19-1552; Rev 2; 8/00
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.
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 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.
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.
Applications
Base-Station Amplifiers
IF Amplifiers
High-Frequency ADC Drivers
High-Speed DAC Buffers
RF Telecom Applications
High-Frequency Signal Processing
Features
♦ Operates from +4.5V to +8.0V
♦ Superior SFDR with 100Ω Load
-90dBc (f
= 5MHz)
C
-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
PIN-PACKAGETEMP. RANGEPART
MAX4265EUA
MAX4266EUA
MAX4267EUA
MAX4268EEE
MAX4269EEE
MAX4269ESD -40°C to +85°C 14 SO
MAX4270EEE
MAX4270ESD -40°C to +85°C 14 SO
µMAX is a registered trademark of Maxim Integrated Products, Inc.
-40°C to +85°C 8 µMAX
8 SO-40°C to +85°CMAX4265ESA
-40°C to +85°C 8 µMAX
8 SO-40°C to +85°CMAX4266ESA
-40°C to +85°C 8 µMAX
8 SO-40°C to +85°CMAX4267ESA
-40°C to +85°C 16 QSOP
14 SO-40°C to +85°CMAX4268ESD
-40°C to +85°C 16 QSOP
16 QSOP-40°C to +85°C
MAX4265–MAX4270
Pin Configurations appear at end of data sheet.
Selector Guide
PART
MAX4265 1 1 400
MAX4266 1 2 350
MAX4267 1 5 300
MAX4268 2 1 300
MAX4269 2 2 350
MAX4270 2 5 200
NO. OF
OP AMPS
________________________________________________________________ Maxim Integrated Products 1
MIN GAIN
(V/V)
-3dB
BANDWIDTH (MHz)
GBP
(MHz)
400
700
1500
300
700
1000
FULL-POWER
BANDWIDTH (MHz)
270
350
300
175
200
200
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +5V, VEE= 0, RL= 100Ω to VCC/2, VCM= VCC/2, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°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.
Supply Voltage (VCCto VEE)...............................................+8.5V
Voltage on Any Other Pin .................(V
EE
- 0.3V) to (VCC+ 0.3V)
Short-Circuit Duration (V
OUT
to VCCor 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
V
CC
- VOH, VOL- V
EE
V
1.1 1.5
V
OUT
Output Voltage Swing
DISABLE_ = V
EE
DISABLE_ = VEE, VEE≤ V
OUT
≤ V
CC
Disable mode, DISABLE_
= V
EE
Inferred from CMRR test
Normal mode, DISABLE_ = VCCor floating
Inferred from PSRR test
V
OUT
= 1V step, 0.1% settling time
Sinking or sourcing to VCCor V
EE
VCC= 4.5V to 8.0V
(VEE+ 1.6V) ≤ VCM≤ (VCC- 1.6V), no load
RL= 20Ω
-10mV ≤ VIN≤ 10mV
Either input (V
EE
+ 1.6V) ≤ VCM≤ (VCC- 1.6V)
MAX4268/MAX4269/MAX4270
1.75V ≤ V
OUT
≤ 3.25V
CONDITIONS
µA
5 100
DISABLE_ Logic Input Low
Current
V
VCC- 1.5
DISABLE_ Logic High
V
VCC- 3.5
DISABLE_ Logic Low
µA
0.2 2.5
Disable Output Leakage Current
1.6 5
28 32
I
S
Quiescent Supply Current
(per amplifier)
µs
10
t
PWRUP
Power-Up Time
Ω
