19-1552; Rev 2; 8/00 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable For additional power savings, these amplifiers feature a low-power disable mode that reduces supply current and places the outputs in a high-impedance state. The MAX4265/MAX4266/MAX4267 are available in a spacesaving 8-pin µMAX package, and the MAX4268/ MAX4269/MAX4270 are available in a 16-pin QSOP package. Features ♦ Operates from +4.5V to +8.0V ♦ Superior SFDR with 100Ω Load -90dBc (fC = 5MHz ) -59dBc (fC = 100MHz) ♦ 35dBm IP3 (fC = 20MHz) ♦ 8nV/√Hz Voltage Noise Density ♦ 100MHz 0.1dB Gain Flatness (MAX4268) ♦ 900V/µs Slew Rate ♦ ±45mA Output Driving Capability ♦ Disable Mode Places Outputs in High-Impedance State Ordering Information PART MAX4265EUA MAX4265ESA MAX4266EUA MAX4266ESA MAX4267EUA TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 µMAX 8 SO 8 µMAX 8 SO -40°C to +85°C 8 µMAX MAX4267ESA -40°C to +85°C 8 SO MAX4268EEE -40°C to +85°C 16 QSOP -40°C to +85°C 14 SO High-Speed DAC Buffers MAX4268ESD MAX4269EEE -40°C to +85°C 16 QSOP RF Telecom Applications MAX4269ESD -40°C to +85°C 14 SO High-Frequency Signal Processing MAX4270EEE -40°C to +85°C 16 QSOP MAX4270ESD -40°C to +85°C 14 SO Applications Base-Station Amplifiers IF Amplifiers High-Frequency ADC Drivers Pin Configurations appear at end of data sheet. Selector Guide PART MAX4265 MAX4266 MAX4267 MAX4268 MAX4269 MAX4270 NO. OF OP AMPS 1 1 1 2 2 2 MIN GAIN (V/V) 1 2 5 1 2 5 -3dB BANDWIDTH (MHz) 400 350 300 300 350 200 GBP (MHz) 400 700 1500 300 700 1000 FULL-POWER BANDWIDTH (MHz) 270 350 300 175 200 200 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX4265–MAX4270 General Description The MAX4265–MAX4270 ultra-low distortion, voltage-feedback op amps are capable of driving a 100Ω load while maintaining ultra-low distortion over a wide bandwidth. They offer superior spurious-free dynamic range (SFDR) performance: -90dBc at 5MHz and -59dBc at 100MHz (MAX4269). Additionally, input voltage noise density is 8nV/√Hz while operating from a single +4.5V to +8.0V supply or from dual ±2.25V to ±4.0V supplies. These features make the MAX4265–MAX4270 ideal for use in high-performance communications and signal-processing applications that require low distortion and wide bandwidth. The MAX4265 single and MAX4268 dual amplifiers are unity-gain stable. The MAX4266 single and MAX4269 dual amplifiers are compensated for a minimum stable gain of +2V/V, while the MAX4267 single and MAX4270 dual amplifiers are compensated for a minimum stable gain of +5V/V. MAX4265–MAX4270 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE)...............................................+8.5V Voltage on Any Other Pin .................(VEE - 0.3V) to (VCC + 0.3V) Short-Circuit Duration (VOUT to VCC or VEE) ..............Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.10mW/°C above +70°C) ..........330mW 16-Pin QSOP (derate 8.33mW/°C above +70°C)........667mW 8-Pin SO (derate 5.9mW/°C above +70°C).................471mW 14-Pin SO (derate 8.33mW/°C above +70°C).............667mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+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 (VCC = +5V, VEE = 0, RL = 100Ω to VCC/2, VCM = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 8.0 V Operating Supply Voltage Range VCC Inferred from PSRR test 4.5 Common-Mode Input Voltage VCM Inferred from CMRR test VEE + 1.6 Input Offset Voltage VOS 1 TCVOS 1.5 µV/°C 1 mV Input Offset Voltage Drift Input Offset Voltage Channel Matching Input Bias Current Input Offset Current MAX4268/MAX4269/MAX4270 VCC - 1.6 9 V mV IB 3.5 40 µA IOS 0.1 6 µA Common-Mode Input Resistance RINCM Either input (VEE + 1.6V) ≤ VCM ≤ (VCC - 1.6V) 1 MΩ Differential Input Resistance