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19-1831; Rev 0; 11/00
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs
General Description
The MAX4412 single and MAX4413 dual operational amplifiers are unity-gain-stable devices that combine high-speed performance, low supply current, and ultrasmall packaging. Both devices operate from a single +2.7V to +5.5V supply, have Rail-to Rail(R) outputs, and exhibit a common-mode input voltage range that extends from 100mV below ground to within +1.5V of the positive supply rail. The MAX4412/MAX4413 achieve a 500MHz -3dB bandwidth and a 220V/s slew rate while consuming only 1.7mA of supply current per amplifier. This makes the MAX4412/MAX4413 ideal for low-power/low-voltage, high-speed portable applications such as video, communications, and instrumentation. For systems requiring tighter specifications, Maxim offers the MAX4414-MAX4419 family of operational amplifiers. The MAX4414-MAX4419 are laser trimmed versions of the MAX4412/MAX4413 and include compensated and uncompensated devices. The MAX4412 is available in ultra-small 5-pin SC70 and SOT23 packages, while the MAX4413 is available in a space-saving 8-pin SOT23. o Ultra-Low 1.7mA Supply Current o Low Cost o Single +3V/+5V Operation o High Speed 500MHz -3dB Bandwidth 50MHz 0.1dB Gain Flatness 220V/s Slew Rate o Rail-to-Rail Outputs o Input Common-Mode Range Extends Beyond VEE o Low Differential Gain/Phase: 0.01%/0.03 o Low Distortion at 5MHz -93dBc SFDR 0.003% Total Harmonic Distortion o Ultra-Small SC70-5, SOT23-5, and SOT23-8 Packages
Features
MAX4412/MAX4413
________________________Applications
Battery-Powered Instruments Portable Communications Keyless Entry Systems Cellular Telephones Video Line Drivers Baseband Applications
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
PART MAX4412EXK-T MAX4412EUK-T MAX4413EKA-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SC70-5 5 SOT23-5 8 SOT23-8 TOP MARK ABH ADOL AADR
Typical Operating Characteristic
SUPPLY CURRENT vs. SUPPLY VOLTAGE (PER AMPLIFER)
1.9 SUPPLY CURRENT (mA) 1.8 1.7 1.6 1.5 1.4 1.3 1.2 2.7 3.1 3.5 4.7 4.3 SUPPLY VOLTAGE (V) 3.9 5.1 5.5
MAX4412 toc01
Pin Configurations
2.0
TOP VIEW
OUT VEE IN+
1 2
5
VCC
OUTA INA-
1 2
8 7
VCC OUTB INBINB+
MAX4412
3 4 ININA+ 3 VEE 4
MAX4413
6 5
SC70/SOT23 SOT23
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE)..................................................+6V Differential Input Voltage ....................................................2.5V IN_-, IN_+, OUT_..............................(VCC + 0.3V) to (VEE - 0.3V) Current into Input Pins ......................................................20mA Output Short-Circuit Duration to VCC or VEE ..............Continuous Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ..............247mW 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW 8-Pin SOT23 (derate 9.1mW/C above +70C)............727mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +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 = +2.7V to +5.5V, VCM = VCC /2 - 0.75V, VEE = 0, RL = to VCC /2, VOUT = VCC /2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Operating Supply Voltage Range Quiescent Supply Current (per amplifier) Input Common Mode Voltage Range Input Offset Voltage Input Offset Voltage Temperature Coefficient Input Offset