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19-1552; Rev 2; 8/00
Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable
General Description
The MAX4265-MAX4270 ultra-low distortion, voltage-feedback op amps are capable of driving a 100 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. 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 MAX package, and the MAX4268/ MAX4269/MAX4270 are available in a 16-pin QSOP package. o Operates from +4.5V to +8.0V o Superior SFDR with 100 Load -90dBc (fC = 5MHz ) -59dBc (fC = 100MHz) o 35dBm IP3 (fC = 20MHz) o 8nV/Hz Voltage Noise Density o 100MHz 0.1dB Gain Flatness (MAX4268) o 900V/s Slew Rate o 45mA Output Driving Capability o Disable Mode Places Outputs in High-Impedance State
Features
MAX4265-MAX4270
Ordering Information
PART MAX4265EUA MAX4265ESA MAX4266EUA MAX4266ESA MAX4267EUA MAX4267ESA MAX4268EEE MAX4268ESD MAX4269EEE MAX4269ESD MAX4270EEE MAX4270ESD TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 MAX 8 SO 8 MAX 8 SO 8 MAX 8 SO 16 QSOP 14 SO 16 QSOP 14 SO 16 QSOP 14 SO
Applications
Base-Station Amplifiers IF Amplifiers High-Frequency ADC Drivers High-Speed DAC Buffers RF Telecom Applications High-Frequency Signal Processing
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
1
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
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 = +70C) 8-Pin MAX (derate 4.10mW/C above +70C) ..........330mW 16-Pin QSOP (derate 8.33mW/C above +70C)........667mW 8-Pin SO (derate 5.9mW/C above +70C).................471mW 14-Pin SO (derate 8.33mW/C above +70C).............667mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
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 = 100 to VCC/2, VCM = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Supply Voltage Range Common-Mode Input Voltage Input Offset Voltage Input Offset Voltage Drift Input Offset Voltage Channel Matching Input Bias Current Input Offset Current Common-Mode Input Resistance Differential Input Resistance Common-Mode Rejection Ratio Power-Supply Rejection Ratio Open-Loop Voltage Gain Output Voltage Swing Output Current Drive Output Short-Circuit Current Closed-Loop Output Resistance Power-Up Time Quiescent Supply Current (per amplifier) Disable Output Leakage Current DISABLE_ Logic Low DISABLE_ Logic High DISABLE_ Logic Input Low Current DISABLE_ Logic Input High Current DISABLE_ = VEE DISABLE_ = VCC VCC - 1.5 5 1 100 30 IB IOS RINCM RINDIFF CMRR PSRR AOL VOUT IOUT ISC ROUT tPWRUP IS VOUT = 1V step, 0.1% settling time Normal mode, DISABLE_ = VCC or floating Disable mode, DISABLE_ = VEE DISABLE_ = VEE, VEE VOUT VCC Either input (VEE + 1.6V) VCM (VCC - 1.6V) -10mV VIN 10mV (VEE + 1.6V) VCM (VCC - 1.6V), no load VCC = 4.5V to 8.0V 1.75V VOUT 3.25V VCC - VOH, VOL - VEE RL = 20 Sinking or sourcing to VCC or VEE 30 60 60 60 SYMBOL VCC VCM VOS TCVOS MAX4268/MAX4269/MAX4270 CONDITIONS Inferred from PSRR test Inferred from CMRR test MIN 4.5 VEE + 1.6 1 1.5 1 3.5 0.1 1 40 85 85 95 1.1 45 100 0.035 10 28 1.6 0.2 32 5 2.5 VCC - 3.5 1.5 40 6 TYP MAX 8.0 VCC - 1.6 9 UNITS V V mV V/C mV A A M k dB dB dB V mA mA s mA mA A V V A A
2
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0, RL = 100 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 = +25C.)
