19-1831; Rev 0; 11/00 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs 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. Features ♦ Ultra-Low 1.7mA Supply Current ♦ Low Cost ♦ Single +3V/+5V Operation ♦ High Speed 500MHz -3dB Bandwidth 50MHz 0.1dB Gain Flatness 220V/µs Slew Rate ♦ Rail-to-Rail Outputs ♦ Input Common-Mode Range Extends Beyond VEE ♦ Low Differential Gain/Phase: 0.01%/0.03° ♦ Low Distortion at 5MHz -93dBc SFDR 0.003% Total Harmonic Distortion ♦ Ultra-Small SC70-5, SOT23-5, and SOT23-8 Packages 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. Ordering Information ________________________Applications Battery-Powered Instruments PART Portable Communications TOP MARK PINPACKAGE TEMP. RANGE Keyless Entry Systems MAX4412EXK-T -40°C to +85°C 5 SC70-5 ABH Cellular Telephones MAX4412EUK-T -40°C to +85°C 5 SOT23-5 ADOL MAX4413EKA-T -40°C to +85°C 8 SOT23-8 AADR Video Line Drivers Baseband Applications Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Pin Configurations Typical Operating Characteristic SUPPLY CURRENT vs. SUPPLY VOLTAGE (PER AMPLIFER) MAX4412 toc01 2.0 SUPPLY CURRENT (mA) 1.9 1.8 TOP VIEW OUT 1 VEE 2 IN+ 3 5 VCC OUTA 1 INA- 2 8 VCC 7 OUTB 3 6 INB- VEE 4 5 INB+ 1.7 1.6 1.5 MAX4413 MAX4412 4 1.4 IN- INA+ SC70/SOT23 1.3 SOT23 1.2 2.7 3.1 3.5 3.9 4.7 4.3 SUPPLY VOLTAGE (V) 5.1 5.5 ________________________________________________________________ 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. MAX4412/MAX4413 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® 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/µs 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. MAX4412/MAX4413 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs 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 = +70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............247mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW 8-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°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. 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 = +25°C.) (Note 1) PARAMETER SYMBOL Operating Supply Voltage Range VS Quiescent Supply Current (per amplifier) IS CONDITIONS Guaranteed by PSRR test MIN TYP 2.7 VCC = +5V 1.7 VCC = +3V 1.5 VEE 0.1 Input Common Mode Voltage Range VCM Input Offset Voltage VOS 0.4 TCVOS 3 Input Offset Voltage Temperature Coefficient Input Offset Voltage Matching Input Bias Current Input Offset Current Input Resistance Common Mode Rejection Ratio Guaranteed by CMRR test V 3.5 mA VCC 1.5 V 9 mV µV/°C ±1 MAX4413 mV 1.6 4 µA IOS 0.1 0.7 µA RIN CMRR Differential mode, -0.04V ≤ (VIN+ - VIN-) ≤ +0.04V 60 kΩ Common mode, VEE - 0.1V < VCM < VCC - 1.5V 16 MΩ 60 94 dB +0.2V ≤ VOUT ≤ +4.8V, RL = 10kΩ 78 93 +0.4V ≤ VOUT ≤ +4.6V, RL = 1kΩ 68 80 VEE - 0.1V < VCM < VCC - 1.5V AVOL VCC = +3V 2 UNITS 5.5 IB VCC = +5V Open-Loop Gain MAX +1V ≤ VOUT ≤ +4V, RL = 150Ω 65 +0.2V ≤ VOUT ≤ +2.8V, RL = 10kΩ 90 +0.25V ≤ VOUT ≤ +2.75V RL = 1kΩ 78 +0.5V ≤ VOUT ≤ +2.5V, RL = 150Ω 62 dB _______________________________________________________________________________________ Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs (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 = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS RL = 10kΩ VCC = +5V Output Voltage Swing RL = 1kΩ RL = 150Ω VOUT RL = 10kΩ VCC = +3V RL = 1kΩ RL = 150Ω Output Current IOUT Output Short-Circuit Current Power Supply Rejection Ratio ISC PSRR MIN TYP MAX VCC - VOH 0.085 VOL - VEE 0.015 VCC - VOH 0.105 0.275 VOL - VEE 0.035 0.125 VCC - VOH 0.385 VOL - VEE 0.150 VCC - VOH 0.06 VOL - VEE 0.01 VCC - VOH 0.075 VOL - VEE 0.025 VCC - VOH 0.275 VOL - VEE RL = 20Ω connected to VCC or VEE, VCC = +5V V 0.070 ±25 Sinking or sourcing VCC = +2.7V to +5.5V, VCM = 0, VOUT = 2V UNITS 60 ±75 mA ±85 mA 77 dB AC ELECTRICAL CHARACTERISTICS (VCC = +5V, VEE = 0, VCM = +1.75V, RL = 1kΩ connected to VCC /2, CL = 5pF, AVCL = +1V/ V , TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Small Signal -3dB Bandwidth BWSS VOUT = 100mVp-p 500 MHz Large Signal -3dB Bandwidth BWLS VOUT = 2Vp-p 30 MHz Bandwidth for 0.1dB Flatness BW0.1dB VOUT = 100mVp-p 50 VOUT = 2Vp-p 16 Slew Rate SR MHz VOUT = 2V step 220 V/µs Rise/Fall Time tR, tF VOUT = 2V step, 10% to 90% 14 ns Settling Time to 0.1% tS 1% VOUT = 2V step 100 ns Spurious-Free Dynamic Range SFDR VCC = +5V, fC = 5MHz, VOUT = 1Vp-p -84 VCC = +3V, fC = 5MHz, VOUT = 1Vp-p -93 dBc _______________________________________________________________________________________ 3 MAX4412/MAX4413 DC ELECTRICAL CHARACTERISTICS (continued) MAX4412/MAX4413 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V, VEE = 0, VCM = +1.75V, RL = 1kΩ connected to VCC /2, CL = 5pF, AVCL = +1V/ V , TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL 2nd Harmonic Distortion 3rd Harmonic Distortion CONDITIONS VCC = +3V, fC = 5MHz, VOUT = 1Vp-p -93 VCC = +5V, fC = 5MHz, VOUT = 1Vp-p -95 VCC = +3V, fC = 5MHz, VOUT = 1Vp-p -95 VCC = +5V, fC = 5MHz, VOUT = 1Vp-p 0.007 VCC = +3V, fC = 5MHz, VOUT = 1Vp-p 0.003 THD Two-Tone, Third-Order Intermodulation Distortion IP3 f1 = 10MHz, f2 = 9.9MHz Differential Gain Error DG RL = 150Ω, NTSC Differential Phase Error DP RL = 150Ω, NTSC Input Noise-Current Density dBc dBc % -67 AV = +1V/V 0.03 AV = +2V/V 0.01 AV = +1V/V 0.13 AV = +2V/V 0.03 MAX4413, VOUT = 100mVp-p, f ≤ 10MHz 0.1 dBc % degrees dB MAX4413, VOUT = 100mVp-p f ≤ 10MHz 0.1 degrees 13 nV/√Hz In f = 10kHz 0.7 pA/√ Hz CIN Output Impedance ZOUT Capacitive Load Drive 1.8 f = 1MHz 0.7 Ω 120 pF 1.2 XTALK pF No sustained oscillations Power-Up 1% Settling Time (Note 2) MAX4413, f = 10MHz, VOUT = 2Vp-p 100 -82 Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design. 