395/LT1396/LT1397 PACKAGE DESCRIPTIO S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .050 BSC N 14 13 .245 MIN 1 .030 .005 TYP 2 3 RECOMMENDED SOLDER PAD LAYOUT 1 .010 - .020 x 45 (0.254 - 0.508) 2 3 4 5 6 7 .008 - .010 (0.203 - 0.254) .016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 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 .045 .005 .337 - .344 (8.560 - 8.738) NOTE 3 12 11 10 9 8 N .160 .005 .228 - .244 (5.791 - 6.197) N/2 N/2 .150 - .157 (3.810 - 3.988) NOTE 3 .053 - .069 (1.346 - 1.752) 0 - 8 TYP .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC S14 0502 139567fc 19 LT1395/LT1396/LT1397 TYPICAL APPLICATI Single Supply RGB Video Amplifier The LT1395 can be used with a single supply voltage of 6V or more to drive ground-referenced RGB video. In Figure 6, two 1N4148 diodes D1 and D2 have been placed in series with the output of the LT1395 amplifier A1 but within the feedback loop formed by resistor R8. These diodes effectively level-shift A1's output downward by 2 diodes, allowing the circuit output to swing to ground. Amplifier A1 is used in a positive gain configuration. The feedback resistor R8 is 255. The gain resistor is created from the parallel combination of R6 and R7, giving a Thevenin equivalent 63.5 connected to 3.75V. This gives an AC gain of + 5 from the noninverting input of amplifier A1 to the cathode of D2. However, the video input is also attenuated before arriving at A1's positive VIN RELATED PARTS PART NUMBER LT1227/LT1229/LT1230 LT1252/LT1253/LT1254 LT1363/LT1364/LT1365 LT1398/LT1399 LT1675 LT6559 DESCRIPTION 140MHz Single/Dual/Quad Current Feedback Amplifier Low Cost Video Amplifiers 70MHz Single/Dual/Quad Op Amps Dual/Triple Current Feedback Amplifiers Triple 2:1 Buffered Video Multiplexer Low Cost Triple Current Feedback Amplifiers COMMENTS 1100V/s Slew Rate, Single Adds Shutdown Pin Single, Dual and Quad 100MHz Current Feedback Amplifiers 1000V/s Slew Rate, Voltage Feedback 300MHz Bandwidth, 0.1dB Flatness > 150MHz with Shutdown 2.5ns Switching Time, 250MHz Bandwidth 300MHz Bandwidth, Specified at +5V and 5V, 3mm x 3mm QFN Package 20 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 UO input. Assuming a 75 source impedance for the signal driving VIN, the Thevenin equivalent signal arriving at A1's positive input is 3V + 0.4VIN, with a source impedance of 714. The combination of these two inputs gives an output at the cathode of D2 of 2 * VIN with no additional DC offset. The 75 back termination resistor R9 halves the signal again such that VOUT equals a buffered version of VIN. It is important to note that the 4.7F capacitor C1 has been added to provide enough current to maintain the voltage drop across diodes D1 and D2 when the circuit output drops low enough that the diodes might otherwise turn off. This means that this circuit works fine for continuous video input, but will require that C1 charge up after a period of inactivity at the input. 5V VS 6V TO 12V C1 4.7F D2 D1 1N4148 1N4148 R1 1000 R2 1300 R3 160 R4 75 R5 2.32 R6 84.5 + A1 LT1395 R9 75 VOUT - R8 255 1395/6/7 TA03 R7 255 Figure 6. Single Supply RGB Video Amplifier (1 of 4 Channels) 139567fc LT 0207 REV C * PRINTED IN USA www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 1999 |
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