0.035
R
OUT
Closed-Loop Output Resistance
mA
100
I
SC
Output Short-Circuit Current
mA
±30 ±45
I
OUT
Output Current Drive
dB
60 95
A
OL
Open-Loop Voltage Gain
mV
19
V
OS
Input Offset Voltage
V
VEE+ 1.6 VCC- 1.6
V
CM
V
4.5 8.0
V
CC
Operating Supply Voltage
Range
Common-Mode Input Voltage
dB
60 85
PSRRPower-Supply Rejection Ratio
dB
60 85
CMRRCommon-Mode Rejection Ratio
kΩ
40
R
INDIFF
Differential Input Resistance
MΩ
1
R
INCM
Common-Mode Input
Resistance
µV/°C
1.5
TCV
OS
Input Offset Voltage Drift
mV
1
Input Offset Voltage Channel
Matching
µA
3.5 40
I
B
Input Bias Current
µA
0.1 6
I
OS
Input Offset Current
UNITSMIN TYP MAXSYMBOLPARAMETER
DISABLE_ = V
CC
µA
130
DISABLE_
Logic Input High
Current
mA
mA
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, VEE= 0, RL= 100Ω to VCC/2, VCM= VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4265 400
MAX4266 350
MAX4267 300
MAX4268 300
MAX4269 350
Small-Signal -3dB Bandwidth
V
OU T
= 100m Vp - p
MAX4270 200
MAX4265 270
MAX4266 350
MAX4267 300
MAX4268 175
MAX4269 200
Full-Power Bandwidth FPBW V
OUT
= 1Vp-p
MAX4270 200
MAX4265 80
MAX4266 30
MAX4267 55
MAX4268 100
MAX4269 35
0.1dB Gain Flatness
V
OU T
= 100m Vp - p
MAX4270 35
All-Hostile Crosstalk f = 10MHz 85 dB
Slew Rate SR V
OUT
= +1V step 900
Rise/Fall Times tR, t
F
V
OUT
= +1V step 1 ns
Settling Time (0.1%) t
S,0.1
V
OUT
= +1V step 15 ns
fC = 1MHz 83
fC = 5MHz 85
fC = 10MHz 87
fC = 20MHz 81
fC = 60MHz 50
V
OUT
= 1Vp-p
(MAX4265/
MAX4266/
MAX4267)
f
C
= 100MHz 47
fC = 1MHz 85
fC = 5MHz 85
fC = 10MHz 84
fC = 20MHz 79
fC = 60MHz 68
Spurious-Free
Dynamic Range
SFDR
V
OUT
= 1Vp-p
(MAX4268)
f
C
= 100MHz 60
BW
BW
0.1dB
-3dB
MHz
MHz
MHz
V/µs
dBc
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, VEE= 0, RL= 100Ω to VCC/2, VCM= VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
fC = 1MHz 88
fC = 5MHz 90
fC = 10MHz 88
fC = 20MHz 79
fC = 60MHz 68
V
OUT
= 1Vp-p
(MAX4269)
f
C
= 100MHz 59
fC = 1MHz 86
fC = 5MHz 81
fC = 10MHz 75
fC = 20MHz 68
fC = 60MHz 60
Spurious-Free
Dynamic Range
SFDR
V
OUT
= 1Vp-p
(MAX4270)
f
C
= 100MHz 56
fC = 1MHz 83
fC = 5MHz 85
fC = 10MHz 87
fC = 20MHz 81
fC = 60MHz 50
V
OUT
= 1Vp-p
(MAX4265/
MAX4266/
MAX4267)
f
C
= 100MHz 47
fC = 1MHz 85
fC = 5MHz 85
fC = 10MHz 84
fC = 20MHz 79
fC = 60MHz 68
V
OUT
= 1Vp-p
(MAX4268)
f
C
= 100MHz 60
fC = 1MHz 88
fC = 5MHz 90
fC = 10MHz 88
fC = 20MHz 79
fC = 60MHz 68
V
OUT
= 1Vp-p
(MAX4269)
f
C
= 100MHz 59
fC = 1MHz 86
fC = 5MHz 81
fC = 10MHz 75
fC = 20MHz 68
fC = 60MHz 60
Second Harmonic
Distortion
V
OUT
= 1Vp-p
(MAX4270)
f
C
= 100MHz 56
dBc
dBc
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