RINDIFF -10mV ≤ VIN ≤ 10mV 40 kΩ Common-Mode Rejection Ratio CMRR (VEE + 1.6V) ≤ VCM ≤ (VCC - 1.6V), no load 60 85 dB Power-Supply Rejection Ratio PSRR VCC = 4.5V to 8.0V 60 85 dB 1.75V ≤ VOUT ≤ 3.25V 60 95 dB ±30 ±45 mA 100 mA Open-Loop Voltage Gain AOL Output Voltage Swing VOUT VCC - VOH, VOL - VEE Output Current Drive IOUT RL = 20Ω Output Short-Circuit Current Closed-Loop Output Resistance Power-Up Time Quiescent Supply Current (per amplifier) Disable Output Leakage Current ISC 1.1 Sinking or sourcing to VCC or VEE IS V 0.035 Ω VOUT = 1V step, 0.1% settling time 10 µs Normal mode, DISABLE_ = VCC or floating 28 32 Disable mode, DISABLE_ = VEE 1.6 5 mA mA DISABLE_ = VEE, VEE ≤ VOUT ≤ VCC 0.2 2.5 µA ROUT tPWRUP 1.5 VCC - 3.5 DISABLE_ Logic Low VCC - 1.5 DISABLE_ Logic High V V DISABLE_ Logic Input Low Current DISABLE_ = VEE 5 100 µA DISABLE_ Logic Input High Current DISABLE_ = VCC 1 30 µA 2 _______________________________________________________________________________________ Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable (VCC = +5V, VEE = 0, RL = 100Ω to VCC/2, VCM = VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Small-Signal -3dB Bandwidth Full-Power Bandwidth 0.1dB Gain Flatness SYMBOL BW-3dB FPBW BW0.1dB CONDITIONS VOUT = 100mVp-p VOUT = 1Vp-p VOUT = 100mVp-p TYP 400 MAX4266 350 MAX4267 300 MAX4268 300 MAX4269 350 MAX4270 200 MAX4265 270 MAX4266 350 MAX4267 300 MAX4268 175 MAX4269 200 MAX4270 200 MAX4265 80 MAX4266 30 MAX4267 55 MAX4268 100 MAX4269 35 MAX4270 All-Hostile Crosstalk MIN MAX4265 MAX UNITS MHz MHz MHz 35 f = 10MHz 85 dB SR VOUT = +1V step 900 V/µs Rise/Fall Times t R , tF VOUT = +1V step 1 ns Settling Time (0.1%) tS,0.1 VOUT = +1V step 15 ns Slew Rate fC = 1MHz VOUT = 1Vp-p (MAX4265/ MAX4266/ MAX4267) Spurious-Free Dynamic Range SFDR VOUT = 1Vp-p (MAX4268) 83 fC = 5MHz 85 fC = 10MHz 87 fC = 20MHz 81 fC = 60MHz 50 fC = 100MHz 47 fC = 1MHz 85 fC = 5MHz 85 fC = 10MHz 84 fC = 20MHz 79 fC = 60MHz 68 fC = 100MHz 60 dBc _______________________________________________________________________________________ 3 MAX4265–MAX4270 AC ELECTRICAL CHARACTERISTICS MAX4265–MAX4270 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V, VEE = 0, RL = 100Ω to VCC/2, VCM = VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS fC = 1MHz VOUT = 1Vp-p (MAX4269) Spurious-Free Dynamic Range SFDR VOUT = 1Vp-p (MAX4270) VOUT = 1Vp-p (MAX4265/ MAX4266/ MAX4267) VOUT = 1Vp-p (MAX4268) Second Harmonic Distortion VOUT = 1Vp-p (MAX4269) VOUT = 1Vp-p (MAX4270) 4 MIN TYP MAX UNITS 88 fC = 5MHz 90 fC = 10MHz 88 fC = 20MHz 79 fC = 60MHz 68 fC = 100MHz 59 fC = 1MHz 86 fC = 5MHz 81 fC = 10MHz 75 fC = 20MHz 68 fC = 60MHz 60 fC = 100MHz 56 fC = 1MHz 83 fC = 5MHz 85 fC = 10MHz 87 fC = 20MHz 81 fC = 60MHz 50 fC = 100MHz fC = 1MHz 47 85 fC = 5MHz 85 fC = 10MHz 84 fC = 20MHz 79 fC = 60MHz 68 fC = 100MHz 60 fC = 1MHz 88 fC = 5MHz 90 fC = 10MHz 88 fC = 20MHz 79 fC = 60MHz 68 fC = 100MHz 59 fC = 1MHz 86 fC = 5MHz 81 fC = 10MHz 75 fC = 20MHz 68 fC = 60MHz 60 fC = 100MHz 56 _______________________________________________________________________________________ dBc dBc Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable (VCC = +5V, VEE = 0, RL = 100Ω to VCC/2, VCM = VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS fC = 1MHz VOUT = 1Vp-p (MAX4265/ MAX4266/ MAX4267) VOUT = 1Vp-p (MAX4268) Third Harmonic Distortion VOUT = 1Vp-p (MAX4269) VOUT = 1Vp-p (MAX4270) Two-Tone, Third-Order Intercept Distortion IP3 VOUT = 1Vp-p, fCA = 20MHz, fCB = 21.25MHz MIN TYP MAX UNITS 98 fC = 5MHz 96 fC = 10MHz 91 fC = 20MHz 85 fC = 60MHz 75 fC = 100MHz 61 fC = 1MHz 95 fC = 5MHz 95 fC = 10MHz 93 fC = 20MHz 86 fC = 60MHz 72 fC = 100MHz 64 fC = 1MHz 88 fC = 5MHz 90 fC = 10MHz 88 fC = 