19-1369; Rev 0; 7/98 KIT ATION EVALU E L B A AVAIL Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable Features ♦ Low Supply Current: 1.5mA per Amplifier The MAX4188/MAX4189 are available in a tiny 16-pin QSOP package, and the MAX4190 is available in a space-saving 8-pin µMAX package. ♦ Available in Space-Saving Packages 16-Pin QSOP (MAX4188/MAX4189) 8-Pin µMAX (MAX4190) ♦ Fast Enable/Disable Times: 120ns/35ns ♦ Very Low Switching Transient: 45mVp-p ♦ High Speed 200MHz -3dB Small-Signal Bandwidth (MAX4188, AVCL ≥ +2) 250MHz -3dB Small-Signal Bandwidth (MAX4189, AVCL ≥ +1) 185MHz -3dB Small-Signal Bandwidth (MAX4190, AVCL ≥ +2) ♦ High Slew Rate 350V/µs (MAX4188, AVCL ≥ +2) 175V/µs (MAX4189, AVCL ≥ +1) ♦ Excellent Video Specifications 85MHz -0.1dB Gain Flatness (MAX4190) 30MHz -0.1dB Gain Flatness (MAX4189) Differential Gain/Phase Errors 0.03%/0.05° (MAX4188) ♦ Low-Power Disable Mode Inputs Isolated, Outputs Placed in High-Z Supply Current Reduced to 450µA per Amplifier ♦ Fast Settling Time of 22ns to 0.1% ♦ Low Distortion 70dB SFDR (fc = 5MHz, VO = 2Vp-p, MAX4188) Applications Ordering Information High-Definition Surveillance Video High-Speed Switching/Multiplexing Portable/Battery-Powered Video/Multimedia Systems High-Speed Analog-to-Digital Buffers PART TEMP. RANGE PIN-PACKAGE MAX4188ESD -40°C to +85°C 14 SO MAX4188EEE -40°C to +85°C 16 QSOP Ordering Information continued at end of data sheet. Medical Imaging Selector Guide High-Speed Signal Processing Professional Cameras PART OPTIMIZED FOR: AMPLIFIERS PER PKG. MAX4188 AV ≥ +2V/V 3 14-pin SO, 16-pin QSOP MAX4189 AV ≥ +1V/V 3 14-pin SO, 16-pin QSOP MAX4190 AV ≥ +2V/V 1 8-pin µMAX/SO CCD Imaging Systems RGB Distribution Amplifiers Pin Configuration appears at end of data sheet. PIN-PACKAGE ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. MAX4188/MAX4189/MAX4190 General Description The MAX4188/MAX4189/MAX4190 are low-power, current-feedback video amplifiers featuring fast disable/enable times and low switching transients. The triple MAX4188 and the single MAX4190 are optimized for applications with closed-loop gains of +2V/V (6dB) or greater and provide a -3dB bandwidth of 200MHz and 185MHz, respectively. The triple MAX4189 is optimized for closed-loop applications with gains of +1V/V (0dB) or greater and provides a 250MHz -3dB bandwidth. These amplifiers feature 0.1dB gain flatness up to 80MHz with differential gain and phase errors of 0.03% and 0.05°. These features make the MAX4188 family ideal for video applications. The MAX4188/MAX4189/MAX4190 operate from a +5V single supply or from ±2.25V to ±5.5V dual supplies. These amplifiers consume only 1.5mA per amplifier and are capable of delivering ±55mA of output current, making them ideal for portable and battery-powered equipment. The MAX4188/MAX4189/MAX4190 have a high-speed disable/enable mode that isolates the inputs, places the outputs in a high-impedance state, and reduces the supply current to 450µA per amplifier. Each amplifier can be disabled independently. High off isolation, low switching transient, and fast enable/disable times (120ns/35ns) allow these amplifiers to be used in a wide range of multiplexer applications. A settling time of 22ns to 0.1%, a slew rate of up to 350V/µs, and low distortion make these devices useful in many generalpurpose, high-speed applications. MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE)................................................+12V IN_+, IN_-, DISABLE_ Voltage .........(VEE - 0.3V) to (VCC + 0.3V) Differential Input Voltage (IN_+ to IN_-)..............................±1.5V Maximum Current into IN_+ or IN_-..................................±10mA Output Short-Circuit Current Duration........................Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW 14-Pin SO (derate 8.3mW/°C above +70°C) ..................667mW 16-Pin QSOP (derate 8.3mW/°C above +70°C)...............667mW Operating Temperature Range............................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°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. DC ELECTRICAL CHARACTERISTICS—Dual Supplies (VCC = +5V; VEE = -5V; IN+ = 0; DISABLE_ ≥ 3.2V; MAX4188: AV = +2V/V, RF = RG = 910Ω for RL = 1kΩ and RF = RG = 560Ω for RL = 150Ω; MAX4189: AV = +1V/V, RF = 1600Ω for RL = 1kΩ and RF = 1100Ω for RL = 150Ω; MAX4190: AV = +2V/V, RF = RG = 1300Ω for RL = 1kΩ, RF = RG = 680Ω for RL = 150Ω; TA = TMIN to TMAX, unless otherwise noted. Typical values are specified at TA = +25°C.) PARAMETER SYMBOL Operating Supply Voltage CONDITIONS MIN Inferred from PSRR tests ±2.25 Input Voltage Range VCM Guaranteed by CMRR test ±3.1 Input Offset Voltage VOS VCM = 0 (Note 1) Input Offset Voltage Tempco TCVOS Input Bias Current (Negative Input) MAX UNITS ±5.5 V ±6 mV ±3.4 ±1 V ±10 Input Offset Voltage Matching Input Bias Current (Positive Input) TYP µV/°C ±1 IB+ IB-3.1V ≤ VCM ≤ 3.1V, VIN+ - VIN- ≤ 1V ±10 ±2 ±12 µA RIN+ Input Resistance (Negative Input) RIN- 300 Ω Input Capacitance (Positive Input) CIN 2.5 pF 56 68 dB Open-Loop Transresistance CMRR TR Output Voltage Swing VSW Output Current IOUT Output Short-Circuit Current Output Resistance -3.1V ≤ VCM ≤ 3.1V -3.1V ≤ VOUT ≤ 3.1V, RL = 1kΩ 350 µA Input Resistance (Positive Input) Common-Mode Rejection Ratio 100 mV ±1 1 7 0.3 2 RL = 1kΩ ±3.5 ±4.0 RL = 150Ω ±3.0 ±3.3 RL = 30Ω ±20 ±55 mA ±60 mA -2.8V ≤ VOUT ≤ 2.8V, RL = 150Ω ISC ROUT IOUT(OFF) DISABLE_ ≤ VIL, VOUT ≤ ±3.5V (Note 2) Disabled Output Capacitance COUT(OFF) DISABLE_ ≤ VIL, VOUT ≤ ±3.5V DISABLE Low Threshold VIL (Note 3) DISABLE High Threshold VIH (Note 3) DISABLE Input Current IIN VEE ≤ DISABLE_ ≤ VCC ±0.8 VEE = -5V, VCC = 4.5V to 5.5V 60 75 PSRR- VCC = 5V, VEE = -4.5V to -5.5V 60 73 2 µA pF VCC - 3 V 2 µA V 0.1 PSRR+ IS(OFF) Ω ±5 VCC - 1.8 Power-Supply Rejection Ratio (VEE) Disabled Supply Current (per Amplifier) V 5 Power-Supply Rejection Ratio (VCC) IS MΩ 0.2 Disabled Output Leakage Current Quiescent Supply Current (per Amplifier) kΩ dB dB RL = open 1.5 1.85 mA DISABLE_ ≤ VIL, RL = open 0.45 0.65 mA _______________________________________________________________________________________ Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable (VCC = +5V; VEE = 0; IN+ = 2.5V; DISABLE_ ≥ 3.2V; RL to VCC / 2; MAX4188: AV = +2V/V, RF = RG = 1.1kΩ for RL = 1kΩ and RF = RG = 620Ω for RL = 150Ω; MAX4189: AV = +1V/V, RF = 1500Ω for RL = 1kΩ and RF = 1600Ω for RL = 150Ω; MAX4190: AV = +2V/V, RF = RG = 1300Ω for RL = 1kΩ, RF = RG = 680Ω for RL = 150Ω; TA = TMIN to TMAX, unless otherwise noted. Typical values are specified at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage Inferred from PSRR tests Input Voltage Range VCM Guaranteed by CMRR test Input Offset Voltage VOS VCM = 2.5V (Note 1) Input Offset Voltage Tempco 4.5 1.6 to 3.4 5.5 1.3 to 3.7 ±1.5 TCVOS Input Offset Voltage Matching V V ±6.0 mV ±10 µV/°C ±1 mV Input Bias Current (Positive Input) IB+ ±1 ±10 µA Input Bias Current (Negative Input) IB- ±2 ±12 µA Input Resistance (Positive Input) RIN+ Input Resistance (Negative Input) Input Capacitance (Positive Input) Common-Mode Rejection Ratio Open-Loop Transresistance Output Voltage Swing Output Current 350 kΩ RIN- 300 Ω CIN 2.5 pF Output Resistance 100 dB 1.5V ≤ VCM ≤ 3.5V 48 65 1.3V ≤ VOUT ≤ 3.7V, RL = 1kΩ 1.0 6.5 1.45V ≤ VOUT ≤ 3.55V, RL = 150Ω 0.2 1.0 RL = 1kΩ 1.2 to 3.8 0.9 to 4.1 RL = 150Ω 1.4 to 3.6 1.15 to 3.85 RL = 30Ω ±16 ±28 mA ISC ±50 mA ROUT 0.2 Ω CMRR TR VSW IOUT Output Short-Circuit Current 1.6V ≤ VCM ≤ 3.4V, VIN+ - VIN- ≤ 1V Disabled Output Leakage Current IOUT(OFF) Disabled Output Capacitance COUT(OFF) DISABLE_ ≤ VIL, 1.2V ≤ VOUT ≤ 3.8V DISABLE_ ≤ VIL, 1.2V ≤ VOUT ≤ 3.8V (Note 2) DISABLE Low Threshold VIL (Note 3) DISABLE High Threshold VIH (Note 3) DISABLE Input Current IIN 0 ≤ DISABLE_ ≤ VCC Power-Supply Rejection Ratio (VCC) PSRR+ Quiescent Supply Current (per Amplifier) IS Disabled Supply Current (per Amplifier) IS(OFF) VCC = 4.5V to 5.5V 0.8 MΩ V ±5 5 pF VCC - 3 VCC - 1.8 V V 0.1 60 µA 2 75 µA dB RL = open 1.5 1.85 mA DISABLE_ ≤ VIL, RL = open 0.45 0.65 mA _______________________________________________________________________________________ 3 MAX4188/MAX4189/MAX4190 DC ELECTRICAL CHARACTERISTICS—Single Supply MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4188) (VCC = +5V, VEE = -5V, VIN = 0, DISABLE_ ≥ 3V, AV = +2V/V, RF = RG = 910Ω for RL = 1kΩ or RF = RG = 560Ω for RL = 150Ω; TA = +25°C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth SYMBOL BW-3dB Peaking Bandwidth for 0.1dB Flatness BW0.1dB Large-Signal -3dB Bandwidth BWLS CONDITIONS MIN TYP RL = 1kΩ 200 RL = 150Ω 160 RL = 1kΩ 0.25 RL = 150Ω 0.1 RL = 1kΩ 60 RL = 150Ω 80 VOUT = 2Vp-p Slew Rate SR VOUT = 4V step, RL = 150Ω Settling Time to 0.1% tS VOUT = 4V step RL = 1kΩ 100 RL = 150Ω 100 Positive slew 350 Negative slew 280 22 Rise time 10 Fall time 12 fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ 70 RL = 150Ω 56 Second Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -70 RL = 150Ω -66 Third Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -73 RL = 150Ω -56 RL = 1kΩ 0.05 RL = 150Ω 0.32 RL = 1kΩ 0.03 RL = 150Ω 0.04 Rise/Fall Time Spurious-Free Dynamic Range VOUT = 4V step SFDR Differential Phase Error DP NTSC Differential Gain Error DG NTSC Input Noise Voltage Density en f = 10kHz Input Noise Current Density Output Impedance in f = 10kHz ZOUT f = 10MHz 2 Positive input 4 Negative input 5 Crosstalk f = 10MHz, input referred All Hostile Off Isolation f = 10MHz, input referred Gain Matching to 0.1dB MAX UNITS MHz dB MHz MHz V/µs V/µs ns ns dB dBc dBc degrees % nV/√Hz pA/√Hz 4 Ω -55 dB -65 dB 100 MHz Amplifier Enable Time tON Delay from DISABLE to 90% of VOUT, VIN = 0.5V 120 ns Amplifier Disable Time tOFF Delay from DISABLE to 10% of VOUT, VIN = 0.5V 35 ns Positive transient 30 Negative transient 15 Disable/Enable Switching Transient 4 _______________________________________________________________________________________ mV Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable (VCC = +5V, VEE = -5V, VIN = 0, DISABLE_ ≥ 3V, AV = +1V/V, RF = 1600Ω for RL = 1kΩ and RF = 1100Ω for RL = 150Ω; TA = +25°C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth SYMBOL BW-3dB Peaking Bandwidth for 0.1dB Flatness BW0.1dB Large-Signal -3dB Bandwidth BWLS CONDITIONS MIN TYP RL = 1kΩ 250 RL = 150Ω 210 RL = 1kΩ 1.4 RL = 150Ω 0.15 RL = 1kΩ 7 RL = 150Ω 30 VOUT = 2Vp-p Slew Rate SR VOUT = 4V step, RL = 150Ω Settling Time to 0.1% tS VOUT = 4V