_______________________________________________________________________________________ 5
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, VEE= 0, RL= 100Ω to VCC/2, VCM= VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
fC = 1MHz 98
fC = 5MHz 96
fC = 10MHz 91
fC = 20MHz 85
fC = 60MHz 75
V
OUT
= 1Vp-p
(MAX4265/
MAX4266/
MAX4267)
f
C
= 100MHz 61
fC = 1MHz 95
fC = 5MHz 95
fC = 10MHz 93
fC = 20MHz 86
fC = 60MHz 72
V
OUT
= 1Vp-p
(MAX4268)
f
C
= 100MHz 64
fC = 1MHz 88
fC = 5MHz 90
fC = 10MHz 88
fC = 20MHz 79
fC = 60MHz 68
V
OUT
= 1Vp-p
(MAX4269)
f
C
= 100MHz 59
fC = 1MHz 96
fC = 5MHz 97
fC = 10MHz 91
fC = 20MHz 84
fC = 60MHz 74
Third Harmonic
Distortion
V
OUT
= 1Vp-p
(MAX4270)
f
C
= 100MHz 69
MAX4265/MAX4268 32
MAX4266/MAX4269 35
Two-Tone, Third-Order
Intercept Distortion
IP3
V
OUT
= 1Vp-p,
f
CA
= 20MHz,
f
CB
= 21.25MHz
MAX4267/MAX4270 35
dBc
dBm
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
6 _______________________________________________________________________________________
4
-6
0.1M 1M 10M 100M 1G
MAX4268/MAX4269/MAX4270
SMALL-SIGNAL GAIN vs. FREQUENCY
-4
MAX4265/70-01
FREQUENCY (Hz)
GAIN (dB)
-2
0
2
1
-1
-3
-5
3
V
OUT
= 100mVp-p
MAX4270
MAX4269
MAX4268
Typical Operating Characteristics
(V
CC
= +5V, VEE= 0, DISABLE_ = +5V, RL= 100Ω to VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA= +25°C, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, VEE= 0, RL= 100Ω to VCC/2, VCM= VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
4
-6
0.1M 1M 10M 100M 1G
MAX4268/MAX4269/MAX4270
LARGE-SIGNAL GAIN
vs. FREQUENCY
-4
MAX4265/70-02
FREQUENCY (Hz)
GAIN (dB)
-2
0
2
1
-1
-3
-5
3
V
OUT
= 1Vp-p
MAX4269
MAX4270
MAX4268
0.4
-0.6
0.1M 1M 10M 100M 1G
MAX4268/MAX4269/MAX4270
GAIN FLATNESS vs. FREQUENCY
-0.4
MAX4265/70-03
FREQUENCY (Hz)
GAIN (dB)
-0.2
0
0.2
0.1
-0.1
-0.3
-0.5
0.3
MAX4268
MAX4270
MAX4269
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input -1dB Compression Point fC = 20MHz 12
dBm
Differential Gain D
G
NTSC, f = 3.58MHz, RL = 150Ω to VCC/2
%
Differential Phase D
P
NTSC, f = 3.58MHz, RL = 150Ω to VCC/2
degrees
Input Capacitance C
IN
2pF
Output Impedance R
OUT
f = 10MHz 1 Ω
Disabled Output Capacitance DISABLE_ = V
EE
5pF
Enable Time t
EN
VIN = +1V 100 ns
Disable Time t
DIS
VIN = +1V 750 µs
MAX4265/MAX4268 15
MAX4266/MAX4269 15
Capacitive Load Stability
No sustained
oscillation
MAX4267/MAX4270 22
pF
Input Voltage Noise Density e
n
f = 1kHz
8
nV/√Hz
Input Current Noise Density i
n
f = 1kHz 1
pA/√Hz
0.015
0.03
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(V
CC
= +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.)
