19-1522; Rev 2; 1/00 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs Features ♦ Ultra-Small SC70-5, SOT23-5, and SOT23-8 Packages ♦ Low Cost ♦ High Speed 210MHz -3dB Bandwidth 55MHz 0.1dB Gain Flatness 485V/µs Slew Rate ♦ Single +4.5V to +11V Operation ♦ Rail-to-Rail Outputs ♦ Input Common-Mode Range Extends Beyond VEE ♦ Low Differential Gain/Phase: 0.02%/0.08° ♦ Low Distortion at 5MHz -65dBc SFDR -63dB Total Harmonic Distortion 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 Digital Cameras Ordering Information PART TEMP. RANGE PINPACKAGE TOP MARK MAX4450EXK-T -40°C to +85°C 5 SC70-5 AAA MAX4450EUK-T -40°C to +85°C 5 SOT23-5 ADKP MAX4451EKA-T -40°C to +85°C 8 SOT23-8 AAAA MAX4451ESA -40°C to +85°C 8 SO Pin Configurations Typical Operating Circuit TOP VIEW RF 24Ω OUT 1 RTO 50Ω MAX4450 — VOUT ZO = 50Ω RO 50Ω IN RTIN 50Ω VEE 2 IN+ 3 5 VCC 4 IN- MAX4450 SC70-5/SOT23-5 UNITY-GAIN LINE DRIVER (RL = RO + RTO) 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 and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX4450/MAX4451 General Description The MAX4450 single and MAX4451 dual op amps are unity-gain-stable devices that combine high-speed performance with Rail-to-Rail® outputs. Both devices operate from a +4.5V to +11V single supply or from ±2.25V to ±5.5V dual supplies. The common-mode input voltage range extends beyond the negative power-supply rail (ground in single-supply applications). The MAX4450/MAX4451 require only 6.5mA of quiescent supply current per op amp while achieving a 210MHz -3dB bandwidth and a 485V/µs slew rate. Both devices are an excellent solution in low-power/lowvoltage systems that require wide bandwidth, such as video, communications, and instrumentation. The MAX4450 is available in the ultra-small 5-pin SC70 package, while the MAX4451 is available in a spacesaving 8-pin SOT23. MAX4450/MAX4451 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs 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 = +70°C) 5-Pin SC70-5 (derate 2.5mW/°C above +70°C) ..........200mW 5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ........571mW 8-Pin SOT23-8 (derate 5.26mW/°C above +70°C) ......421mW 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, 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 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 = 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 Input Common-Mode Voltage Range VCM Input Offset Voltage (Note 2) VOS CONDITIONS Guaranteed by CMRR test MIN VEE 0.20 4 Input Offset Voltage Matching Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Open-Loop Gain (Note 2) TCVOS Power-Supply Rejection Ratio (Note 3) 26 mV 1.0 mV 8 µV/°C 6.5 20 0.5 4 Differential mode (-1V ≤ VIN ≤ +1V) 70 kΩ RIN CMRR AVOL Common mode (-0.2V ≤ VCM ≤ +2.75V) ISC 3 MΩ 95 dB 0.25V ≤ VOUT ≤ 4.75V, RL = 2kΩ 50 60 0.5V ≤ VOUT ≤ 4.5V, RL = 150Ω 48 58 RL = 50Ω VCC - VOH 0.05 0.20 VOL - VEE 0.05 0.15 VCC - VOH 0.30 0.50 VOL - VEE 0.25 0.80 VCC - VOH 0.5 0.80 VOL - VEE 0.5 1.75 VCC - VOH 1.0 1.5 VOL - VEE 0.025 0.065 Sourcing 45 70 Sinking 25 50 Sinking or sourcing VS Quiescent Supply Current (per amplifier) IS VCC = 5V VCC to VEE dB 57 ROUT PSRR µA 70 VOUT IOUT µA (VEE - 0.2V) ≤ VCM ≤ (VCC - 2.25V) RL = 150Ω Operating Supply-Voltage Range 2 V (Note 2) RL = 75Ω to ground Open-Loop Output Resistance VCC 2.25 (Note 2) RL = 75Ω Output Short-Circuit Current UNITS IB RL = 2kΩ Output Current MAX IOS 1V ≤ VOUT ≤ 4V, RL = 50Ω Output Voltage Swing (Note 2) TYP V mA ±120 mA 8 Ω VEE = 0, VCM = 2V 46 62 VEE = -5V, VCM = 0 54 69 4.5 6.5 _______________________________________________________________________________________ dB 11.0 V 9.0 mA Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs (VCC = +5V, VEE = 0, VCM = +2.5V, RF = 24Ω, RL = 100Ω to VCC/2, VOUT = VCC/2, AVCL = +1V/V, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL Small-Signal -3dB Bandwidth BWSS VOUT = 100mVp-p 210 MHz Large-Signal -3dB Bandwidth BWLS VOUT = 2Vp-p 175 MHz VOUT = 100mVp-p 55 MHz Bandwidth for 0.1dB Gain Flatness BW0.1dB CONDITIONS MIN TYP MAX UNITS Slew Rate SR VOUT = 2V step 485 V/µs Settling Time to 0.1% tS VOUT = 2V step 16 ns 4 ns -65 dBc Rise/Fall Time tR, tF VOUT = 100mVp-p Spurious-Free Dynamic Range SFDR fC = 5MHz, VOUT = 2Vp-p Harmonic Distortion Two-Tone, Third-Order Intermodulation Distortion Channel-to-Channel Isolation HD IP3 CHISO Input 1dB Compression Point fC = 5MHz, VOUT = 2Vp-p 2nd harmonic -65 3rd harmonic -58 Total harmonic distortion -63 dBc f1 = 4.7MHz, f2 = 4.8MHz, VOUT = 1Vp-p 66 dBc Specified at DC 102 dB fC = 10MHz, AVCL = +2V/V 14 dBm degrees Differential Phase Error DP NTSC, RL = 150Ω 0.08 Differential Gain Error DG NTSC, RL = 150Ω 0.02 % Input Noise-Voltage Density en f = 10kHz 10 nV/√Hz in f = 10kHz 1.8 pA/√Hz 1 pF 1.5 Ω Input Noise-Current Density Input Capacitance CIN Output Impedance ZOUT f = 10MHz Note 1: All devices are 100% production tested at TA = +25°C. 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 = 0, VCC = +4.5V to +5.5V; PSR for dual ±5V supply tested with VEE = -4.5V to -5.5V, VCC = +4.5V to +5.5V. _______________________________________________________________________________________ 3 MAX4450/MAX4451 AC ELECTRICAL CHARACTERISTICS Typical Operating Characteristics (VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.) 1 1 0.1 0 0 GAIN (dB) 0.2 -1 -2 -0.2 -3 -3 -0.3 -4 -4 -0.4 -5 -5 -0.5 -6 -0.6 -2 100M 1G 100k 1M 10M FREQUENCY (Hz) OUTPUT IMPEDANCE vs. FREQUENCY 100k 1G DISTORTION vs. FREQUENCY VOUT = 2Vp-p AVCL = +1V/V -10 -20 DISTORTION (dBc) 10 1 0.1 -30 -50 2ND HARMONIC -60 100k VOUT = 2Vp-p AVCL = +5V/V 1M -60 3RD HARMONIC -40 -50 -60 -90 -90 -100 10M FREQUENCY (Hz) 100M fO = 5MHz AVCL = +1V/V -10 -20 -30 -40 -50 3RD HARMONIC -60 -70 2ND HARMONIC 2ND HARMONIC -80 -80 -100 100M DISTORTION vs. VOLTAGE SWING -30 -70 -80 10M 0 DISTORTION (dBc) -50 1M 1M FREQUENCY (Hz) fO = 5MHz VOUT = 2Vp-p AVCL = +1V/V -10 DISTORTION (dBc) 2ND HARMONIC 100k 100k 100M 0 -20 -70 10M DISTORTION vs. RESISTIVE LOAD -30 -40 3RD HARMONIC FREQUENCY (Hz) MAX4450-07 -10 -60 -100 1G DISTORTION vs. FREQUENCY -20 2ND HARMONIC -50 -90 FREQUENCY (Hz) 0 -30 -40 -80 MAX4450-08 100M 1G -70 3RD HARMONIC -100 10M VOUT = 2Vp-p AVCL = +2V/V -10 -20 -90 0.01 100M DISTORTION vs. FREQUENCY -40 -80 1M 10M 0 -70 100k 1M FREQUENCY (Hz) 0 MAX4450-04 100 100M FREQUENCY (Hz) MAX4450-06 10M DISTORTION (dBc) 1M MAX4450-05 100k 4 0 -0.1 MAX4450-09 -1 VOUT = 100mVp-p 0.3 2 -6 IMPEDANCE (Ω) MAX4450-02 VOUT = 2Vp-p 3 0.4 2 GAIN (dB) GAIN (dB) MAX4450-01 VOUT = 100mVp-p 3 GAIN FLATNESS vs. FREQUENCY LARGE-SIGNAL GAIN vs. FREQUENCY 4 MAX4450-03 SMALL-SIGNAL GAIN vs. FREQUENCY 4 DISTORTION (dBc) MAX4450/MAX4451 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs 3RD HARMONIC -90 -100 0 200 400 600 RLOAD (Ω) 800 1000 1200 0.5 1.0 1.5 VOLTAGE SWING (Vp-p) _______________________________________________________________________________________ 2.0 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs COMMON-MODE REJECTION vs. FREQUENCY 0 IRE -30 -40 -40 -50 -60 MAX4450-13 1.2 -70 -80 -80 -90 -90 -100 -100 100k VCC - VOH 0.8 0.6 10M 100M 1G 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) SMALL-SIGNAL PULSE RESPONSE SMALL-SIGNAL PULSE RESPONSE INPUT 