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19-1522; Rev 1; 9/99
Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs
General Description
The MAX4450 single and MAX4451 dual op amps are unity-gain-stable devices that combine high-speed performance with Rail-to-Rail(R) 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 while achieving a 210MHz -3dB bandwidth and a 485V/s slew rate. Both devices are an excellent solution in low-power/low-voltage 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 space-saving 8-pin SOT23.
Features
o Ultra-Small SC70-5, SOT23-5, and SOT23-8 Packages o Low Cost o High Speed 210MHz -3dB Bandwidth 55MHz 0.1dB Gain Flatness 485V/s Slew Rate o Single +4.5V to +11V Operation o Rail-to-Rail Outputs o Input Common-Mode Range Extends Beyond VEE o Low Differential Gain/Phase: 0.02%/0.08 o Low Distortion at 5MHz -65dBc SFDR -63dB Total Harmonic Distortion o High Output Drive: 80mA
MAX4450/MAX4451
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 MAX4450EXK-T MAX4450EUK-T MAX4451EKA-T* MAX4451ESA* 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 AAA ADKP AAAA --
*Future product--contact factory for availability.
Typical Operating Circuit
RF 24 RTO 50
Pin Configurations
TOP VIEW
OUT 1 5 VCC
MAX4450
IN RTIN 50
ZO = 50
VOUT VEE 2 RO 50
MAX4450
IN+ 3
4
IN-
UNITY-GAIN LINE DRIVER (RL = RO + RTO)
SC70/SOT23
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 1-800-835-8769.
Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
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 SC70-5 (derate 2.5mW/C above +70C) ..........200mW 5-Pin SOT23-5 (derate 7.1mW/C above +70C) ........571mW 8-Pin SOT23-8 (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, 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 = 0, RL = to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Input Common-Mode Voltage Range Input Offset Voltage (Note 2) Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Open-Loop Gain (Note 2) SYMBOL VCM VOS TCVOS IB IOS RIN CMRR AVOL (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 VOUT RL = 75 RL = 75 to ground Output Current Output Short-Circuit Current Open-Loop Output Resistance Power-Supply Rejection Ratio (Note 3) Operating Supply-Voltage Range Quiescent Supply Current (per amplifier) IOUT ISC ROUT PSRR VS IS VCC = 5V, VEE = 0, VCM = 2V VCC = 5V, VEE = -5V, VCM = 0 VCC to VEE 46 54 4.5 6.5 RL = 20 to VCC or VEE Sinking or sourcing VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE 40 70 50 48 CONDITIONS Guaranteed by CMRR test MIN VEE 0.20 4 8 6.5 0.5 70 3 95 60 58 57 0.05 0.05 0.30 0.25 0.5 0.5 1.0 0.025 80 120 8 62 69 11.0 9.0 200 150 500 800 800 1.3 1.5 0.05 mA mA dB V mA mV dB 20 4 TYP MAX VCC 2.25 26 UNITS V mV V/C A A k M dB
Output Voltage Swing (Note 2)
2
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0, VCM = +2.5V, RF = 24, RL = 100 to VCC/2, VOUT = VCC/2, 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 = 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 55 485 16 4 -65 -65 -58 -63 66 14 0.08 0.02 10 1.8 1 f = 10MHz 1.5 dBc dBm degrees % nV/Hz pA/Hz pF dBc MAX UNITS MHz MHz MHz V/s ns ns dBc
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 Output Impedance
IP3
f1 = 4.7MHz, f2 = 4.8MHz, VOUT = 1Vp-p fC = 10MHz, AVCL = +2V/V
DP DG en in CIN ZOUT
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. Note 2: Tested with VCM = +2.5V. Note 3: PSR for single +5V supply tested with VEE = 0, VCC = +4.5V to +5.5V; for dual 5V supply tested with VEE = -4.5V to -5.5V, VCC = +4.5V to +5.5V.
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
Typical Operating Characteristics
(VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.)
MAX4450
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4450-01
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4450-02
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
MAX4450-03
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
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4450-04
DISTORTION vs. FREQUENCY
MAX4450-05
DISTORTION vs. FREQUENCY
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p AVCL = +2V/V
MAX4450-06
100
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 2ND HARMONIC VOUT = 2Vp-p AVCL = +1V/V
0
10 IMPEDANCE ()
1
0.1
-80 -90
3RD HARMONIC
-80 -90 -100
0.01 100k 1M 10M FREQUENCY (Hz) 100M 1G
-100 100k 1M 10M 100M FREQUENCY (Hz)
100k
1M
10M
100M
FREQUENCY (Hz)
DISTORTION vs. FREQUENCY
MAX4450-07
MAX4450-08
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100
VOUT = 2Vp-p AVCL = +5V/V
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90
fO = 5MHz VOUT = 2Vp-p AVCL = +1V/V
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80
fO = 5MHz AVCL = +1V/V
2ND HARMONIC
3RD HARMONIC
3RD HARMONIC
2ND HARMONIC 3RD HARMONIC
2ND HARMONIC
-90 -100 800 1000 1200 0.5 1.0 1.5 2.0
100k
1M
10M
100M
-100 0 200 400 600 RLOAD ()
FREQUENCY (Hz)
VOLTAGE SWING (Vp-p)
4
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MAX4450-09
0
DISTORTION vs. RESISTIVE LOAD
0
DISTORTION vs. VOLTAGE SWING
0
Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.)
