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19-1246; Rev 0; 7/97
Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs
_______________General Description
The MAX4012 single, MAX4016 dual, MAX4018 triple, and MAX4020 quad op amps are unity-gain-stable devices that combine high-speed performance with Rail-to-Rail(R) outputs. The MAX4018 has a disable feature that reduces power-supply current to 400A and places its outputs into a high-impedance state. These devices operate from a +3.3V to +10V single supply or from 1.65V to 5V dual supplies. The common-mode input voltage range extends beyond the negative power-supply rail (ground in single-supply applications). These devices require only 5.5mA of quiescent supply current while achieving a 200MHz -3dB bandwidth and a 600V/s slew rate. These parts are an excellent solution in low-power/low-voltage systems that require wide bandwidth, such as video, communications, and instrumentation. In addition, when disabled, their high output impedance makes them ideal for multiplexing applications. The MAX4012 comes in a miniature 5-pin SOT23 package, while the MAX4016 comes in 8-pin MAX and SO packages. The MAX4018/MAX4020 are available in a space-saving 16-pin QSOP, as well as a 14-pin SO.
____________________________Features
o Low-Cost o High Speed: 200MHz -3dB Bandwidth (MAX4012) 150MHz -3dB Bandwidth (MAX4016/18/20) 30MHz 0.1dB Gain Flatness 600V/s Slew Rate o Single 3.3V/5.0V Operation o Rail-to-Rail Outputs o Input Common-Mode Range Extends Beyond VEE o Low Differential Gain/Phase: 0.02%/0.02 o Low Distortion at 5MHz: -78dBc SFDR -75dB Total Harmonic Distortion o High Output Drive: 120mA o 400A Shutdown Capability (MAX4018) o High Output Impedance in Off State (MAX4018) o Space-Saving SOT23-5, MAX, or QSOP Packages
MAX4012/MAX4016/MAX4018/MAX4020
________________________Applications
Set-Top Boxes Surveillance Video Systems Battery-Powered Instruments Video Line Driver Analog-to-Digital Converter Interface CCD Imaging Systems Video Routing and Switching Systems
______________Ordering Information
PART MAX4012EUK MAX4016ESA MAX4016EUA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SOT23-5 8 SO 8 MAX SOT TOP MARK ABZP -- --
Ordering Information continued at end of data sheet.
__________Typical Operating Circuit
RF 24 RTO 50
_________________Pin Configurations
TOP VIEW
OUT 1 5 VCC
VOUT ZO = 50 RO 50 IN+ 3 VEE 2
MAX4012
MAX4012
IN RTIN 50
4
IN-
UNITY-GAIN LINE DRIVER (RL = RO + RTO)
SOT23-5 Pin Configurations continued at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468.
Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE)................................................+12V IN_-, IN_+, OUT_, EN_ .....................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration to VCC or VEE ............. Continuous Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C) ...........571mW 8-Pin SO (derate 5.9mW/C above +70C) .................471mW 8-Pin MAX (derate 4.1mW/C above +70C) ............330mW 14-Pin SO (derate 8.3mW/C above +70C) ...............667mW 16-Pin QSOP (derate 8.3mW/C above +70C) ..........667mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+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 at 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 = 0V, EN_ = +5V, RL = are at TA = +25C.) (Note 1) PARAMETER Input Common-Mode Voltage Range Input Offset Voltage (Note 2) Input Offset Voltage Temperature Coefficient Input Offset Voltage Matching Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Open-Loop Gain (Note 2) IB IOS RIN CMRR AVOL SYMBOL VCM VOS TCVOS
