19-0440; Rev 2; 4/97 KIT ATION EVALU E L B A AVAIL Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers ____________________________Features ♦ 400MHz -3dB Bandwidth (MAX4112/MAX4117) 270MHz -3dB Bandwidth (MAX4113/MAX4119) 300MHz -3dB Bandwidth (MAX4118/MAX4120) ♦ 0.1dB Gain Flatness to 115MHz ♦ 1200V/µs Slew Rate (MAX4112/MAX4117/MAX4119) 1800V/µs Slew Rate (MAX4113/MAX4118/MAX4120) ♦ 280MHz Full-Power Bandwidth (VO = 2Vp-p, MAX4112/MAX4117) 240MHz Full-Power Bandwidth (VO = 2Vp-p, MAX4113/MAX4118/MAX4120) ♦ High Output Drive: 80mA ♦ Low Power: 5mA Supply Current per Channel ________________________Applications ______________Ordering Information Broadcast and High-Definition TV Systems RGB Video Pulse/RF Amplifier Ultrasound/Medical Imaging Active Filters High-Speed ADC Buffers Professional Cameras PART TEMP. RANGE PIN-PACKAGE MAX4112ESA -40°C to +85°C 8 SO MAX4112EUA -40°C to +85°C 8 µMAX* MAX4113ESA -40°C to +85°C 8 SO MAX4117ESA -40°C to +85°C 8 SO MAX4118ESA -40°C to +85°C 8 SO Ordering Information continued at end of data sheet. *Contact factory for µMAX package availability. High-Definition Surveillance __________________________________________________________Pin Configurations TOP VIEW N.C. 1 IN- 2 MAX4119 MAX4120 MAX4112 MAX4113 8 N.C. OUTA 1 7 VCC INA- 2 IN+ 3 6 OUT INA+ VEE 4 5 N.C. SO/µMAX MAX4117 MAX4118 8 VCC 7 OUTB 3 6 INB- VEE 4 5 INB+ SO MAX4119 MAX4120 OUTA 1 14 OUTD OUTA 1 16 OUTD INA- 2 13 IND- INA- 2 15 IND- INA+ 3 12 IND+ INA+ 3 14 IND+ VCC 4 11 VEE VCC 4 13 VEE INB+ 5 10 INC+ INB+ 5 12 INC+ INB- 6 9 INC- INB- 6 11 INC- OUTB 7 8 OUTC OUTB 7 10 OUTC N.C. 8 9 N.C. SO QSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX4112/MAX4113/MAX4117–MAX4120 _______________General Description The single MAX4112/MAX4113, dual MAX4117/ MAX4118, and quad MAX4119/MAX4120 current feedback amplifiers combine high-speed performance with low-power operation. The MAX4112/MAX4117/ MAX4119 are optimized for closed-loop gains of 2V/V or greater, while the MAX4113/MAX4118/MAX4120 are optimized for gains of 8V/V or greater. The MAX4112/MAX4117/MAX4119 and the MAX4113/ MAX4118/MAX4120 require only 5mA of supply current per channel, and deliver 0.1dB gain flatness up to 115MHz and -3db bandwidths of 400MHz (AV ≥ 2V/V) and 300MHz (AV ≥ 8V/V), respectively. Their high slew rates of up to 1800V/µs provide exceptional full-power bandwidths up to 280MHz, making these amplifiers ideal for high-performance pulse and RGB video applications. These high-speed op amps have a wide output voltage swing of ±3.5V into 100Ω and a high current-drive capability of 80mA. MAX4112/MAX4113/MAX4117–MAX4120 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage (VCC to VEE).......................................12V Input Voltage (IN_+, IN_-) ...................(VCC + 0.3V) to (VEE - 0.3V) IN_ _ Current (Note 1) ......................................................±10mA Short-Circuit Duration (VOUT to GND) VIN < 1.5V ...............................................................Continuous VIN > 1.5V ..........................................................................0sec Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C).................471mW 8-Pin µMAX (derate 4.10mW/°C above +70°C) ............330mW 14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW 16-Pin QSOP (derate 9.52mW/°C above +70°C)..........762mW Operating Temperature Range MAX41_ _E_ _ ...................