MAX4450
DIFFERENTIAL GAIN AND PHASE
MAX4450-10
COMMON-MODE REJECTION vs. FREQUENCY
MAX4450-11
POWER-SUPPLY REJECTION vs. FREQUENCY
-10 -20 -30 PSR (dB) -40 -50 -60 -70 -80 -90 -100
MAX4450-12
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 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100
0
IRE
100
100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD
1.4 OUTPUT VOLTAGE SWING (V) 1.2 1.0 0.8 0.6 0.4 0.2 0 0 50 100 150 200 250 300 350 400 450 500 RLOAD () VOL - VEE VCC - VOH
MAX4450-13
SMALL-SIGNAL PULSE RESPONSE
MAX4450-14
SMALL-SIGNAL PULSE RESPONSE
MAX4450-15
1.6
INPUT 50mV/div VOLTAGE (V)
INPUT 25mV/div VOLTAGE (V) OUTPUT 50mV/div
OUTPUT 50mV/div RF = 24 AVCL = +1V/V 20ns/div
RF = 500 AVCL = +2V/V 20ns/div
SMALL-SIGNAL PULSE RESPONSE
MAX4450-16
LARGE-SIGNAL PULSE RESPONSE
MAX4450-17
LARGE-SIGNAL PULSE RESPONSE
MAX4450-18
INPUT 10mV/div VOLTAGE (V)
INPUT 1V/div VOLTAGE (V)
INPUT 500mV/div VOLTAGE (V) OUTPUT 1V/div
OUTPUT 50mV/div RF = 500 AVCL = +5V/V 20ns/div
OUTPUT 1V/div RF = 24 AVCL = +1V/V 20ns/div
RF = 500 AVCL = +2V/V 20ns/div
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = +2.5V, AVCL = +1V/V, RF = 24, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.)
MAX4450
MAX4450 LARGE-SIGNAL PULSE RESPONSE
MAX4450-19
MAX4450 VOLTAGE NOISE vs. FREQUENCY
MAX4450-20
MAX4450 CURRENT NOISE vs. FREQUENCY
MAX4450-21
100
100
VOLTAGE NOISE (nV/Hz)
CURRENT NOISE (pA/Hz) RL = 100 1 10 100 1k 10k 100k 1M 10M
INPUT 1V/div VOLTAGE (V)
10
10
INPUT 1V/div RF = 500 AVCL = +2V/V
1 20ns/div
1 1 FREQUENCY (Hz)
RL = 100 10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
MAX4450 ISOLATION RESISTANCE vs. CAPACITIVE LOAD
MAX4450-22
MAX4450 SMALL-SIGNAL BANDWIDTH vs. LOAD RESISTANCE
MAX4450-23
MAX4450 OPEN-LOOP GAIN vs. RESISTIVE LOAD
70 OPEN-LOOP GAIN (dBc) 60 50 40 30 20
MAX4450-24
16 15 14 RISO () 13 12 11 10 LARGE SIGNAL (VOUT = 2Vp-p) 9 0 SMALL SIGNAL (VOUT = 100mVp-p)
300 250 BANDWIDTH (MHz) 200 150 100 50 0
80
10 0 0 100 200 300 400 500 600 700 800 RLOAD () 100 1k RLOAD () 10k
50 100 150 200 250 300 350 400 450 500 CLOAD (pF)
6
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs
Pin Description
PIN MAX4450 1 2 3 4 5 -- -- -- -- -- -- MAX4451 -- 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
require a 24 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.
MAX4450/MAX4451
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 lists suggested feedback and gain resistors, and bandwidths for several gain values in the configurations shown in Figures 1a and 1b.
RG RF
Detailed Description
The MAX4450/MAX4451 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 55mV of each supply rail. Local feedback around the output stage ensures 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 80mA drive capability, while constraining total supply current to less than 9mA. The input stage permits common-mode voltages beyond the negative supply and to within 2.25V of the positive supply rail.
MAX445 _
RTO
VOUT
IN RTIN
VOUT = [1+ (RF / RG)] VIN
RO
Figure 1a. Noninverting Gain Configuration
RG IN RTIN
RF
RTO
MAX445 _
VOUT
Applications Information
Choosing Resistor Values
Unity-Gain Configuration The MAX4450/MAX4451 are internally compensated for unity gain. When configured for unity gain, the devices
RS
VOUT = -(RF / RG) VIN
RO
Figure 1b. Inverting Gain Configuration
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
Table 1. Recommended Component Values
GAIN (V/V) COMPONENT +1 RF () RG () RS () RTIN () RTO () Small-Signal -3dB Bandwidth (MHz) 24 -- 49.9 49.9 210 -1 500 500 0 56 49.9 100 +2 500 500 -- 49.9 49.9 95 -2 500 250 0 62 49.9 50 +5 500 124 -- 49.9 49.9 25 -5 500 100 0 100 49.9 25 +10 500 56 -- 49.9 49.9 11 -10 500 50 0 49.9 15 +25 500 20 -- 49.9 49.9 5 -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
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 0.1F capacitor as close to the pin as possible. If operating with dual supplies, bypass each supply with a 0.1F 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 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.
8
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs
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 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.
MAX4450/MAX4451
30 ISOLATION RESISTANCE, RISO () 25 20 15 10 5 0 0 50 100 150 200 CAPACITIVE LOAD (pF) 250
RG
RF
RISO
MAX445 _
VOUT CL
VIN RTIN 50
Figure 2. Driving a Capacitive Load Through an Isolation Resistor
Figure 3. 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 = 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
9
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
Pin Configurations (continued)
TOP VIEW
Chip Information
MAX4550 TRANSISTOR COUNT: 86 MAX4551 TRANSISTOR COUNT: 170 SUBSTRATE CONNECTED TO VEE.
OUTA 1 INA- 2
8 7
VCC OUTB INBINB+
MAX4451
INA+ 3 6 5 VEE 4
SOT23/SO
10
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Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs
Package Information
SC70, 5L.EPS
MAX4450/MAX4451
______________________________________________________________________________________
SOT5L.EPS
11
Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs MAX4450/MAX4451
Package Information (continued)
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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