4
-6
0.1M 1M 10M 100M 1G
MAX4265/MAX4266/MAX4267
SMALL-SIGNAL GAIN vs. FREQUENCY
-4
MAX4265/70-04
FREQUENCY (Hz)
GAIN (dB)
-2
0
2
1
-1
-3
-5
3
MAX4266
MAX4267
MAX4265
4
-6
0.1M 1M 10M 100M 1G
MAX4265/MAX4266/MAX4267
LARGE-SIGNAL GAIN vs. FREQUENCY
-4
MAX4265/70-05
FREQUENCY (Hz)
-2
0
2
1
-1
-3
-5
3
GAIN (dB)
V
OUT
= 1Vp-p
MAX4265
MAX4266
MAX4267
0.4
-0.6
0.1M 1M 10M 100M 1G
MAX4265/MAX4266/MAX4267
GAIN FLATNESS vs. FREQUENCY
-0.4
MAX4265/70-06
FREQUENCY (Hz)
-0.2
0
0.2
0.1
-0.1
-0.3
-0.5
0.3
GAIN (dB)
MAX4267
MAX4265
MAX4266
-20
-100
0.1 10 100
MAX4265/MAX4266/MAX4267
DISTORTION vs. FREQUENCY
-80
-90
-70
-60
-50
-40
-30
MAX4265/70-07
FREQUENCY (MHz)
DISTORTION (dB)
1
2ND HARMONIC
3RD HARMONIC
V
OUT
= 1Vp-p
-20
-100
0.1 10 100
MAX4268
DISTORTION vs. FREQUENCY
-80
-90
-70
-60
-50
-40
-30
MAX4265/70-08
FREQUENCY (MHz)
DISTORTION (dBc)
1
2ND HARMONIC
3RD HARMONIC
V
OUT
= 1Vp-p
-20
-100
0.1 10 100
MAX4269
DISTORTION vs. FREQUENCY
-80
-90
-70
-60
-50
-40
-30
MAX4265/70-09
FREQUENCY (MHz)
DISTORTION (dBc)
1
V
OUT
= 1Vp-p
3RD HARMONIC
2ND HARMONIC
-20
-100
0.1 10 100
MAX4270
DISTORTION vs. FREQUENCY
-80
-90
-70
-60
-50
-40
-30
MAX4265/70-10
FREQUENCY (MHz)
DISTORTION (dBc)
1
V
OUT
= 1Vp-p
3RD HARMONIC
2ND HARMONIC
-100
-90
-80
-70
-60
-50
-40
-30
-20
0 200100 300 400 500 600
MAX4265/MAX4266/MAX4267
DISTORTION vs. LOAD RESISTANCE
MAX4265/70-11
R
LOAD
(Ω)
DISTORTION (dBc)
fO = 5MHz
V
OUT
= 1V
p-p
3RD HARMONIC
2ND HARMONIC
-100
-90
-80
-70
-60
-50
-40
-30
-20
0 200100 300 400 500 600
MAX4268
DISTORTION vs. LOAD RESISTANCE
MAX4265/70-12
R
LOAD
(Ω)
DISTORTION (dBc)
fO = 5MHz
V
OUT
= 1Vp-p
3RD HARMONIC
2ND HARMONIC
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
CC
= +5V, VEE= 0, DISABLE_ = +5V, RL= 100Ω to VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA=+25°C, unless otherwise noted.)
