LT1395/LT1396/LT1397 Single/Dual/Quad 400MHz Current Feedback Amplifier U 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/µs 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 × 3mm × 0.75mm DFN-8 Packages LT1397: SO-14, SSOP-16 and Tiny 4mm × 3mm × 0.75mm DFN-14 Packages ■ ■ ■ ■ 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 × 3mm × 0.75mm dual fine pitch leadless DFN package, and the LT1397 is available in a tiny 4mm × 3mm × 0.75mm DFN package. U APPLICATIO S ■ The LT ®1395/LT1396/LT1397 are single/dual/quad 400MHz current feedback amplifiers with an 800V/µs slew rate and the ability to drive up to 80mA of output current. Cable Drivers Video Amplifiers MUX Amplifiers High Speed Portable Equipment IF Amplifiers 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. U TYPICAL APPLICATIO Unity-Gain Video Loop-Through Amplifier R G1 1.02k R G2 63.4Ω R F1 255Ω Loop-Through Amplifier Frequency Response R F2 255Ω 10 0 NORMAL SIGNAL 3.01k VIN – 0.67pF HIGH INPUT RESISTANCE DOES NOT LOAD CABLE EVEN WHEN POWER IS OFF – 1/2 LT1396 3.01k VIN+ + 12.1k 0.67pF BNC INPUTS 1/2 LT1396 + 12.1k VOUT 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 GAIN (dB) – –10 –20 –30 –40 COMMON MODE SIGNAL –50 –60 100 1k 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) 1395/6/7 TA02 139567fc 1 LT1395/LT1396/LT1397 W W W AXI U Total Supply Voltage (V + to U ABSOLUTE RATI GS (Note 1) V –) ........................... 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 ............. – 40°C to 85°C LT1397H ......................................... – 40°C to 125°C Specified Temperature Range (Note 5) LT1395C/LT1396C/LT1397C .................. 0°C to 70°C LT1397H ......................................... – 40°C to 125°C Storage Temperature Range ................. – 65°C to 150°C Storage Temperature Range (DD Package) ................................... – 65°C to 125°C Junction Temperature (Note 6) ............................ 150°C Junction Temperature (DD Package) (Note 6) ..... 125°C Lead Temperature (Soldering, 10 sec)................. 300°C U U U PI CO FIGURATIO TOP VIEW TOP VIEW TOP VIEW OUT A 1 8 V+ –IN A 2 7 OUT B +IN A 3 V – –IN B 6 4 +IN B 5 OUT A 1 14 OUT D –IN A 2 13 –IN D +IN A 3 12 +IN D V+ 4 11 V – OUT A 1 –IN A 2 +IN A 3 V+ 4 +IN B 5 16 OUT D – 15 –IN D + 14 +IN D – + 13 V – + 12 +IN C – 11 –IN C + – +IN B 5 10 +IN C –IN B 6 –IN B 6 9 –IN C OUT B 7 10 OUT C OUT B 7 8 OUT C NC 8 9 NC DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN DE14 PACKAGE 14-LEAD (4mm × 3mm) PLASTIC DFN GN PACKAGE 16-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 160°C/W (NOTE 3) UNDERSIDE METAL CONNECTED TO V– (PCB CONNECTION OPTIONAL) TJMAX = 125°C, θJA = 43°C/W, θJC = 4.3°C/W EXPOSED PAD (PIN 15) IS V– MUST BE SOLDERED TO PCB TJMAX = 150°C, θJA = 135°C/W TOP VIEW 14 OUT D OUT A 1 –IN A 2 +IN A 3 V+ 4 TOP VIEW OUT A –IN A +IN A V– 1 2 3 4 – + – + – + 8 7 6 5 V+ OUT B –IN B +IN B +IN B 5 –IN B 6 OUT B 7 – 13 –IN D + 12 +IN D