to VCC / 2, VOUT = VCC / 2, TA = TMIN to TMAX, unless otherwise noted. Typical values
CONDITIONS Guaranteed by CMRR test MIN VEE 0.20 4 8 Any channels for MAX4016/MAX4018/ MAX4020 (Note 2) (Note 2) Differential mode (-1V VIN +1V) Common mode (-0.2V VCM +2.75V) (VEE - 0.2V) VCM (VCC - 2.25V) 0.25V VOUT 4.75V, RL = 2k 0.5V VOUT 4.5V, RL = 150 1.0V VOUT 4V, RL = 50 RL = 2k RL = 150 VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE 100 52 70 1 5.4 0.1 70 3 100 61 59 57 0.06 0.06 0.30 0.30 0.6 0.6 1.1 0.05 120 150 8 1.5 1.5 2.0 0.50 mA mA V dB 20 20 TYP MAX VCC 2.25 20 UNITS V mV V/C mV A A k M dB
Output Voltage Swing (Note 2)
VOUT RL = 75 RL = 75 to ground
Output Current Output Short-Circuit Current Open-Loop Output Resistance
IOUT ISC ROUT
RL = 20 to VCC or VEE Sinking or sourcing
2
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0V, EN_ = +5V, RL = are at TA = +25C.) (Note 1) PARAMETER Power-Supply Rejection Ratio (Note 3) Operating Supply-Voltage Range Disabled Output Resistance EN_ Logic-Low Threshold EN_ Logic-High Threshold EN_ Logic Input Low Current EN_ Logic Input High Current Quiescent Supply Current (per Amplifier)
MAX4012/MAX4016/MAX4018/MAX4020
to VCC / 2, VOUT = VCC / 2, TA = TMIN to TMAX, unless otherwise noted. Typical values
CONDITIONS VCC = 5V, VEE = 0V, VCM = +2.0V VCC = 5V, VEE = -5V, VCM = 0V VCC = 3.3V, VEE = 0V, VCM = +0.90V MIN 46 54 TYP 57 66 45 3.15 28 VCC - 1.6 (VEE + 0.2V) EN_ VCC EN_ = 0V EN_ = 5V Enabled MAX4018, disabled (EN_ = 0V) 0.5 200 0.5 5.5 0.40 300 10 7.0 0.55 35 VCC - 2.6 11.0 V k V V A A mA dB MAX UNITS
SYMBOL PSRR
VS ROUT (OFF) VIL VIH IIL IIH IS
VCC to VEE EN_ = 0V, 0V VOUT 5V (Note 4)
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0V, VCM = 2.5V, EN_ = +5V, RF = 24, RL = 100 to VCC / 2, VOUT = VCC / 2, AVCL = +1, TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Large-Signal -3dB Bandwidth Bandwidth for 0.1dB Gain Flatness Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range SYMBOL BWSS BWLS BW0.1dB SR tS tR, tF SFDR CONDITIONS MAX4012 VOUT = 20mVp-p VOUT = 2Vp-p VOUT = 20mVp-p (Note 5) VOUT = 2V step VOUT = 2V step VOUT = 100mVp-p fC = 5MHz, VOUT = 2Vp-p 2nd harmonic Harmonic Distortion HD fC = 5MHz, VOUT = 2Vp-p 3rd harmonic Total harmonic distortion 6 MAX4016/MAX4018/ MAX4020 MIN TYP 200 150 140 30 600 45 1 -78 -78 -82 -75 35 11 0.02 0.02 10 6 1 MAX4018, EN_ = 0V f = 10MHz MAX4018 MAX4018 MAX4016/MAX4018/MAX4020, f = 10MHz, VOUT = 20mVp-p XTALK MAX4016/MAX4018/MAX4020, f = 10MHz, VOUT = 2Vp-p, RS = 50 to ground 2 6 100 1 0.1 -95 MHz MHz MHz V/s ns ns dBc dBc dB dBc dBm degrees % nV/Hz pA/Hz pF pF ns s dB dB MAX UNITS
Two-Tone, Third-Order Intermodulation Distortion Input 1dB Compression Point Differential Phase Error Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance Disabled Output Capacitance Output Impedance Amplifier Enable Time Amplifier Disable Time Amplifier Gain Matching Amplifier Crosstalk
IP3
f1 = 10.0MHz, f2 = 10.1MHz, VOUT = 1Vp-p fC = 10MHz, AVCL = +2
DP DG en in CIN COUT (OFF) ZOUT tON tOFF
NTSC, RL = 150 NTSC, RL = 150 f = 10kHz f = 10kHz
Note 1: The MAX4012EUT is 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 2: Tested with VCM = +2.5V. Note 3: PSR for single +5V supply tested with VEE = 0V, VCC = +4.5V to +5.5V; for dual 5V supply with VEE = -4.5V to -5.5V, VCC = +4.5V to +5.5V; and for single +3.3V supply with VEE = 0V, VCC = +3.15V to +3.45V. Note 4: Does not include the external feedback network's impedance. Note 5: Guaranteed by design.