-100
-90
-80
-70
-60
-50
-40
-30
-20
0 200100 300 400 500 600
MAX4269
DISTORTION vs. LOAD RESISTANCE
MAX4265/70-13
R
LOAD
(Ω)
DISTORTION (dBc)
fO = 5MHz
V
OUT
= 1Vp-p
3RD HARMONIC
2ND HARMONIC
-100
-90
-80
-70
-60
-50
-40
-30
-20
0 200100 300 400 500 600
MAX4270
DISTORTION vs. LOAD RESISTANCE
MAX4265/70-14
R
LOAD
(Ω)
DISTORTION (dBc)
fO = 5MHz
V
OUT
= 1Vp-p
3RD HARMONIC
2ND HARMONIC
-100
-90
-80
-70
-60
-50
-40
-30
-20
0 0.5 1.0 1.5 2.0 2.5
MAX4265/MAX4266/MAX4267
DISTORTION vs. VOLTAGE SWING
MAX4265/70-15
VOLTAGE SWING (V)
DISTORTION (dBc)
fO = 5MHz
2ND HARMONIC
3RD HARMONIC
-100
-80
-90
-70
-40
-30
-50
-60
-20
0 0.5 1.0 1.5 2.0 2.5
MAX4268
DISTORTION vs. VOLTAGE SWING
MAX4265/70-16
VOLTAGE SWING (Vp-p)
DISTORTION (dBc)
fO = 5MHz
3RD HARMONIC
2ND HARMONIC
-100
-80
-90
-70
-40
-30
-50
-60
-20
0 0.5 1.0 1.5 2.0 2.5
MAX4269
DISTORTION vs. VOLTAGE SWING
MAX4265/70-17
VOLTAGE SWING (Vp-p)
DISTORTION (dBc)
fO = 5MHz
3RD HARMONIC
2ND HARMONIC
-100
-80
-90
-70
-40
-30
-50
-60
-20
0 0.5 1.0 1.5 2.0 2.5
MAX4270
DISTORTION vs. VOLTAGE SWING
MAX4265/70-18
VOLTAGE SWING (Vp-p)
DISTORTION (dBc)
fO = 5MHz
3RD HARMONIC
2ND HARMONIC
0.1
0.001
0.1 10 100
0.01
FREQUENCY (MHz)
THD + NOISE (%)
1
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V
OUT
= 1Vp-p
MAX4266/MAX4269
MAX4267/MAX4270
MAX4265/MAX4268
MAX4265/70-19
-20
-100
0.1 10 100
SPURIOUS-FREE DYNAMIC RANGE
vs. FREQUENCY
-80
-90
-70
-60
-50
-40
-30
MAX4265/70-20
FREQUENCY (MHz)
SFDR (dBc)
1
V
OUT
= 1Vp-p
MAX4270
MAX4269
MAX4268
60
20
0.1 10 100
TWO-TONE THIRD-ORDER
INTERCEPT vs. FREQUENCY
30
25
35
40
45
50
55
MAX4265/70-21
FREQUENCY (MHz)
INTERCEPT (dBm)
1
MAX4266/MAX4269
MAX4267/MAX4270
MAX4265/MAX4268
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
_______________________________________________________________________________________ 9
1 10k 1M100101k 100k 10M
VOLTAGE NOISE vs. FREQUENCY
MAX4265/70-22
FREQUENCY (Hz)
1
10
100
VOLTAGE NOISE (nV/√Hz)
1000
100
10
1
0.1
0.01
0.1M 10M 100M1M 1G
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4265/70-23
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
0
-120
0.1M 10M 100M1M 1G
MAX4268/MAX4269/MAX4270
CROSSTALK vs. FREQUENCY
MAX4265/70-24
FREQUENCY (Hz)
CROSSTALK (dB)
-100
-80
-60
-40
-20
0.020
0.015
0.010
0.005
0.000
-0.005
MAX4265/MAX4268
DIFFERENTIAL GAIN AND PHASE
MAX4265/70-25
DIFF PHASE (°) DIFF GAIN (%)
0.04
0.03
0.02
0.01
0.00
-0.01
IRE 10010
IRE 100
R
L
= 150Ω
10
0.020
0.010
0.000
-0.010
-0.020
-0.030
MAX4266/MAX4269
DIFFERENTIAL GAIN AND PHASE
MAX4265/70-26
DIFF PHASE (°) DIFF GAIN (%)
0.012
0.008
0.004
0.000
-0.004
-0.008
IRE 10010
IRE 100
R
L
= 150Ω
10
0.006
0.004
0.002
0.000
-0.002
-0.004
-0.006
MAX4267/MAX4270
DIFFERENTIAL GAIN AND PHASE
MAX4265/70-27
DIFF PHASE (°) DIFF GAIN (%)
0.010
0.000
-0.010
-0.020
-0.030
IRE 10010
R
L
= 150Ω
IRE 10010
0
-100
0.1M 1M 10M 100M 1G
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-80
MAX4265/70-28
FREQUENCY (Hz)
PSRR (dB)
-60
-40
-20
-30
-50
-70
-90
-10
0
-90
10k 100k 1M 10M 100M 1G
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
-80
-70
MAX14265/70-29
FREQUENCY (Hz)
CMRR (dB)
-50
-60
-20
-10
-30
-40
0
1.0
0.5
2.0
1.5
3.0
2.5
3.5
4.5
4.0
5.0
0 200 400 600 800 1000
OUTPUT VOLTAGE SWING
vs. RESISTIVE LOAD RESISTANCE
MAX4265/70-30
R
LOAD
(Ω)
OUTPUT VOLTAGE SWING (V)
V
OH
V
OL
Typical Operating Characteristics (continued)
(V
CC
= +5V, VEE= 0, DISABLE_
= +5V, R
L
= 100Ω to VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA=+25°C, unless otherwise noted.)