TOP VIEW 11 V – + – + 10 +IN C – 9 –IN C 8 OUT C 5 V+ OUT 1 V– 2 +IN 3 + – 4 –IN MS8 PACKAGE 8-LEAD PLASTIC MSOP S PACKAGE 14-LEAD PLASTIC SO S5 PACKAGE 5-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 250°C/W TJMAX = 150°C, θJA = 100°C/W TJMAX = 150°C, θJA = 250°C/W 139567fc 2 LT1395/LT1396/LT1397 U U U PI CO FIGURATIO TOP VIEW NC 1 TOP VIEW OUT 1 V– 2 +IN 3 + – 6 V+ –IN 2 5 EN +IN 3 4 –IN V– 4 – + TOP VIEW 8 NC OUT A 1 7 V+ –IN A 2 6 OUT +IN A 3 5 NC V– 4 – + – + 8 V+ 7 OUT B 6 –IN B 5 +IN B S6 PACKAGE 6-LEAD PLASTIC TSOT-23 S8 PACKAGE (1395) 8-LEAD PLASTIC SO S8 PACKAGE (1396) 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 230°C/W TJMAX = 150°C, θJA = 150°C/W TJMAX = 150°C, θJA = 150°C/W U W U ORDER I FOR ATIO LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1396CDD#PBF LT1397CDE#PBF LT1397HDE#PBF LT1397CGN#PBF LT1396CMS8#PBF LT1397CS#PBF LT1395CS5#PBF LT1395CS6#PBF LT1395CS8#PBF LT1396CS8#PBF LT1396CDD#TRPBF LT1397CDE#TRPBF LT1397HDE#TRPBF LT1397CGN#TRPBF LT1396CMS8#TRPBF LT1397CS#TRPBF LT1395CS5#TRPBF LT1395CS6#TRPBF LT1395CS8#TRPBF LT1396CS8#TRPBF LABD 1397 1397 1397 LTDY 1397CS LTMA LTMF 1395 1396 8-Lead (3mm × 3mm) Plastic DFN 14-Lead (4mm × 3mm) Plastic DFN 14-Lead (4mm × 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 –40°C to 85°C –40°C to 85°C –40°C to 125°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1396CDD LT1397CDE LT1397HDE LT1397CGN LT1396CMS8 LT1397CS LT1395CS5 LT1395CS6 LT1395CS8 LT1396CS8 LT1396CDD#TR LT1397CDE#TR LT1397HDE#TR LT1397CGN#TR LT1396CMS8#TR LT1397CS#TR LT1395CS5#TR LT1395CS6#TR LT1395CS8#TR LT1396CS8#TR LABD 1397 1397 1397 LTDY 1397CS LTMA LTMF 1395 1396 8-Lead (3mm × 3mm) Plastic DFN 14-Lead (4mm × 3mm) Plastic DFN 14-Lead (4mm × 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 –40°C to 85°C –40°C to 85°C –40°C to 125°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C 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/ 139567fc 3 LT1395/LT1396/LT1397 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C. For each amplifier: VCM = 0V, VS = ±5V, EN = 0.5V, pulse tested, unless otherwise noted. (Note 5) SYMBOL PARAMETER VOS Input Offset Voltage ∆VOS/∆T Input Offset Voltage Drift IIN+ Noninverting Input Current IIN– Inverting Input Current en Input Noise Voltage Density f = 1kHz, RF = 1k, RG = 10Ω, RS = 0Ω 4.5 nV/√Hz + in Noninverting Input Noise Current Density f = 1kHz 6 pA/√Hz – in Inverting Input Noise Current Density f = 1kHz 25 pA/√Hz RIN Input Resistance VIN = ±3.5V CIN Input Capacitance VINH Input Voltage Range, High VS = ±5V VS = 5V, 0V ● VINL Input Voltage Range, Low VS = ±5V VS = 5V, 0V ● VOUTH Output Voltage Swing, High VS = ±5V VS = ±5V VS = 5V, 0V ● VS = ±5V VS = ±5V VS = 5V, 0V ● VS = ±5V, RL = 150Ω VS = ±5V, RL = 150Ω VS = 5V, 0V; RL = 150Ω ● VS = ±5V, RL = 150Ω VS = ±5V, RL = 150Ω VS = 5V, 0V; RL = 150Ω ● ● VOUTL VOUTH VOUTL CONDITIONS MIN TYP MAX UNITS 1 ±10 ±12 mV mV ● ● 10 ±25 ±30 µA µA 10 ±50 ±60 µA µA ● ● Output Voltage