4 UNITS f = 10kHz Input Capacitance Crosstalk MAX en Phase Matching Input Noise-Voltage Density TYP -84 Total Harmonic Distortion Gain Matching MIN VCC = +5V, fC = 5MHz, VOUT = 1Vp-p _______________________________________________________________________________________ µs dB Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs 1.7 1.6 1.5 1.4 22pF 0 -1 -2 -3 -4 3.1 3.5 3.9 4.7 4.3 SUPPLY VOLTAGE (V) 5.1 SMALL-SIGNAL GAIN with CAPACITIVE LOAD and 22Ω ISOLATION RESISTOR vs. FREQUENCY 0 -1 5pF -2 -2 1G 100k LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY 0.3 0.4 0.2 0.1 0 -0.1 -0.2 0.3 0.2 0.1 -0.1 -0.4 -5 100k -0.5 100k -0.5 1M 10M 100M 100k 1G 180 AVCL = +1000V/V 80 135 60 0 GAIN (dB) VOUT = 2VP-P -2 -3 90 GAIN 40 45 PHASE 20 0 0 -45 -20 -90 -4 -5 -135 -40 -6 -7 -180 -60 100k 1M 10M FREQUENCY (Hz) 100M 1G 10k 100K 1M 10M FREQUENCY (Hz) 100M 1G DIFFERENTIAL GAIN (%) MAX4412 toc09 PHASE (deg) VOUT = 1VP-P MAX4412 toc07 2 GAIN AND PHASE vs. FREQUENCY 100 DIFFERENTIAL PHASE (deg) LARGE-SIGNAL GAIN vs. FREQUENCY 3 1M 10M 100M 1G FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) -1 VOUT = 2VP-P -0.2 -4 1 VOUT = 1VP-P 0 -0.3 1G 1G 0.5 -0.4 100M 100M SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY -0.3 10M 10M FREQUENCY (Hz) -3 1M 1M FREQUENCY (Hz) LARGE-SIGNAL GAIN (dB) 15pF 1 100M 0.4 GAIN FLATNESS (dB) 22pF 2 10M MAX4412 toc05 3 0 -6 1M 0.5 MAX4412 toc04 5 4 15pF 2 5pF -7 100k 5.5 4 DIFFERENTIAL GAIN AND PHASE MAX4412 toc10 2.7 6 -4 -6 1.2 SMALL-SIGNAL GAIN (dB) 8 -5 1.3 MAX4412 toc03 1 SMALL-SIGNAL GAIN (dB) 1.8 10 MAX4412 toc02 2 SMALL-SIGNAL GAIN (dB) 1.9 SUPPLY CURRENT (mA) 3 MAX4412 toc01 2.0 LARGE-SIGNAL GAIN (dB) SMALL-SIGNAL GAIN with CAPACATIVE LOAD vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY MAX4412 toc06 SUPPLY CURRENT vs. SUPPLY VOLTAGE (PER AMPLIFER) 0.04 0.03 0.02 0.01 0 0 10 20 30 40 50 60 70 80 90 100 IRE 0 10 20 30 40 50 60 70 80 90 100 0.15 0.10 0.05 0 IRE _______________________________________________________________________________________ 5 MAX4412/MAX4413 Typical Operating Characteristics (VCC = +5V, VEE = 0, VCM = +1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.) INPUT 500mV/div INPUT 1V/div OUTPUT 1V/div OUTPUT 500mV/div OUTPUT 50mV/div MAX4412 toc13 MAX4412 toc12 MAX4412 toc11 INPUT 50mV/div LARGE-SIGNAL PULSE RESPONSE LARGE-SIGNAL PULSE RESPONSE SMALL-SIGNAL PULSE RESPONSE RL = 1kΩ RL = 1kΩ RL = 1kΩ SMALL-SIGNAL PULSE RESPONSE LARGE-SIGNAL PULSE RESPONSE SMALL-SIGNAL PULSE RESPONSE (CL = 15pF) INPUT 500mV/div RL = 150Ω INPUT 50mV/div OUTPUT 50mV/div OUTPUT 500mV/div OUTPUT 50mV/div MAX4412 toc16 50ns/div MAX4412 toc15 50ns/div MAX4412 toc14 50ns/div INPUT 50mV/div RL = 150Ω 50ns/div 50ns/div MAX4413 CROSSTALK vs. FREQUENCY SMALL SIGNAL BANDWIDTH vs. LOAD RESISTANCE MAX4412/MAX4413 CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY -10 CROSSTALK (dB) 10 -30 -40 -50 -60 -70 1 500 BANDWIDTH (MHz) -20 100 600 MAX4412 toc18 0 MAX4412 toc17 1000 -80 MAX4412 toc19 50ns/div OUTPUT IMPEDANCE (Ω) MAX4412/MAX4413 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs 400 300 200 100 -90 100k 1M 10M FREQUENCY (Hz) 6 0 -100 0.1 100M 1G 100k 1M 10M FREQUENCY (Hz) 100M 1G 100 1000 RLOAD (Ω) _______________________________________________________________________________________ Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs 60 40 200 10k 100k -50 -70 VOH -80 100 VOL -90 -100 0 1k -40 -60 150 50 100 100 1k 