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
10 ______________________________________________________________________________________
V
CC
2.5V/div
OUTPUT
500mV/div
0V
5V
POWER-UP/POWER-DOWN RESPONSE
MAX4265/70-31
5µs/div
INPUT TO
DISABLE_
OUTPUT
500mV/div
0V
ENABLEDISABLE
5V
DISABLE/ENABLE RESPONSE
MAX4265/70-32
250ns/div
-1.20
-1.10
-1.15
-1.00
-1.05
-0.95
-0.90
4.5 6.0 6.55.0 5.5 7.0 7.5 8.0
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
MAX4265/70-33
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE (mV)
0
-1.5
-1.0
-0.5
-3.5
-3.0
-2.5
-2.0
-4.0
-4.5
-5.0
4.5 6.0 6.55.0 5.5 7.0 7.5 8.0
INPUT BIAS CURRENT
vs. SUPPLY VOLTAGE
MAX4265/70-34
SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT (µA)
-2
-1
0
-3
-4
-5
-50 10 25-20-35 -5 40 55 70 85
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4265/70-37
TEMPERATURE (°C)
INPUT BIAS CURRENT (µA)
-500
-200
-300
-400
200
100
0
-100
300
400
500
-50 10 25-20-35 -5 40 55 70 85
INPUT OFFSET CURRENT
vs. TEMPERATURE
MAX4265/70-38
TEMPERATURE (°C)
INPUT OFFSET CURRENT (nA)
25
28
27
26
32
31
30
29
33
34
35
-50 10 25-20-35 -5 40 55 70 85
SUPPLY CURRENT (PER AMPLIFIER)
vs. TEMPERATURE
MAX4265/70-39
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
25
28
27
26
32
31
30
29
33
34
35
4.5 6.0 6.55.0 5.5 7.0 7.5 8.0
SUPPLY CURRENT (PER AMPLIFIER)
vs. SUPPLY VOLTAGE
MAX4265/70-35
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
-5
-2
-3
-4
2
1
0
-1
3
4
5
-50 10 25-20-35 -5 40 55 70 85
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4265/70-36
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE (mV)
Typical Operating Characteristics (continued)
(V
CC
= +5V, VEE= 0, DISABLE_
= +5V, R
L
= 100Ω to VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA=+25°C, unless otherwise noted.)