50mV/div OUTPUT 50mV/div VOL - VEE 0.4 1M 1G INPUT 25mV/div VOLTAGE (V) 1.0 -60 VOLTAGE (V) OUTPUT VOLTAGE SWING (V) 1.4 -50 -70 100 MAX4450-12 -20 -30 OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD 1.6 MAX4450-11 -20 MAX4450-15 0.12 0.10 0.08 0.06 0.04 0.02 0 -0.02 -0.04 0 -10 PSR (dB) 100 POWER-SUPPLY REJECTION vs. FREQUENCY MAX4450-14 IRE -10 CMR (dB) 0.025 0.020 0.015 0.010 0.005 0 -0.005 -0.010 0 DIFF PHASE (degrees) 0 MAX4450-10 DIFF GAIN (%) DIFFERENTIAL GAIN AND PHASE OUTPUT 50mV/div RF = 24Ω AVCL = +1V/V 0.2 RF = 500Ω AVCL = +2V/V 0 0 20ns/div 50 100 150 200 250 300 350 400 450 500 20ns/div RLOAD (Ω) LARGE-SIGNAL PULSE RESPONSE RF = 500Ω AVCL = +5V/V OUTPUT 1V/div RF = 500Ω AVCL = +2V/V RF = 24Ω AVCL = +1V/V 20ns/div INPUT 500mV/div VOLTAGE (V) VOLTAGE (V) OUTPUT 1V/div OUTPUT 50mV/div MAX4450-18 INPUT 1V/div VOLTAGE (V) INPUT 10mV/div LARGE-SIGNAL PULSE RESPONSE MAX4450-17 MAX4450-16 SMALL-SIGNAL PULSE RESPONSE 20ns/div 20ns/div _______________________________________________________________________________________ 5 MAX4450/MAX4451 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.) LARGE-SIGNAL PULSE RESPONSE CURRENT NOISE (pA/√Hz) VOLTAGE NOISE (pA/√Hz) INPUT 1V/div 10 RF = 500Ω AVCL = +2V/V RL = 100Ω 1 10 100 10 RL = 100Ω 1 1 20ns/div MAX4450-21 100 MAX4450-20 100 MAX4450-19 INPUT 1V/div CURRENT NOISE vs. FREQUENCY VOLTAGE NOISE vs. FREQUENCY VOLTAGE (V) 1k 10k 100k 1M 1 10M 10 ISOLATION RESISTANCE vs. CAPACITIVE LOAD 10k 250 BANDWIDTH (MHz) 14 SMALL SIGNAL (VOUT = 100mVp-p) 12 MAX4450-23 300 MAX4450-22 15 RISO (Ω) 1k SMALL-SIGNAL BANDWIDTH vs. LOAD RESISTANCE 16 13 100 11 200 150 100 50 10 LARGE SIGNAL (VOUT = 2Vp-p) 0 9 0 0 50 100 150 200 250 300 350 400 450 500 100 200 300 400 500 600 700 800 CLOAD (pF) RLOAD (Ω) OPEN-LOOP GAIN vs. RESISTIVE LOAD MAX4451 CROSSTALK vs. FREQUENCY 70 MAX4450-25 60 MAX4450-24 80 40 20 CROSSTALK (dB) 60 50 40 30 -40 -60 -100 10 -120 0 -140 100 1k RLOAD (Ω) 6 0 -20 -80 20 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) OPEN-LOOP GAIN (dBc) MAX4450/MAX4451 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs 0.1M 1M 10M 100M FREQUENCY (Hz) _______________________________________________________________________________________ 1G 1M 10M Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs PIN NAME FUNCTION MAX4450 MAX4451 1 — OUT Amplifier Output 2 4 VEE Negative Power Supply or Ground (in singlesupply operation) 3 — IN+ Noninverting Input 4 — IN- Inverting Input 5 8 VCC Positive Power Supply — 1 OUTA — 2 INA- Amplifier A Inverting Input — 3 INA+ Amplifier A Noninverting Input — 7 OUTB Amplifier B Output — 6 INB- Amplifier B Inverting Input — 5 INB+ Amplifier B Noninverting Input Amplifier A Output 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 1kΩ 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 1kΩ resistors to 100Ω extends the pole frequency to 1.59GHz, but could limit output swing by adding 200Ω in parallel with the amplifier’s load resistor. Table 1 lists suggested feedback and gain resistors, and bandwidths for several gain values in the configurations shown in Figures 1a and 1b. Layout and Power-Supply Bypassing These amplifiers operate from a single +4.5V to +11V power supply or from dual ±2.25V to ±5.5V supplies. For single-supply operation, bypass VCC to ground with a RF RG Detailed Description The MAX4450/MAX4451 are single-supply, rail-to-rail, voltage-feedback amplifiers that employ current-feedback techniques to achieve 485V/µs 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 55mV 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. Applications Information