20MHz 79 fC = 60MHz 68 fC = 100MHz 59 fC = 1MHz 96 fC = 5MHz 97 fC = 10MHz 91 fC = 20MHz 84 fC = 60MHz 74 fC = 100MHz 69 MAX4265/MAX4268 32 MAX4266/MAX4269 35 MAX4267/MAX4270 35 dBc dBm _______________________________________________________________________________________ 5 MAX4265–MAX4270 AC ELECTRICAL CHARACTERISTICS (continued) AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V, VEE = 0, RL = 100Ω to VCC/2, VCM = VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Input -1dB Compression Point CONDITIONS MIN TYP fC = 20MHz MAX UNITS 12 dBm Differential Gain DG NTSC, f = 3.58MHz, RL = 150Ω to VCC/2 0.015 % Differential Phase DP NTSC, f = 3.58MHz, RL = 150Ω to VCC/2 0.03 degrees 2 pF Input Capacitance CIN Output Impedance ROUT Disabled Output Capacitance f = 10MHz 1 Ω DISABLE_ = VEE 5 pF 100 ns 750 µs Enable Time tEN VIN = +1V Disable Time tDIS VIN = +1V No sustained oscillation Capacitive Load Stability MAX4265/MAX4268 15 MAX4266/MAX4269 15 MAX4267/MAX4270 22 pF Input Voltage Noise Density en f = 1kHz 8 nV/√Hz Input Current Noise Density in f = 1kHz 1 pA/√Hz Typical Operating Characteristics (VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100Ω to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA = +25°C, unless otherwise noted.) MAX4268/MAX4269/MAX4270 LARGE-SIGNAL GAIN vs. FREQUENCY 2 3 GAIN (dB) MAX4269 -2 -3 MAX4270 -4 0.4 0.3 0.2 MAX4268 1 0 -1 VOUT = 1Vp-p 2 MAX4268 1 0.1 0 -1 MAX4269 -2 MAX4270 -0.2 -3 -0.3 -0.4 -5 -0.5 -6 -6 10M FREQUENCY (Hz) 100M 1G MAX4269 -0.1 -4 1M MAX4268 0 -5 0.1M 6 4 MAX4265/70-03 VOUT = 100mVp-p GAIN (dB) 3 MAX4265/70-01 4 MAX4268/MAX4269/MAX4270 GAIN FLATNESS vs. FREQUENCY MAX4265/70-02 MAX4268/MAX4269/MAX4270 SMALL-SIGNAL GAIN vs. FREQUENCY GAIN (dB) MAX4265–MAX4270 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4270 -0.6 0.1M 1M 10M FREQUENCY (Hz) 100M 1G 0.1M 1M 10M FREQUENCY (Hz) _______________________________________________________________________________________ 100M 1G Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable 2 2 MAX4265 -2 MAX4266 -3 MAX4267 -5 -6 10M 100M 0 -0.1 -0.2 MAX4267 -0.3 -4 -0.4 -5 -0.5 -6 -0.6 0.1M 1G 1M 10M 100M 0.1M 1G MAX4269 DISTORTION vs. FREQUENCY VOUT = 1Vp-p -20 -30 VOUT = 1Vp-p -30 -40 2ND HARMONIC 3RD HARMONIC -100 DISTORTION (dBc) -70 -50 -60 -70 10 1 -50 -60 -70 -80 2ND HARMONIC -80 -90 3RD HARMONIC -90 100 2ND HARMONIC 3RD HARMONIC -100 -100 0.1 MAX4265/70-09 -20 DISTORTION (dBc) -60 0.1 10 1 0.1 100 10 1 100 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX4270 DISTORTION vs. FREQUENCY MAX4265/MAX4266/MAX4267 DISTORTION vs. LOAD RESISTANCE MAX4268 DISTORTION vs. LOAD RESISTANCE -30 fO = 5MHz VOUT = 1Vp-p -30 -20 -60 -70 -40 DISTORTION (dBc) DISTORTION (dBc) -50 -50 -60 -70 -80 2ND HARMONIC -90 3RD HARMONIC 1 10 FREQUENCY (MHz) 100 -50 -60 -70 2ND HARMONIC -80 3RD HARMONIC -90 -100 -100 fO = 5MHz VOUT = 1Vp-p -30 -40 -40 MAX4265/70-12 VOUT = 1Vp-p MAX4265/70-11 -20 MAX4265/70-10 -20 0.1 1G MAX4268 DISTORTION vs. FREQUENCY -50 -90 100M MAX4265/MAX4266/MAX4267 DISTORTION vs. FREQUENCY -40 -80 10M FREQUENCY (Hz) -40 -90 1M FREQUENCY (Hz) VOUT = 1Vp-p -80 MAX4267 FREQUENCY (Hz) -30 DISTORTION (dB) MAX4266 -2 MAX4265 MAX4266 0.1 MAX4265/70-08 -20 1M MAX4265/70-07 0.1M 0 -1 -3 -4 0.2 GAIN (dB) GAIN (dB) GAIN (dB) 0 -1 0.4 0.3 MAX4265 1 1 DISTORTION (dBc) VOUT = 1Vp-p 3 MAX4265/70-06 3 MAX4265/70-05 4 MAX4265/70-04 4 MAX4265/MAX4266/MAX4267 GAIN FLATNESS vs. FREQUENCY MAX4265/MAX4266/MAX4267 LARGE-SIGNAL GAIN vs. FREQUENCY MAX4265/MAX4266/MAX4267 SMALL-SIGNAL GAIN vs. FREQUENCY 2ND HARMONIC 3RD HARMONIC -100 0 100 200 300 RLOAD (Ω) 400 500 600 0 100 200 300 400 500 600 RLOAD (Ω) _______________________________________________________________________________________ 