Voltage Matching Input Bias Current Input Offset Current IB IOS Differential mode, -0.04V (VIN+ - VIN-) +0.04V Common mode, VEE - 0.1V < VCM < VCC - 1.5V VEE - 0.1V < VCM < VCC - 1.5V +0.2V VOUT +4.8V, RL = 10k VCC = +5V +0.4V VOUT +4.6V, RL = 1k +1V VOUT +4V, RL = 150 +0.2V VOUT +2.8V, RL = 10k VCC = +3V +0.25V VOUT +2.75V RL = 1k +0.5V VOUT +2.5V, RL = 150 60 78 68 SYMBOL VS IS VCM VOS TCVOS MAX4413 VCC = +5V VCC = +3V Guaranteed by CMRR test VEE 0.1 0.4 3 1 1.6 0.1 60 16 94 93 80 65 dB 90 78 62 4 0.7 CONDITIONS Guaranteed by PSRR test MIN 2.7 1.7 1.5 VCC 1.5 9 TYP MAX 5.5 3.5 UNITS V mA V mV V/C mV A A k M dB
Input Resistance
RIN
Common Mode Rejection Ratio
CMRR
Open-Loop Gain
AVOL
2
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, VCM = VCC /2 - 0.75V, VEE = 0, RL = to VCC /2, VOUT = VCC /2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS RL = 10k VCC = +5V RL = 1k RL = 150 RL = 10k VCC = +3V RL = 1k RL = 150 Output Current Output Short-Circuit Current Power Supply Rejection Ratio IOUT ISC PSRR Sinking or sourcing VCC = +2.7V to +5.5V, VCM = 0, VOUT = 2V 60 VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE 25 MIN TYP 0.085 0.015 0.105 0.035 0.385 0.150 0.06 0.01 0.075 0.025 0.275 0.070 75 85 77 mA mA dB V 0.275 0.125 MAX UNITS
MAX4412/MAX4413
Output Voltage Swing
VOUT
RL = 20 connected to VCC or VEE, VCC = +5V
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0, VCM = +1.75V, RL = 1k connected to VCC /2, CL = 5pF, AVCL = +1V/ V , TA = +25C, unless otherwise noted.)
PARAMETER Small Signal -3dB Bandwidth Large Signal -3dB Bandwidth Bandwidth for 0.1dB Flatness Slew Rate Rise/Fall Time Settling Time to 0.1% Spurious-Free Dynamic Range SYMBOL BWSS BWLS BW0.1dB SR tR, tF tS 1% SFDR VOUT = 2Vp-p VOUT = 100mVp-p VOUT = 2Vp-p VOUT = 2V step VOUT = 2V step, 10% to 90% VOUT = 2V step VCC = +5V, fC = 5MHz, VOUT = 1Vp-p VCC = +3V, fC = 5MHz, VOUT = 1Vp-p CONDITIONS VOUT = 100mVp-p MIN TYP 500 30 50 16 220 14 100 -84 -93 MAX UNITS MHz MHz MHz V/s ns ns dBc
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0, VCM = +1.75V, RL = 1k connected to VCC /2, CL = 5pF, AVCL = +1V/ V , TA = +25C, unless otherwise noted.)
PARAMETER 2nd Harmonic Distortion 3rd Harmonic Distortion Total Harmonic Distortion Two-Tone, Third-Order Intermodulation Distortion Differential Gain Error Differential Phase Error Gain Matching Phase Matching Input Noise-Voltage Density Input Noise-Current Density Input Capacitance Output Impedance Capacitive Load Drive Power-Up 1% Settling Time (Note 2) Crosstalk XTALK MAX4413, f = 10MHz, VOUT = 2Vp-p en In CIN ZOUT f = 1MHz No sustained oscillations THD IP3 DG DP SYMBOL CONDITIONS VCC = +5V, fC = 5MHz, VOUT = 1Vp-p VCC = +3V, fC = 5MHz, VOUT = 1Vp-p VCC = +5V, fC = 5MHz, VOUT = 1Vp-p VCC = +3V, fC = 5MHz, VOUT = 1Vp-p VCC = +5V, fC = 5MHz, VOUT = 1Vp-p VCC = +3V, fC = 5MHz, VOUT = 1Vp-p f1 = 10MHz, f2 = 9.9MHz RL = 150, NTSC RL = 150, NTSC AV = +1V/V AV = +2V/V AV = +1V/V AV = +2V/V MIN TYP -84 -93 -95 -95 0.007 0.003 -67 0.03 0.01 0.13 0.03 0.1 0.1 13 0.7 1.8 0.7 120 1.2 -82 100 MAX UNITS dBc dBc % dBc % degrees dB degrees nV/Hz pA/ Hz pF pF s dB
MAX4413, VOUT = 100mVp-p, f 10MHz MAX4413, VOUT = 100mVp-p f 10MHz f = 10kHz f = 10kHz
Note 1: All devices are 100% production tested at TA = +25C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design.