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
______________________________________________________________________________________ 11
0
1
3
2
4
5
-50 10 25-20-35 -5 40 55 70 85
VOLTAGE SWING vs. TEMPERATURE
MAX4265/70-40
TEMPERATURE (°C)
VOLTAGE SWING (V)
V
OH
V
OL
INPUT
50mV/div
OUTPUT
50mV/div
MAX4265/MAX4268
SMALL-SIGNAL PULSE RESPONSE
MAX4265/70-41
5ns/div
INPUT
25mV/div
OUTPUT
50mV/div
MAX4266/MAX4269
SMALL-SIGNAL PULSE RESPONSE
MAX4265/70-42
5ns/div
INPUT
10mV/div
OUTPUT
50mV/div
MAX4267/MAX4270
SMALL-SIGNAL PULSE RESPONSE
MAX4265/70-43
5ns/div
INPUT
500mV/div
OUTPUT
500mV/div
MAX4265/MAX4268
LARGE-SIGNAL PULSE RESPONSE
MAX4265/70-44
5ns/div
INPUT
250mV/div
OUTPUT
500mV/div
MAX4266/MAX4269
LARGE-SIGNAL PULSE RESPONSE
MAX4265/70-45
5ns/div
INPUT
100mV/div
OUTPUT
500mV/div
MAX4267/MAX4270
LARGE-SIGNAL PULSE RESPONSE
MAX4265/70-46
5ns/div
Typical Operating Characteristics (continued)
(V
CC
= +5V, VEE= 0, DISABLE_
= +5V, R
L
= 100Ω to VCC/2, MAX4265/MAX4268 AV= +1V/V, MAX4266/MAX4269 AV= +2V/V,
MAX4267/MAX4270 A
V
= +5V/V, TA=+25°C, unless otherwise noted.)
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
12 ______________________________________________________________________________________
Pin Description
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 (V
EE
+
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.
PIN
MAX4265
MAX4266
MAX4267
NAME
MAX4268
MAX4269
MAX4270
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.
1, 10
15, 16
8, 9, 13, 14
—
3, 12
6, 7
—
2, 11
—
4, 5
—
OUTA, OUTB1, 8—
V
CC
13, 147, 8
N.C.11, 12—
IN+—3
INA+, INB+3, 10—
V
EE
6, 74, 5
OUT—6
INA-, INB-2, 9—
IN-—2
8 µMAX/SO
DISABLEA, DISABLEB
4, 5—
DISABLE
—1
14 SO
FUNCTION
Disable Input. Active low.
16 QSOP
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
______________________________________________________________________________________ 13
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 R
F
= 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 RG= 11kΩ is en=
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
R
F
R
G
R
S
*
C
L
V
IN
PART
MAX4265
MAX4266
MAX4267
RF (Ω)
24
500
500
RG (Ω)
∞
500
125
GAIN (V/V)
+1
+2
+5
R
L
*OPTIONAL, USED TO MINIMIZE PEAKING FOR CL > 15pF.
MAX4265
MAX4266
MAX4267
Figure 1. Noninverting Configuration
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
14 ______________________________________________________________________________________
5
-5
0.1M 1M 10M 100M 1G
-3
FREQUENCY (Hz)
GAIN (dB)
-1
1
3
2
0
-2
-4
4
CL = 2.2pF
CL = 5.1pF
CL = 7.3pF
Figure 3a. MAX4268 Small-Signal Gain vs. Frequency
Without Isolation Resistor
5
-5
0.1M 1M 10M 100M 1G
-3
FREQUENCY (Hz)
GAIN (dB)
-1
1
3
2
0
-2
-4
4
CL = 2.2pF
CL = 5.1pF
CL = 7.3pF
Figure 3b. MAX4269 Small-Signal Gain vs. Frequency
Without Isolation Resistor
4
-6
0.1M 1M 10M 100M 1G
-4
FREQUENCY (Hz)
GAIN (dB)
-2
0
2
1
-1
-3
-5
3
CL = 10pF
CL = 15pF
CL = 7.3pF
Figure 3c. MAX4270 Small-Signal Gain vs. Frequency
Without Isolation Resistor
5
-5
0.1M 1M 10M 100M 1G
-3
FREQUENCY (Hz)
GAIN (dB)
-1
1
3
2
0
-2
-4
4
CL = 10pF
R
ISO
= 12Ω
CL = 10pF
R
ISO
= 15Ω
CL = 10pF
R
ISO
= 18Ω
Figure 4a. MAX4268 Small-Signal Gain vs. Frequency
With Isolation Resistor
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.
