19-1338; Rev 2; 4/99 Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers ____________________________Features ♦ 2.2mA Supply Current ________________________Applications High-Speed DAC Buffers Wireless LANs ♦ High Speed 780MHz -3dB Bandwidth (MAX4201/MAX4202) 280MHz 0.1dB Gain Flatness (MAX4201/MAX4202) 4200V/µs Slew Rate ♦ Low 2.1nV/√Hz Voltage-Noise Density ♦ Low 0.8pA/√Hz Current-Noise Density ♦ High ±90mA Output Drive (MAX4200/MAX4203) ♦ Excellent Capacitive-Load-Driving Capability ♦ Available in Space-Saving SOT23 or µMAX Packages _______________Ordering Information TEMP. RANGE PINPACKAGE MAX4200ESA -40°C to +85°C 8 SO MAX4200EUK-T -40°C to +85°C 5 SOT23-5 MAX4201ESA -40°C to +85°C 8 SO MAX4201EUK-T -40°C to +85°C 5 SOT23-5 PART TOP MARK — AABZ — ABAA — MAX4202ESA -40°C to +85°C 8 SO Digital-Transmission Line Drivers MAX4202EUK-T -40°C to +85°C 5 SOT23-5 High-Speed ADC Input Buffers MAX4203ESA -40°C to +85°C 8 SO — MAX4203EUA -40°C to +85°C 8 µMAX — MAX4204ESA -40°C to +85°C 8 SO — MAX4204EUA -40°C to +85°C 8 µMAX — MAX4205ESA -40°C to +85°C 8 SO — MAX4205EUA -40°C to +85°C 8 µMAX — IF/Communications Systems ___________________________Selector Guide PART INTERNAL NO. OF OUTPUT BUFFERS TERMINATION (Ω) ABAB PIN-PACKAGE ___________Typical Application Circuit MAX4200 1 — 8 SO, 5 SOT23 MAX4201 1 50 8 SO, 5 SOT23 MAX4202 1 75 8 SO, 5 SOT23 MAX4203 2 — 8 SO/µMAX MAX4204 2 50 8 SO/µMAX MAX4205 2 75 8 SO/µMAX Pin Configurations appear at end of data sheet. RT* 50Ω 50Ω CABLE IN OUT MAX4201 *RL = RT + REXT REXT* 50Ω COAXIAL CABLE DRIVER ________________________________________________________________ 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 1-800-835-8769. MAX4200–MAX4205 ________________General Description The MAX4200–MAX4205 are ultra-high-speed, openloop buffers featuring high slew rate, high output current, low noise, and excellent capacitive-load-driving capability. The MAX4200/MAX4201/MAX4202 are single buffers, while the MAX4203/MAX4204/MAX4205 are dual buffers. The MAX4201/MAX4204 have integrated 50Ω termination resistors, making them ideal for driving 50Ω transmission lines. The MAX4202/MAX4205 include 75Ω back-termination resistors for driving 75Ω transmission lines. The MAX4200/MAX4203 have no internal termination resistors. The MAX4200–MAX4205 use a proprietary architecture to achieve up to 780MHz -3dB bandwidth, 280MHz 0.1dB gain flatness, 4200V/µs slew rate, and ±90mA output current drive capability. They operate from ±5V supplies and draw only 2.2mA of quiescent current. These features, along with low-noise performance, make these buffers suitable for driving high-speed analog-todigital converter (ADC) inputs or for data-communications applications. MAX4200–MAX4205 Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE)................................................+12V Voltage on Any Pin to GND..............(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration to GND........................Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............330mW 8-Pin SO (derate 5.9mW/°C above +70°C)...................471mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+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 = +5V, VEE = -5V, RL = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS Operating Supply Voltage VS Guaranteed by PSR test Quiescent Supply Current IS Per buffer, VIN = 0V Input Offset Voltage Input Offset Voltage Drift Input Resistance Voltage Gain Power-Supply Rejection Output Resistance Output Current Short-Circuit Output Current 2 MAX UNITS ±5.5 V 2.2 4 mA 15 VOS VIN = 0V 1 VIN = 0V 20 µV/°C MAX4203/MAX4204/MAX4205 0.4 mV IB 0.8 RIN 500 AV PSR ROUT IOUT ISC -3.0V ≤ VOUT ≤ 3.0V 10 0.9 0.96 1.1 MAX4201/MAX4204, REXT = 50Ω 0.42 0.50 0.58 MAX4202/MAX4205, REXT = 75Ω 0.41 0.50 0.59 55 72 VS = ±4V to ±5.5V f = DC RL = 30Ω Sinking or sourcing VOUT MAX4200/MAX4203 8 MAX4201/MAX4204 50 MAX4202/MAX4205 75 MAX4200/MAX4203 ±90 MAX4201/MAX4204 ±52 MAX4202/MAX4205 ±44 MAX4200/MAX4203 150 MAX4201/MAX4204 90 MAX4202/MAX4205 75 RL = 150Ω ±3.3 ±3.8 RL = 100Ω ±3.2 ±3.7 RL = 37.5Ω ±3.3 MAX4201/MAX4204 RL = 50Ω ±1.9 ±2.1 MAX4202/MAX4205 RL = 75Ω ±2.0 ±2.3 _______________________________________________________________________________________ mV µA kΩ MAX4200/MAX4203, REXT = 150Ω MAX4200/MAX4203 Output Voltage Swing TYP ±4 TCVOS Input Offset Voltage Matching Input Bias Current MIN V/V dB Ω mA mA V Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers (VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER -3dB Bandwidth SYMBOL BW(-3dB) 0.1dB Bandwidth BW(0.1dB) Full-Power Bandwidth Slew Rate FPBW SR CONDITIONS VOUT ≤ 100mVRMS VOUT ≤ 100mVRMS VOUT ≤ 2Vp-p MIN 660 MAX4201/MAX4202 780 MAX4203 530 MAX4204/MAX4205 720 MAX4200 220 MAX4201/MAX4202 280 MAX4203 130 MAX4204/MAX4205 230 MAX4200/MAX4201/MAX4202 490 MAX4203/MAX4204/MAX4205 310 VOUT = 2V step Group Delay Time Settling Time to 0.1% tS VOUT = 2V step MAX4200/MAX4201/ MAX4202 Spurious-Free Dynamic Range SFDR VOUT = 2Vp-p MAX4203/MAX4204/ MAX4205 Harmonic Distortion TYP MAX4200 UNITS MHz MHz MHz 4200 V/µs 405 ps 12 ns f = 5MHz -48 f = 20MHz -45 f = 100MHz -34 f = 5MHz -47 f = 20MHz -44 f = 100MHz -32 MAX4200/MAX4201/ MAX4202, f = 500kHz, VOUT = 2Vp-p Second harmonic -72 Third harmonic -48 Total harmonic -48 MAX4203/MAX4204/| MAX4205, f = 500kHz, VOUT = 2Vp-p Second harmonic -83 Third harmonic -47 Total harmonic -47 HD MAX dBc dBc Differential Gain Error DG NTSC, RL = 150Ω 1.3 % Differential Phase Error DP NTSC, RL = 150Ω 0.15 degrees Input Voltage Noise Density en f = 1MHz 2.1 nV/√Hz Input Current Noise Density in f = 1MHz 0.8 pA/√Hz 2 pF 6 Ω Input Capacitance CIN Output Impedance ZOUT f = 10MHz XTALK VOUT = 2Vp-p VOUT = 2Vp-p Amplifier Crosstalk f = 10MHz -87 f = 100MHz -65 dB _______________________________________________________________________________________ 3 MAX4200–MAX4205 AC ELECTRICAL CHARACTERISTICS __________________________________________Typical Operating Characteristics (VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise noted.) 0 -1 -2 -3 2 0 -1 -2 -3 1 0 -1 -2 -3 -4 -4 -4 -5 -5 -6 100k 1M 10M 100M 1G -6 100k 1M 10M 100M 1G 100k 1M 10M 100M 1G FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) MAX4203 SMALL-SIGNAL GAIN vs. FREQUENCY MAX4204/MAX4205 SMALL-SIGNAL GAIN vs. FREQUENCY MAX4203/MAX4204/MAX4205 LARGE-SIGNAL GAIN vs. FREQUENCY 0 -1 -2 -3 1 0 -1 -2 -3 2 0 -1 -2 -3 -4 -4 -5 -5 -5 -6 1M 100M 10M -6 100k 1G 1M 10M 100M 1G FREQUENCY (Hz) FREQUENCY (Hz) GROUP DELAY vs. FREQUENCY POWER-SUPPLY REJECTION vs. FREQUENCY 3 -10 -20 -30 1 -40 PSR (dB) 2 0 7000 -50 5000 4000 -70 -3 -80 2000 -4 -90 1000 -5 -100 100M