4
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = 0V, AVCL = +1, RF = 24, RL = 100 to VCC / 2, TA = +25C, unless otherwise noted.)
MAX4012 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +1)
MAX4012-01
MAX4012/MAX4016/MAX4018/MAX4020
MAX4016/18/20 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +1)
MAX4012-02
MAX4012 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2)
8 7 6 GAIN (dB) 5 4 3 2 1 0 -1 AVCL = +2 VOUT = 20mVp-p
MAX4012-03
4 3 2 1 GAIN (dB) AVCL = +1 VOUT = 20mVp-p
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 -7 AVCL = +1 VOUT = 20mVp-p
9
0 -1 -2 -3 -4 -5 -6 100k 1M 10M FREQUENCY (Hz) 100M 1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
MAX4016/18/20 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2)
MAX4012-04
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4012-05
MAX4012 GAIN FLATNESS vs. FREQUENCY
0.6 0.5 0.4 GAIN (dB) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 AVCL = +1 VOUT = 20mVp-p
MAX4012-06
9 8 7 6 GAIN (dB) AVCL = +2 VOUT = 20mVp-p
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 2Vp-p VOUT BIAS = 1.75V
0.7
5 4 3 2 1 0 -1 100k 1M 10M FREQUENCY (Hz) 100M 1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
0.1M
1M
10M FREQUENCY (Hz)
100M
1G
MAX4016/18/20 GAIN FLATNESS vs. FREQUENCY
MAX4012-07
MAX4016/18/20 CROSSTALK vs. FREQUENCY
MAX4212-08
CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY
MAX4012-09
0.5 0.4 0.3 0.2 GAIN (dB) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0.1M 1M 10M FREQUENCY (Hz) 100M AVCL = +1 VOUT = 20mVp-p
50 30 10 CROSSTALK (dB) RS = 50
1000
100 IMPEDANCE () 100k 1M 10M FREQUENCY (Hz) 100M 1G
-10 -30 -50 -70 -90 -110 -130 -150
10
1
0.1 0.1M 1M 10M 100M FREQUENCY (Hz)
1G
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, AVCL = +1, RF = 24, RL = 100 to VCC / 2, TA = +25C, unless otherwise noted.)
