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19-1989; Rev 0; 3/01
Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs
General Description
The MAX4350 single and MAX4351 dual op amps are unity-gain-stable devices that combine high-speed performance with Rail-to-Rail(R) outputs. Both devices operate from dual 5V supplies. The common-mode input voltage range extends to the negative power-supply rail. The MAX4350/MAX4351 require only 6.9mA of quiescent supply current per op amp while achieving a 210MHz -3dB bandwidth and a 485V/s slew rate. Both devices are excellent solutions in low-power systems that require wide bandwidth, such as video, communications, and instrumentation. The MAX4350 is available in an ultra-small 5-pin SC70 package and the MAX4351 is available in a spacesaving 8-pin SOT23 package.
Features
o Ultra-Small 5-Pin SC70, 5-Pin SOT23, and 8-Pin SOT23 Packages o Low Cost o High Speed 210MHz -3dB Bandwidth 55MHz 0.1dB Gain Flatness 485V/s Slew Rate o Rail-to-Rail Outputs o Input Common-Mode Range Extends to VEE o Low Differential Gain/Phase: 0.02%/0.08 o Low Distortion at 5MHz -65dBc SFDR -63dB Total Harmonic Distortion
MAX4350/MAX4351
Applications
Set-Top Boxes Surveillance Video Systems Video Line Drivers Analog-to-Digital Converter Interface CCD Imaging Systems Video Routing and Switching Systems Digital Cameras
Ordering Information
PART MAX4350EXK-T MAX4350EUK-T MAX4351EKA-T MAX4351ESA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SC70-5 5 SOT23-5 8 SOT23-8 8 SO TOP MARK ACF ADRA AAIC --
Typical Operating Circuit
RF 24 RTO 75 MAX4350 IN RTIN 75 UNITY-GAIN LINE DRIVER (RL = RO + RTO) ZO = 75 RO 75
Pin Configurations
TOP VIEW
OUT 1 5 VCC
VOUT
VEE 2
MAX4350
IN+ 3
4
IN-
SC70-5/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 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-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs MAX4350/MAX4351
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE)................................................+12V IN_-, IN_+, OUT_..............................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Current to VCC or VEE ......................150mA Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 2.5mW/C above +70C) .............200mW 5-Pin SOT23 (derate 7.1mW/C above +70C) ...........571mW 8-Pin SOT23 (derate 5.26mW/C above +70C) .........421mW 8-Pin SO (derate 5.9mW/C above +70C) .................471mW Operating Temperature Range ...........................-40C to +85C 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 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.
(VCC = +5V, VEE = -5V, RL = to 0, VOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Common-Mode Voltage Range Input Offset Voltage Input Offset Voltage Matching Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Open-Loop Gain TCVOS IB IOS RIN CMRR AVOL Differential mode (-1V VIN +1V) Common mode (-5V VCM +2.75V) VEE VCM (VCC - 2.25V) -4.5V VOUT +4.5V, RL = 2k -4.25V VOUT +4.25V, RL = 150 -3.75V VOUT +3.75V, RL = 75 RL = 2k Output Voltage Swing VOUT RL = 150 RL = 75 Output Current Output Short-Circuit Current Open-Loop Output Resistance Power-Supply Rejection Ratio Operating Supply-Voltage Range Quiescent Supply Current (Per Amplifier) IOUT ISC ROUT PSRR VS IS VS = 4.5V to 5.5V VCC, VEE 52 4.5 6.9 RL = 50 Sinking or sourcing VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE Sourcing Sinking 55 40 70 50 48 SYMBOL VCM VOS MAX4351 only CONDITIONS Guaranteed by CMRR test MIN VEE 1 1 8 7.5 0.5 70 3 95 60 58 57 0.125 0.065 0.525 0.370 0.925 0.750 80 75 120 8 66 5.5 9.0 0.350 0.170 0.750 0.550 1.550 1.7 mA mA dB V mA V dB 20 4 TYP MAX VCC 2.25 26 UNITS V mV mV V/C A A k M dB
DC ELECTRICAL CHARACTERISTICS
2
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Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs MAX4350/MAX4351
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = -5V, VCM = 0, RF = 24, RL = 100 to 0, AVCL = +1V/V, 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 VOUT = 2Vp-p VOUT = 100mVp-p VOUT = 2Vp-p 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 CONDITIONS VOUT = 100mVp-p MIN TYP 210 175 55 40 485 16 4 -65 -65 -58 -63 66 102 14 0.08 0.02 10 1.8 1 f = 10MHz 1.5 dBc dB dBm degrees % nV/Hz pA/Hz pF dBc MAX UNITS MHz MHz MHz V/s ns ns dBc
Two-Tone, Third-Order Intermodulation Distortion Channel-to-Channel Isolation Input 1dB Compression Point Differential Phase Error Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance Output Impedance
IP3 CHISO DP DG eN iN CIN ZOUT
f1 = 4.7MHz, f2 = 4.8MHz, VOUT = 1Vp-p Specified at DC, MAX4351 only fC = 10MHz, AVCL = +2V/V NTSC, RL = 150 NTSC, RL = 150 f = 10kHz f = 10kHz
Note 1: All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design.