7 MAX4265–MAX4270 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100Ω to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100Ω to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25°C, unless otherwise noted.) MAX4270 DISTORTION vs. LOAD RESISTANCE -60 -70 2ND HARMONIC -80 -90 -40 DISTORTION (dBc) DISTORTION (dBc) -50 -60 -70 -80 -90 3RD HARMONIC 200 300 400 500 3RD HARMONIC -90 2ND HARMONIC 3RD HARMONIC -100 0 600 -70 100 200 300 400 500 600 0 0.5 1.5 2.0 RLOAD (Ω) RLOAD (Ω) VOLTAGE SWING (V) MAX4268 DISTORTION vs. VOLTAGE SWING MAX4269 DISTORTION vs. VOLTAGE SWING MAX4270 DISTORTION vs. VOLTAGE SWING fO = 5MHz -30 -20 fO = 5MHz -30 -20 -60 -70 -50 -60 -70 2ND HARMONIC 2ND HARMONIC -80 -80 -90 -50 -60 -70 2ND HARMONIC -80 3RD HARMONIC -90 -90 -100 -100 3RD HARMONIC 3RD HARMONIC -100 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 VOLTAGE SWING (Vp-p) VOLTAGE SWING (Vp-p) VOLTAGE SWING (Vp-p) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY SPURIOUS-FREE DYNAMIC RANGE vs. FREQUENCY TWO-TONE THIRD-ORDER INTERCEPT vs. FREQUENCY VOUT = 1Vp-p 60 -30 55 MAX4267/MAX4270 0.01 50 INTERCEPT (dBm) SFDR (dBc) -40 -50 -60 MAX4270 -70 MAX4266/MAX4269 MAX4269 -80 MAX4265/MAX4268 MAX4266/MAX4269 45 40 35 MAX4267/MAX4270 30 -90 2.5 MAX4265/70-21 VOUT = 1Vp-p MAX4265/70-20 -20 MAX4265/70-19 0.1 2.5 -40 DISTORTION (dBc) -50 fO = 5MHz -30 -40 DISTORTION (dBc) -40 0 1.0 MAX4265/70-18 -20 100 MAX4265/70-16 0 -60 -80 -100 -100 -50 2ND HARMONIC MAX4265/70-17 DISTORTION (dBc) -50 fO = 5MHz -30 -40 -40 DISTORTION (dBc) fO = 5MHz VOUT = 1Vp-p -30 -20 MAX4265/70-14 fO = 5MHz VOUT = 1Vp-p -30 -20 MAX4265/70-13 -20 MAX4265/MAX4266/MAX4267 DISTORTION vs. VOLTAGE SWING MAX4265/70-15 MAX4269 DISTORTION vs. LOAD RESISTANCE THD + NOISE (%) MAX4265–MAX4270 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265/MAX4268 25 MAX4268 0.001 -100 0.1 1 10 FREQUENCY (MHz) 8 100 20 0.1 1 10 FREQUENCY (MHz) 100 0.1 1 10 FREQUENCY (MHz) _______________________________________________________________________________________ 100 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable 10 1 -20 0.1 10 100 1k 10k 100k 1M 10M -60 -80 -120 1M 10M 100M 0.1M 1G 1M 10M 100M 1G MAX4266/MAX4269 DIFFERENTIAL GAIN AND PHASE MAX4267/MAX4270 DIFFERENTIAL GAIN AND PHASE 0.020 0.015 0.010 0.005 0.000 -0.005 10 IRE 0.020 0.010 0.000 -0.010 -0.020 -0.030 10 100 IRE MAX4265/70-27 MAX4265/MAX4268 DIFFERENTIAL GAIN AND PHASE DIFF GAIN (%) FREQUENCY (Hz) MAX4265/70-26 FREQUENCY (Hz) DIFF GAIN (%) FREQUENCY (Hz) MAX4265/70-25 DIFF GAIN (%) 1 -40 -100 0.01 0.1M 1 MAX4265/70-24 100 CROSSTALK (dB) OUTPUT IMPEDANCE (Ω) 10 0 MAX4265/70-23 1000 MAX4265/70-22 100 VOLTAGE NOISE (nV/√Hz) MAX4268/MAX4269/MAX4270 CROSSTALK vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY VOLTAGE NOISE vs. FREQUENCY 0.006 0.004 0.002 0.000 -0.002 -0.004 -0.006 100 10 IRE 100 10 IRE 100 IRE 0.012 0.008 0.004 0.000 -0.004 -0.008 100 10 RL = 150Ω 100 RL = 150Ω COMMON-MODE REJECTION RATIO vs. FREQUENCY -20 -10 -20 -30 CMRR (dB) -30 -40 -50 -60 -40 -50 -60 -70 -80 -70 -90 -80 -100 10M FREQUENCY (Hz) 100M 1G 4.5 VOH 4.0 3.5 3.0 2.5 2.0 1.5 1.0 VOL 0.5 -90 1M 5.0 OUTPUT VOLTAGE SWING (V) -10 OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD RESISTANCE MAX14265/70-29 0 MAX4265/70-28 0 0.1M -0.020 -0.030 RL = 150Ω POWER-SUPPLY REJECTION RATIO vs. FREQUENCY PSRR (dB) IRE 0.000 -0.010 MAX4265/70-30 10 DIFF PHASE (°) DIFF PHASE (°) DIFF PHASE (°) 0.010 0.04 0.03 0.02 0.01 0.00 -0.01 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 1G 0 200 400 600 800 1000 RLOAD (Ω) _______________________________________________________________________________________ 9 MAX4265–MAX4270 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100Ω