PARAMETER SYMBOL CONDITIONS MAX4265 MAX4266 Small-Signal -3dB Bandwidth BW-3dB VOUT = 100mVp-p MAX4267 MAX4268 MAX4269 MAX4270 MAX4265 MAX4266 Full-Power Bandwidth FPBW VOUT = 1Vp-p MAX4267 MAX4268 MAX4269 MAX4270 MAX4265 MAX4266 0.1dB Gain Flatness BW0.1dB VOUT = 100mVp-p MAX4267 MAX4268 MAX4269 MAX4270 All-Hostile Crosstalk Slew Rate Rise/Fall Times Settling Time (0.1%) SR t R , tF tS,0.1 f = 10MHz VOUT = +1V step VOUT = +1V step VOUT = +1V step fC = 1MHz VOUT = 1Vp-p (MAX4265/ MAX4266/ MAX4267) Spurious-Free Dynamic Range SFDR fC = 5MHz fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4268) fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz MIN TYP 400 350 300 300 350 200 270 350 300 175 200 200 80 30 55 100 35 35 85 900 1 15 83 85 87 81 50 47 85 85 84 79 68 60 dBc dB V/s ns ns MHz MHz MHz MAX UNITS
MAX4265-MAX4270
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0, RL = 100 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 = +25C.)
PARAMETER SYMBOL CONDITIONS fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4269) fC = 10MHz fC = 20MHz fC = 60MHz Spurious-Free Dynamic Range SFDR fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4270) fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz fC = 1MHz VOUT = 1Vp-p (MAX4265/ MAX4266/ MAX4267) fC = 5MHz fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4268) Second Harmonic Distortion fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4269) fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4270) fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz MIN TYP 88 90 88 79 68 59 86 81 75 68 60 56 83 85 87 81 50 47 85 85 84 79 68 60 88 90 88 79 68 59 86 81 75 68 60 56 dBc dBc MAX UNITS
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0, RL = 100 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 = +25C.)
PARAMETER SYMBOL CONDITIONS fC = 1MHz VOUT = 1Vp-p (MAX4265/ MAX4266/ MAX4267) fC = 5MHz fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4268) fC = 10MHz fC = 20MHz fC = 60MHz Third Harmonic Distortion fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4269) fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz fC = 1MHz fC = 5MHz VOUT = 1Vp-p (MAX4270) fC = 10MHz fC = 20MHz fC = 60MHz fC = 100MHz Two-Tone, Third-Order Intercept Distortion IP3 VOUT = 1Vp-p, fCA = 20MHz, fCB = 21.25MHz MAX4265/MAX4268 MAX4266/MAX4269 MAX4267/MAX4270 MIN TYP 98 96 91 85 75 61 95 95 93 86 72 64 88 90 88 79 68 59 96 97 91 84 74 69 32 35 35 dBm dBc MAX UNITS
MAX4265-MAX4270
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0, RL = 100 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 = +25C.)
PARAMETER Input -1dB Compression Point Differential Gain Differential Phase Input Capacitance Output Impedance Disabled Output Capacitance Enable Time Disable Time tEN tDIS DG DP CIN ROUT f = 10MHz DISABLE_ = VEE VIN = +1V VIN = +1V MAX4265/MAX4268 Capacitive Load Stability Input Voltage Noise Density Input Current Noise Density en in No sustained oscillation f = 1kHz f = 1kHz MAX4266/MAX4269 MAX4267/MAX4270 SYMBOL fC = 20MHz NTSC, f = 3.58MHz, RL = 150 to VCC/2 NTSC, f = 3.58MHz, RL = 150 to VCC/2 CONDITIONS MIN TYP 12 0.015 0.03 2 1 5 100 750 15 15 22 8 1 nV/Hz pA/Hz pF MAX UNITS dBm % degrees pF pF ns s
Typical Operating Characteristics
(VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100 to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA = +25C, unless otherwise noted.)
MAX4268/MAX4269/MAX4270 SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4265/70-01
MAX4268/MAX4269/MAX4270 LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4265/70-02
MAX4268/MAX4269/MAX4270 GAIN FLATNESS vs. FREQUENCY
0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 MAX4270 MAX4269 MAX4268
MAX4265/70-03
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6
VOUT = 100mVp-p
4 3 2 1 GAIN (dB) 0 -1 -2 -3
VOUT = 1Vp-p
0.4
MAX4268
MAX4268
MAX4269
MAX4269 MAX4270
MAX4270
-4 -5 -6
0.1M
1M
10M FREQUENCY (Hz)
100M
1G
0.1M
1M
10M FREQUENCY (Hz)
100M
1G
0.1M
1M
10M FREQUENCY (Hz)
100M
1G
6
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100 to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25C, unless otherwise noted.)