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = +5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 8 UNITS DC SPECIFICATIONS (RL = ∞, unless otherwise noted) Input Offset Voltage Input Offset Voltage Drift VOS VOUT = 0V 1 TCVOS VOUT = 0V 10 Positive Input Bias Current IB+ VOUT = 0V, VIN = -VOS 3.5 20 Negative Input Bias Current IB- VOUT = 0V, VIN = -VOS 3.5 20 IN+ 500 Input Resistance Input Voltage Noise Integrated Voltage Noise Positive Input Current Noise en EnRMS in+ mV µV/°C µA µA kΩ IN- 30 Ω f = 10kHz 2.2 nV/√Hz f = 1MHz to 100MHz 27 µVRMS MAX4112/MAX4117/ MAX4119 13 MAX4113/MAX4118/ MAX4120 9 f = 10kHz pA/√Hz Negative Input Current Noise in- Common-Mode Input Voltage VCM Common-Mode Rejection CMR VCM = ±2.5V 45 50 dB Power-Supply Rejection PSR VS = ±4.5V to ±5.5V 60 80 dB Open-Loop Transimpedance ZOL VOUT = ±2.0V, VCM = 0V, RL = 100Ω 250 500 kΩ Quiescent Supply Current per Amplifier ISY VIN = 0V Output Voltage Swing VOUT Output Current Drive IOUT f = 10kHz 14 -2.5 5 RL = ∞ ±3.5 ±3.8 RL = 100Ω ±3.1 ±3.5 65 80 RL = 30Ω, TA = 0°C to +85°C pA/√Hz 2.5 6.5 V mA V mA AC SPECIFICATIONS (RL = 100Ω, unless otherwise noted) Small Signal -3dB Bandwidth 2 BWSS VOUT ≤ 0.1VRMS MAX4112/MAX4117 400 MAX4113/MAX4119 270 MAX4118/MAX4120 300 _______________________________________________________________________________________ MHz Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers (VCC = +5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AC SPECIFICATIONS (RL = 100Ω, unless otherwise noted) (continued) 0.1dB Gain Flatness Large-Signal -3dB Bandwidth Slew Rate BW0.1dB BWLS SR MAX4112/MAX4117/MAX4119, AVCL = +2 100 MAX4113/MAX4118/MAX4120, AVCL = +8 115 VOUT = 2Vp-p -2V ≤ VOUT ≤ 2V to 0.1%, -1V ≤ VOUT ≤ 1V Settling Time tS tR, tF Differential Gain DG Differential Phase DP Input Capacitance CIN Output Impedance ZOUT Spurious-Free Dynamic Range Two-Tone Third-Order Intercept Crosstalk SFDR IP3 280 MAX4119 145 MAX4113/MAX4118/ MAX4120 240 MAX4112/MAX4117/ MAX4119 1200 MHz V/µs MAX4113/MAX4118/ MAX4120 1800 MAX4112/MAX4117/ MAX4119 15 MAX4113/MAX4118/ MAX4120 10 MAX4112/MAX4117/ MAX4119 35 MAX4113/MAX4118/ MAX4120 25 ns to 0.01%, -1V ≤ VOUT ≤ 1V Rise/Fall Times MAX4112/MAX4117 MHz 10% to 90%, -2V ≤ VOUT ≤ 2V 10% to 90%, -50mV ≤ VOUT ≤ 50mV f = 3.58MHz, RL = 150Ω f = 3.58MHz, RL = 150Ω MAX4112/MAX4117/ MAX4119, AVCL = +2 0.02 MAX4113/MAX4118/ MAX4120, AVCL = +8 0.02 MAX4112/MAX4117/ MAX4119, AVCL = +2 0.03 MAX4113/MAX4118/ MAX4120, AVCL = +8 0.04 f = 10MHz, AVCL = +2 fC = 5MHz, VOUT = 2Vp-p 3 0.8 ns % degrees 2 pF 0.9 Ω MAX4112/MAX4117/ MAX4119, AVCL = +2 -68 MAX4113/MAX4118/ MAX4120, AVCL = +8 -62 dBc MAX4112/MAX4117/MAX4119, fC = 10MHz, fC1 = 10.1MHz, AVCL = +2 36 dB All hostile, VIN = 1Vp-p, f = 10MHz -75 dB Note 1: The MAX4112/MAX4113/MAX4117–MAX4120 are designed to operate in a closed-loop configuration in which the IN- pin is driven by the OUT pin through an external feedback network. If an external voltage source is connected to IN-, current into or out of IN- must be limited to ±10mA, to prevent damage to the part. _______________________________________________________________________________________ 3 MAX4112/MAX4113/MAX4117–MAX4120 ELECTRICAL CHARACTERISTICS (continued) __________________________________________Typical Operating