FREQUENCY (Hz) 1G 10G 1G 6000 -2 10M 100M 8000 -60 1M 10M SLEW RATE vs. OUTPUT VOLTAGE -1 100k 1M 9000 SLEW RATE (V/µs) 4 100k FREQUENCY (Hz) 0 MAX4200/25-07 5 10G MAX4200/25-08 100k VOUT = 2Vp-p 1 -4 -6 MAX4200/25-06 4 3 MAX4200/4205-09 1 VOUT = 100mVp-p 2 NORMALIZED GAIN (dB) 2 3 NORMALIZED GAIN (dB) VOUT = 100mVp-p MAX4200/25-05 4 MAX4200/25-04 4 3 NORMALIZED GAIN (dB) 1 VOUT = 2Vp-p 3 -5 -6 4 4 NORMALIZED GAIN (dB) 2 NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) 2 1 VOUT = 100mVp-p 3 MAX4200/MAX4201/MAX4202 LARGE-SIGNAL GAIN vs. FREQUENCY MAX4200/25-02 VOUT = 100mVp-p 3 4 MAX4200/25-01 4 MAX4201/MAX4202 SMALL-SIGNAL GAIN vs. FREQUENCY MAX4200/25-03 MAX4200 SMALL-SIGNAL GAIN vs. FREQUENCY GROUP DELAY (ns) MAX4200–MAX4205 Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers 3000 0 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (Vp-p) _______________________________________________________________________________________ Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers -30 -40 THIRD HARMONIC -50 -60 -70 SECOND HARMONIC -80 -30 -40 -60 -70 -90 -100 10M 10 -80 -100 1M THIRD HARMONIC -50 100 MAX4200/4205-12 -20 -90 100k VOUT = 2Vp-p MAX4200/MAX4203 OUTPUT IMPEDANCE vs. FREQUENCY OUTPUT IMPEDANCE (Ω) -20 0 -10 HARMONIC DISTORTION (dBc) VIN = 2Vp-p SECOND HARMONIC 1 100k 100M 1M 10M 100k 100M 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) MAX4201/MAX4204 OUTPUT IMPEDANCE vs. FREQUENCY MAX4202/MAX4205 OUTPUT IMPEDANCE vs. FREQUENCY MAX4203/MAX4204/MAX4205 CROSSTALK vs. FREQUENCY 0 1G MAX4200/4205-15 100 MAX4200/4205-14 -10 -20 -30 CROSSTALK (dB) OUTPUT IMPEDANCE (Ω) MAX4200/4205-13 100 OUTPUT IMPEDANCE (Ω) HARMONIC DISTORTION (dBc) MAX4200/4205-10 0 -10 MAX4200/4205-11 MAX4203/MAX4204/MAX4205 HARMONIC DISTORTION vs. FREQUENCY MAX4200/MAX4201/MAX4202 HARMONIC DISTORTION vs. FREQUENCY -40 -50 -60 -70 -80 -90 10 100k 1M 10M 100M 1M 10M 100M 100k 1G 1M 10M 100M 1G FREQUENCY (Hz) INPUT VOLTAGE NOISE DENSITY vs. FREQUENCY INPUT CURRENT NOISE DENSITY vs. FREQUENCY DIFFERENTIAL GAIN AND PHASE (RL = 150Ω) 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 1.5 10G MAX4200/4205-18 MAX4200/4205-17 1.0 0.5 0 -0.5 0 1.0 DIFF PHASE (deg) CURRENT NOISE DENSITY (pA/√Hz) 10 10 DIFF GAIN (%) FREQUENCY (Hz) MAX4200/4205-16 VOLTAGE NOISE DENSITY (nV/√Hz) 100k FREQUENCY (Hz) 100 1 -100 10 1G 100 0.20 0.15 0.10 0.05 0 -0.05 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 0 100 IRE _______________________________________________________________________________________ 5 MAX4200–MAX4205 _________________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise noted.) _________________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise noted.) OUTPUT VOLTAGE SWING vs. EXTERNAL LOAD RESISTANCE GAIN ERROR vs. INPUT VOLTAGE 10 8 6 RL = 100Ω 4 MAX4200/4203 GND OUT GND MAX4201/4204 7 6 VOLTAGE 50mV/div 5 4 MAX4202/4205 3 2 1 0 -5 -4 -3 -2 -1 0 1 2 3 4 0 5 50 100 150 200 250 300 350 400 MAX4200/MAX4203 SMALL-SIGNAL PULSE RESPONSE MAX4201/MAX4202/MAX4204/MAX4205 SMALL-SIGNAL PULSE RESPONSE MAX4200-22 IN LARGE-SIGNAL PULSE RESPONSE MAX4200-23 GND VOLTAGE 50mV/div IN MAX4200-24 GND VOLTAGE 50mV/div OUT GND CLOAD = 15pF TIME (5ns/div) EXTERNAL LOAD RESISTANCE (Ω) INPUT VOLTAGE (V) IN GND OUT GND VOLTAGE 1V/div OUT GND CLOAD = 22pF TIME (5ns/div) 6 IN 8 RL = 150Ω 