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3
Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs MAX4350/MAX4351
Typical Operating Characteristics
(VCC = +5V, VEE = -5V, VCM = 0, AVCL = +1V/V, RF = 24, RL = 100 to 0, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4350-01
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4350-02
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 VOUT = 100mVp-p
MAX4350-03
4 3 2 1 GAIN (dB) VOUT = 100mVp-p
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 2Vp-p
0.4
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
GAIN FLATNESS vs. FREQUENCY
MAX4350 toc04
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4350-05
DISTORTION vs. FREQUENCY
-10 -20 VOUT = 2Vp-p AVCL = +1V/V
MAX4350-06
0.4 0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 100k 1M 10M FREQUENCY (Hz) 100M VOUT = 2Vp-p
100
0
10 DISTORTION (dBc) IMPEDANCE ()
-30 -40 -50 -60 -70 -80 -90 3RD HARMONIC 2ND HARMONIC
1
0.1
0.01 1G 100k 1M 10M FREQUENCY (Hz) 100M 1G
-100 100k 1M 10M 100M FREQUENCY (Hz)
DISTORTION vs. FREQUENCY
MAX4350-07
DISTORTION vs. FREQUENCY
MAX4350-08
DISTORTION vs. LOAD RESISTANCE
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 2ND HARMONIC fO = 5MHz VOUT = 2Vp-p AVCL = +1V/V
MAX4350-09
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 100k 1M 10M 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p AVCL = +2V/V
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p AVCL = +5V/V
0
100M
100k
1M
10M
100M
0
200
400
600 RLOAD ()
800
1000
1200
FREQUENCY (Hz)
FREQUENCY (Hz)
4
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, VCM = 0, AVCL = +1V/V, RF = 24, RL = 100 to 0, TA = +25C, unless otherwise noted.)
MAX4350/MAX4351
DISTORTION vs. VOLTAGE SWING
MAX4350-10
DIFFERENTIAL GAIN AND PHASE
MAX4350-11
COMMON-MODE REJECTION vs. FREQUENCY
-10 -20 -30
MAX4350-12
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 0.5 1.0 1.5 2ND HARMONIC 3RD HARMONIC fO = 5MHz AVCL = +1V/V
DIFF GAIN (%)
0 0.12 0.10 0.08 0.06 0.04 0.02 0 -0.02 -0.04 0 DIFF PHASE (degrees)
IRE
100
CMR (dB)
0.025 0.020 0.015 0.010 0.005 0 -0.005 -0.010
0
-40 -50 -60 -70 -80 -90 -100
2.0
VOLTAGE SWING (Vp-p)
IRE
100
100k
1M
10M FREQUENCY (Hz)
100M
1G
POWER-SUPPLY REJECTION vs. FREQUENCY
MAX4350-13
OUTPUT VOLTAGE SWING vs. LOAD RESISTANCE
MAX4350-14
SMALL-SIGNAL PULSE RESPONSE
RF = 24 AVCL = +1V/V INPUT 50mV/div
MAX4350-15
0 -10 -20 -30 PSR (dB) -40 -50 -60 -70 -80 -90 -100 100k 1M 10M FREQUENCY (Hz) 100M
1.6 1.4 1.2 VSWING (V) 1.0 0.8 0.6 0.4 0.2 0 VOL - VEE 0 VCC - VOH
OUTPUT 50mV/div
1G
100 200 300 400 500 600 700 800 900 RLOAD ()
20ns/div
SMALL-SIGNAL PULSE RESPONSE
MAX4350-16
SMALL-SIGNAL PULSE RESPONSE
MAX4350-17
LARGE-SIGNAL PULSE RESPONSE
RF = 24 AVCL = +1V/V INPUT 1V/div
MAX4350-18
INPUT 25mV/div
RF = 500 AVCL = +2V/V
RF = 500 AVCL = +5V/V INPUT 10mV/div
OUTPUT 50mV/div
OUTPUT 50mV/div
OUTPUT 1V/div
20ns/div
20ns/div
20ns/div
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Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs MAX4350/MAX4351
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, VCM = 0, AVCL = +1V/V, RF = 24, RL = 100 to 0, TA = +25C, unless otherwise noted.)