Swing, Low Output Voltage Swing, High Output Voltage Swing, Low ● µV/°C 15 0.3 3.5 1 MΩ 2.0 pF 4.0 4.0 V V – 4.0 1.0 3.9 3.7 – 3.5 4.2 V V V 4.2 – 4.2 – 3.9 – 3.7 0.8 3.4 3.2 3.6 – 3.4 – 3.2 0.6 CMRR Common Mode Rejection Ratio VCM = ±3.5V – ICMRR Inverting Input Current Common Mode Rejection VCM = ±3.5V VCM = ±3.5V ● ● 42 V V V V V V 3.6 – 3.6 V V 52 V V V dB 16 22 µA/V µA/V 1 2 3 µA/V µA/V 2 7 µA/V 10 PSRR Power Supply Rejection Ratio VS = ±2V to ±5V + IPSRR Noninverting Input Current Power Supply Rejection VS = ±2V to ±5V – IPSRR Inverting Input Current Power Supply Rejection VS = ±2V to ±5V AV Large-Signal Voltage Gain VOUT = ±2V, RL = 150Ω 50 65 dB ROL Transimpedance, ∆VOUT/∆IIN– VOUT = ±2V, RL = 150Ω 40 100 kΩ IOUT Maximum Output Current RL = 0Ω ● IS Supply Current per Amplifier VOUT = 0V ● 4.6 6.5 mA Disable Supply Current EN Pin Voltage = 4.5V, RL = 150Ω (LT1395CS6 only) ● 0.1 100 µA IEN Enable Pin Current (LT1395CS6 only) 30 110 200 µA µA SR Slew Rate (Note 7) 56 70 ● ● 80 mA ● AV = – 1, RL = 150Ω dB 500 800 V/µs 139567fc 4 LT1395/LT1396/LT1397 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C. For each amplifier: VCM = 0V, VS = ±5V, pulse tested, unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS TYP MAX tON Turn-On Delay Time (Note 9) RF = RG = 255Ω, RL = 100Ω, (LT1395CS6 only) 30 75 ns tOFF Turn-Off Delay Time (Note 9) RF = RG = 255Ω, RL = 100Ω, (LT1395CS6 only) 40 100 ns – 3dB BW –3dB Bandwidth AV = 1, RF = 374Ω, RL = 100Ω AV = 2, RF = RG = 255Ω, RL = 100Ω 400 350 MHz MHz 0.1dB BW 0.1dB Bandwidth AV = 1, RF = 374Ω, RL = 100Ω AV = 2, RF = RG = 255Ω, RL = 100Ω 100 100 MHz MHz tr, tf Small-Signal Rise and Fall Time RF = RG = 255Ω, RL = 100Ω, VOUT = 1VP-P 1.3 ns tPD Propagation Delay RF = RG = 255Ω, RL = 100Ω, VOUT = 1VP-P 2.5 ns os Small-Signal Overshoot RF = RG = 255Ω, RL = 100Ω, VOUT = 1VP-P 10 % tS Settling Time 0.1%, AV = – 1, RF = RG = 280Ω, RL = 150Ω 25 ns dG Differential Gain (Note 8) RF = RG = 255Ω, RL = 150Ω 0.02 % dP Differential Phase (Note 8) RF = RG = 255Ω, RL = 150Ω 0.04 DEG 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 θJA 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 – 40°C to 85°C. The LT1397H is guaranteed functional over the operating temperature range of –40°C to 125°C. Note 5: The LT1395C/LT1396C/LT1397C are guaranteed to meet specified performance from 0°C to 70°C. The LT1395C/LT1396C/LT1397C are designed, characterized and expected to meet specified performance from – 40°C and 85°C but are not tested or QA sampled at these temperatures. The LT1397H is guaranteed to meet specified performance from –40°C to 125°C. For guaranteed I-grade parts, consult the factory. MIN UNITS Note 6: TJ is calculated from the ambient temperature TA and the power dissipation PD according to the following formula: LT1395CS5: TJ = TA + (PD • 250°C/W) LT1396CS6: TJ = TA + (PD • 230°C/W) LT1395CS8: TJ = TA + (PD • 150°C/W) LT1396CS8: TJ = TA + (PD • 150°C/W) LT1396CMS8: TJ = TA + (PD • 