Characteristics (VCC = +5V, VEE = -5V, RF = 499Ω, RL = 100Ω, TA = +25°C, unless otherwise noted.) MAX4112/MAX4117/MAX4119 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2) MAX4112/MAX4117/MAX4119 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +5, +10) 1 0 -1 -2 -3 1 AV = +5V/V RF = 499Ω RG = 124Ω 0 -1 -2 AV = +10V/V RF = 499Ω RG = 54.9Ω -3 RF = RG = 600Ω VOUT ≤ 100mVp-p -5 0.1 1 10 100 10 100 1000 0.1 3 0 -1 -2 -3 RF = 500Ω RG = 68Ω VOUT ≤ 100mVp-p 2 1 0 -1 -2 -3 -5 -6 0 -1 -2 -3 1 10 100 1000 0.1 100 1000 MAX4112/MAX4117/MAX4119 LARGE-SIGNAL PULSE RESPONSE (AVCL = +2) IN GND OUT GND MAX4112-08 IN GND OUT GND VOLTAGE (1V/div) GND VOLTAGE (20mV/div) OUT 10 MAX4112-07 MAX4112-05 GND 1 FREQUENCY (MHz) MAX4112/MAX4117/MAX4119 SMALL-SIGNAL PULSE RESPONSE (AVCL = +10) IN RF = 330Ω RG = 6.8Ω VOUT ≤ 100mVp-p -5 FREQUENCY (MHz) MAX4112/MAX4117/MAX4119 SMALL-SIGNAL PULSE RESPONSE (AVCL = +2) TIME (10ns/div) 1 -6 0.1 FREQUENCY (MHz) 1000 2 -4 -6 1000 100 3 RF = 330Ω RG = 18Ω VOUT ≤ 100mVp-p -4 10 4 NORMALIZED GAIN (dB) 1 100 1 MAX4113/MAX4118/MAX4120 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +50) MAX4112/4113-4a MAX4112/4113-03 2 10 RF = RG = 600Ω VOUT = 2Vp-p FREQUENCY (MHz) 4 NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) 3 1 -3 MAX4113/MAX4118/MAX4120 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +20) 4 0.1 -2 FREQUENCY (MHz) MAX4113/MAX4118/MAX4120 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +8) -5 0 -1 -6 1 FREQUENCY (MHz) -4 1 -5 VOUT ≤ 100mVp-p 0.1 1000 2 -4 -6 -6 4 3 MAX4112/4113-4b -5 MAX4112/4113-02 2 -4 -4 4 NORMALIZED GAIN (dB) 3 NORMALIZED GAIN (dB) 2 MAX4112/MAX4117/MAX4119 LARGE-SIGNAL GAIN vs. FREQUENCY (AVCL = +2) MAX4112-insert A 3 NORMALIZED GAIN (dB) 4 MAX4112/4113-01 4 VOLTAGE (25mV/div) MAX4112/MAX4113/MAX4117–MAX4120 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers TIME (10ns/div) TIME (10ns/div) _______________________________________________________________________________________ Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4112/MAX4117/MAX4119 LARGE-SIGNAL PULSE RESPONSE (AVCL = +10) GND GND OUT GND VOLTAGE (20mV/div) OUT IN VOLTAGE (1V/div) VOLTAGE (50mV/div) GND GND OUT GND TIME (10ns/div) MAX4113/MAX4118/MAX4120 SMALL-SIGNAL PULSE RESPONSE (AVCL = +20) MAX4113/MAX4118/MAX4120 LARGE-SIGNAL PULSE RESPONSE (AVCL = +8) MAX4113/MAX4118/MAX4120 LARGE-SIGNAL PULSE RESPONSE (AVCL = +20) GND IN GND OUT GND OUT GND TIME (10ns/div) MAX4117–MAX4120 CROSSTALK vs. FREQUENCY 30 25 20 10 -40 -50 -60 -70 -80 -90 -110 -120 10 8 -30 -100 15 0 MAX4112/4113-18a 35 AMPLITUDE (dB) 10 -20 MAX4112/4113 -17b 40 SETTLING TIME (ns) 20 GAIN (V/V) GND MAX4113/MAX4118/MAX4120 SETTLING TIME vs. GAIN MAX4112/4113 -17a 30 6 IN TIME (10ns/div) MAX4112/MAX4117/MAX4119 SETTLING TIME vs. GAIN 4 VOLTAGE (1V/div) OUT VOLTAGE (1V/div) GND MAX4112-16 MAX4112-15 TIME (10ns/div) IN 2 IN TIME (10ns/div) MAX4112-14 VOLTAGE (20mV/div) MAX4112-13 MAX4112-12 MAX4112-10 IN TIME (10ns/div) SETTLING TIME (ns) MAX4113/MAX4118/MAX4120 SMALL-SIGNAL PULSE RESPONSE (AVCL = +8) MAX4112/MAX4117/MAX4119 SMALL-SIGNAL PULSE RESPONSE (AVCL = +2, CL = 10pF) 8 16 24 32 GAIN (V/V) 40 48 56 0.1 1 10 100 FREQUENCY (MHz) _______________________________________________________________________________________ 5 MAX4112/MAX4113/MAX4117–MAX4120 ____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, RF = 499Ω, RL = 100Ω, TA = +25°C, unless otherwise noted.) ____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, RF = 499Ω, RL = 100Ω, TA = +25°C, unless otherwise noted.) INPUT VOLTAGE NOISE vs. FREQUENCY NOISE (nV/√Hz) 75 55 10 MAX4112/MAX4117/MAX4119 35 100 15 -5 1 0.1 1 10 100 1000 10 1 10 100 1k 10k 100k 1M 10M 1 10 100 1k 100k 1M 10M FREQUENCY (Hz) MAX4113/MAX4118/MAX4120 INPUT CURRENT NOISE vs. FREQUENCY CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY MAX4112/MAX4117/MAX4119 HARMONIC DISTORTION vs. FREQUENCY OUTPUT IMPEDANCE (Ω) 100 IN+ 10 MAX4112/4113-22 100 10 1 0 VOUT = 2Vp-p -10 HARMONIC DISTORTION (dBc) MAX4112/4113-21 1000 -20 2nd (AVCL = +5) -30 -40 2nd (AVCL = +2) -50 -60 -70 3rd (AVCL = +2, AVCL = +5) -80 -90 1 0.1 1 10 100 1k 10k 100k 1M 10M -100 0.1 1 10 100 0.1 500 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) MAX4113/MAX4118/MAX4120 HARMONIC DISTORTION vs. FREQUENCY MAX4112/MAX4117/MAX4119 5MHz HARMONIC DISTORTION vs. OUTPUT SWING MAX4112/MAX4117/MAX4119 5MHz HARMONIC DISTORTION vs. LOAD RESISTANCE -40 3rd (AVCL = +20) -50 -60 -70 -80 3rd (AVCL = +8) -90 -20 -30 -40 -50 -60 2nd -70 -80 3rd 0.1 1 10 FREQUENCY (MHz) 100 AVCL = +2 VOUT = 2Vp-p -10 -20 -30 -40 -50 -60 -70 2nd -80 3rd -90 -90 -100 0 MAX4112/4113-27 2nd (AVCL = +8) -30 AVCL = +2 -10 HARMONIC DISTORTION (dBc) -20 2nd (AVCL = +20) 0 MAX4112/4113 -26 VOUT = 2Vp-p HARMONIC DISTORTION (dBc) 0 MAX4112/4113-24 FREQUENCY (Hz) -10 MAX4112/4113-23 FREQUENCY (Hz) IN- 6 10k FREQUENCY (MHz) 1000 NOISE (pA/√Hz) IN+, IN- MAX4113/MAX4118/MAX4120 NOISE (pA/√Hz) 95 1000 MAX4112/4113-19 100 MAX4112/4113-18b POWER-SUPPLY REJECTION (dB) 105 MAX4112/MAX4117/MAX4119 INPUT CURRENT NOISE vs. FREQUENCY MAX4112/4113-20 POWER-SUPPLY REJECTION vs. FREQUENCY HARMONIC DISTORTION (dBc) MAX4112/MAX4113/MAX4117–MAX4120 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers -100 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT SWING (Vp-p) 3.5 4.0 0 200 400 600 LOAD RESISTANCE (Ω) _______________________________________________________________________________________ 800 1000 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers MAX4113/MAX4118/MAX4120 5MHz HARMONIC DISTORTION vs. LOAD RESISTANCE -40 -50 2nd -60 -70 3rd -80 -30 -40 -50 -60 -70 -80 -90 -90 2.0 2.5 3.0 3.5 MAX4113/MAX4118/MAX4120 DIFFERENTIAL GAIN and PHASE 0.01 0.00 -0.01 15 10 0.1 0.000 -0.005 0 100 IRE 0.02 700 600 500 400 100 RL = 150Ω 200 -75 0 POSITIVE OUTPUT VOLTAGE SWING vs. TEMPERATURE 3.80 3.60 3.40 3.20 -50 -25 0 -3.40 -3.60 -3.80 -4.00 RL = ∞ -4.20 RL = 100Ω 25 50 TEMPERATURE (°C) 75 100 125 -4.40 -75 0 25 50 75 100 125 TEMPERATURE (°C) -2.00 -2.50 INPUT BIAS CURRENT (µA) 4.00 RL = 100Ω -3.20 -25 POSITIVE INPUT BIAS CURRENT vs. TEMPERATURE MAX4112/4113-34b RL = ∞ -3.00 OUTPUT VOLTAGE SWING (V) 4.20 -50 100 IRE NEGATIVE OUTPUT VOLTAGE SWING vs. TEMPERATURE MAX4112/4113-34a 4.40 MAX4113/MAX4118/MAX4120 300 -0.04 100 MAX4112/MAX4117/MAX4119 800 0.00 -0.02 10 900 -0.06 IRE 1 OPEN-LOOP TRANSIMPEDANCE vs. TEMPERATURE 0.015 0.010 0.005 PHASE (degrees) 0.02 20 FREQUENCY (MHz) RL = 150Ω 0.04 RL = 150Ω MAX4113/MAX4118/MAX4120 25 1000 MAX4112/4113-32 0.025 0.020 100 IRE 0 OUTPUT VOLTAGE SWING (V) 800 MAX4112/MAX4117/MAX4119 DIFFERENTIAL GAIN and PHASE 0.04 3.00 -75 600 400 LOAD RESISTANCE (Ω) 0 0.03 200 OUTPUT VOLTAGE SWING (Vp-p) RL = 150Ω 30 0 0 4.0 