HARMONIC DISTORTION vs. FREQUENCY (AVCL = +1)
MAX4012-10
HARMONIC DISTORTION vs. FREQUENCY (AVCL = +2)
MAX4012-11
HARMONIC DISTORTION vs. FREQUENCY (AVCL = +5)
-10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 2ND HARMONIC 3RD HARMONIC VOUT = 2Vp-p AVCL = +5
MAX4012-12
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 100k 1M 10M 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p AVCL = +1
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 2ND HARMONIC VOUT = 2Vp-p AVCL = +2
0
3RD HARMONIC
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
HARMONIC DISTORTION vs. LOAD
MAX4012-13
HARMONIC DISTORTION vs. OUTPUT SWING
MAX4012-14
DIFFERENTIAL GAIN AND PHASE
DIFF. GAIN (%) 0.02 0.01 0.00 -0.01 0 DIFF. PHASE (deg) 0.03 0.02 0.01 0.00 -0.01 0 IRE 100 IRE VCM = +1.35V 100 VCM = +1.35V
MAX4012-15
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 0 200 400 600 LOAD () 800 3rd HARMONIC 2rd HARMONIC f = 5MHz VOUT = 2Vp-p
0 -10 HARMONIC DISTORTION (dBc) -20 -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 0.5 1.0 1.5 OUTPUT SWING (Vp-p) 2ND HARMONIC fO = 5MHz
0.03
1000
2.0
COMMON-MODE REJECTION vs. FREQUENCY
MAX4012-16
POWER-SUPPLY REJECTION vs. FREQUENCY
MAX4012-17
OUTPUT SWING vs. LOAD RESISTANCE
RL to VCC/2 4.0 OUTPUT SWING (Vp-p) 3.5 3.0 2.5 2.0 1.5 1.0 RL to GROUND
MAX4012-18
0 -10 -20 -30 CMR (dB) -40 -50 -60 -70 -80 -90 -100 100k 1M 10M FREQUENCY (Hz) 100M
20 10 POWER-SUPPLY REJECTION (dB) 0 -10 -20 -30 -40 -50 -60 -70 -80 100k 1M 10M FREQUENCY (Hz) 100M
4.5
AVCL = +2 25 50 75 100 125 LOAD RESISTANCE () 150
6
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, AVCL = +1, RF = 24, RL = 100 to VCC / 2, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE (AVCL = +1)
MAX4012-19
SMALL-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4012-20
SMALL-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = +1)
MAX4012-21
IN (50mV/ div) VOLTAGE
IN (25mV/ div) VOLTAGE
IN (50mV/ div) VOLTAGE OUT (25mV/ div) TIME (20ns/div) VCM = +1.25V, RL = 100 to GROUND
OUT (25mV/ div)
OUT (25mV/ div)
TIME (20ns/div) VCM = +2.5V, RL = 100 to GROUND
TIME (20ns/div) VCM = +1.75V, RL = 100 to GROUND
LARGE-SIGNAL PULSE RESPONSE (AVCL = +1)
MAX4012-22
LARGE-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4012-23
LARGE-SIGNAL PULSE RESPONSE (CL = 5pF, AVCL = +2)
MAX4012-24
IN (1V/div) VOLTAGE
IN (500mV/ div) VOLTAGE VOLTAGE
IN (1V/ div)
OUT (1V/div)
OUT (500mV/ div)
OUT (500mV/ div)
TIME (20ns/div) VCM = +1.75V, RL = 100 to GROUND
TIME (20ns/div) VCM = 0.9V, RL = 100 to GROUND
TIME (20ns/div) VCM = +1.75V, RL = 100 to GROUND
VOLTAGE-NOISE DENSITY vs. FREQUENCY
MAX4012-25
CURRENT-NOISE DENSITY vs. FREQUENCY
MAX4012-26
ENABLE RESPONSE TIME
MAX4012-27
100
10
5.0V (ENABLE) EN_
NOISE (nV/Hz)
NOISE (pA/Hz)
0V (DISABLE)
10
OUT
1V
0V 1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 1 1 10 100 1k 10k 100k 1M 10M VIN = +1.0V TIME (1s/div) FREQUENCY (Hz)
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, AVCL = +1, RF = 24, RL = 100 to VCC / 2, TA = +25C, unless otherwise noted.)