250°C/W) LT1396CDD: TJ = TA + (PD • 160°C/W) LT1397CS14: TJ = TA + (PD • 100°C/W) LT1397CGN16: TJ = TA + (PD • 135°C/W) LT1397CDE: TJ = TA + (PD • 43°C/W) LT1397HDE: TJ = TA + (PD • 43°C/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 W U TYPICAL AC PERFOR A CE RG (Ω) SMALL SIGNAL – 3dB BW (MHz) SMALL SIGNAL 0.1dB BW (MHz) SMALL SIGNAL PEAKING (dB) VS (V) AV RL (Ω) RF (Ω) ±5 1 100 374 – 400 100 0.1 ±5 2 100 255 255 350 100 0.1 ±5 –1 100 280 280 350 100 0.1 ±5 3 500 221 110 300 100 0.1 ±5 5 500 100 24.9 210 50 0.0 ±5 10 500 90.9 10 65 10 0.0 ±5 10 500 90.9 10Ω||100pF 100 50 0.1 U W TYPICAL PERFOR A CE CHARACTERISTICS Closed-Loop Gain vs Frequency (AV = 2) Closed-Loop Gain vs Frequency (AV = – 1) 6 0 –2 4 –2 –4 –6 GAIN (dB) 0 GAIN (dB) 2 –6 0 1M 10M 100M VS = ±5V FREQUENCY (Hz) VIN = –10dBm RF = 374Ω RL = 100Ω 1G 1M 10M 100M VS = ±5V FREQUENCY (Hz) VIN = –10dBm RF = RG = 255Ω RL = 100Ω 1395/6/7 G01 1G OUTPUT (1V/DIV) OUTPUT (1V/DIV) TIME (10ns/DIV) 1395/6/7 G04 1M 10M 100M VS = ±5V FREQUENCY (Hz) VIN = –10dBm RF = RG = 280Ω RL = 100Ω 1395/6/7 G02 Large-Signal Transient Response (AV = 2) Large-Signal Transient Response (AV = 1) VS = ±5V VIN = ±2.5V RF = 374Ω RL = 100Ω –4 1G 1395/6/7 G03 Large-Signal Transient Response (AV = – 1) OUTPUT (1V/DIV) GAIN (dB) Closed-Loop Gain vs Frequency (AV = 1) VS = ±5V TIME (10ns/DIV) VIN = ±1.25V RF = RG = 255Ω RL = 100Ω 1395/6/7 G05 VS = ±5V TIME (10ns/DIV) VIN = ±2.5V RF = RG = 280Ω RL = 100Ω 1395/6/7 G06 139567fc 6 LT1395/LT1396/LT1397 U W TYPICAL PERFOR A CE CHARACTERISTICS Maximum Undistorted Output Voltage vs Frequency 2nd and 3rd Harmonic Distortion vs Frequency 80 70 7 70 HD2 HD3 80 90 AV = +1 110 10k 100k 1M FREQUENCY (Hz) 10M 5 4 TA = 25°C RF = 374Ω (AV = 1) RF = RG = 255Ω (AV = 2) RL = 100Ω VS = ± 5V 1M 10M FREQUENCY (Hz) en 1 30 10 1 0.1 0.01 10k 100 300 1k 3k 10k 30k 100k FREQUENCY (Hz) 100k 1M 10M FREQUENCY (Hz) 1k 100 100k 100M 10 RF = R G AV = +2 VS = ± 5V PEAKING ≤ 5dB 900 1500 2100 2700 FEEDBACK RESISTANCE (Ω) 3300 1395/6/7 G13 100M Supply Current vs Supply Voltage 6 RF = RG = 255Ω VS = ± 5V OVERSHOOT < 2% 30 5 SUPPLY CURRENT (mA) 100 1M 10M FREQUENCY (Hz) 1395/6/7 G12 40 OUTPUT SERIES RESISTANCE (Ω) CAPACITIVE LOAD (pF) 10k Capacitive Load vs Output Series Resistor 1000 1 300 RF = 374Ω AV = +1 VS = ± 5V 1395/6/7 G11 1395/6/7 G10 Maximum Capacitive Load vs Feedback Resistor 100M 100k RF = RG = 255Ω RL = 50Ω AV = +2 VS = ± 5V OUTPUT IMPEDANCE (DISABLED) (Ω) +in 1M 10M FREQUENCY (Hz) LT1395CS6 Output Impedance (Disabled) vs Frequency 100 OUTPUT IMPEDANCE (Ω) INPUT NOISE (nV/√Hz OR pA/√Hz) 1000 –in 100k 1395/6/7 G09 Output Impedance vs Frequency 100 TA = 25°C RF = RG = 255Ω RL = 100Ω AV = +2 1395/6/7 G08 Input Voltage Noise and Current Noise vs Frequency 10 30 0 10k 100M + PSRR 40 10 2 100M – PSRR 50 20 1395/6/7 G07 10 60 6 3 100 AV = +2 PSRR (dB) 60 1k PSRR vs Frequency 8 TA = 25°C 40 RF = RG = 255Ω RL = 100Ω 50 VS = ± 5V VOUT = 2VPP OUTPUT VOLTAGE (VP-P) DISTORTION (dB) 