step RL = 1kΩ 60 RL = 150Ω 55 Positive slew 175 Negative slew 150 28 Rise time 20 Fall time 22 fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ 65 RL = 150Ω 51 Second Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -65 RL = 150Ω -63 Third Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -70 RL = 150Ω -51 RL = 1kΩ 0.02 RL = 150Ω 0.66 RL = 1kΩ 0.07 RL = 150Ω 0.18 Rise/Fall Time VOUT = 4V step Spurious-Free Dynamic Range SFDR Differential Phase Error DP NTSC Differential Gain Error DG NTSC Input Noise Voltage Density en f = 10kHz Input Noise Current Density in f = 10kHz ZOUT f = 10MHz 2 Positive input 4 Negative input 5 MAX UNITS MHz dB MHz MHz V/µs V/µs ns ns dB dBc dBc degrees % nV/√Hz pA/√Hz 4 Ω Crosstalk f = 10MHz, input referred -57 dB All Hostile Off Isolation f = 10MHz, input referred -55 dB Output Impedance Gain Matching to 0.1dB Amplifier Enable Time tON Delay from DISABLE to 90% of VOUT, VIN = 0.5V Amplifier Disable Time tOFF Delay from DISABLE to 10% of VOUT, VIN = 0.5V Disable/Enable Switching Transient 24 MHz 120 ns 40 ns Positive transient 70 Negative transient 110 mV _______________________________________________________________________________________ 5 MAX4188/MAX4189/MAX4190 AC ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX4189) MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable AC & DYNAMIC PERFORMANCE—Dual Supplies (MAX4190) (V CC = +5V, V EE = -5V, V IN = 0, A V = +2V/V; R F = R G = 1300Ω for R L = 1kΩ and R F = R G = 680Ω for R L = 150Ω, TA = +25°C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth SYMBOL BWSS Peaking Bandwidth for 0.1dB Flatness BWLS Large-Signal -3dB Bandwidth BWLS CONDITIONS MIN TYP RL = 1kΩ 185 RL = 150Ω 150 RL = 1kΩ 0.1 RL = 150Ω 0.1 RL = 1kΩ 85 RL = 150kΩ 75 VO = 2Vp-p RL = 1kΩ 95 RL = 150Ω 95 Positive slew 340 Negative slew 270 Slew Rate SR VO = 4V step, RL = 150Ω Settling Time to 0.1% tS VO = 2V step tR VO = 4V step, RL = 150Ω Rise time 10 Fall time 12 Spurious-Free Dynamic Range fC = 5MHz, VO = 2Vp-p RL = 1kΩ 61 RL = 150Ω 55 Second Harmonic Distortion fC = 5MHz, VO = 2Vp-p RL = 1kΩ -65 RL = 150Ω -55 Third Harmonic Distortion fC = 5MHz, VO = 2Vp-p RL = 1kΩ -73 RL = 150Ω -61 RL = 1kΩ 0.03 RL = 150Ω 0.07 RL = 1kΩ 0.06 RL = 150Ω 0.45 Rise/Fall Time tF Differential Gain Error DG NTSC Differential Phase Error DP NTSC Input Noise Current Density Input Noise Voltage Density Output Impedance f = 10kHz 22 Positive input 4 Negative input 5 MAX UNITS MHz dB MHz MHz V/µs ns ns dB dBc dBc degrees degrees pA/√Hz en f = 10kHz 2 nV/√Hz ZOUT f = 10MHz 4 Ω All Hostile Off Isolation -60 dB Turn-On Time from DISABLE tON 120 ns Turn-Off Time from DISABLE tOFF 35 ns Disable/Enable Switching Transient 6 f = 10MHz, input referred BWLS Positive transient 30 Negative transient 15 _______________________________________________________________________________________ mV Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable (VCC = +5V, VEE = 0, VIN = 2.5V, DISABLE_ ≥ 3V, RL to VCC / 2, AV = +2V/V, RF = RG = 1.1kΩ for RL = 1kΩ to VCC / 2 and RF = RG = 620Ω for RL = 150Ω; TA = +25°C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth SYMBOL BW-3dB Peaking Bandwidth for 0.1dB Flatness BW0.1dB Large-Signal -3dB Bandwidth BWLS CONDITIONS MIN TYP RL = 1kΩ 185 RL = 150Ω 145 RL = 1kΩ 0.1 RL = 150Ω 0.1 RL = 1kΩ 110 RL = 150Ω 65 VOUT = 2Vp-p Slew Rate SR VOUT step, OUT = 2V step RL = 150Ω Settling Time to 0.1% tS VOUT = 2V step Positive slew 300 V/µs Negative slew 230 V/µs 20 ns fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ 66 RL = 150Ω 56 Second Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -76 RL = 150Ω -59 Third Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -66 RL = 150Ω -56 RL = 1kΩ 0.06 RL = 150Ω 0.34 RL = 1kΩ 0.02 RL = 150Ω 0.05 Differential Phase Error DP NTSC Differential Gain Error DG NTSC Input Noise Voltage Density en f = 10kHz Input Noise Current Density in f = 10kHz ZOUT f = 10MHz MHz 80 9 SFDR dB RL = 150Ω Fall time Spurious-Free Dynamic Range MHz 80 8 VOUT = 2V step UNITS RL = 1kΩ Rise time Rise/Fall Time MAX 2 Positive input 4 Negative input 5 MHz ns dB dBc dBc degrees % nV/√Hz pA/√Hz 4 Ω Crosstalk f = 10MHz, input referred -55 dB All Hostile Off Isolation f = 10MHz, input referred -65 dB Output Impedance Gain Matching to 0.1dB 40 MHz 120 ns ns Amplifier Enable Time tON Delay from DISABLE to 90% of VOUT, VIN = 3V Amplifier Disable Time tOFF Delay from DISABLE to 10% of VOUT, VIN = 3V 35 Positive transient 30 Negative transient 15 Disable/Enable Switching Transient mV _______________________________________________________________________________________ 7 MAX4188/MAX4189/MAX4190 AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4188) MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable AC ELECTRICAL CHARACTERISTICS—Single Supply (MAX4189) (VCC = +5V, VEE = 0, VIN = 2.5V, DISABLE_ ≥ 3V, RL to VCC / 2, AV = +1V/V, RF = 1500Ω for RL = 1kΩ and RF = 1600Ω for RL = 150Ω; TA = +25°C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth SYMBOL BW-3dB Peaking Bandwidth for 0.1dB Flatness BW0.1dB Large-Signal -3dB Bandwidth BWLS CONDITIONS MIN TYP RL = 1kΩ 230 RL = 150Ω 190 RL = 1kΩ 1.4 RL = 150Ω 0.15 RL = 1kΩ 7 RL = 150Ω 40 VOUT = 2Vp-p Slew Rate SR VOUT = 2V step, RL = 150Ω Settling Time to 0.1% tS VOUT = 2V step RL = 1kΩ 50 RL = 150Ω 45 Positive slew 160 Negative slew 135 25 Rise time 12 Fall time 15 fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ 57 RL = 150Ω 47 Second Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -58 RL = 150Ω -54 Third Harmonic Distortion fC = 5MHz, VOUT = 2Vp-p RL = 1kΩ -57 RL = 150Ω -47 RL = 1kΩ 0.04 RL = 150Ω 0.66 RL = 1kΩ 0.06 RL = 150Ω 0.17 Rise/Fall Time Spurious-Free Dynamic Range VOUT = 2V step SFDR Differential Phase Error DP NTSC Differential Gain Error DG NTSC Input Noise Voltage Density en f = 10kHz Input Noise Current Density in f = 10kHz ZOUT f = 10MHz 2 Positive input 4 Negative input 5 MAX UNITS MHz dB MHz MHz V/µs ns ns dB dBc dBc degrees % nV/√Hz pA/√Hz 4 Ω Crosstalk f = 10MHz, input referred -57 dB All Hostile Off Isolation f = 10MHz, input referred -55 dB Output Impedance Gain Matching to 0.1dB Amplifier Enable Time tON Delay from DISABLE to 90% of VOUT, VIN = 3V Amplifier Disable Time tOFF Delay from DISABLE to 10% of VOUT, VIN = 3V Disable/Enable Switching Transient 25 MHz 120 ns 40 ns Positive transient 70 Negative transient 110 Note 1: Input Offset Voltage does not include the effect of IBIAS flowing through RF/RG. Note 2: Does not include current through external feedback network. Note 3: Over operating supply-voltage range. 8 _______________________________________________________________________________________ mV Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable (V CC = +5V, V EE = 0, V IN = 0, A V = +2V/V; R F = R G = 1500Ω for R L = 1kΩ and R F = R G = 750Ω for R L = 150Ω, TA = +25°C, unless otherwise noted) PARAMETER Small-Signal -3dB Bandwidth SYMBOL BW-3dB Peaking Bandwidth for 0.1dB Flatness BW0.1dB Large-Signal -3dB Bandwidth BWLS CONDITIONS MIN TYP RL = 1kΩ 165 RL = 150Ω 135 RL = 1kΩ 0.1 RL = 150Ω 0.1 RL = 1kΩ 70 RL = 150Ω 65 VO = 2Vp-p RL = 1kΩ 75 RL = 150Ω 75 Positive slew 290 Negative slew 220 SR VO = 2V step, RL = 150Ω Settling Time to 0.1% tS VO = 2V step Rise/Fall Time tR tF VO = 2V step, RL = 150Ω Rise time 8 Fall time 9 Spurious-Free Dynamic Range fC = 5MHz, VO = 2Vp-p RL = 1kΩ 59 RL = 150Ω 55 Second Harmonic Distortion fC = 5MHz, VO = 2Vp-p RL = 1kΩ -59 RL = 150Ω -55 Third Harmonic Distortion fC = 5MHz, VO = 2Vp-p RL = 1kΩ -68 RL = 150Ω -60 RL = 1kΩ 0.02 RL = 150Ω 0.08 RL = 1kΩ 0.07 RL = 150Ω 0.43 Slew Rate Differential Gain Error DG NTSC Differential Phase Error DP NTSC Input Noise Voltage Density Input Noise Current Density Output Impedance f = 10kHz in f = 10kHz ZOUT f = 10MHz All Hostile Off Isolation 2 Positive input 4 Negative input 5 f = 10MHz, input referred, RL = 150Ω Turn-On Time from DISABLE tON Turn-Off Time from DISABLE tOFF Disable/Enable Switching Transient 20 BWLS MAX UNITS MHz dB MHz MHz V/µs ns ns dB dBc dBc % degrees nV/√Hz pA/√Hz 4 Ω -60 dB 120 ns 35 ns Positive transient 30 Negative transient 15 mV _______________________________________________________________________________________ 9 MAX4188/MAX4189/MAX4190 AC & DYNAMIC PERFORMANCE—Single Supply (MAX4190) __________________________________________Typical Operating Characteristics (VCC = +5V, VEE = -5V, TA = +25°C, unless otherwise noted.) MAX4188 SMALL-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY) 6 5 RF = RG = 390Ω RL = 100Ω 4 VEE = 0V VIN = 20mVp-p AV = +2V/V 10 100 -0.2 -0.6 1 10 100 1000 1 MAX4189 SMALL-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY) MAX4189 GAIN FLATNESS vs. FREQUENCY (DUAL SUPPLIES) RF = 1.5kΩ RL = 1kΩ 3 2 0.2 MAX4188toc05 4 MAX4188toc04 RF = 1.6kΩ RL = 1kΩ 0 0 -0.2 -2 -4 -5 100 -0.3 -0.4 -0.6 VIN = 20mVp-p AV = +1V/V -0.7 10 100 1000 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX4188 LARGE-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES) MAX4188 LARGE-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY) MAX4188 SMALL-SIGNAL GAIN MATCHING vs. FREQUENCY 8 RF = RG = 560Ω RL = 150Ω 6 8 RF = RG = 620Ω RL = 150Ω 7 GAIN (dB) 7 9 5 RF = RG = 910Ω RL = 1kΩ 6 5 RF = RG = 1.1kΩ RL = 1kΩ 4 3 VEE = 0 VIN = 1Vp-p AV = +2V/V 2 2 VIN = 1Vp-p AV = +2V/V 1 10 100 FREQUENCY (MHz) 1000 1.5 1000 CH1-CH3 1.0 0.5 0 -0.5 CH2-CH3 -1.0 VIN = 20mVp-p RF = RG = 750Ω RL = 1kΩ AV = +2V/V -1.5 -2.0 0 0 2.0 GAIN MATCHING (dB) 9 2.5 MAX4188toc08 10 MAX4188toc07 10 1 RF = 680Ω RL = 100Ω -0.8 1 1000 1000 -0.5 RF = 910Ω RL = 100Ω -6 -6 10 VEE = 0 VIN = 20mVp-p AV = +1V/V -4 VIN = 20mVp-p AV = +1V/V 1 RF = 1.6kΩ RL = 150Ω -2 -3 RF = 1.1kΩ RL = 150Ω -3 -1 GAIN (dB) 0 GAIN (dB) -0.1 -1 RF = 1.1kΩ RL = 150Ω 0.1 1 1 100 MAX4189 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES) 1 3 10 FREQUENCY (MHz) RF = 680Ω RL = 100Ω 4 VIN = 20mVp-p AV = +2V/V -0.5 FREQUENCY (MHz) 4 -5 RF = RG = 390Ω RL = 100Ω FREQUENCY (MHz) 3 2 1000 RF = RG = 620Ω RL = 150Ω -0.4 0 1 0 -0.1 -0.3 1 0 GAIN (dB) RF = RG = 620Ω RL = 150Ω 2 VIN = 20mVp-p AV = +2V/V 1 0.1 3 2 10 5 0.2 RF = RG = 1.1kΩ RL = 1kΩ MAX4188toc06 3 6 RF = RG = 910Ω RL = 1kΩ 0.3 MAX4188toc09 4 RF = RG = 430Ω RL = 100Ω 7 GAIN (dB) GAIN (dB) 7 9 8 0.4 MAX4188toc02 RF = RG = 910kΩ RF = RG = 560Ω R = 1kΩ L RL = 150Ω 8 10 GAIN (dB) 9 MAX4188toc01 10 MAX4188 GAIN FLATNESS vs. FREQUENCY (DUAL SUPPLIES) MAX4188toc03 MAX4188 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES) GAIN (dB) MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable CH1-CH2 -2.5 1 10 100 FREQUENCY (MHz) 1000 1 10 100 FREQUENCY (MHz) ______________________________________________________________________________________ 1000 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable 3 0 RF = 1.1kΩ RL = 150Ω 0.5 -4 VIN = 2Vp-p AV = 1V/V -5 10 100 1000 1 10 100 1000 1 100 MAX4188 CROSSTALK vs. FREQUENCY (DUAL SUPPLIES) -10 VOUT = 2Vp-p -20 -40 3RD (RL = 150Ω) -50 2ND (RL = 150Ω) -70 -70 -80 -90 3RD (RL = 1kΩ) -100 -100 0.1 1 10 0.1 100 -40 -50 -70 -90 2ND (RL = 1kΩ) -30 -60 2ND (RL = 1kΩ) -80 3RD (RL = 1kΩ) -80 1 10 100 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX4189 HARMONIC DISTORTION vs. FREQUENCY (DUAL SUPPLIES) MAX4189 HARMONIC DISTORTION vs. FREQUENCY (SINGLE SUPPLY) MAX4189 CROSSTALK vs. FREQUENCY (DUAL SUPPLIES) -20 3RD (RL = 150Ω) 2ND (RL = 150Ω) -70 VOUT = 2Vp-p -20 DISTORTION (dBc) -30 -10 3RD (RL = 150Ω) -40 2ND (RL = 150Ω) -60 2ND (RL = 1kΩ) -70 -80 -90 3RD (RL = 1kΩ) -90 3RD (RL = 1kΩ) -100 10 FREQUENCY (MHz) 100 -40 -50 -70 -80 -100 1 -30 -60 -80 2ND (RL = 1kΩ) VOUT = 2Vp-p RL = 150Ω -10 1000 -20 -30 -50 0 CROSSTALK (dBc) VOUT = 2Vp-p MAX4188toc17 0 MAX4188toc16 0 1000 -20 -30 -60 VOUT = 2Vp-p RL = 150Ω -10 CROSSTALK (dBc) DISTORTION (dBc) 2ND (RL = 150Ω) 0 MAX4188toc14 0 MAX4188toc13 3RD (RL = 150Ω) 0.1 10 MAX4188 HARMONIC DISTORTION vs. FREQUENCY (SINGLE SUPPLY) -50 -60 -2.5 MAX4188 HARMONIC DISTORTION vs. FREQUENCY (DUAL SUPPLIES) -40 -50 -2.0 CH_3–CH_2 FREQUENCY (MHz) VOUT = 2Vp-p -40 VIN = 2Vp-p RF = 1.6kΩ RL = 1kΩ AV = +1V/V -1.5 FREQUENCY (MHz) -30 -10 0 -0.5 FREQUENCY (MHz) -20 -60 CH_1–CH_3 CH_1–CH_2 -1.0 VEE = 0 VIN = 2Vp-p AV = +1V/V -6 0 -10 RF = 1.6kΩ RL = 150Ω -2 -3 1 DISTORTION (dBc) 0 -1 -4 -6 DISTORTION (dBc) 1.0 -3 -5 1.5 1 MAX4188toc15 -2 2.0 MAX4188toc18 -1 GAIN (dB) RF = 1.6kΩ RL = 1kΩ 1 RF = 1.5kΩ RL = 1kΩ 2 2.5 MAX4188toc11 2 MAX4189 SMALL-SIGNAL GAIN MATCHING vs. FREQUENCY GAIN (dB) 3 GAIN (dB) 4 MAX4188toc10 4 MAX4189 LARGE-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY) MAX4188toc12 MAX4189 LARGE-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES) 0.1 1 10 FREQUENCY (MHz) 100 1 10 100 1000 FREQUENCY (MHz) ______________________________________________________________________________________ 11 MAX4188/MAX4189/MAX4190 ____________________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, TA = +25°C, unless otherwise noted.) ____________________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, TA = +25°C, unless otherwise noted.) TOTAL VOLTAGE-NOISE DENSITY vs. FREQUENCY (INPUT REFERRED) 2.6 2.4 2.2 2.0 1.8 1.6 MAX4188 20 16 910k 910k 12 200 150 10k 100k 1M 10M 100M 1G 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY (DUAL SUPPLIES) OUTPUT IMPEDANCE (Ω) -30 VCC (MAX4189) -50 VEE (MAX4189) -60 -70 VEE (MAX4188) 10 MAX4189 MAX4188 1 -80 -90 1 10 100 0.1 1 FREQUENCY (MHz) 10 100 INPUT BIAS CURRENT (µA) 1.4 1.2 1.0 0.8 0.6 3 IB - (POSITIVE INPUT) 2 IB - (NEGATIVE INPUT) 0.2 0 0 40 TEMPERATURE (°C) -20 60 80 -40 -20 0 20 40 TEMPERATURE (°C) 0 20 40 60 80 DISABLED SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE 4 1 0.4 20 -40 TEMPERATURE (°C) MAX4188toc26 1.6 0 1.3 1000 5 MAX4188toc25 1.8 -20 VCC = 5V; VEE = 0 1.4 INPUT BIAS CURRENT vs. TEMPERATURE INPUT OFFSET VOLTAGE (VOS) vs. TEMPERATURE -40 VCC = 5V; VEE = -5V 1.5 FREQUENCY (MHz) 2.0 2 1.2 1000 60 80 DISABLED SUPPLY CURRENT PER AMPLIFIER (mA) 0.1 1 1.6 0.1 -100 0.1 SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE RL = 1kΩ, AV = +2V/V, RF = RG = 910Ω FOR MAX4188; AV = +1 V/V, RF = 1.6kΩ FOR MAX4189 100 0.02 INPUT AMPLITUDE (Vp-p) MAX4188-23 VCC (MAX4188) -20 1G 1k MAX4188toc22 0 -40 0 100 FREQUENCY (Hz) -10 DUAL SUPPLIES: RL = 1kΩ, AV = +2V/V, RF = RG = 910Ω FOR MAX4188; AV = +1V/V, RF = 1.6kΩ FOR MAX4189 100 50 SUPPLY CURRENT PER AMPLIFIER (mA) 1k MAX4188toc21 MAX4188 250 4 100 12 MAX4189 300 8 1.4 PSRR (dB) VOUT 24 350 MAX4188toc24 2.8 VIN 0.5 MAX4188toc27 3.0 28 -3dB BANDWIDTH (MHz) 3.2 TOTAL VOLTAGE-NOISE DENSITY (nV/√Hz) MAX4180 TOC19 VOLTAGE-NOISE DENSITY (nV/√Hz) 3.4 -3dB BANDWIDTH vs. INPUT AMPLITUDE MAX4188toc20 INPUT VOLTAGE-NOISE DENSITY vs. FREQUENCY VOS (mV) MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable VCC = ±5V 0.4 VCC = ±2.5V 0.3 0.2 -40 -20 0 20 40 TEMPERATURE (°C) ______________________________________________________________________________________ 60 80 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable MAX4188 ENABLE/DISABLE RESPONSE (VCC-VOH) AND (VOL-VEE) (mV) VOL - VEE; RL = 150Ω 1.6 1.4 4V MAX4188toc30 MAX4188toc28 1.8 MAX4189 POWER-ON RESPONSE MAX4188toc29 OUTPUT VOLTAGE SWING vs. TEMPERATURE 10V DISABLE VCC 0V 0V 2V VOUT OUT 2V/div 0V 0V VCC - VOH; RL = 150Ω 1.2 VOL - VEE; RL = 1kΩ 1.0 VCC - VOH; RL = 1kΩ -20 0 20 40 60 50ns/div AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ, VIN = 1V 80 TEMPERATURE (°C) MAX4188 SMALL-SIGNAL PULSE RESPONSE (WITH CLOAD) MAX4188toc31 MAX4188 SMALL-SIGNAL PULSE RESPONSE +25mV IN +25mV MAX4188 LARGE-SIGNAL PULSE RESPONSE +1V IN IN -25mV 200ns/div AV = +1V/V, RL = 1kΩ, RF = 1.6kΩ, VEE = 0 MAX4188toc32 -40 -1V -25mV +50mV +50mV +2V OUT OUT OUT -50mV -50mV -2V 10ns/div AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ MAX4188toc33 0.8 10ns/div AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ, CL = 47pF 10ns/div AV = +2V/V, RF = RG = 910Ω, RL = 1kΩ ______________________________________________________________________________________ 13 MAX4188/MAX4189/MAX4190 ____________________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, TA = +25°C, unless otherwise noted.) ____________________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, TA = +25°C, unless otherwise noted.) MAX4189 SMALL-SIGNAL PULSE RESPONSE (WITH CLOAD) +2V IN IN -50mV -50mV -2V +50mV +50mV +2V OUT OUT OUT -50mV -50mV -2V 10ns/div AV = +1V/V, RF = 1.1kΩ, RL = 150Ω MAX4189 SWITCHING TRANSIENT MAX4188toc38 3V DISABLE 0V 0V OUT OUT 100mV/div 0V 20mV/div 100ns/div AV = +2V/V, RF = 910Ω, RL = 1kΩ, VIN = 0 14 OFF-CHANNEL FEEDTHROUGH vs. FREQUENCY (DUAL SUPPLIES) 100ns/div AV = +1V/V, RF = 1.6kΩ, RL = 1kΩ, VIN = 0 -25 RL = 150Ω OFF-CHANNEL FEEDTHROUGH (dB) DISABLE 10ns/div AV = +1V/V, RF = 1.1kΩ, RL = 150Ω 10ns/div AV = +1V/V, RF = 1.6kΩ, RL = 1kΩ, CL = 47pF MAX4188 SWITCHING TRANSIENT 3V MAX4188toc36 +50mV IN MAX4188toc39 +50mV MAX4189 LARGE-SIGNAL PULSE RESPONSE MAX4188toc35 MAX4188toc34 MAX4189 SMALL-SIGNAL PULSE RESPONSE MAX4188toc37 MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable -35 -45 -55 -65 -75 -85 -95 1 10 100 FREQUENCY (MHz) ______________________________________________________________________________________ 1000 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable PIN MAX4188/MAX4189 MAX4190 NAME FUNCTION SO QSOP SO/µMAX 1 1 — DISABLE1 Disable Control Input for Amplifier 1. Amplifier 1 is enabled when DISABLE1 ≥ (VCC - 2V) and disabled when DISABLE1 ≤ (VCC - 3V). 2 2 — DISABLE2 Disable Control Input for Amplifier 2. Amplifier 2 is enabled when DISABLE2 ≥ (VCC - 2V) and disabled when DISABLE2 ≤ (VCC - 3V). 3 3 — DISABLE3 Disable Control Input for Amplifier 3. Amplifier 3 is enabled when DISABLE3 ≥ (VCC - 2V) and disabled when DISABLE3 ≤ (VCC - 3V). 4 4 7 VCC Positive Power Supply. Connect VCC to +5V. 5 5 — IN1+ Amplifier 1 Noninverting Input 6 6 — IN1- Amplifier 1 Inverting Input 7 7 — OUT1 — 8, 9 1, 5 N.C. 8 10 — OUT3 9 11 — IN3- Amplifier 3 Inverting Input 10 12 — IN3+ Amplifier 3 Noninverting Input 11 13 4 VEE Negative Power Supply. Connect VEE to -5V or to ground for single-supply operation. 12 14 — IN2+ Amplifier 2 Noninverting Input 13 15 — IN2- Amplifier 2 Inverting Input 14 16 — OUT2 — — 2 IN- Amplifier Inverting Input — — 3 IN+ Amplifier Noninverting Input — — 6 OUT Amplifier Output — — 8 DISABLE Amplifier 1 Output No Connect. Not internally connected. Amplifier 3 Output Amplifier 2 Output Disable Control Input. Amplifier is enabled when DISABLE ≥ (VCC - 2V) and disabled when DISABLE ≤ (VCC - 3V). Detailed Description The MAX4188/MAX4189/MAX4190 are very low-power, current-feedback amplifiers featuring bandwidths up to 250MHz, 0.1dB gain flatness to 80MHz, and low differential gain (0.03%) and phase (0.05°) errors. These amplifiers achieve very high bandwidth-to-power ratios while maintaining low distortion, wide signal swing, and excellent load-driving capabilities. They are optimized for ±5V supplies but are also fully specified for single +5V operation. Consuming only 1.5mA per amplifier, these devices have ±55mA output current drive capability and achieve low distortion even while driving 150Ω loads. Wide bandwidth, low power, low differential phase/gain error, and excellent gain flatness make the MAX4188 family ideal for use in portable video equipment such as video cameras, video switchers, and other batterypowered equipment. Their two-stage design provides higher gain and lower distortion than conventional single-stage, current-feedback amplifiers. This feature, combined with a fast settling time, makes these devices suitable for buffering high-speed analog-to-digital converters. The MAX4188/MAX4189/MAX4190 have a high-speed, low-power disable mode that is activated by driving the amplifiers’ DISABLE input low. In the disable mode, the ______________________________________________________________________________________ 15 MAX4188/MAX4189/MAX4190 Pin Descriptions MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable amplifiers achieve very high isolation from input to output (65dB at 10MHz), and the outputs are placed into a highimpedance state. These amplifiers achieve low switching-transient glitches (<45mVp-p) when switching between enable and disable modes. Fast enable/disable times (120ns/35ns), along with high off-isolation and low switching transients, allow these devices to be used as high-performance, high-speed multiplexers. This is achieved by connecting the outputs of multiple amplifiers together and controlling the DISABLE inputs to enable one amplifier and disable all others. The disabled amplifiers present a very light load (1µA leakage current and 3.5pF capacitance) to the active amplifier’s output. The feedback network impedance of all the disabled amplifiers must still be considered when calculating the total load on the active amplifier output. Figure 1 shows an application circuit using the MAX4188 as a 3:1 video multiplexer. The DISABLE_ logic threshold is typically VCC - 2.5V, independent