100k 10k 1M 10M 100M RLOAD (Ω) RLOAD (Ω) FREQUENCY (Hz) COMMON-MODE REJECTION vs. FREQUENCY VOLTAGE NOISE DENSITY vs. FREQUENCY CURRENT NOISE DENSITY vs. FREQUENCY -70 -80 -90 100 10 1 10 -100 1M 10M 100M 0 1 1G MAX4412 toc25 CURRENT NOISE DENSITY pA/√Hz -60 10 100 1k 10k 100k 1M 1 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) HARMONIC DISTORTION vs. FREQUENCY HARMONIC DISTORTION vs. OUTPUT VOLTAGE HARMONIC DISTORTION vs. LOAD RESISTENCE -60 MAX4412 toc26 VOUT = 1Vp-p -20 1G 100 MAX4412 toc24 -50 1000 VOLTAGE NOISE DENSITY nV/√Hz MAX4412 toc23 -40 100k MAX4412 toc22 -30 250 0 CMR (dB) -20 300 20 0 MAX4412 toc21 350 f = 5MHz 0 -65 1M MAX4412 toc28 80 400 PSR (dB) 100 0 -10 MAX4412 toc27 OPEN-LOOP GAIN (dB) 120 450 OUTPUT VOLTAGE SWING (mV) MAX4412 toc20 140 POWER SUPPLY REJECTION vs. FREQUENCY OUTPUT VOLTAGE SWING vs. LOAD RESISTANCE OPEN-LOOP GAIN vs. LOAD RESISTANCE VOUT = 1Vp-p, f = 5MHz -20 -40 -60 2nd HARMONIC -80 DISTORTION (dBc) DISTORTION (dBc) DISTORTION (dBc) -70 -75 2nd HARMONIC -80 -85 -40 -60 2nd HARMONIC -80 -90 -100 -100 3rd HARMONIC -95 3rd HARMONIC 3rd HARMONIC -100 -120 100K 1M 10M FREQUENCY (Hz) 100M -120 0 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (Vp-p) 3.0 3.5 100 1K 10K RLOAD (Ω) ________________________________________________________________________________________ 7 MAX4412/MAX4413 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT (PER AMPLIFIER) vs. TEMPERATURE POWER-UP RESPONSE TIME 26 3.0 +5V 2.5 VSUPPLY 2.0V/div 24 0 22 20 18 +1.5V 16 VOUT 750mV/div 14 SUPPLY CURRENT (mA) 28 MAX4412 toc30 MAX4412 toc29 30 MAX4412 toc31 ISOLATION RESISTANCE vs. CAPACITIVE LOAD RISO (Ω) 2.0 1.5 1.0 0.5 0 12 0 10 -50 0 200 400 600 800 1000 -25 500ns/div 0 25 50 75 TEMPERATURE (°C) CLOAD (pF) INPUT OFFSET CURRENT vs. TEMPERATURE INPUT BIAS CURRENT vs. TEMPERATURE INPUT BIAS CURRENT (µA) 2.0 1.5 1.0 MAX4412 toc33 2.5 100 90 INPUT OFFSET CURRENT (nA) MAX4412 toc32 3.0 0.5 80 70 60 50 40 30 20 10 0 0 -25 0 25 50 75 -25 0 25 50 75 TEMPERATURE (°C) TEMPERATURE (°C) INPUT OFFSET VOLTAGE vs. TEMPERATURE OUTPUT VOLTAGE SWING vs. TEMPERATURE 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 250 100 MAX4412 toc35 MAX4412 toc34 1.0 225 200 175 150 VOH = VCC - VOUT 125 100 75 VOL = VOUT - VEE 50 25 0.1 0 0 -50 -25 0 25 50 TEMPERATURE (°C) 8 -50 100 OUTPUT VOLTAGE SWING (mV) -50 INPUT OFFSET VOLTAGE (mV) MAX4412/MAX4413 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs 75 100 -50 -25 0 25 50 TEMPERATURE (°C) _______________________________________________________________________________________ 75 100 100 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs PIN NAME FUNCTION MAX4412 MAX4413 1 OUT 1 OUTA 7 OUTB 2 4 VEE Negative Power Supply Amplifier Noninverting Input Amplifier Output Amplifier A Output Amplifier B Output 3 IN+ 3 INA+ Amplifier A Noninverting Input 5 INB+ Amplifier B Noninverting Input 4 IN- 2 INA- Amplifier A Inverting Input 6 INB- Amplifier B Inverting Input 5 8 VCC Positive Power Supply Amplifier Inverting Input Detailed Description The MAX4412/MAX4413 single-supply, rail-to-rail, voltage-feedback amplifiers achieve 220V/µs 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 1kΩ 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. 