to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100Ω to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25°C, unless otherwise noted.) POWER-UP/POWER-DOWN RESPONSE INPUT OFFSET VOLTAGE vs. SUPPLY VOLTAGE DISABLE/ENABLE RESPONSE -0.90 INPUT TO DISABLE_ 5V 0V 5V DISABLE ENABLE OUTPUT 500mV/div OUTPUT 500mV/div 0V INPUT OFFSET VOLTAGE (mV) VCC 2.5V/div MAX4265/70-32 MAX4265/70-33 MAX4265/70-31 -0.95 -1.00 -1.05 -1.10 -1.15 -1.20 5µs/div 250ns/div 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 SUPPLY VOLTAGE (V) -3.0 -2.5 -2.0 -1.5 32 31 30 29 28 -1.0 27 -0.5 26 0 25 5.0 5.5 6.0 6.5 7.0 7.5 8.0 5 4 INPUT OFFSET VOLTAGE (mV) -3.5 MAX4265/70-35 33 SUPPLY CURRENT (mA) -4.0 34 3 2 1 0 -1 -2 -3 -4 -5 4.5 5.0 5.5 6.0 6.5 7.0 7.5 -50 -35 -20 -5 8.0 10 25 40 55 70 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) TEMPERATURE (°C) INPUT BIAS CURRENT vs. TEMPERATURE INPUT OFFSET CURRENT vs. TEMPERATURE SUPPLY CURRENT (PER AMPLIFIER) vs. TEMPERATURE -3 -2 -1 300 200 100 0 -100 -200 -50 -35 -20 -5 10 25 40 TEMPERATURE (°C) 55 70 85 34 33 32 31 30 29 28 -300 27 -400 26 -500 0 35 85 MAX4265/70-39 400 SUPPLY CURRENT (mA) -4 500 MAX4265/70-38 MAX4265/70-37 -5 INPUT OFFSET CURRENT (nA) INPUT BIAS CURRENT (µA) -4.5 10 35 MAX4265/70-34 -5.0 4.5 INPUT OFFSET VOLTAGE vs. TEMPERATURE SUPPLY CURRENT (PER AMPLIFIER) vs. SUPPLY VOLTAGE MAX4265/70-36 INPUT BIAS CURRENT vs. SUPPLY VOLTAGE INPUT BIAS CURRENT (µA) MAX4265–MAX4270 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable 25 -50 -35 -20 -5 10 25 40 TEMPERATURE (°C) 55 70 85 -50 -35 -20 -5 10 25 40 TEMPERATURE (°C) ______________________________________________________________________________________ 55 70 85 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265/70-41 VOH 3 INPUT 50mV/div INPUT 25mV/div OUTPUT 50mV/div OUTPUT 50mV/div 2 1 VOL 0 -50 -35 -20 -5 10 25 40 55 70 5ns/div 85 5ns/div TEMPERATURE (°C) MAX4267/MAX4270 SMALL-SIGNAL PULSE RESPONSE MAX4265/70-44 MAX4265/70-43 MAX4265/MAX4268 LARGE-SIGNAL PULSE RESPONSE INPUT 10mV/div INPUT 500mV/div OUTPUT 50mV/div OUTPUT 500mV/div 5ns/div MAX4266/MAX4269 LARGE-SIGNAL PULSE RESPONSE MAX4267/MAX4270 LARGE-SIGNAL PULSE RESPONSE MAX4265/70-46 5ns/div MAX4265/70-45 VOLTAGE SWING (V) 4 MAX4265/70-40 5 MAX4266/MAX4269 SMALL-SIGNAL PULSE RESPONSE MAX4265/70-42 MAX4265/MAX4268 SMALL-SIGNAL PULSE RESPONSE VOLTAGE SWING vs. TEMPERATURE INPUT 250mV/div INPUT 100mV/div OUTPUT 500mV/div OUTPUT 500mV/div 5ns/div 5ns/div ______________________________________________________________________________________ 11 MAX4265–MAX4270 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100Ω to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25°C, unless otherwise noted.) MAX4265–MAX4270 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable Pin Description PIN MAX4268 MAX4269 MAX4270 MAX4265 MAX4266 MAX4267 NAME FUNCTION 8 µMAX/SO 14 SO 16 QSOP 1 — — DISABLE Disable Input. Active low. — 4, 5 4, 5 DISABLEA, DISABLEB Disable Input. Active low. 2 — — IN- Inverting Input — 2, 9 2, 11 INA-, INB- Inverting Input 3 — — IN+ Noninverting Input — 3, 10 3, 12 INA+, INB+ Noninverting Input 4, 5 6, 7 6, 7 VEE Negative Power Supply 6 — — OUT Amplifier Output — 1, 8 1, 10 OUTA, OUTB Amplifier Output 7, 8 13, 14 15, 16 VCC Positive Power Supply. Connect to a +4.5V to +8.0V supply. — 11, 12 8, 9, 13, 14 N.C. No Connection. Not internally connected. Detailed Description The MAX4265–MAX4270 family of operational amplifiers features ultra-low distortion and wide bandwidth. Their low distortion and low noise make them ideal for driving high-speed ADCs up to 16 bits in telecommunications applications and high-performance signal processing. These devices can drive a 