of VEE. For a single +5V supply or dual ±5V supplies, the disable inputs are CMOS-logic compatible. The amplifiers default to the enabled mode if the DISABLE pin is left unconnected. If the DISABLE pin is left floating, take proper care to ensure that no high-frequency signals are coupled to this pin, as this may cause false triggering. +5V 1.0µF 0.1µF 0.1µF 4 560Ω 11 560Ω 6 7 AMP1 87Ω 75Ω MAX4188 560Ω 560Ω 13 12 VIN2 VOUT 87Ω 75Ω 75Ω 560Ω 560Ω 9 8 AMP3 10 VIN3 87Ω 75Ω 1 2 3 DISABLE1 DISABLE2 DISABLE3 Figure 1. High-Speed 3:1 Video Multiplexer RG VOUT / VIN = G x [(TZ (S) / TZ(s) + G x (RIN + RF)] where G = AVCL = 1 + (RF / RG), and RIN = 1/gM ≅ 300Ω. At low gains, G x RIN < RF. Therefore, the closed-loop bandwidth is essentially independent of closed-loop gain. Similarly TZ > RF at low frequencies, so that: RF RIN +1 +1 VOUT TZ VIN Figure 2. Current-Feedback Amplifier 16 75Ω CABLE 14 AMP2 Theory of Operation VOUT = G = 1 + (RF / RG ) VIN 1.0µF 5 VIN1 Applications Information The MAX4188/MAX4189/MAX4190 are current-feedback amplifiers, and their open-loop transfer function is expressed as a transimpedance, ∆VOUT/∆IIN, or TZ. The frequency behavior of the open-loop transimpedance is similar to the open-loop gain of a voltage-mode 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 2, yields the following transfer function: -5V ______________________________________________________________________________________ MAX4188 MAX4189 MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable The MAX4188/MAX4189/MAX4190 achieve a high degree of off-isolation (65dB at 10MHz) and low crosstalk (-55dB at 10MHz). The input and output signal traces must be kept from overlapping to achieve high off-isolation. Coupling between the signal traces of different channels will degrade crosstalk. The signal traces of each channel should be kept from overlapping with the signal traces of the other channels. Adequate bypass capacitance at each supply is very important to optimize the high-frequency performance of these amplifiers. Inadequate bypassing will also degrade crosstalk rejection, especially with heavier loads. Use a 1µF capacitor in parallel with a 0.01µF to 0.1µF capacitor between each supply pin and ground to achieve optimum performance. The bypass capacitors should be located as close to the device as possible. A 10µF low-ESR tantalum capacitor may be required to produce the best settling time and lowest distortion when large transient currents must be delivered to a load. Choosing Feedback and Gain Resistors The optimum value of the external-feedback (RF) and gain-setting (RG) resistors used with the MAX4188/ MAX4189/MAX4190 depends on the closed-loop gain and the application circuit’s load. Table 1 lists the optimum resistor values for some specific gain configurations. One-percent resistor values are preferred to maintain consistency over a wide range of production lots. Figures 3a and 3b show the standard inverting and noninverting configurations. Note that the noninverting circuit gain (Figure 3b) is 1 plus the magnitude of the inverting closed-loop gain. Otherwise, the two circuits are identical. VIN RS RT RG RF RG RF VOUT VOUT RO RO RS VIN RT MAX4188 MAX4189 MAX4190 MAX4188 MAX4189 MAX4190 VOUT = [1+ (RF / RG)] VIN VOUT = -(RF / RG) (VIN) Figure 3a. Inverting Gain Configuration Figure 3b. Noninverting Gain Configuration ______________________________________________________________________________________ 17 MAX4188/MAX4189/MAX4190 Layout and Power-Supply Bypassing As with all wideband amplifiers, a carefully laid out printed circuit board and adequate power-supply bypassing are essential to realizing the optimum AC performance of MAX4188/MAX4189/MAX4190. The PC board should have at least two layers. Signal and power should be on one layer. A large low-impedance ground plane, as free of voids as possible, should be the other layer. With multilayer boards, locate the ground plane on a layer that incorporates no signal or power traces. Do not use wire-wrap boards or breadboards and sockets. Wire-wrap boards are too inductive. Breadboards and sockets are too capacitive. Surfacemount components have lower parasitic inductance and capacitance, and are therefore preferable to through-hole components. Keep lines as short as possible to minimize parasitic inductance, and avoid 90° turns. Round all corners. Terminate all unused amplifier inputs to ground with a 100Ω or 150Ω resistor. MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable Table 1a. MAX4188 Recommended Component Values SINGLE SUPPLY DUAL SUPPLIES AV = +5 (V/V) AV = +10 (V/V) RL = 100Ω RL = 1kΩ RL = 1kΩ RL = 1kΩ RL = 150Ω AV = +2V/V COMPONENT/ BW COMPONENT/ BW RL = 1kΩ RL = 150Ω AV = +5 V/V AV = +10 V/V RL = 100Ω RL = 1kΩ RL = 1kΩ AV = +2V/V RF (Ω) 910 560 390 470 470 1.1k 620 430 470 470 RG (Ω) 910 560 390 120 51 1.1k 620 430 120 51 -3dB BW (MHz) 200 160 145 70 30 185 145 130 70 30 Table 1b. MAX4189 Recommended Component Values DUAL SUPPLIES COMPONENT/ BW SINGLE SUPPLY AV = +1V/V AV = +1V/V RL = 1kΩ RL = 150Ω RL = 100Ω RL = 1kΩ RL = 150Ω RL = 100Ω RG (Ω) 1.6k 1.1k 680 1.5k 1.6k 910 -3dB BW (MHz) 250 210 185 230 190 165 Table 1c. MAX4190 Recommended Component Values SINGLE