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
Typical Operating Characteristics
(VCC = +5V, VEE = 0, VCM = +1.75V, AVCL = +1V/V, RF = 24, RL = 1k to VCC/2, CL = 5pF, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE (PER AMPLIFER)
MAX4412 toc01
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4412 toc02
SMALL-SIGNAL GAIN with CAPACATIVE LOAD vs. FREQUENCY
8 22pF SMALL-SIGNAL GAIN (dB) 6 4 2 0 -2 5pF -4 -6 15pF
MAX4412 toc03
2.0 1.9 SUPPLY CURRENT (mA) 1.8 1.7 1.6 1.5 1.4 1.3 1.2 2.7 3.1 3.5 4.7 4.3 SUPPLY VOLTAGE (V) 3.9 5.1
3 2 SMALL-SIGNAL GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6
10
5.5
-7 100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
SMALL-SIGNAL GAIN with CAPACITIVE LOAD and 22 ISOLATION RESISTOR vs. FREQUENCY
MAX4412 toc04
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX4412 toc05
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
0.4 LARGE-SIGNAL GAIN (dB) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 VOUT = 2VP-P VOUT = 1VP-P
MAX4412 toc06
5 4 SMALL-SIGNAL GAIN (dB) 3 2 1 0 -1 -2 -3 -4 -5 100k 1M 10M FREQUENCY (Hz) 100M 5pF 22pF 15pF
0.5 0.4 0.3 GAIN FLATNESS (dB) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4
0.5
1G
-0.5 100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
MAX4412 toc07
2 1 LARGE-SIGNAL GAIN (dB) 0 VOUT = 1VP-P VOUT = 2VP-P
AVCL = +1000V/V 80 60 GAIN (dB) 40 20 0 -20 -40 -60 PHASE GAIN
180 135 90 45 0 -45 -90 -135 -180 PHASE (deg)
-1 -2 -3 -4 -5 -6 -7 100k 1M
0.04 0.03 0.02 0.01 0 0
DIFFERENTIAL PHASE (deg)
10 20 30 40 50 60 70 80 90 100 IRE
0.15 0.10 0.05 0 0 10 20 30 40 50 60 70 80 90 100 IRE
10M FREQUENCY (Hz)
100M
1G
10k
100K
1M
10M
100M
1G
FREQUENCY (Hz)
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5
MAX4412 toc10
3
100
MAX4412 toc09
DIFFERENTIAL GAIN (%)
LARGE-SIGNAL GAIN vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
DIFFERENTIAL GAIN AND PHASE
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24, RL = 1k to VCC/2, CL = 5pF, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE
MAX4412 toc11
LARGE-SIGNAL PULSE RESPONSE
MAX4412 toc12
LARGE-SIGNAL PULSE RESPONSE
MAX4412 toc13
INPUT 50mV/div
INPUT 500mV/div
INPUT 1V/div
OUTPUT 50mV/div
OUTPUT 500mV/div
OUTPUT 1V/div
RL = 1k 50ns/div
RL = 1k 50ns/div
RL = 1k 50ns/div
SMALL-SIGNAL PULSE RESPONSE