100Ω load and deliver 45mA while maintaining DC accuracy and AC performance. The input common-mode voltage ranges from (VEE + 1.6V) to (VCC - 1.6V), while the output typically swings to within 1.1V of the rails. Low Distortion The MAX4265–MAX4270 use proprietary bipolar technology to achieve minimum distortion in low-voltage systems. This feature is typically available only in dualsupply op amps. Several factors can affect the noise and distortion that a device contributes to the input signal. The following guidelines explain how various design choices impact the total harmonic distortion (THD): 12 • Choose the proper feedback-resistor and gain-resistor values for the application. In general, the smaller the closed-loop gain, the smaller the THD generated, especially when driving heavy resistive loads. Largevalue feedback resistors can significantly improve distortion. The MAX4265–MAX4270’s THD normally increases at approximately 20dB per decade at frequencies above 1MHz; this is a lower rate than that of comparable dual-supply op amps. • Operating the device near or above the full-power bandwidth significantly degrades distortion (see the Total Harmonic Distortion vs. Frequency graph in the Typical Operating Characteristics). • The decompensated devices (MAX4266/MAX4267/ MAX4269/MAX4270) deliver the best distortion performance since they have a slightly higher slew rate and provide a higher amount of loop gain for a given closed-loop gain setting. ______________________________________________________________________________________ Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable Unity-Gain Configurations The MAX4265 and MAX4268 are internally compensated for unity gain. When configured for unity gain, they require a small resistor (RF) in series with the feedback path (Figure 1). This resistor improves AC response by reducing the Q of the tank circuit, which is formed by parasitic feedback inductance and capacitance. Inverting and Noninverting Configurations The values of the gain-setting feedback and input resistors are important design considerations. Large resistor values will increase voltage noise and interact with the amplifier’s input and PC board capacitance to generate undesirable poles and zeros, which can decrease bandwidth or cause oscillations. For example, a noninverting gain of +2V/V (Figure 1) using RF = RG = 1kΩ combined with 2pF of input capacitance and 0.5pF of board capacitance will cause a feedback pole at 128MHz. If this pole is within the anticipated amplifier bandwidth, it will jeopardize stability. Reducing the 1kΩ resistors to 100Ω extends the pole frequency to 1.28GHz, but could limit output swing by adding 200Ω in parallel with the amplifier’s load. Clearly, the selection of resistor values must be tailored to the specific application. Distortion Considerations The MAX4265–MAX4270 are ultra-low-distortion, highbandwidth op amps. Output distortion will degrade as the total load resistance seen by the amplifier decreases. To minimize distortion, keep the input and gain-setting resistor values relatively large. A 500Ω feedback resistor combined with an appropriate input resistor to set the gain will provide excellent AC performance without significantly increasing distortion. Noise Considerations The amplifier’s input-referred noise-voltage density is dominated by flicker noise at lower frequencies and by thermal noise at higher frequencies. Because the thermal noise contribution is affected by the parallel combination of the feedback resistive network, those resistor values should be reduced in cases where the system bandwidth is large and thermal noise is dominant. This noise-contribution factor decreases, however, with