OPEN-LOOP GAIN vs. LOAD RESISTANCE
MAX4012-28
CLOSED-LOOP BANDWIDTH vs. LOAD RESISTANCE
MAX4012-29
OFF ISOLATION vs. FREQUENCY
0 -10 OFF ISOLATION (dB) -20 -30 -40 -50 -60 -70
MAX4012-30
70
400 CLOSED-LOOP BANDWIDTH (MHz) 350 300 250 200 150 100 50
10
60 OPEN-LOOP GAIN (dB)
50
40
30
-80 -90 0 100 200 300 400 500 LOAD RESISTANCE () 600 100k 1M 10M FREQUENCY (Hz) 100M
20 0 200 400 600 800 LOAD RESISTANCE () 1k
0
SUPPLY CURRENT vs. TEMPERATURE
MAX4012-31
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4012-32
INPUT OFFSET CURRENT vs. TEMPERATURE
MAX4012-33
7
6.0
0.20
SUPPLY CURRENT (mA)
6
5.5
INPUT OFFSET CURRENT (A)
INPUT BIAS CURRENT (A)
0.16
0.12
5
5.0
0.08
4
4.5
0.04
3 -50 -25 0 25 50 TEMPERATURE (C) 75 100
4.0 -50 -25 0 25 50 TEMPERATURE (C) 75 100
0 -50 -25 0 25 50 TEMPERATURE (C) 75 100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4012-34
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4012-35
OUTPUT VOLTAGE SWING vs. TEMPERATURE
RL = 150 TO VCC / 2 4.8 VOLTAGE SWING (Vp-p)
MAX4012-36
10 8 SUPPLY CURRENT (mA)
5
5.0
6
INPUT OFFSET VOLTAGE (mV)
4
3
4.6
4
2
4.4
2
1
4.2
0 3 4 5 6 7 8 9 SUPPLY VOLTAGE (V) 10 11
0 -50 -25 0 25 50 TEMPERATURE (C) 75 100
4.0 -50 -25 0 25 50 TEMPERATURE (C) 75 100
8
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs
______________________________________________________________Pin Description
PIN MAX4012 SOT23-5 -- 1 2 3 4 5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- MAX4016 SO/MAX -- -- 4 -- -- 8 1 2 3 7 6 5 -- -- -- -- -- -- -- -- -- -- SO -- -- 11 -- -- 4 7 6 5 8 9 10 14 13 12 -- -- -- -- 1 3 2 PIN MAX4018 QSOP 8, 9 -- 13 -- -- 4 7 6 5 10 11 12 16 15 14 -- -- -- -- 1 3 2 SO -- -- 11 -- -- 4 1 2 3 7 6 5 8 9 10 14 13 12 -- -- -- -- MAX4020 QSOP 8, 9 -- 13 -- -- 4 1 2 3 7 6 5 10 11 12 16 15 14 -- -- -- -- N.C. OUT VEE IN+ INVCC OUTA INAINA+ OUTB INBINB+ OUTC INCINC+ OUTD INDIND+ EN ENA ENB ENC No Connect. Not internally connected. Tie to ground or leave open. Amplifier Output Negative Power Supply or Ground (in single-supply operation) Noninverting Input Inverting Input Positive Power Supply Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Amplifier B Output Amplifier B Inverting Input Amplifier B Noninverting Input Amplifier C Output Amplifier C Inverting Input Amplifier C Noninverting Input Amplifier D Output Amplifier D Inverting Input Amplifier D Noninverting Input Enable Amplifier Enable Amplifier A Enable Amplifier B Enable Amplifier C NAME FUNCTION
MAX4012/MAX4016/MAX4018/MAX4020
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9
Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
_______________Detailed Description
The MAX4012/MAX4016/MAX4018/MAX4020 are single-supply, rail-to-rail, voltage-feedback amplifiers that employ current-feedback techniques to achieve 600V/s slew rates and 200MHz bandwidths. 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. The output voltage swing comes to within 50mV of each supply rail. Local feedback around the output stage assures low open-loop output impedance to reduce gain sensitivity to load variations. This feedback also produces demand-driven current bias to the output transistors for 120mA drive capability, while constraining total supply current to less than 7mA. The input stage permits common-mode voltages beyond the negative supply and to within 2.25V of the positive supply rail. cuit formed by the parasitic feedback capacitance and inductance.
__________Applications Information
Choosing Resistor Values
Unity-Gain Configuration The MAX4012/MAX4016/MAX4018/MAX4020 are internally compensated for unity gain. When configured for unity gain, the devices require a 24 resistor (RF) in series with the feedback path. This resistor improves AC response by reducing the Q of the parallel LC cir-
Inverting and Noninverting Configurations Select the gain-setting feedback (RF) and input (RG) resistor values to fit your 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 1pF of amplifier input capacitance and 1pF of PC board capacitance, causes a pole at 159MHz. Since this pole is within the amplifier bandwidth, it jeopardizes stability. Reducing the 1k resistors to 100 extends the pole frequency to 1.59GHz, but could limit output swing by adding 200 in parallel with the amplifier's load resistor. Table 1 shows suggested feedback, gain resistors, and bandwidth for several gain values in the configurations shown in Figures 1a and 1b.