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 VCCfor 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.
20
15
10
5
0
06020 40 80 100 120
C
LOAD
(pF)
R
ISO
(Ω)
MAX4265/MAX4268
MAX4266/MAX4269
MAX4267/MAX4270
Figure 2. MAX4265–MAX4270 Isolation Resistance vs.
Capacitive Load
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
______________________________________________________________________________________ 15
5
-5
0.1M 1M 10M 100M 1G
-3
FREQUENCY (Hz)
GAIN (dB)
-1
1
3
2
0
-2
-4
4
CL = 10pF
R
ISO
= 12Ω
CL = 10pF
R
ISO
= 15Ω
CL = 10pF
R
ISO
= 18Ω
Figure 4b. MAX4269 Small-Signal Gain vs. Frequency With
Isolation Resistor
4
-6
0.1M 1M 10M 100M 1G
-4
FREQUENCY (Hz)
GAIN (dB)
-2
0
2
1
-1
-3
-5
3
CL = 22pF
R
ISO
= 22Ω
CL = 22pF
R
ISO
= 3.9Ω
CL = 22pF
R
ISO
= 6Ω
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 V
EE
pins directly to the ground plane. Bypass VCCto
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 VEE) does not
exceed +8V. Therefore, supplies of ±2.5V, ±3.3V, and
asymmetrical supplies are possible. For example, operation with V
CC
= +5V and VEE= -3V provides sufficient
voltage swing for the negative pulses found in video
signals. When operating with dual supplies, the V
CC
pins and the VEEpins 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 VEEis 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
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
16 ______________________________________________________________________________________
Pin Configurations
OUT
V
EE
V
EE
1
2
87V
CC
V
CC
IN-
IN+
DISABLE
µMAX/SO
3
4
6
5
MAX4265
MAX4266
MAX4267
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V
CC
V
CC
N.C.
N.C.DISABLEA
INA+
INA-
OUTA
TOP VIEW
MAX4268
MAX4269
MAX4270
INB+
INB-
OUTBV
EE
V
EE
DISABLEB
SO
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OUTA V
CC
V
CC
N.C.
N.C.
INB+
INB-
OUTB
N.C.
MAX4268
MAX4269
MAX4270
QSOP
INA-
INA+
V
EE
DISABLEA
DISABLEB
V
EE
N.C.
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
______________________________________________________________________________________ 17
8LUMAXD.EPS
PACKAGE OUTLINE, 8L uMAX/uSOP
1
1
21-0036
J
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
MAX
0.043
0.006
0.014
0.120
0.120
0.198
0.026
0.007
0.037
0.0207 BSC
0.0256 BSC
A2
A1
c
e
b
A
L
FRONT VIEW
SIDE VIEW
E H
0.6±0.1
0.6±0.1
Ø0.50±0.1
1
TOP VIEW
D
8
A2
0.030
BOTTOM VIEW
1
6°
S
b
L
H
E
D
e
c
0°
0.010
0.116
0.116
0.188
0.016
0.005
8
4X S
INCHES
-
A1
A
MIN
0.002
0.950.75
0.5250 BSC
0.25 0.36
2.95 3.05
2.95 3.05
4.78
0.41
0.65 BSC
5.03
0.66
6°0°
0.13 0.18
MAX
MIN
MILLIMETERS
- 1.10
0.05 0.15
α
α
DIM
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
18 ______________________________________________________________________________________
SOICN .EPS
PACKAGE OUTLINE, .150" SOIC
1
1
21-0041
B
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.050
0.016L
0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN
MAX
16 AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDE VIEW
H 0.2440.228 5.80 6.20
e 0.050 BSC 1.27 BSC
C
HE
e
B
A1
A
D
0∞-8∞
L
1
VARIATIONS:
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19
© 2000 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
QSOP.EPS
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
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