MAX4412 toc14
LARGE-SIGNAL PULSE RESPONSE
MAX4412 toc15
SMALL-SIGNAL PULSE RESPONSE (CL = 15pF)
MAX4412 toc16
INPUT 50mV/div
INPUT 500mV/div
INPUT 50mV/div
OUTPUT 50mV/div
OUTPUT 500mV/div
OUTPUT 50mV/div
RL = 150 50ns/div
RL = 150 50ns/div 50ns/div
MAX4412/MAX4413 CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY
MAX4412 toc17
MAX4413 CROSSTALK vs. FREQUENCY
-10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70
MAX4412 toc18
SMALL SIGNAL BANDWIDTH vs. LOAD RESISTANCE
MAX4412 toc19
1000
0
600 500 BANDWIDTH (MHz) 400 300 200 100 0
OUTPUT IMPEDANCE ()
100
10
1
-80 -90
0.1 100k 1M 10M FREQUENCY (Hz) 100M 1G
-100 100k 1M 10M FREQUENCY (Hz) 100M 1G
100 RLOAD ()
1000
6
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24, RL = 1k to VCC/2, CL = 5pF, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE SWING vs. LOAD RESISTANCE
MAX4412 toc21
OPEN-LOOP GAIN vs. LOAD RESISTANCE
MAX4412 toc20
POWER SUPPLY REJECTION vs. FREQUENCY
-10 -20 -30 PSR (dB) -40 -50 -60
MAX4412 toc22
140 120 OPEN-LOOP GAIN (dB) 100 80 60 40 20 0 100 1k RLOAD () 10k
450 400 OUTPUT VOLTAGE SWING (mV) 350 300 250 200 150 100 50 0 VOL 100 1k RLOAD () VOH
0
-70 -80 -90 -100 10k 100k 1M 10M FREQUENCY (Hz) 100M 1G
100k
COMMON-MODE REJECTION vs. FREQUENCY
MAX4412 toc23
VOLTAGE NOISE DENSITY vs. FREQUENCY
MAX4412 toc24
CURRENT NOISE DENSITY vs. FREQUENCY
MAX4412 toc25
-40 -50 -60 CMR (dB) -70 -80 -90 -100 100k 1M 10M FREQUENCY (Hz) 100M
1000 VOLTAGE NOISE DENSITY nV/Hz
100 CURRENT NOISE DENSITY pA/Hz
10
100
1
10 1G 1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
0 1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
HARMONIC DISTORTION vs. FREQUENCY
MAX4412 toc26
HARMONIC DISTORTION vs. OUTPUT VOLTAGE
MAX4412 toc27
HARMONIC DISTORTION vs. LOAD RESISTENCE
VOUT = 1Vp-p, f = 5MHz
MAX4412 toc28
0 -20 DISTORTION (dBc) -40 -60
VOUT = 1Vp-p
-60 -65 -70 DISTORTION (dBc)
f = 5MHz
0 -20 DISTORTION (dBc) -40 -60
-75 -80 -85 -90 2nd HARMONIC
2nd HARMONIC -80 -100 3rd HARMONIC -120 100K 1M 10M 100M FREQUENCY (Hz)
2nd HARMONIC -80 -100 3rd HARMONIC -120
-95 -100 0 0.5
3rd HARMONIC 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (Vp-p) 3.0 3.5
100
1K RLOAD ()
10K
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24, RL = 1k to VCC/2, CL = 5pF, TA = +25C, unless otherwise noted.)