30 20 10 EN = V – 4 EN = 0V, ALL NON-DISABLE DEVICES 3 2 1 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 U W TYPICAL PERFOR A CE CHARACTERISTICS – 10 RL = 100k RL = 150Ω 2 1 VS = ± 5V 0 –1 –2 –3 RL = 100k VS = ± 5V – 20 ENABLE PIN CURRENT (µA) OUTPUT VOLTAGE SWING (V) 4 RL = 150Ω EN = 0V – 30 – 40 EN = –5V – 50 – 60 – 70 –4 –5 50 25 0 75 100 –50 –25 AMBIENT TEMPERATURE (°C) – 80 – 50 – 25 125 50 100 25 75 0 AMBIENT TEMPERATURE (°C) 1395/6/7 G16 125 5.00 VS = ± 5V EN = – 5V 4.75 4.50 EN = 0V, ALL NON-DISABLE DEVICES 4.25 4.00 3.75 3.50 3.25 3.00 –50 –25 0 50 75 100 25 AMBIENT TEMPERATURE (°C) 125 1395/6/7 G18 1395/6/7 G17 Input Offset Voltage vs Temperature 3.0 POSITIVE SUPPLY CURRENT PER AMPLIFIER (mA) 5 3 Positive Supply Current per Amplifier vs Temperature LT1395CS6 Enable Pin Current vs Temperature Output Voltage Swing vs Temperature Input Bias Currents vs Temperature 15 VS = ± 5V VS = ± 5V INPUT BIAS CURRENT (µA) INPUT OFFSET VOLTAGE (mV) 2.5 2.0 1.5 1.0 0.5 0 12 IB+ IB– 9 6 3 – 0.5 –1.0 – 50 – 25 0 50 75 100 25 AMBIENT TEMPERATURE (°C) 125 0 –50 –25 50 100 25 75 0 AMBIENT TEMPERATURE (°C) 1395/6/7 G20 1395/6/7 G19 Propagation Delay Rise Time and Overshoot OUTPUT (200mV/DIV) TIME (10ns/DIV) OUTPUT (200mV/DIV) RL = 100Ω RF = RG = 255Ω f = 10MHz 1395/6/7 G21 tPD = 2.5ns AV = +2 TIME (500ps/DIV) RL = 100Ω RF = RG = 255Ω 1395/6/7 G22 VOUT (200mV/DIV) OS = 10% INPUT (100mV/DIV) Square Wave Response 125 tr = 1.3ns 1395/6/7 G23 TIME (500ps/DIV) AV = +2 RL = 100Ω RF = RG = 255Ω 139567fc 8 LT1395/LT1396/LT1397 U U U PIN FUNCTIONS LT1395CS5 LT1397CS, LT1397CDE, LT1397HDE OUT (Pin 1): Output. OUT A (Pin 1): A Channel Output. V – (Pin 2): Negative Supply Voltage, Usually –5V. – IN A (Pin 2): Inverting Input of A Channel Amplifier. +IN (Pin 3): Noninverting Input. + IN A (Pin 3): Noninverting Input of A Channel Amplifier. –IN (Pin 4): Inverting Input. V + (Pin 4): Positive Supply Voltage, Usually 5V. V + (Pin 5): Positive Supply Voltage, Usually 5V. + IN B (Pin 5): Noninverting Input of B Channel Amplifier. 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. – 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. LT1395CS8 OUT D (Pin 14): D Channel Output. NC (Pin 1): No Connection. LT1397CGN – IN (Pin 2): Inverting Input. OUT A (Pin 1): A Channel Output. + IN (Pin 3): Noninverting Input. – IN A (Pin 2): Inverting Input of A Channel Amplifier. V – (Pin 4): + IN A (Pin 3): Noninverting Input of A Channel Amplifier. Negative Supply Voltage, Usually – 5V. NC (Pin 5): No Connection. V + (Pin 4): Positive Supply Voltage, Usually 5V. OUT (Pin 6): Output. + IN B (Pin 5): Noninverting Input of B Channel Amplifier. V + (Pin 7): Positive Supply Voltage, Usually 5V. – IN B (Pin 6): Inverting Input of B Channel Amplifier. NC (Pin 8): No Connection. OUT B (Pin 7): B Channel Output. LT1396CMS8, LT1396CS8, LT1396CDD NC (Pin 8): No Connection. OUT A (Pin 1): A Channel Output. NC (Pin 9): No Connection. – IN A (Pin 2): Inverting Input