MAX4265/MAX4266/MAX4267 SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4265/70-04
MAX4265/MAX4266/MAX4267 LARGE-SIGNAL GAIN vs. FREQUENCY
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 MAX4266 MAX4267 VOUT = 1Vp-p
MAX4265/70-05
MAX4265/MAX4266/MAX4267 GAIN FLATNESS vs. FREQUENCY
0.3 0.2 GAIN (dB) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 MAX4267 0.1M 1M 10M FREQUENCY (Hz) 100M 1G MAX4266 MAX4265
MAX4265/70-06
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 0.1M 1M 10M FREQUENCY (Hz) 100M MAX4267 MAX4266 MAX4265
4
0.4
MAX4265
-5 -6 1G 0.1M 1M 10M FREQUENCY (Hz) 100M 1G
MAX4265/MAX4266/MAX4267 DISTORTION vs. FREQUENCY
MAX4265/70-07
MAX4268 DISTORTION vs. FREQUENCY
MAX4265/70-08
MAX4269 DISTORTION vs. FREQUENCY
VOUT = 1Vp-p -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 0.1 1 10 100 2ND HARMONIC 3RD HARMONIC
MAX4265/70-09
-20 -30 -40 -50 -60 -70 -80 -90 -100 0.1
VOUT = 1Vp-p
-20 VOUT = 1Vp-p -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 2ND HARMONIC 3RD HARMONIC 0.1 1 10
-20
DISTORTION (dB)
2ND HARMONIC 3RD HARMONIC 1 10 100
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4270 DISTORTION vs. FREQUENCY
MAX4265/70-10
MAX4265/MAX4266/MAX4267 DISTORTION vs. LOAD RESISTANCE
MAX4265/70-11
MAX4268 DISTORTION vs. LOAD RESISTANCE
-30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 2ND HARMONIC 3RD HARMONIC 0 100 200 300 RLOAD () 400 500 600 fO = 5MHz VOUT = 1Vp-p
MAX4265/70-12
-20 VOUT = 1Vp-p -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 0.1 1 10 2ND HARMONIC 3RD HARMONIC
-20 -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 0
fO = 5MHz VOUT = 1Vp-p
-20
2ND HARMONIC 3RD HARMONIC 100 200 300 RLOAD () 400 500 600
100
FREQUENCY (MHz)
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100 to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25C, unless otherwise noted.)
MAX4269 DISTORTION vs. LOAD RESISTANCE
MAX4265/70-13
MAX4270 DISTORTION vs. LOAD RESISTANCE
MAX4265/70-14
MAX4265/MAX4266/MAX4267 DISTORTION vs. VOLTAGE SWING
fO = 5MHz -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 3RD HARMONIC 0 0.5 1.0 1.5 2.0 2.5 VOLTAGE SWING (V) 2ND HARMONIC
MAX4265/70-15
-20 -30 -40 DISTORTION (dBc) fO = 5MHz VOUT = 1Vp-p
-20 -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 2ND HARMONIC 3RD HARMONIC 0 100 200 300 RLOAD () 400 500 fO = 5MHz VOUT = 1Vp-p
-20
-50 -60 -70 -80 -90 -100 0 100 200 300 RLOAD () 400 500 600 2ND HARMONIC 3RD HARMONIC
600
MAX4268 DISTORTION vs. VOLTAGE SWING
MAX4265/70-16
MAX4269 DISTORTION vs. VOLTAGE SWING
MAX4265/70-17
MAX4270 DISTORTION vs. VOLTAGE SWING
fO = 5MHz -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 2ND HARMONIC 3RD HARMONIC 0 0.5 1.0 1.5 2.0 2.5
MAX4265/70-18
-20 -30 -40 DISTORTION (dBc) -50 -60 -70
fO = 5MHz
-20 -30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90
fO = 5MHz
-20
2ND HARMONIC -80 -90 3RD HARMONIC -100 0 0.5 1.0 1.5 2.0 2.5 VOLTAGE SWING (Vp-p) -100 0 0.5
2ND HARMONIC 3RD HARMONIC
1.0
1.5
2.0
2.5
VOLTAGE SWING (Vp-p)
VOLTAGE SWING (Vp-p)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4265/70-19
SPURIOUS-FREE DYNAMIC RANGE vs. FREQUENCY
MAX4265/70-20
TWO-TONE THIRD-ORDER INTERCEPT vs. FREQUENCY
55 50 INTERCEPT (dBm) 45 40 35 30 25 MAX4267/MAX4270 MAX4265/MAX4268 MAX4266/MAX4269
MAX4265/70-21
0.1 VOUT = 1Vp-p
-20 VOUT = 1Vp-p -30 -40
60
THD + NOISE (%)
MAX4267/MAX4270 0.01
SFDR (dBc)
-50 -60 -70 MAX4270 MAX4269
MAX4266/MAX4269 0.001 0.1 1
MAX4265/MAX4268
-80 -90
MAX4268 -100 10 100 0.1 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) 20 0.1 1 10 100 FREQUENCY (MHz)
8
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100 to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25C, unless otherwise noted.)