ISOLATION RESISTANCE vs. CAPACITIVE LOAD
MAX4412 toc29
POWER-UP RESPONSE TIME
MAX4412 toc30
SUPPLY CURRENT (PER AMPLIFIER) vs. TEMPERATURE
+5V
2.5 SUPPLY CURRENT (mA) 2.0 1.5 1.0 0.5
MAX4412 toc31
30 28 26 24 RISO () 22 20 18 16 14 12 10 0 200 400 600 800
3.0
VSUPPLY 2.0V/div 0
+1.5V VOUT 750mV/div
0
0 -50 -25 0 25 50 75 100
1000
500ns/div
TEMPERATURE (C)
CLOAD (pF)
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4412 toc32
INPUT OFFSET CURRENT vs. TEMPERATURE
90 INPUT OFFSET CURRENT (nA) 80 70 60 50 40 30 20 10
MAX4412 toc33
3.0 2.5 INPUT BIAS CURRENT (A) 2.0 1.5 1.0 0.5 0 -50 -25 0 25 50 75
100
0 100 -50 -25 0 25 50 75 100 TEMPERATURE (C) TEMPERATURE (C)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4412 toc34
OUTPUT VOLTAGE SWING vs. TEMPERATURE
225 OUTPUT VOLTAGE SWING (mV) 200 175 150 125 100 75 50 25 0 VOL = VOUT - VEE VOH = VCC - VOUT
MAX4412 toc35
1.0 0.9 INPUT OFFSET VOLTAGE (mV) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -50 -25 0 25 50 75
250
100
-50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
8
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs
Pin Description
PIN MAX4412 1 2 3 4 5 MAX4413 1 7 4 3 5 2 6 8 NAME OUT OUTA OUTB VEE IN+ INA+ INB+ ININAINBVCC Amplifier Output Amplifier A Output Amplifier B Output Negative Power Supply Amplifier Noninverting Input Amplifier A Noninverting Input Amplifier B Noninverting Input Amplifier Inverting Input Amplifier A Inverting Input Amplifier B Inverting Input Positive Power Supply FUNCTION
MAX4412/MAX4413
Detailed Description
The MAX4412/MAX4413 single-supply, rail-to-rail, voltage-feedback amplifiers achieve 220V/s slew rates and 500MHz -3dB bandwidths, while consuming only 1.7mA of supply current per amplifier. Excellent harmonic distortion and differential gain/phase performance make these amplifiers an ideal choice for a wide variety of video and RF signal-processing applications. Internal feedback around the output stage ensures low open-loop output impedance, reducing gain sensitivity to load variations. This feedback also produces demand-driven current bias to the output transistors.
Rail-to-Rail Outputs, Ground-Sensing Input
The MAX4412/MAX4413 input common-mode range extends from (VEE - 0.1V) to (VCC - 1.5V) with excellent common-mode rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not undergo phase reversal or latchup. The output swings to within 105mV of either power-supply rail with a 1k load. Input ground sensing and railto-rail outputs substantially increase the dynamic range. With a symmetric input in a single +5V application, the input can swing 3.6Vp-p, and the output can swing 4.6Vp-p with minimal distortion.
produce excessive ringing and oscillation. The use of an isolation resistor eliminates this problem (Figure 1). Figure 2 is a graph of the Optimal Isolation Resistor (RISO) vs. Capacitive Load. The Small Signal Gain vs. Frequency with Capacitive Load and No Isolation Resistor graph in the Typical Operating Characteristics shows how a capacitive load causes excessive peaking of the amplifier's frequency response if the capacitor is not isolated from the amplifier by a resistor. A small isolation resistor (usually 20 to 30) placed before the reactive load prevents ringing and oscillation. At higher capacitive loads, AC performance is controlled by the interaction of the load capacitance and the isolation resistor. The Small-Signal Gain vs. Frequency with Capacitive Load and 22 Isolation Resistor graph shows the effect of a 22 isolation resistor on closed-loop response. Coaxial cable and other transmission lines are easily driven when properly terminated at both ends with their characteristic impedance. Driving back-terminated transmission lines essentially eliminates the line's capacitance.
___________Applications Information
Choosing Resistor Values
Unity-Gain Configuration The MAX4412/MAX4413 are internally compensated for unity gain. When configured for unity gain, the devices require a 24 feedback resistor (R F ). This resistor improves AC response by reducing the Q of the parallel LC circuit formed by the parasitic feedback capacitance and inductance.