Layout and Power-Supply Bypassing
These amplifiers operate from a single +3.3V to +11V power supply or from dual supplies to 5.5V. For singlesupply operation, bypass VCC to ground with a 0.1F capacitor as close to the pin as possible. If operating with dual supplies, bypass each supply with a 0.1F capacitor.
RG
RF IN RTO
MAX40_ _
RG
RF
VOUT
RTIN
MAX40_ _
RTO
VOUT
IN RTIN
VOUT = [1+ (RF / RG)] VIN
RO RS
VOUT = -(RF / RG) VIN
RO
Figure 1a. Noninverting Gain Configuration
Figure 1b. Inverting Gain Configuration
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs
Maxim recommends using microstrip and stripline techniques to obtain full bandwidth. To ensure that the PC board does not degrade the amplifier's performance, design it for a frequency greater than 1GHz. Pay careful attention to inputs and outputs to avoid large parasitic capacitance. Whether or not you use a constantimpedance board, observe the following guidelines when designing the board: * Don't use wire-wrap boards because they are too inductive. * Don't use IC sockets because they increase 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. The output swings to within 60mV of either powersupply rail with a 2k load. The input ground-sensing and the rail-to-rail output substantially increase the dynamic range. With a symmetric input in a single +5V application, the input can swing 2.95Vp-p, and the output can swing 4.9Vp-p with minimal distortion.
MAX4012/MAX4016/MAX4018/MAX4020
Enable Input and Disabled Output
The enable feature (EN_) allows the amplifier to be placed in a low-power, high-output-impedance state. Typically, the EN_ logic low input current (IIL) is small. However, as the EN voltage (VIL) approaches the negative supply rail, IIL increases (Figure 2). A single resistor connected as shown in Figure 3 prevents the rise in the logic-low input current. This resistor provides a feedback mechanism that increases VIL as the logic input is brought to VEE. Figure 4 shows the resulting input current (IIL). When the MAX4018 is disabled, the amplifier's output impedance is 35k. This high resistance and the low 2pF output capacitance make this part ideal in RF/video multiplexer or switch applications. For larger arrays, pay careful attention to capacitive loading. See the Output Capacitive Loading and Stability section for more information.
Rail-to-Rail Outputs, Ground-Sensing Input
The input common-mode range extends from (VEE - 200mV) to (VCC - 2.25V) with excellent commonmode rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not undergo phase reversal or latchup.
Table 1. Recommended Component Values
GAIN (V/V) COMPONENT +1 RF () RG () RS () RTIN () RTO () Small-Signal -3dB Bandwidth (MHz) 24 -- 49.9 49.9 200 -1 500 500 0 56 49.9 90 +2 500 500 -- 49.9 49.9 105 -2 500 250 0 62 49.9 60 +5 500 124 -- 49.9 49.9 25 -5 500 100 0 100 49.9 33 +10 500 56 -- 49.9 49.9 11 -10 500 50 0 49.9 25 +25 500 20 -- 49.9 49.9 6 -25 1200 50 0 49.9 10
Note: RL = RO + RTO; RTIN and RTO are calculated for 50 applications. For 75 systems, RTO = 75; calculate RTIN from the following equation:
R TIN =
75 75 1RG
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11
Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
20 0 -20 INPUT CURRENT (A) -40 -60 -80 IN+ -100 -120 -140 -160 0 50 100 150 200 250 300 350 400 450 500 mV ABOVE VEE
MAX40_ _
ENABLE
10k INEN_ OUT
Figure 3. Circuit to Reduce Enable Logic-Low Input Current
Figure 2. Enable Logic-Low Input Current vs. VIL
0 -1 -2 INPUT CURRENT (A) -3 -4 -5 -6 -7 -8 -9 -10 0 50 100 150 200 250 300 350 400 450 500 mV ABOVE VEE
To implement the mux function, the outputs of multiple amplifiers can be tied together, and only the amplifier with the selected input will be enabled. All of the other amplifiers will be placed in the low-power shutdown mode, with their high output impedance presenting very little load to the active amplifier output. For gains of +2 or greater, the feedback network impedance of all the amplifiers used in a mux application must be considered when calculating the total load on the active amplifier output
Output Capacitive Loading and Stability
The MAX4012/MAX4016/MAX4018/MAX4020 are optimized for AC performance. They are not designed to drive highly reactive loads, which decreases phase margin and may produce excessive ringing and oscillation. Figure 5 shows a circuit that eliminates this problem. Figure 6 is a graph of the optimal isolation resistor (RS) vs. capacitive load. Figure 7 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. Figure 8 shows the effect of a 27 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.