LARGE-SIGNAL PULSE RESPONSE
MAX4350-19
LARGE-SIGNAL PULSE RESPONSE
RF = 500 AVCL = +2V/V INPUT 1V/div
MAX4350-20
VOLTAGE NOISE vs. FREQUENCY
RL = 100 VOLTAGE NOISE (nV/Hz)
MAX4350-21 MAX4350-24
100
RF = 500 AVCL = +2V/V INPUT 500mV/div
10
OUTPUT 1V/div
INPUT 1V/div
1 20ns/div 20ns/div 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
CURRENT NOISE vs. FREQUENCY
MAX4350-22
ISOLATION RESISTANCE vs. CAPACITIVE LOAD
MAX4350-23
SMALL-SIGNAL BANDWIDTH vs. LOAD RESISTANCE
300 250 BANDWIDTH (MHz) 200 150 100 50
100 RL = 100 CURRENT NOISE (pA/Hz)
16 15 14 RISO () 13 12 11 10 LARGE SIGNAL (VOUT = 2Vp-p) SMALL SIGNAL (VOUT = 100mVp-p)
10
1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
9 0 50 100 150 200 250 300 350 400 450 500 CLOAD (pF)
0 0 100 200 300 400 500 600 700 800 RLOAD ()
OPEN-LOOP GAIN vs. LOAD RESISTANCE
MAX4350-25
MAX4351 CROSSTALK vs. FREQUENCY
40 20 CROSSTALK (dB) 0 -20 -40 -60 -80
MAX4350-26
80 70 OPEN-LOOP GAIN (dBc) 60 50 40 30 20 10 0 100 1k RLOAD ()
60
-100 -120 -140 10k 0.1M 1M 10M FREQUENCY (Hz) 100M 1G
6
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Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs
Pin Description
PIN MAX4350 1 2 3 4 5 -- -- -- -- -- -- MAX4351 -- 4 -- -- 8 1 2 3 7 6 5 NAME OUT VEE IN+ INVCC OUTA INAINA+ OUTB INBINB+ FUNCTION Amplifier Output Negative Power Supply or Ground (in singlesupply 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
RG RF
Inverting and Noninverting Configurations Select the gain-setting feedback (RF) and input (RG) resistor values to fit your application (Figures 1a and 1b). 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.
MAX4350/MAX4351
Layout and Power-Supply Bypassing
These amplifiers operate from dual 5V supplies. Bypass each supply with a 0.1F capacitor to ground. 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 care-
Detailed Description
The MAX4350/MAX4351 are single-supply, rail-to-rail, voltage-feedback amplifiers that employ current-feedback techniques to achieve 485V/s slew rates and 210MHz 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 swings to within 125mV of each supply rail. Local feedback around the output stage ensures low open-loop output impedance to reduce gain sensitivity to load variations. The input stage permits common-mode voltages beyond the negative supply and to within 2.25V of the positive supply rail.
RTO
MAX435 _
OUT
IN RTIN
RO
Figure 1a. Noninverting Gain Configuration
RG IN RTIN
RF
Applications Information
Choosing Resistor Values
Unity-Gain Configuration The MAX4350/MAX4351 are internally compensated for unity gain. When configured for unity gain, a 24 resistor (RF) in series with the feedback path optimizes AC performance. This resistor improves AC response by reducing the Q of the parallel LC circuit formed by the parasitic feedback capacitance and inductance.
RTO
MAX435 _
OUT
RO RS
Figure 1b. Inverting Gain Configuration 7
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Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs MAX4350/MAX4351
ful attention to inputs and outputs to avoid large parasitic capacitance. Whether or not you use a constantimpedance board, observe the following design guidelines: * Don't use wire-wrap boards; they are too inductive. * Don't use IC sockets; 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.
Output Capacitive Load and Stability
The MAX4350/MAX4351 are optimized for AC performance. They are not designed to drive highly reactive loads, which decrease phase margin and may produce excessive ringing and oscillation. Figure 2 shows a circuit that eliminates this problem. Figure 3 is a graph of the Isolation Resistance (RISO) vs. Capacitive Load. Figure 4 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 5 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.
Rail-to-Rail Outputs, Ground-Sensing Input
The input common-mode range extends from V EE to (V CC - 2.25V) 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 125mV of either power-supply rail with a 2k load.
30 RG RF ISOLATION RESISTANCE () 25 20 15 10 5 0 0 50 100 150 200 CAPACITIVE LOAD (pF) 250
RISO
MAX435 _
VOUT CL
VIN RTIN 50
Figure 2. Driving a Capacitive Load Through an Isolation Resistor
Figure 3. Isolation Resistance vs. Capacitive Load
8
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Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs MAX4350/MAX4351
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 = 120pF CL = 68pF RISO = 27 CL = 47pF
Figure 4. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor
Figure 5. Small-Signal Gain vs. Frequency with Load Capacitance and 27 Isolation Resistor
Pin Configurations (continued)
TOP VIEW
Chip Information
MAX4350 TRANSISTOR COUNT: 86 MAX4351 TRANSISTOR COUNT: 170
OUTA INAINA+
1 2
8 7
VCC OUTB INBINB+
MAX4351
3 6 5 VEE 4
SOT23-8/SO
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9
Ultra-Small, Low-Cost, 210MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs MAX4350/MAX4351
Package Information
SC70, 5L.EPS
10
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SOT5L.EPS
Ultra-Small, Low-Cost, 200MHz, Dual-Supply Op Amps with Rail-to-Rail Outputs
Package Information (continued)
SOT23, 8L.EPS
MAX4350/MAX4351
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 ____________________ 11 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOICN.EPS

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