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 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 20Ω to 30Ω) 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 22Ω Isolation Resistor graph shows the effect of a 22Ω 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 24Ω 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 MAX4412/MAX4413 Pin Description 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 1kΩ 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 1kΩ resistors to 100Ω extends the pole frequency to 1.14GHz, but could limit output swing by adding 200Ω 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 RS = RF × 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 RF RISO VIN RF RG VOUT CL VOUT RBIN RS R0 IN VOUT = [1+ (RF / RG)] VIN Figure 1. Driving a Capacitive Load Through an Isolation Resistor ISOLATION RESISTANCE vs. CAPACITIVE LOAD Figure 3a. Noninverting Gain Configuration MAX4412 toc29 30 28 26 RG 24 RISO (Ω) MAX4412/MAX4413 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs RF IN 22 20 VOUT 18 16 RO 14 VOUT = (RF / RG) VIN RS 12 10 0 200 400 600 800 1000 CLOAD (pF) Figure 2. Isolation Resistance vs. Capacitive Load 10 Figure 3b. Inverting Gain Configuration ______________________________________________________________________________________ Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs f0 1 R2 × R3 × C1 × C2 C2 Q = C1 × C2 × R2 × R3 1 1 1 + + R1 R2 R3 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. These amplifiers operate from a single +2.7V to +5.5V power supply. Bypass V CC to ground with a 0.1µF 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. ______________________________________________________________________________________ 11 MAX4412/MAX4413 Layout and Power-Supply Bypassing 1 = × 2π MAX4412/MAX4413 Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs +5.0V C2 15pF R2 150Ω R3 511Ω R1 150Ω 10k VIN VOUT C1 100pF MAX4412 10k Figure 4. Multiple-Feedback Lowpass Filter _ Chip Information MAX4412 TRANSISTOR COUNT: 99 MAX4413 TRANSISTOR COUNT: 192 PROCESS: Bipolar 12 ______________________________________________________________________________________ Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs SC70, 5L.EPS ______________________________________________________________________________________ 13 MAX4412/MAX4413 Package Information Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs SOT5L.EPS MAX4412/MAX4413 Package Information (continued) 14 ______________________________________________________________________________________ Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs SOT23, 8L.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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________15 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX4412/MAX4413 Package Information (continued)