9
Output Capacitive Loading and Stability
The MAX4412/MAX4413 are optimized for AC performance. They are not designed to drive highly reactive loads. Such loads decrease phase margin and may
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
Inverting and Noninverting Configurations Select the gain-setting feedback (RF) and input (RG) resistor values that best fit the application. Large resistor values increase voltage noise and interact with the amplifier's input and PC board capacitance. This can generate undesirable poles and zeros and decrease bandwidth or cause oscillations. For example, a noninverting gain-of-two configuration (RF = RG) using 1k resistors, combined with 1.8pF of amplifier input capacitance and 1pF of PC board capacitance, causes a pole at 114MHz. Since this pole is within the amplifier bandwidth, it jeopardizes stability. Reducing the 1k resistors to 100 extends the pole frequency to 1.14GHz, but could limit output swing by adding 200 in parallel with the amplifier's load resistor. Note: For high-gain applications where output offset voltage is a consideration, choose RS to be equal to the parallel combination of RF and RG (Figures 3a and 3b):
RG RF
RS =
RF x RG RF + RG
Video Line Driver
The MAX4412/MAX4413 are designed to minimize differential gain error and differential phase error to 0.01%/ 0.03 respectively, making them ideal for driving video loads.
Active Filters
The low distortion and high bandwidth of the MAX4412/MAX4413 make them ideal for use in active filter circuits. Figure 4 is a 15MHz lowpass, multiplefeedback active filter using the MAX4412. GAIN = R2 R1
RISO VOUT VIN RBIN RS IN VOUT = [1+ (RF / RG)] VIN R0 CL VOUT RG RF
Figure 1. Driving a Capacitive Load Through an Isolation Resistor
ISOLATION RESISTANCE vs. CAPACITIVE LOAD
28 26 24 RISO () 22 20 18 16 14 12 10 0 200 400 600 800 1000 CLOAD (pF)
RS VOUT = (RF / RG) VIN RO VOUT
MAX4412 toc29
Figure 3a. Noninverting Gain Configuration
30
RG IN
RF
Figure 2. Isolation Resistance vs. Capacitive Load 10
Figure 3b. Inverting Gain Configuration
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs
Layout and Power-Supply Bypassing
f0 1 = x 2 1 R2 x R3 x C1 x C2 C2 Q= C1 x C2 x R2 x R3 1 1 1 + + R1 R2 R3 These amplifiers operate from a single +2.7V to +5.5V power supply. Bypass V CC to ground with a 0.1F capacitor as close to the pin as possible. Maxim recommends using microstrip and stripline techniques to obtain full bandwidth. Design the PC board for a frequency greater than 1GHz to prevent amplifier performance degradation due to board parasitics. Avoid large parasitic capacitances at inputs and outputs. Whether or not a constant-impedance board is used, observe the following guidelines: * Do not use wire-wrap boards due to their high inductance. * Do not use IC sockets because of the increased parasitic capacitance and inductance. * Use surface-mount instead of through-hole components for better high-frequency performance. * Use a PC board with at least two layers; it should be as free from voids as possible. * Keep signal lines as short and as straight as possible. Do not make 90 turns; round all corners.
MAX4412/MAX4413
ADC Input Buffer
Input buffer amplifiers can be a source of significant errors in high-speed analog-to-digital converter (ADC) applications. The input buffer is usually required to rapidly charge and discharge the ADC's input, which is often capacitive (see Output Capacitive Loading and Stability). In addition, since a high-speed ADC's input impedance often changes very rapidly during the conversion cycle, measurement accuracy must 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 MAX4412/ MAX4413 ideally suited for use as buffer amplifiers in high-speed ADC applications.
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
+5.0V R2 150 R1 150 VIN VOUT C1 100pF R3 511 C2 15pF 10k
MAX4412
10k
Figure 4. Multiple-Feedback Lowpass Filter
_
Chip Information
MAX4412 TRANSISTOR COUNT: 99 MAX4413 TRANSISTOR COUNT: 192 PROCESS: Bipolar
12
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs
Package Information
SC70, 5L.EPS
MAX4412/MAX4413
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13
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs MAX4412/MAX4413
Package Information (continued)
SOT5L.EPS
14
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Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs
Package Information (continued)
SOT23, 8L.EPS
MAX4412/MAX4413
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.
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