MAX4268/MAX4269/MAX4270 CROSSTALK vs. FREQUENCY
MAX4265/70-23 MAX4265/70-24
VOLTAGE NOISE vs. FREQUENCY
MAX4265/70-22
OUTPUT IMPEDANCE vs. FREQUENCY
1000 0 -20 CROSSTALK (dB) -40 -60 -80 -100 -120 1M 10M FREQUENCY (Hz) 100M 1G 0.1M
100
VOLTAGE NOISE (nV/Hz)
OUTPUT IMPEDANCE ()
100
10
10
1
0.1 1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 0.01 0.1M
1M
10M FREQUENCY (Hz)
100M
1G
MAX4265/MAX4268 DIFFERENTIAL GAIN AND PHASE
MAX4265/70-25
MAX4266/MAX4269 DIFFERENTIAL GAIN AND PHASE
MAX4265/70-26
MAX4267/MAX4270 DIFFERENTIAL GAIN AND PHASE
0.006 0.004 0.002 0.000 -0.002 -0.004 -0.006 10 0.010 IRE 100 DIFF GAIN (%)
MAX4265/70-27
0.020 0.015 0.010 0.005 0.000 -0.005 10 IRE 100
0.020 0.010 0.000 -0.010 -0.020 -0.030 10 IRE 100
DIFF GAIN (%)
DIFF GAIN (%)
0.04 0.03 0.02 0.01 0.00 -0.01 10 RL = 150 IRE 100
0.012 0.008 0.004 0.000 -0.004 -0.008 10 RL = 150 IRE 100
DIFF PHASE ()
DIFF PHASE ()
DIFF PHASE ()
0.000 -0.010 -0.020 -0.030 10 RL = 150 IRE 100
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4265/70-28
COMMON-MODE REJECTION RATIO vs. FREQUENCY
MAX14265/70-29
OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD RESISTANCE
4.5 OUTPUT VOLTAGE SWING (V) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 VOL 0 200 400 600 800 1000
MAX4265/70-30
0 -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100 0.1M 1M 10M FREQUENCY (Hz) 100M
0 -10 -20 -30 CMRR (dB) -40 -50 -60 -70 -80 -90
5.0 VOH
1G
10k
100k
1M
10M
100M
1G
FREQUENCY (Hz)
RLOAD ()
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100 to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25C, unless otherwise noted.)