TRANSIMPEDANCE (kΩ) 1.5 MAX4112/4113-31 0.005 0.000 -0.005 -0.010 -0.015 -0.020 -0.025 1.0 GAIN (%) GAIN (%) 0.5 MAX4112/MAX4117/MAX4119 35 5 3rd -100 -100 PHASE (degrees) 2nd MAX4112/4113-30 -20 40 MAX4112/4113-33 -30 AVCL = +8 VOUT = 2Vp-p -10 MAX4112/4113-35a -20 0 MAX4112/4113-29 AVCL = +8 HARMONIC DISTORTION (dBc) HARMONIC DISTORTION (dBc) MAX4112/4113-28 0 -10 TWO-TONE THIRD-ORDER INTERCEPT vs. FREQUENCY THIRD-ORDER INTERCEPT (dBm) MAX4113/MAX4118/MAX4120 5MHz HARMONIC DISTORTION vs. OUTPUT SWING -3.00 -3.50 -4.00 -4.50 -5.00 -50 -25 0 25 50 TEMPERATURE (°C) 75 100 125 -75 -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) _______________________________________________________________________________________ 7 MAX4112/MAX4113/MAX4117–MAX4120 ____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, RF = 499Ω, RL = 100Ω, TA = +25°C, unless otherwise noted.) ____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, RF = 499Ω, RL = 100Ω, TA = +25°C, unless otherwise noted.) NEGATIVE INPUT BIAS (IB-) CURRENT vs. TEMPERATURE 3 6 MAX4112/4113 -37 7 2 VOLTAGE (mV) INPUT BIAS CURRENT (µA) INPUT OFFSET VOLTAGE vs. TEMPERATURE MAX4112/4113-36 8 5 4 3 2 1 0 1 0 -1 -75 -50 -25 0 25 50 75 100 125 -75 -50 -25 TEMPERATURE (°C) POWER-SUPPLY CURRENT vs. TEMPERATURE (PER AMPLIFIER) ICC 2.00 0 -2.00 IEE 7.0 6.5 6.0 5.5 5.0 4.5 4.0 -6.00 3.5 3.0 -8.00 -75 -50 -25 0 25 50 TEMPERATURE (°C) 8 7.5 OUTPUT SWING (Vp-p) 4.00 -4.00 100 125 MAX4112/4113-39 6.00 0 25 50 75 TEMPERATURE (°C) OUTPUT SWING vs. LOAD RESISTANCE MAX4112/4113-38 8.00 CURRENT (mA) MAX4112/MAX4113/MAX4117–MAX4120 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers 75 100 125 25 50 75 100 LOAD RESISTANCE (Ω) _______________________________________________________________________________________ 125 150 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers PIN PIN MAX4112 MAX4117 NAME MAX4113 MAX4118 SO/µMAX SO MAX4119/MAX4120 FUNCTION FUNCTION NAME FUNCTION SO QSOP No Connection. Not internally connected. 1 1 OUTA Amplifier A Output 2 2 INA- Amplifier A Inverting Input Amplifier A Output 3 3 INA+ Amplifier A Noninverting Input 4 4 VCC Positive Power Supply. Connect to +5V. 1, 5, 8 — N.C. — 1 OUTA 2 — IN- — 2 INA- Amplifier A Inverting Input 3 — IN+ Noninverting Input 5 5 INB+ Amplifier B Noninverting Input Amplifier A Noninverting Input 6 6 INB- Amplifier B Inverting Input Negative Power Supply. Connect to -5V. 7 7 OUTB — 8, 9 N.C. — 3 INA+ Inverting Input Amplifier B Output 4 4 VEE — 5 INB+ Amplifier B Noninverting Input 6 — OUT Amplifier Output 8 10 Amplifier B Inverting Input 9 11 INC- Amplifier C Inverting Input Amplifier B Output 10 12 INC+ Amplifier C Noninverting Input Positive Power Supply. Connect to +5V. 11 13 VEE 12 14 IND+ Amplifier D Noninverting Input 13 15 IND- Amplifier D Inverting Input 14 16 — 6 INB- — 7 OUTB 7 8 VCC _______________Detailed Description The MAX4112/MAX4117/MAX4119 are optimized for closed-loop gains (AVCL) of 2V/V or greater, while the MAX4113/MAX4118/MAX4120 are optimized for closed-loop gains of 8V/V or greater. These low-power, high-speed, current feedback amplifiers operate from ±5V supplies. They are designed to drive video loads with low distortion characteristics. The MAX4112/ MAX4117/MAX4119’s differential gain and phase are 0.02% and 0.03°, respectively; the MAX4113/ MAX4118/MAX4120 exhibit