2 MAX4200-20 9 OUTPUT VOLTAGE SWING (Vp-p) 12 SMALL-SIGNAL PULSE RESPONSE MAX4200-21 10 MAX4200-19 14 GAIN ERROR (%) MAX4200–MAX4205 Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers TIME (5ns/div) TIME (5ns/div) _______________________________________________________________________________________ Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers MAX4200-26 4.0 IN VOLTAGE 1V/div VOLTAGE 1V/div OUT OUT GND 3.5 GND GND SUPPLY CURRENT (mA) GND MAX4200-27 MAX4200-25 IN SUPPLY CURRENT (PER BUFFER) vs. TEMPERATURE MAX4201/MAX4202/MAX4204/MAX4205 LARGE-SIGNAL PULSE RESPONSE MAX4200/MAX4203 LARGE-SIGNAL PULSE RESPONSE 3.0 2.5 2.0 1.5 CLOAD = 22pF CLOAD = 15pF 1.0 -40 TIME (5ns/div) TIME (5ns/div) -15 10 35 60 85 TEMPERATURE (°C) INPUT OFFSET VOLTAGE vs. TEMPERATURE 1 0 -1 -2 3 2 1 0 -1 -2 -3 -3 -4 -4 -5 -15 10 35 TEMPERATURE (°C) 60 85 RL = 100Ω 3.6 3.4 3.2 -5 -40 RL = 150Ω 3.8 VOLTAGE SWING (Vp-p) 2 MAX4200-30 4 INPUT BIAS CURRENT (µA) 3 4.0 MAX4200-29 4 INPUT OFFSET VOLTAGE (mV) 5 MAX4200-28 5 MAX4200/MAX4203 OUTPUT VOLTAGE SWING vs. TEMPERATURE INPUT BIAS CURRENT vs. TEMPERATURE 3.0 -40 -15 10 35 TEMPERATURE (°C) 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 7 MAX4200–MAX4205 _________________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise noted.) MAX4200–MAX4205 Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers ______________________________________________________________Pin Description PIN MAX4200/MAX4201/MAX4202 MAX4203 MAX4204 MAX4205 FUNCTION SOT23-5 SO 1 1, 2, 5, 8 — N.C. 3 3 — IN Buffer Input — — 1 IN1 Buffer 1 Input — — 2 OUT1 2 4 — VEE Negative Power Supply — — 3 VEE1 Negative Power Supply for Buffer 1 — — 4 VEE2 Negative Power Supply for Buffer 2 — — 5 IN2 Buffer 2 Input — — 6 OUT2 Buffer 2 Output 5 6 — OUT Buffer Output 4 7 — VCC Positive Power Supply — — 7 VCC2 Positive Power Supply for Buffer 2 — — 8 VCC1 Positive Power Supply for Buffer 1 SO/µMAX _______________Detailed Description The MAX4200–MAX4205 wide-band, open-loop buffers feature high slew rates, high output current, low 2.1nV√Hz voltage-noise density, and excellent capacitive-load-driving capability. The MAX4200/MAX4203 are single/dual buffers with up to 660MHz bandwidth, 230MHz 0.1dB gain flatness, and a 4200V/µs slew rate. The MAX4201/MAX4204 single/dual buffers with integrated 50Ω output termination resistors, up to 780MHz bandwidth, 280MHz gain flatness, and a 4200V/µs slew rate, are ideally suited for driving high-speed signals over 50Ω cables. The MAX4202/MAX4205 provide bandwidths up to 720MHz, 230MHz gain flatness, 4200V/µs slew rate, and integrated 75Ω output termination resistors for driving 75Ω cables. With an open-loop gain that is slightly less than +1V/V, these devices do not have to be compensated with the internal dominant pole (and its associated phase shift) that is present in voltage-feedback devices. This feature allows the MAX4200–MAX4205 to achieve a nearly constant group delay time of 405ps over their full frequency range, making them well suited for a variety of RF and IF signal-processing applications. 