POWER-UP/POWER-DOWN RESPONSE
MAX4265/70-31
DISABLE/ENABLE RESPONSE
MAX4265/70-32
INPUT OFFSET VOLTAGE vs. SUPPLY VOLTAGE
MAX4265/70-33
-0.90 -0.95 -1.00 -1.05 -1.10 -1.15 -1.20
VCC 2.5V/div
INPUT TO DISABLE_
5V
5V 0V DISABLE ENABLE 250ns/div
0V
5s/div
INPUT OFFSET VOLTAGE (mV)
OUTPUT 500mV/div
OUTPUT 500mV/div
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT vs. SUPPLY VOLTAGE
MAX4265/70-34
SUPPLY CURRENT (PER AMPLIFIER) vs. SUPPLY VOLTAGE
MAX4265/70-35
INPUT OFFSET VOLTAGE vs. TEMPERATURE
4 INPUT OFFSET VOLTAGE (mV) 3 2 1 0 -1 -2 -3 -4 -5
MAX4265/70-36
-5.0 -4.5 INPUT BIAS CURRENT (A) -4.0 -3.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 4.5 5.0 5.5 6.0 6.5 7.0 7.5
35 34 33 SUPPLY CURRENT (mA) 32 31 30 29 28 27 26 25
5
8.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
-50 -35 -20 -5
10
25
40
55
70
85
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4265/70-37
INPUT OFFSET CURRENT vs. TEMPERATURE
MAX4265/70-38
SUPPLY CURRENT (PER AMPLIFIER) vs. TEMPERATURE
34 33 SUPPLY CURRENT (mA) 32 31 30 29 28 27 26 25
MAX4265/70-39
-5
500 400 INPUT OFFSET CURRENT (nA) 300 200 100 0 -100 -200 -300 -400
35
INPUT BIAS CURRENT (A)
-4
-3
-2
-1
0 -50 -35 -20 -5 10 25 40 55 70 85 TEMPERATURE (C)
-500 -50 -35 -20 -5 10 25 40 55 70 85 TEMPERATURE (C)
-50 -35 -20 -5
10
25
40
55
70
85
TEMPERATURE (C)
10
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, DISABLE_ = +5V, RL = 100 to VCC/2, MAX4265/MAX4268 AV = +1V/V, MAX4266/MAX4269 AV = +2V/V, MAX4267/MAX4270 AV = +5V/V, TA =+25C, unless otherwise noted.)
VOLTAGE SWING vs. TEMPERATURE
MAX4265/70-40
MAX4265/MAX4268 SMALL-SIGNAL PULSE RESPONSE
MAX4265/70-41
MAX4266/MAX4269 SMALL-SIGNAL PULSE RESPONSE
MAX4265/70-42
5 VOH
4 VOLTAGE SWING (V)
3
INPUT 50mV/div
INPUT 25mV/div
2 OUTPUT 50mV/div OUTPUT 50mV/div
1
VOL
0 -50 -35 -20 -5 10 25 40 55 70 85 5ns/div 5ns/div TEMPERATURE (C)
MAX4267/MAX4270 SMALL-SIGNAL PULSE RESPONSE
MAX4265/70-43
MAX4265/MAX4268 LARGE-SIGNAL PULSE RESPONSE
MAX4265/70-44
INPUT 10mV/div
INPUT 500mV/div
OUTPUT 50mV/div
OUTPUT 500mV/div
5ns/div
5ns/div
MAX4266/MAX4269 LARGE-SIGNAL PULSE RESPONSE
MAX4265/70-45
MAX4267/MAX4270 LARGE-SIGNAL PULSE RESPONSE
MAX4265/70-46
INPUT 250mV/div
INPUT 100mV/div
OUTPUT 500mV/div
OUTPUT 500mV/div
5ns/div
5ns/div
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11
Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Pin Description
PIN MAX4265 MAX4266 MAX4267 8 MAX/SO 1 -- 2 -- 3 -- 4, 5 6 -- 7, 8 -- MAX4268 MAX4269 MAX4270 14 SO -- 4, 5 -- 2, 9 -- 3, 10 6, 7 -- 1, 8 13, 14 11, 12 16 QSOP -- 4, 5 -- 2, 11 -- 3, 12 6, 7 -- 1, 10 15, 16 8, 9, 13, 14 DISABLE DISABLEA, DISABLEB ININA-, INBIN+ INA+, INB+ VEE OUT OUTA, OUTB VCC N.C. Disable Input. Active low. Disable Input. Active low. Inverting Input Inverting Input Noninverting Input Noninverting Input Negative Power Supply Amplifier Output Amplifier Output Positive Power Supply. Connect to a +4.5V to +8.0V supply. No Connection. Not internally connected. NAME FUNCTION
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 100 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):
* 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.