of A Channel Amplifier. OUT C (Pin 10): C Channel Output. + IN A (Pin 3): Noninverting Input of A Channel Amplifier. – IN C (Pin 11): Inverting Input of C Channel Amplifier. V – (Pin 4): Negative Supply Voltage, Usually – 5V. + IN C (Pin 12): Noninverting Input of C Channel Amplifier. + IN B (Pin 5): Noninverting Input of B Channel Amplifier. V – (Pin 13): Negative Supply Voltage, Usually – 5V. – IN B (Pin 6): Inverting Input of B Channel Amplifier. + IN D (Pin 14): Noninverting Input of D Channel Amplifier. OUT B (Pin 7): B Channel Output. – IN D (Pin 15): Inverting Input of D Channel Amplifier. V + (Pin 8): Positive Supply Voltage, Usually 5V. OUT D (Pin 16): D Channel Output. 139567fc 9 LT1395/LT1396/LT1397 U W U UO APPLICATI S I FOR ATIO Feedback Resistor Selection Slew Rate 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. 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. 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). The input slew rate of the LT1395/LT1396/LT1397 is approximately 600V/µs 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 255Ω feedback and gain resistors and ±5V supplies, the output slew rate is typically 800V/µs. Larger feedback resistors will reduce the slew rate as will lower supply voltages. Enable/ Disable 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 (5Ω to 35Ω) 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. 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 TA = 25°C V + = 5V 4.5 4.0 Power Supplies +IS (mA) 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 10µA per volt of supply mismatch. V – = 0V 3.5 3.0 V – = – 5V 2.5 2.0 1.5 1.0 0.5 0 0 1 2 4 3 V + – VEN (V) 5 6 7 1395/6/7 F01 Figure 1. + IS vs (V + – V EN) 139567fc 10 LT1395/LT1396/LT1397 W U U UO APPLICATI S I FOR ATIO Differential Input Signal Swing OUTPUT 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 VS = ±5V VIN = 1V RF = 255Ω RG = 255Ω RL = 100Ω 1395/6/7 F02 Figure 2. Amplifier Enable Time, AV = 2 OUTPUT EN VS = ±5V VIN = 1V RF = 255Ω RG = 255Ω RL = 100Ω 1395/6/7 F03 Figure 3. Amplifier Disable Time, AV = 2 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 30µA 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. 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). An LT1397 can be used to create buffered color-difference signals from RGB inputs (Figure 4). In this application, the R input arrives via 75Ω coax. It is routed to the noninverting input of LT1397 amplifier A1 and to a 845Ω resistor R8. There is also an 82.5Ω termination resistor R11, which yields a 75Ω 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 75Ω coax, and is routed to the noninverting input of LT1397 amplifier A4, and to a 2320Ω resistor R10. There is also a 76.8Ω termination resistor R13, which yields a 75Ω + 75Ω SOURCES R8 845Ω A1 1/4 LT1397 R R11 82.5Ω R1 255Ω R9 432Ω R7 255Ω G R12 90.9Ω R-Y – R10 2320Ω B R13 76.8Ω – A2 1/4 LT1397 + R6 127Ω R5 255Ω R2 255Ω – A3 1/4 LT1397 Y + R4 255Ω R3 