8 NAME Not Internally Connected Buffer 1 Output These buffers operate with ±5V supplies and consume only 2.2mA of quiescent supply current per buffer while providing up to ±90mA of output current drive capability. __________Applications Information Power Supplies The MAX4200–MAX4205 operate with dual supplies from ±4V to ±5.5V. Both V CC and V EE should be bypassed to the ground plane with a 0.1µF capacitor located as close to the device pin as possible. Layout Techniques 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 6GHz. Pay careful attention to inputs and outputs to avoid large parasitic capacitance. Whether or not you use a constant-impedance board, observe the following guidelines when designing the board: • Do not use wire-wrap boards, because they are too inductive. • Do not use IC sockets, because they increase parasitic capacitance and inductance. _______________________________________________________________________________________ Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers 50Ω COAX RT* SOURCE RL 50Ω MAX42_ _ Input Impedance The MAX4200–MAX4205 input impedance looks like a 500kΩ resistor in parallel with a 2pF capacitor. Since these devices operate without negative feedback, there is no loop gain to transform the input impedance upward, as in closed-loop buffers. Inductive input sources (such as an unterminated cable) may react with the input capacitance and produce some peaking in the buffer’s frequency response. This effect can usually be minimized by using a properly terminated transmission line at the buffer input, as shown in Figure 1. Output Current and Gain Sensitivity The absence of negative feedback means that openloop buffers have no loop gain to reduce their effective output impedance. As a result, open-loop devices usually suffer from decreasing gain as the output current is decreased. The MAX4200–MAX4205 include local feedback around the buffer’s class-AB output stage to ensure low output impedance and reduce gain sensitivity to load variations. This feedback also produces demand-driven current bias to the output transistors for ±90mA (MAX4200/MAX4203) drive capability that is relatively independent of the output voltage (see Typical Operating Characteristics). Output Capacitive Loading and Stability The MAX4200–MAX4205 provide maximum AC performance with no load capacitance. This is the case when the load is a properly terminated transmission line. However, these devices are designed to drive any load capacitance without oscillating, but with reduced AC performance. Since the MAX4200–MAX4205 operate in an open-loop configuration, there is no negative feedback to be transformed into positive feedback through phase shift introduced by a capacitive load. Therefore, these devices will not oscillate with capacitive loading, unlike similar buffers operating in a closed-loop configuration. However, a capacitive load reacting with the buffer’s output impedance can still affect circuit performance. A capacitive load will form a lowpass filter with the buffer’s output resistance, thereby limiting system bandwidth. With higher capacitive loads, bandwidth is dominated by the RC network formed by RT and CL; *MAX4201/4202/4204/4205 ONLY Figure 1. Using a Properly Terminated Input Source the bandwidth of the buffer itself is much higher. Also note that the isolation resistor forms a divider that decreases the voltage delivered to the load. Another concern when driving capacitive loads results from the amplifier’s output impedance, which looks inductive at high frequency. This