12
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable
Choosing Resistor Values
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 = 1k 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 1k resistors to 100 extends the pole frequency to 1.28GHz, but could limit output swing by adding 200 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 500 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 = 100k and R G = 11k is e n = 18nV/Hz. The input noise can be reduced to 8nV/Hz by choosing RF = 1k, RG = 110.
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 6 (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.
MAX4265-MAX4270
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 RL
MAX4265 MAX4266 MAX4267
RF () RG ()
PART
GAIN (V/V)
MAX4265 MAX4266 MAX4267
24 500 500
500 125
+1 +2 +5
*OPTIONAL, USED TO MINIMIZE PEAKING FOR CL > 15pF.
Figure 1. Noninverting Configuration
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13
Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
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.
20
15 MAX4265/MAX4268 RISO () 10 MAX4266/MAX4269
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 750s.
5 4 3 2 GAIN (dB) 1 0 -1 -2 -3 -4 -5 0.1M 1M 10M FREQUENCY (Hz) 100M 1G CL = 7.3pF CL = 2.2pF CL = 5.1pF
5
MAX4267/MAX4270
0 0 20 40 60 CLOAD (pF) 80 100 120
Figure 2. MAX4265-MAX4270 Isolation Resistance vs. Capacitive Load
5 4 3 2 GAIN (dB) 1 0 -1 -2 -3 -4 -5 0.1M 1M 10M FREQUENCY (Hz) 100M 1G CL = 2.2pF CL = 5.1pF CL = 7.3pF
Figure 3a. MAX4268 Small-Signal Gain vs. Frequency Without Isolation Resistor
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 0.1M 1M 10M FREQUENCY (Hz) 100M 1G CL = 10pF CL = 7.3pF CL = 15pF
Figure 3b. MAX4269 Small-Signal Gain vs. Frequency Without Isolation Resistor
5 4 3 2 GAIN (dB) 1 0 -1 -2 -3 -4 -5 0.1M 1M 10M FREQUENCY (Hz) 100M 1G CL = 10pF RISO = 18 CL = 10pF RISO = 12 CL = 10pF RISO = 15
Figure 3c. MAX4270 Small-Signal Gain vs. Frequency Without Isolation Resistor 14
Figure 4a. MAX4268 Small-Signal Gain vs. Frequency With Isolation Resistor
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
5 4 3 2 GAIN (dB) 1 0 -1 -2 -3 -4 -5 0.1M 1M 10M FREQUENCY (Hz) 100M 1G CL = 10pF RISO = 18 CL = 10pF RISO = 12 CL = 10pF RISO = 15 4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 0.1M 1M 10M FREQUENCY (Hz) 100M 1G CL = 22pF RISO = 6 CL = 22pF RISO = 22 CL = 22pF RISO = 3.9
Figure 4b. MAX4269 Small-Signal Gain vs. Frequency With Isolation Resistor
Figure 4c. MAX4270 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 0.1F to 1F 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.
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
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15
Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Pin Configurations
TOP VIEW
OUTA 1 DISABLE 1 IN- 2 IN+ 3 8 7 VCC VCC OUT VEE INAINA+ 2 3
14 VCC 13 VCC 12 N.C.
OUTA 1 INA- 2 INA+ 3 DISABLEA 4 DISABLEB 5 VEE 6 VEE 7 N.C. 8
16 VCC 15 VCC 14 N.C.
MAX4265 MAX4266 MAX4267
6 5
DISABLEA 4 DISABLEB 5 VEE 6 VEE 7
MAX4268 MAX4269 MAX4270
11 N.C. 10 INB+ 9 8 INBOUTB
MAX4268 MAX4269 MAX4270
13 N.C. 12 INB+ 11 INB10 OUTB 9 N.C.
VEE 4
MAX/SO
SO QSOP
16
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable
Package Information
8LUMAXD.EPS
MAX4265-MAX4270
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17
Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable MAX4265-MAX4270
Package Information (continued)
SOICN.EPS
18
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Ultra-Low-Distortion, +5V, 400MHz Op Amps with Disable
Package Information (continued)
QSOP.EPS
MAX4265-MAX4270
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 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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