255Ω – ALL RESISTORS 1% VS = ±5V A4 1/4 LT1397 + B-Y 1395/6/7 F04 Figure 4. Buffered RGB to Color-Difference Matrix 139567fc 11 LT1395/LT1396/LT1397 U W U UO 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 75Ω coax and adds its contribution to the Y signal via a 432Ω resistor R9, which is tied to the inverting input of amplifier A2. There is also a 90.9Ω termination resistor R12, which yields a 75Ω 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 75Ω 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 75Ω 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 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 + A1 1/2 LT1396 R-Y – R R3 267Ω R4 88.7Ω R6 205Ω + A2 LT1395 R7 1k R8 261Ω R5 75Ω – R11 75Ω G R10 267Ω R9 698Ω B-Y R12 1k R13 1k ALL RESISTORS 1% VS = ± 5V + A3 1/2 LT1396 – R16 75Ω B R14 267Ω R15 88.7Ω 1395/6/7 F05 Figure 5. Buffered Color-Difference to RGB Matrix 139567fc 12 LT1395/LT1396/LT1397 W W SI PLIFIED SCHE ATIC (each amplifier) V+ –IN +IN OUT EN (LT1395CS6 ONLY) FOR ALL NON-DISABLE DEVICES V– 1395/6/7 SS U PACKAGE DESCRIPTIO DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5 0.38 ± 0.10 8 0.675 ±0.05 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 3.00 ±0.10 (4 SIDES) 1.65 ± 0.10 (2 SIDES) PIN 1 PACKAGE TOP MARK (NOTE 6) OUTLINE (DD) DFN 1203 0.25 ± 0.05 0.200 REF 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.75 ±0.05 0.00 – 0.05 4 0.25 ± 0.05 1 0.50 BSC 2.38 ±0.10 (2 SIDES) 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 U PACKAGE DESCRIPTIO DE Package 14-Lead Plastic DFN (4mm × 3mm) (Reference LTC DWG # 05-08-1708 Rev B) R = 0.115 TYP 4.00 ±0.10 (2 SIDES) R = 0.05 TYP 0.70 ±0.05 3.60 ±0.05 1.70 ±0.05 2.20 (2 SIDES) ±0.05 PACKAGE OUTLINE 3.00 ±0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) 0.25 ± 0.05 0.50 BSC 8 0.40 ± 0.10 14 1.70 ± 0.05 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.35 × 45° CHAMFER (DE14) DFN 0905 REV A 7 1 0.25 ± 0.05 0.50 BSC 0.75 ±0.05 0.200 REF 3.30 ±0.05 (2 SIDES) 3.30 ±0.05 (2 SIDES) 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) .189 – .196* (4.801 – 4.978) .045 ±.005 16 15 14 13 12 11 10 9 .254 MIN .009 (0.229) REF .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 × 45° (0.38 ± 0.10) .007 – .0098 (0.178 – 0.249) 2 3 4 5 6 7 .0532 – .0688 (1.35 – 1.75) 8 .004 – .0098 (0.102 – 0.249) 0° – 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE .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 U PACKAGE DESCRIPTIO MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.42 ± 0.038 (.0165 ± .0015) TYP 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 1 2 3 4 1.10 (.043) MAX 0.86 (.034) REF 0.18 (.007) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 0.65 (.0256) BSC 0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0204 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 139567fc 15 LT1395/LT1396/LT1397 U PACKAGE DESCRIPTIO S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1633) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 