gain/phase error specifications of 0.02% and 0.04°, respectively. These characteristics, plus a wide 0.1dB gain flatness, make the MAX4112/MAX4113/MAX4117–MAX4120 ideal for use RG RF RIN +1 +1 ZOL VIN VOUT MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120 No Connection. Not internally connected. OUTC Amplifier C Output Negative Power Supply. Connect to -5V. OUTD Amplifier D Output in broadcast and graphics video systems. The combination of ultra-high speed and low power makes these parts suitable for use in general-purpose, high-speed applications, such as medical imaging, industrial instrumentation, and communications systems. __________Applications Information Theory of Operation Since these devices are current-feedback amplifiers, their open-loop transfer function is expressed as a transimpedance, ∆VOUT/∆IIN, or ZOL. The frequency behavior of the open-loop transimpedance is similar to the open-loop gain of a voltage feedback amplifier. That is, it has a large DC value and decreases at approximately 6dB per octave. Analyzing the follower with gain, as shown in Figure 1, yields the following transfer function: ZOL(S) VOUT = Gx VIN ZOL(S) + G x (RIN + RF ) where G = AVCL = 1 + (RF / RG), and RIN = 1 /gM ≅ 30Ω. Figure 1. Current Feedback Amplifier _______________________________________________________________________________________ 9 MAX4112/MAX4113/MAX4117–MAX4120 _____________________________________________________________Pin Descriptions MAX4112/MAX4113/MAX4117–MAX4120 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers At low gains, G x RIN << RF. Therefore, the closed-loop bandwidth is essentially independent of closed-loop gain. Similarly, ZOL >> RF at low frequencies, so that: VIN RF RG RT RO VOUT = G = 1 + (RF / RG ) VIN VOUT Layout and Power-Supply Bypassing The MAX4112/MAX4113/MAX4117–MAX4120 have an RF bandwidth and consequently require careful board layout, including the possible use of constant-impedance microstrip or stripline techniques. To realize the full AC performance of these high-speed amplifiers, pay careful attention to power-supply bypassing and board layout. The PC board should have at least two layers: a signal and power layer on one side, and a large, low-impedance ground plane on the other side. The ground plane should be as free of voids as possible. With multilayer boards, locate the ground plane on a layer that incorporates no signal or power traces. Regardless of whether a constant-impedance board is used, observe the following guidelines when designing the board. Wire-wrapped boards are much too inductive, and breadboards are much too capacitive; neither should be used. IC sockets increase parasitic capacitance and inductance, and should not be used. In general, surface-mount components give better highfrequency performance than through-hole components. They have shorter leads and lower parasitic reactances. Keep lines as short and as straight as possible. Do not make 90° turns; round all corners. Observe high-frequency bypassing techniques to maintain the amplifier’s accuracy. The bypass capacitors should include a 1000pF ceramic capacitor between each supply pin and the ground plane, located as close to the package as possible. Next, place a MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120 RS VOUT = -(RF/RG) x VIN Figure 2a. Inverting Gain Configuration