Figure 4. Enable Logic-Low Input Current vs. VIL with 10k Series Resistor
12
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
30 ISOLATION RESISTANCE, RISO () 25 20 15 10 5 0 0 50 100 150 200 CAPACITIVE LOAD (pF) 250
RG
RF
RISO
MAX40_ _
VOUT CL
VIN RTIN 50
Figure 5. Driving a Capacitive Load through an Isolation Resistor
Figure 6. Capacitive Load vs. Isolation Resistance
6 5 4 3 GAIN (dB) GAIN (dB) 2 1 0 -1 -2 -3 -4 100k 1M 10M FREQUENCY (Hz) 100M 1G CL = 5pF CL = 10pF CL = 15pF
3 2 1 0 -1 -2 -3 -4 -5 -6 -7 100k 1M 10M FREQUENCY (Hz) 100M 1G CL = 68pF CL = 120pF RISO = 27 CL = 47pF
Figure 7. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor
Figure 8. Small-Signal Gain vs. Frequency with Load Capacitance and 27 Isolation Resistor
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13
Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
_____________________________________________Pin Configurations (continued)
TOP VIEW
ENA 1 ENC 2 ENB 3 VCC 4 INA+ 5 INA- 6 OUTA 7
14 OUTC 13 INC12 INC+
OUTA 1 INA- 2 INA+ 3 VCC 4 INB+ 5 INB- 6 OUTB 7
14 OUTD 13 IND12 IND+
MAX4018
11 VEE 10 INB+ 9 8 INBOUTB
MAX4020
11 VEE 10 INC+ 9 8 INCOUTC
SO
OUTA 1 INA2
8 7
VCC OUTB INBINB+
SO
INA+ 3 VEE 4
MAX4016
6 5
ENA 1 ENC 2 ENB 3 VCC 4 INA+ 5 INA- 6 OUTA 7 N.C. 8
16 OUTC 15 INC14 INC+
SO/MAX
OUTA 1 INA- 2 INA+ 3 VCC 4 INB+ 5 INB- 6 OUTB 7 N.C. 8
16 OUTD 15 IND14 IND+
MAX4018
13 VEE 12 INB+ 11 INB10 OUTB 9 N.C.
MAX4020
13 VEE 12 INC+ 11 INC10 OUTC 9 N.C.
QSOP
QSOP
14
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Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs
_Ordering Information (continued)
PART MAX4018ESD MAX4018EEE MAX4020ESD MAX4020EEE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 14 SO 16 QSOP 14 SO 16 QSOP SOT TOP MARK -- -- -- --
___________________Chip Information
PART MAX4012 MAX4016 MAX4018 MAX4020 TRANSISTOR COUNT 95 190 299 362
MAX4012/MAX4016/MAX4018/MAX4020
________________________________________________________Package Information
SOT5L.EPS
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15
Low-Cost, High-Speed, SOT23, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4012/MAX4016/MAX4018/MAX4020
___________________________________________Package Information (continued)
8LUMAXD.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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
QSOP.EPS

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