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 0.01 – 0.10 1.00 MAX DATUM ‘A’ 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 1.90 BSC S5 TSOT-23 0302 REV B 139567fc 16 LT1395/LT1396/LT1397 U PACKAGE DESCRIPTIO S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1634) 0.62 MAX 2.90 BSC (NOTE 4) 0.95 REF 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 1.90 BSC S6 TSOT-23 0302 REV B 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 U PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN 7 6 5 .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP 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) 2 3 4 .004 – .010 (0.101 – 0.254) .050 (1.270) BSC SO8 0303 139567fc 18 LT1395/LT1396/LT1397 U PACKAGE DESCRIPTIO S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .337 – .344 (8.560 – 8.738) NOTE 3 .045 ±.005 .050 BSC 14 N 12 11 10 9 8 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 13 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 6 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.483) TYP 7 .050 (1.270) BSC 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) S14 0502 139567fc 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. 19 LT1395/LT1396/LT1397 UO 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. input. Assuming a 75Ω 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 714Ω. The combination of these two inputs gives an output at the cathode of D2 of 2 • VIN with no additional DC offset. The 75Ω back termination resistor R9 halves the signal again such that VOUT equals a buffered version of VIN. Amplifier A1 is used in a positive gain configuration. The feedback resistor R8 is 255Ω. The gain resistor is created from the parallel combination of R6 and R7, giving a Thevenin equivalent 63.5Ω 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 It is important to note that the 4.7µF 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 R1 1000Ω R6 84.5Ω + A1 LT1395 R2 1300Ω – R3 160Ω VIN R4 75Ω R5 2.32Ω C1 4.7µF VS 6V TO 12V D2 D1 1N4148 1N4148 R9 75Ω VOUT R8 255Ω 1395/6/7 TA03 R7 255Ω Figure 6. Single Supply RGB Video Amplifier (1 of 4 Channels) RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1227/LT1229/LT1230 140MHz Single/Dual/Quad Current Feedback Amplifier 1100V/µs Slew Rate, Single Adds Shutdown Pin LT1252/LT1253/LT1254 Low Cost Video Amplifiers Single, Dual and Quad 100MHz Current Feedback Amplifiers LT1363/LT1364/LT1365 70MHz Single/Dual/Quad Op Amps 1000V/µs Slew Rate, Voltage Feedback LT1398/LT1399 Dual/Triple Current Feedback Amplifiers 300MHz Bandwidth, 0.1dB Flatness > 150MHz with Shutdown LT1675 Triple 2:1 Buffered Video Multiplexer 2.5ns Switching Time, 250MHz Bandwidth LT6559 Low Cost Triple Current Feedback Amplifiers 300MHz Bandwidth, Specified at +5V and ±5V, 3mm × 3mm QFN Package 139567fc 20 Linear Technology Corporation LT 0207 REV C • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1999