Choosing Resistor Values Unity-Gain Configuration The MAX4450/MAX4451 are internally compensated for unity gain. When configured for unity gain, the devices require a 24Ω resistor (RF) in series with the feedback path. This resistor improves AC response by reducing the Q of the parallel LC circuit formed by the parasitic feedback capacitance and inductance. RTO VOUT MAX445 _ IN VOUT = [1+ (RF / RG)] VIN RO RTIN Figure 1a. Noninverting Gain Configuration RF RG IN RTIN RTO VOUT MAX445 _ VOUT = -(RF / RG) VIN RO RS Figure 1b. Inverting Gain Configuration _______________________________________________________________________________________ 7 MAX4450/MAX4451 Pin Description MAX4450/MAX4451 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs Table 1. Recommended Component Values GAIN (V/V) COMPONENT +1 -1 +2 -2 +5 -5 +10 -10 +25 -25 RF (Ω) 24 500 500 500 500 500 500 500 500 1200 RG (Ω) ∞ 500 500 250 124 100 56 50 20 50 RS (Ω) — 0 — 0 — 0 — 0 — 0 RTIN (Ω) 49.9 56 49.9 62 49.9 100 49.9 ∞ 49.9 ∞ RTO (Ω) 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 49.9 Small-Signal -3dB Bandwidth (MHz) 210 100 95 50 25 25 11 15 5 10 Note: RL = RO + RTO; RTIN and RTO are calculated for 50Ω applications. For 75Ω systems, RTO = 75Ω; calculate RTIN from the following equation: 75 R TIN = Ω 75 1RG 0.1µF capacitor as close to the pin as possible. If operating with dual supplies, bypass each supply with a 0.1µF capacitor. 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 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. 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. The output swings to within 55mV of either powersupply rail with a 2kΩ load. The input ground sensing 8 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. Output Capacitive Loading and Stability The MAX4450/MAX4451 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 optimal isolation resistor (RS) 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 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. Figure 5 shows the effect of a 27Ω 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. _______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 RF RG RISO VOUT MAX445 _ VIN CL ISOLATION RESISTANCE, RISO (Ω) 30 50Ω RTIN 25 20 15 10 5 0 0 Figure 2. Driving a Capacitive Load Through an Isolation Resistor 100 150 200 CAPACITIVE LOAD, CL (pF) 250 Figure 3. Capacitive Load vs. Isolation Resistance 3 6 5 2 CL = 15pF RISO = 27Ω CL = 47pF 1 4 3 0 2 -1 GAIN (dB) GAIN (dB) 50 CL = 10pF 1 0 CL = 5pF -1 CL = 68pF -2 CL = 120pF -3 -4 -2 -5 -3 -6 -7 -4 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 4. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 5. Small-Signal Gain vs. Frequency with Load Capacitance and 27Ω Isolation Resistor _______________________________________________________________________________________ 9 Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451 Pin Configurations (continued) Chip Information MAX4450 TRANSISTOR COUNT: 86 TOP VIEW MAX4451 TRANSISTOR COUNT: 170 OUTA 1 8 VCC 7 OUTB 3 6 INB- VEE 4 5 INB+ INA- 2 MAX4451 INA+ SOT23-8/SO 10 ______________________________________________________________________________________ Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs SC70, 5L.EPS SOT5L.EPS ______________________________________________________________________________________ 11 MAX4450/MAX4451 Package Information Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs SOICN.EPS SOT23, 8L.EPS MAX4450/MAX4451 Package Information (continued) 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 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.