inductance forms an L-C resonant circuit with the capacitive load and causes peaking in the buffer’s frequency response. Figure 2 shows the frequency response of the MAX4200/MAX4203 under different capacitive loads. To settle out some of the peaking, the output requires an isolation resistor like the one shown in Figure 3. Figure 4 is a plot of the MAX4200/MAX4203 frequency response with capacitive loading and a 10Ω isolation resistor. In many applications, the output termination resistors included in the MAX4201/MAX4202/ MAX4204/MAX4205 will serve this purpose, reducing component count and board space. Figure 5 shows the MAX4201/MAX4202/MAX4204/MAX4205 frequency response with capacitive loads of 47pF, 68pF, and 120pF. Coaxial Cable Drivers 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. The MAX4201/MAX4204, with their integrated 50Ω output termination resistors, are ideal for driving 50Ω cables. The MAX4202/MAX4205 include integrated 75Ω termination resistors for driving 75Ω cables. Note that the output termination resistor forms a voltage divider with the load resistance, thereby decreasing the amplitude of the signal at the receiving end of the cable by one half (see the Typical Application Circuit). _______________________________________________________________________________________ 9 MAX4200–MAX4205 • 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. 5 4 VOUT = 100mVp-p MAX4200-FIG02 MAX4200–MAX4205 Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers CL = 47pF CL = 68pF 3 GAIN (dB) 2 RISO CL = 120pF 1 VIN VOUT 0 CL -1 MAX4200 MAX4203 -2 -3 CL = 220pF -4 -5 100k 10M 1M 100M 1G FREQUENCY (Hz) RISO = 10Ω VOUT = 100mVp-p 3 GAIN (dB) 2 CL = 68pF 0 -1 3 -1 -3 -3 -4 -5 10M CL = 68pF 0 -4 1M CL = 47pF 1 CL = 120pF -2 CL = 120pF 100k VOUT = 100mVp-p 2 CL = 47pF 1 -2 -5 100M 1G FREQUENCY (Hz) Figure 4. MAX4200/MAX4203 Small-Signal Gain vs. Frequency with Load Capacitance and 10Ω Isolation Resistor 10 5 4 MAX4200-FIG05 4 GAIN (dB) 5 Figure 3. Driving a Capacitive Load Through an Isolation Resistor MAX4200-FIG04 Figure 2. MAX4200/MAX4203 Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 5. MAX4201/MAX4202/MAX4204/MAX4205 SmallSignal Gain vs. Frequency with Capacitive Load and No External Isolation Resistor ______________________________________________________________________________________ Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers TOP VIEW N.C. 1 VEE 2 5 OUT N.C. 1 N.C. 2 *RT *RT IN 3 IN 3 MAX4203 MAX4204 MAX4205 MAX4200 MAX4201 MAX4202 MAX4200 MAX4201 MAX4202 4 VCC VEE 4 SO SOT23-5 N.C. = NOT INTERNALLY CONNECTED 8 N.C. IN1 1 7 VCC OUT1 2 *RT 6 OUT VEE1 3 5 N.C. VEE2 *RT 4 8 VCC1 7 VCC2 6 OUT2 5 IN2 SO/µMAX * RT = 0Ω (MAX4200/MAX4203) RT = 50Ω (MAX4201/MAX4204) RT = 75Ω (MAX4202/MAX4205) ___________________Chip Information TRANSISTOR COUNTS: MAX4200/MAX4201/MAX4202: 33 MAX4203/MAX4204/MAX4205: 67 SUBSTRATE CONNECTED TO VEE ______________________________________________________________________________________ 11 MAX4200–MAX4205 __________________________________________________________Pin Configurations SOT5L.EPS ________________________________________________________Package Information 8LUMAXD.EPS MAX4200–MAX4205 Ultra-High-Speed, Low-Noise, Low-Power, SOT23 Open-Loop Buffers 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.