RF RG RO VOUT VIN MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120 RT VOUT = [1+ (RF/RG)] x VIN Figure 2b. Noninverting Gain Configuration 0.01µF to 0.1µF ceramic capacitor in parallel with each 1000pF capacitor, and as close to them as possible. Then place a 10µF to 15µF low-ESR tantalum at the point of entry (to the PC board) of the power-supply pins. The power-supply trace should lead directly from the tantalum capacitor to the V CC and VEE pins. To minimize parasitic inductance, keep PC traces short and use surface-mount components. Table 1. Recommended Component Values COMPONENT RF (Ω) AVCL = +2 AVCL = +8 MAX4112 MAX4117 MAX4119 MAX4113 MAX4118 MAX4120 600 600 500 500 330 330 RG (Ω) 600 600 500 69 47 47 RO (Ω) 49.9 49.9 49.9 49.9 49.9 49.9 RT (Ω) 49.9 49.9 49.9 49.9 49.9 49.9 -3dB Small-Signal Bandwidth (MHz) 400 400 270 270 300 300 0.1dB Gain Flatness (MHz) 100 100 100 115 115 115 Large-Signal Bandwidth (MHz) 280 280 145 240 240 240 10 ______________________________________________________________________________________ Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers IBVOUT IB+ RS Calculating total output noise in a similar manner yields: ( Choosing Feedback and Gain Resistors The MAX4112/MAX4113/MAX4117–MAX4120 are current feedback amplifiers. Increasing feedback resistor values will decrease peaking. Use the input resistor (RG) to change the magnitude of the gain. Figure 2 shows the standard inverting and noninverting configurations. Notice that the gain of the noninverting circuit (Figure 2b) is 1 plus the magnitude of the inverting closed-loop gain (Table 1). DC and Noise Errors There are several major error sources to consider in any operational amplifier. These apply equally to the MAX4112/MAX4113/MAX4117–MAX4120. Offset-error terms are given by the equation below. Voltage and current-noise errors are root-square summed and therefore computed separately. In Figure 3, the total output offset voltage is determined by: a) The input offset voltage (VOS) times the closed-loop gain (1 + (RF / RG)). b) The positive input bias current (IB+) times the source resistor (RS) (usually 50Ω or 75Ω), plus the negative input bias current (IB-) times the parallel combination of RG and RF. In current-mode feedback amplifiers, the input bias currents may flow into or out of the device. For this reason, there is no benefit to matching the resistance at both inputs. The equation for total DC error is: R VOUT = (IB+ )RS + (IB− ) RF || RG + VOS 1+ F RG [ ( ) ] c) The total output-referred noise voltage is: R en(OUT) = 1 + F R G ) + (14x10 en(OUT) = (1 + 1) 13x10−12 x50 Figure 3. Output Offset Voltage 2 2 [(in + )RS ] + [(in − )RF || RG ] + (en )2 The MAX4112/MAX4117/MAX4119 have a very low, 2nV/√Hz noise voltage. The current noise at the positive input (in+) is 13pA/√Hz, and the current noise at the inverting input (in-) is 14pA/√Hz. 2 −12 ) + (2x10 ) 2 x300 −9 2 en(OUT) = 9.4nV/ Hz With a 200MHz system bandwidth, this calculates to 133µVRMS (approximately 797µVp-p, choosing the sixsigma value). Resistor Types Surface-mount resistors are the best choice for highfrequency circuits. They are of similar material to metalfilm resistors, but are deposited using a thick-film process in a flat, linear manner that minimizes inductance. Their small size and lack of leads also minimizes parasitic