increasing gain settings. For example, the input noise voltage density at the op amp input with a gain of +10V/V using R F = 100kΩ and R G = 11kΩ is e n = 18nV/√Hz. The input noise can be reduced to 8nV/√Hz by choosing RF = 1kΩ, RG = 110Ω. Driving Capacitive Loads The MAX4265–MAX4270 are not designed to drive highly reactive loads. Stability is maintained with loads up to 15pF with less than 2dB peaking in the frequency response. To drive higher capacitive loads, place a small isolation resistor in series between the amplifier’s output and the capacitive load (Figure 1). This resistor improves the amplifier’s phase margin by isolating the capacitor from the op amp’s output. To ensure a load capacitance that limits peaking to less than 2dB, select a resistance value from Figure 2. For example, if the capacitive load is 100pF, the corresponding isolation resistor is 6Ω (MAX4266/MAX4269). Figures 3 and 4 show the peaking that occurs in the frequency response with and without an isolation resistor. Coaxial cable and other transmission lines are easily driven when terminated at both ends with their characteristic impedance. When driving back-terminated transmission lines, the capacitive load of the transmission line is essentially eliminated. ADC Input Buffer Input buffer amplifiers can be a source of significant errors in high-speed ADC applications. The input buffer is usually required to rapidly charge and discharge the ADC’s input, which is often capacitive (see Driving Capacitive Loads). In addition, since a high-speed ADC’s input impedance often changes very rapidly during the conversion cycle, measurement accuracy must RG RF RS* VIN CL MAX4265 MAX4266 MAX4267 PART RF (Ω) RG (Ω) GAIN (V/V) MAX4265 MAX4266 MAX4267 24 500 500 ∞ 500 125 +1 +2 +5 RL *OPTIONAL, USED TO MINIMIZE PEAKING FOR CL > 15pF. Figure 1. Noninverting Configuration ______________________________________________________________________________________ 13 MAX4265–MAX4270 Choosing Resistor Values Low-Power Disable Mode The MAX4265–MAX4270 feature an active-low disable mode that can be used to save power and place the outputs in a high-impedance state. Drive DISABLE_ with logic levels, or connect DISABLE_ to VCC for normal operation. In the dual versions (MAX4268/ MAX4269/ MAX4270), each individual op amp is disabled separately, allowing the devices to be used in a multiplex configuration. The supply current in low-power mode is reduced to 1.6mA per amplifier. Enable time is typically 100ns, and disable time is typically 750µs. 15 MAX4265/MAX4268 0 0 40 4 3 CL = 5.1pF 80 100 120 CL = 7.3pF 2 GAIN (dB) 1 0 CL = 7.3pF CL = 5.1pF 1 0 -1 CL = 2.2pF -2 CL = 2.2pF -3 -4 -4 -5 -5 0.1M 1M 10M 100M 0.1M 1G 1M Figure 3a. MAX4268 Small-Signal Gain vs. Frequency Without Isolation Resistor 5 3 4 3 CL = 15pF 2 0 1 GAIN (dB) 1 -1 -2 CL = 10pF -3 CL = 7.3pF 100M 1G Figure 3b. MAX4269 Small-Signal Gain vs. Frequency Without Isolation Resistor 4 2 10M FREQUENCY (Hz) FREQUENCY (Hz) CL = 10pF RISO = 12Ω CL = 10pF RISO = 15Ω 0 CL = 10pF RISO = 18Ω -1 -2 -4 -3 -5 -4 -5 -6 0.1M 1M 10M 100M 1G FREQUENCY (Hz) Figure 3c. MAX4270 Small-Signal Gain vs. Frequency Without Isolation Resistor 14 60 Figure 2. MAX4265–MAX4270 Isolation Resistance vs. Capacitive Load 3 -3 20 CLOAD (pF) 5 -2 MAX4267/MAX4270 5 4 -1 MAX4266/MAX4269 10 5 2 GAIN (dB) 20 RISO (Ω) be maintained using an amplifier with very low output impedance at high frequencies. The combination of high speed, fast slew rate, low noise, and a low and stable distortion overload makes the MAX4265– MAX4270 ideally suited for use as buffer amplifiers in high-speed ADC applications. GAIN (dB) MAX4265–MAX4270 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable 0.1M 1M 