SUPPLY DUAL SUPPLIES AV = +5 (V/V) AV = +10 (V/V) RL = 100Ω RL = 1kΩ RL = 1kΩ RL = 1kΩ RL = 150Ω AV = +2V/V COMPONENT/ BW COMPONENT/ BW RL = 1kΩ RL = 150Ω AV = +5 V/V AV = +10 V/V RL = 100Ω RL = 1kΩ RL = 1kΩ AV = +1V/V RF (Ω) 1.3k 680 510 470 470 1.5k 750 510 470 470 RG (Ω) 1.3k 680 510 120 51 1.5k 750 510 120 51 -3dB BW (MHz) 185 180 135 70 30 165 135 125 70 30 DC and Noise Errors Several major error sources must be considered in any op amp. These apply equally to the MAX4188/ MAX4189/MAX4190. Offset-error terms are given by the equation below. Voltage and current-noise errors are root-square summed and are therefore computed separately. In Figure 4, the total output offset voltage is determined by the following factors: • The input offset voltage (VOS) times the closed-loop gain (1 = RF / RG). • The positive input bias current (I B+ ) times the source resistor (RS) (usually 50Ω or 75Ω), plus the negative input bias current (IB-) times the parallel combination of R G and R F . In current-feedback amplifiers, the input bias currents at the IN+ and INterminals do not track each other and may have opposite polarity, so there is no benefit to matching the resistance at both inputs. 18 The equation for the total DC error at the output is: VOUT = [(I ( )( ) B + RS + IB − RF || ] R RG + VOS 1 + F R G ) RF RG IB- VOUT IB+ RS MAX4188 MAX4189 MAX4190 Figure 4. Output Offset Voltage ______________________________________________________________________________________ Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable With a 200MHz system bandwidth, this calculates to 68µVRMS (approximately 408µVp-p, choosing the sixsigma value). R en(OUT) = 1 + F x RG [(in + )RS ] + [(in − )RF || 2 RG ] + (en ) 2 Video Line Driver 2 The MAX4188/MAX4189/MAX4190 have a very low, 2nV/√Hz noise voltage. The current noise at the positive input (in+) is 4pA/√Hz, and the current noise at the inverting input is 5pA/√Hz. An example of the DC error calculations, using the MAX4188 typical data and typical operating circuit where R F = R G = 560kΩ (R F || R G =280Ω), and RS = 37.5Ω, gives the following: 1 x 10 −6 x 37.5 + 2 x 10 −6 280 VOUT = x 1+ 1 −3 + 1.5 x 10 VOUT = 4.1mV ( ) Calculating the total output noise in a similar manner yields: 2 ( ) en(OUT) = 1 + 1 4 x 10 −12 x 37.5 + 2 5 x 10 −12 x 280 + 2 x 10 −9 The MAX4188/MAX4189/MAX4190 are well suited to drive coaxial transmission lines when the cable is terminated at both ends (Figure 5). Cable frequency response can cause variations in the signal’s flatness. See Table 1 for optimum RF and RG values. Driving Capacitive Loads The MAX4188/MAX4189/MAX4190 are optimized for AC performance. Reactive loads decrease phase margin and may produce excessive ringing and oscillation. Unlike most high-speed amplifiers, the MAX4188/ MAX4189/MAX4190 are tolerant of capacitive loads up to 50pF. Capacitive loads greater than 50pF may cause ringing and oscillation. Figure 6a shows a circuit that eliminates this problem. Placing the small (usually 15Ω to 33Ω) isolation resistor, RS, before the reactive load prevents ringing and oscillation. At higher capacitive loads, the interaction of the load capacitance and isolation resistor controls AC performance. Figures 6b and 6c show the MAX4188 and MAX4189 frequency response with a 100pF capacitive load. Note that in each case, gain peaking is substantially reduced when the 20Ω resistor is used to isolate the capacitive load from the amplifier output. 2 en(OUT) = 4.8nV / Hz RG 560Ω RF 560Ω +5V MAX4188 MAX4189 MAX4190 0.1µF RG 75Ω 75Ω CABLE VIDEO IN 75Ω CABLE MAX4188 75Ω 75Ω RF RS VIDEO OUT VIN CL RL 0.1µF -5V Figure 5. Video Line Driver Application Figure 6a. Using an Isolation Resistor (RS) for High Capacitive Loads ______________________________________________________________________________________ 19 MAX4188/MAX4189/MAX4190 The total output-referred noise voltage is: 12 5 MAX4188/MAX4190 AV = +2V/V RF = RG = 910Ω RL = 1k || 100pF VIN = 20mVp-p 10 8 6 MAX4189 AV = +1V/V RF = 1.6k RL = 1k || 100pF VIN = 20mVp-p 4 3 RS = 0Ω 2 4 2 GAIN (dB) GAIN (dB) MAX4188/MAX4189/MAX4190 Single/Triple, Low-Glitch, 250MHz, CurrentFeedback Amplifiers with High-Speed Disable RS = 20Ω 0 -2 RS = 20Ω 0 RS = 33Ω -1 -2 RS = 33Ω -4 1 RS = 0Ω -3 -8 -4 -10 -5 1 10 100 1000 1 FREQUENCY (MHz) 10 100 1000 FREQUENCY (MHz) Figure 6c. Normalized Frequency Response with 100pF Capacitive Load Figure 6b. Normalized Frequency Response with 100pF Capacitive Load Ordering Information (continued) Chip Information MAX4188/4189 TRANSISTOR COUNT: 336 MAX4190 TRANSISTOR COUNT: 112 SUBSTRATE CONNECTED TO VEE PART TEMP. RANGE PIN-PACKAGE MAX4189ESD -40°C to +85°C 14 SO MAX4189EEE -40°C to +85°C 16 QSOP MAX4190ESD -40°C to +85°C 8 SO MAX4190EEE -40°C to +85°C 8 µMAX Pin Configurations TOP VIEW DISABLE1 1 15 IN2- 13 IN2- DISABLE3 3 DISABLE3 3 12 IN2+ VCC 4 11 VEE IN1+ 5 1 8 DISABLE 2 7 VCC IN+ 3 6 OUT VCC 4 VEE 4 5 N.C. IN1+ 5 MAX4188 MAX4189 10 IN3+ 14 IN2+ MAX4188 MAX4189 13 VEE 12 IN3+ IN1- 6 11 IN3- IN1- 6 9 IN3- OUT1 7 10 OUT3 OUT1 7 8 OUT3 N.C. 8 SO 20 DISABLE2 2 2 IN- SO/µMAX 16 OUT2 DISABLE2 N.C. MAX4190 DISABLE1 1 14 OUT2 9 QSOP ______________________________________________________________________________________ N.C.