inductance and capacitance, yielding more predictable performance. Metal-film resistors with leads are manufactured using a thin-film process where resistive material is deposited in a spiral layer around a ceramic rod. Although the materials used are noninductive, the spiral winding presents a small inductance (about 5nH) that may have an adverse effect on high-frequency circuits. Carbon-composition resistors with leads are manufactured by pouring the resistor material into a mold. This process yields relatively low-inductance resistors that are very useful in high-frequency applications, although they tend to cost more and have more thermal noise than other types. The ability of carbon-composition resistors to self-heal after a large current overload makes them useful in high-power RF applications. For general-purpose use, surface-mount metal-film resistors seem to have the best overall performance for low cost, low inductance, and low noise. Video Line Driver The MAX4112/MAX4113/MAX4117–MAX4120 are optimized (gain flatness) to drive coaxial transmission lines when the cable is terminated at both ends, as shown in Figure 4. Cable frequency response can cause variations in the flatness of the signal. ______________________________________________________________________________________ 11 MAX4112/MAX4113/MAX4117–MAX4120 RF RG MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120 An example of the DC error calculations, using the MAX4112 typical data and the typical operating circuit where RF = RG = 600Ω (RF || RG = 300Ω) and RS = 50Ω, gives the following: VOUT = (3.5 x 10-6 x 50 + 3.5 x 10-6 x 300 + 10-3) (1 + 1) VOUT = 4.45mV Driving Capacitive Loads 12 CL = 15pF 10 GAIN (dB) The MAX4112/MAX4113/MAX4117–MAX4120 are optimized for AC performance. They are not designed to drive highly capacitive loads. Reactive loads decrease phase margin and can produce excessive ringing and oscillation. Figure 5a shows a circuit that eliminates this problem. The small (usually 5Ω to 22Ω) isolation resistor, RS, placed before the reactive load prevents ringing and oscillation. At higher capacitive loads, AC performance is controlled by the interaction of the load capacitance and isolation resistor. CL = 10pF 8 6 CL = 5pF 4 2 RG 0 RF 0.1 75Ω 75Ω MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120 75Ω 1000 12 RS = 0Ω CL = 10pF 10 RS = 4.7Ω 8 RF RS VIN 100 Figure 5b. Frequency Response vs. Capacitive Load— No Isolation Resistor Figure 4. Video Line Driver RG 10 FREQUENCY (MHz) VIDEO OUT 75Ω CABLE VIDEO IN 1 75Ω CABLE GAIN (dB) MAX4112/MAX4113/MAX4117–MAX4120 Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers RS = 10Ω 6 4 RS = 22Ω 2 0 MAX4112 MAX4113 MAX4117 MAX4118 MAX4119 MAX4120 CL RL -2 0.1 1 10 100 1000 FREQUENCY (MHz) Figure 5c. Frequency Response vs. Isolation Resistance (see Figure 5a for circuit) Figure 5a. Using an Isolation Resistor (RS) for High Capacitive Loads _Ordering Information (continued) PART TEMP. RANGE PIN-PACKAGE MAX4119ESD -40°C to +85°C 14 SO MAX4119EEE -40°C to +85°C 16 QSOP* MAX4120ESD -40°C to +85°C 14 SO MAX4120EEE -40°C to +85°C 16 QSOP* ___________________Chip Information TRANSISTOR COUNT: 53 (MAX4112/MAX4113) 112 (MAX4117/MAX4118) 220 (MAX4119/MAX4120) SUBSTRATE CONNECTED TO VEE *Contact factory for QSOP package availability. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.