10M 100M 1G FREQUENCY (Hz) Figure 4a. MAX4268 Small-Signal Gain vs. Frequency With Isolation Resistor ______________________________________________________________________________________ Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable 4 4 3 3 CL = 10pF RISO = 12Ω CL = 10pF RISO = 15Ω 1 0 -1 CL = 10pF RISO = 18Ω -2 CL = 22pF RISO = 3.9Ω 1 GAIN (dB) GAIN (dB) 2 CL = 22pF RISO = 22Ω 2 0 -1 CL = 22pF RISO = 6Ω -2 -3 -3 -4 -4 -5 -5 -6 0.1M 1M 10M 100M 1G FREQUENCY (Hz) Figure 4b. MAX4269 Small-Signal Gain vs. Frequency With Isolation Resistor Power Supplies, Bypassing, and Layout The MAX4265–MAX4270 operate from a single +4.5V to +8.0V supply or in a dual-supply configuration. When operating with a single supply, connect the VEE pins directly to the ground plane. Bypass V CC to ground with ceramic chip capacitors. Due to the MAX4265–MAX4270s’ wide bandwidth, use a 1nF capacitor in parallel with a 0.1µF to 1µF capacitor. If the device is located more than 10cm from the power supply, adding a larger bulk capacitor will improve performance. When operating with dual supplies, ensure that the total voltage across the device (V CC to V EE ) does not exceed +8V. Therefore, supplies of ±2.5V, ±3.3V, and asymmetrical supplies are possible. For example, operation with VCC = +5V and VEE = -3V provides sufficient voltage swing for the negative pulses found in video signals. When operating with dual supplies, the VCC pins and the VEE pins should be bypassed using the same guidelines stated in the paragraph above. 0.1M 1M 10M 100M 1G FREQUENCY (Hz) Figure 4c. MAX4270 Small-Signal Gain vs. Frequency With Isolation Resistor Because the MAX4265–MAX4270 have high bandwidth, circuit layout becomes critical. A solid ground plane provides a low-inductance path for high-speed transient currents. Use multiple vias to the ground plane for each bypass capacitor. If VEE is connected to ground, use multiple vias here, too. Avoid sharing ground vias with other signals to reduce crosstalk between circuit sections. Avoid stray capacitance at the op amp’s inverting inputs. Stray capacitance, in conjunction with the feedback resistance, forms an additional pole in the circuit’s transfer function, with its associate phase shift. Minimizing the trace lengths connected to the inverting input helps minimize stray capacitance. Chip Information MAX4265/66/67 TRANSISTOR COUNT: 132 MAX4268/69/70 TRANSISTOR COUNT: 285 PROCESS: Bipolar ______________________________________________________________________________________ 15 MAX4265–MAX4270 5 Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265–MAX4270 Pin Configurations TOP VIEW DISABLE 1 IN- 2 IN+ 3 MAX4265 MAX4266 MAX4267 VEE 4 µMAX/SO OUTA 1 14 VCC OUTA 1 16 VCC INA- 2 15 VCC 8 VCC INA- 2 13 VCC 7 VCC INA+ 3 12 N.C. INA+ 3 11 N.C. DISABLEA 4 10 INB+ DISABLEB 5 6 OUT 5 VEE DISABLEA 4 DISABLEB 5 MAX4268 MAX4269 MAX4270 VEE 6 9 INB- VEE 6 VEE 7 8 OUTB VEE 7 14 N.C. MAX4268 MAX4269 MAX4270 N.C. 8 12 INB+ 11 INB10 OUTB 9 SO QSOP 16 13 N.C. ______________________________________________________________________________________ N.C. Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable 8LUMAXD.EPS ______________________________________________________________________________________ 17 MAX4265–MAX4270 Package Information Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable SOICN.EPS MAX4265–MAX4270 Package Information (continued) 18 ______________________________________________________________________________________ Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable QSOP.EPS 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. 19 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX4265–MAX4270 Package Information (continued)