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19-1950; Rev 1; 4/01
Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown
General Description
The MAX4465-MAX4469 are micropower op amps optimized for use as microphone preamplifiers. They provide the ideal combination of an optimized gain bandwidth product vs. supply current, and low voltage operation in ultra-small packages. The MAX4465/ MAX4467/MAX4469 are unity-gain stable and deliver a 200kHz gain bandwidth from only 24A of supply current. The MAX4466/MAX4468 are decompensated for a minimum stable gain of +5V/V and provide a 600kHz gain bandwidth product. In addition, these amplifiers feature Rail-to-Rail(R) outputs, high AVOL, plus excellent power-supply rejection and common-mode rejection ratios for operation in noisy environments. The MAX4467/MAX4468 include a complete shutdown mode. In shutdown, the amplifiers' supply current is reduced to 5nA and the bias current to the external microphone is cut off for ultimate power savings. The single MAX4465/MAX4466 are offered in the ultra-small 5-pin SC70 package, while the single with shutdown MAX4467/MAX4468 and dual MAX4469 are available in the space-saving 8-pin SOT23 package.
Features
o +2.4V to +5.5V Supply Voltage Operation o Versions with 5nA Complete Shutdown Available (MAX4467/MAX4468) o Excellent Power-Supply Rejection Ratio: 112dB o Excellent Common-Mode Rejection Ratio: 126dB o High AVOL: 125dB (RL = 100k) o Rail-to-Rail Outputs o Low 24A Quiescent Supply Current o Gain Bandwidth Product: 200kHz (MAX4465/MAX4467/MAX4469) 600kHz AV 5 (MAX4466/MAX4468) o Available in Space-Saving Packages 5-Pin SC70 (MAX4465/MAX4466) 8-Pin SOT23 (MAX4467/MAX4468/MAX4469)
MAX4465-MAX4469
Ordering Information
PART TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 5 SC70-5 5 SOT23-5 5 SC70-5 5 SOT23-5 MAX4465EXK-T MAX4465EUK-T MAX4466EXK-T MAX4466EUK-T
Applications
Microphone Preamplifiers Hearing Aids Cellular Phones Voice-Recognition Systems Digital Dictation Devices Headsets Portable Computing
Ordering Information continued at end of data sheet.
Typical Operating Circuit
VCC SHDN MIC_BIAS CBIAS RDC IN+ OUT CIN RIN IN-
Pin Configurations
RBIAS
TOP VIEW
IN+ 1 5 VCC
RBIAS
GND 2
MAX4465 MAX4466
4 OUT
IN- 3
CBYPASS
RDC GND
MAX4467 MAX4468
SC70/SOT23
Pin Configurations continued at end of data sheet. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
MICROPHONE CAPSULE RFB MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH COMPLETE SHUTDOWN
________________________________________________________________ Maxim Integrated Products
1
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to GND)................................................+6V All Other Pins to GND.................................-0.3V to (VCC + 0.3V) Output Short-Circuit Duration OUT Shorted to GND or VCC .................................Continuous 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 5.3mW/C above +70C) ...........421mW 8-Pin SO (derate 5.88mW/C above +70C) ...............471mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+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 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.
ELECTRICAL CHARACTERISTICS
(VCC = +5V, VCM = 0, VOUT = VCC/2, RL = to VCC/2, SHDN = GND (MAX4467/MAX4468 only). TA = TMIN to TMAX, unless otherwise noted. Typical values specified at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range Supply Current (Per Amplifier) Supply Current in Shutdown Input Offset Voltage Input Bias Current Input Offset Current Range Input Common-Mode Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio SYMBOL VCC ICC I SHDN VOS IB IOS VCM CMRR PSRR VCM = -0.1V VCM = -0.1V Inferred from CMRR test -0.1V VCM VCC - 1V 2.4V VCC 5.5V MAX4465/MAX4467/MAX4469, f = 3.4kHz MAX4466/MAX4468, f = 3.4kHz RL = 100k to VCC/2, 0.05V VOUT VCC - 0.05V RL = 10k to VCC/2, 0.1V VOUT VCC - 0.1V 80 RL = 100k RL = 10k RL = 100k RL = 10k To either supply rail SHDN = VCC, 0 VOUT VCC ; (Notes 2, 3) VIL VIH (Note 2) (Note 2) (Note 2) GBWP MAX4465/MAX4467/MAX4469 MAX4466/MAX4468 VCC 0.7 2 200 600 25 -0.1 80 80 126 112 75 80 125 dB 95 10 16 10 14 15 0.5 100 VCC 0.3 50 50 mV mV mA nA V V nA kHz dB TA = +25C TA = TMIN to TMAX SHDN = VCC (Note 2) 5 1 2.5 1 CONDITIONS Inferred from PSRR test MIN 2.4 24 TYP MAX 5.5 48 60 50 5 100 15 VCC - 0.1 UNITS V A nA mV nA nA V dB
Open-Loop Gain
AVOL
Output Voltage Swing High Output Voltage Swing Low Output Short-Circuit Current Output Leakage Current in Shutdown SHDN Logic Low SHDN Logic High SHDN Input Current Gain Bandwidth Product
VOH VOL
IVCC - VOHI
2
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VCM = 0, VOUT = VCC/2, RL = to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA = TMIN to TMAX, unless otherwise noted. Typical values specified at TA = +25C.) (Note 1)
PARAMETER Channel-to-Channel Isolation Phase Margin Gain Margin OM SYMBOL CONDITIONS MAX4469 only, f = 1kHz RL = 100k RL = 100k MAX4465/MAX4467/ MAX4469, AV = +1 MAX4466/MAX4468, AV = +5 Input Noise Voltage Density Total Harmonic Distortion en THD f = 1kHz f = 1kHz, RL = 10k, VOUT = 2Vp-p MAX4465/MAX4467/ MAX4469 MAX4466/MAX4468 MIN TYP 85 70 20 45 mV/s 300 80 0.02 0.03 100 100 1 50 40 20 500 s s s pF nV/Hz % MAX UNITS dB degrees dB
MAX4465-MAX4469
Slew Rate
SR
Output step = 4V
Capacitive Load Stability SHDN Delay Time Enable Delay Time Power-On Time Bias Switch On-Resistance
CLOAD t SHDN tEN tON RS
MAX4465/MAX4467/MAX4469, AV = +1 MAX4466/MAX4468, AV = +5 (Note 2) (Note 2) (Note 2) IS = 5mA (Note 2)
Note 1: All specifications are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. Note 2: Shutdown mode is available only on the MAX4467/MAX4468. Note 3: External feedback networks not considered.
Typical Operating Characteristics
(VCC = +5V, VCM = 0, VOUT = VCC/2, RL= 100k to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA = +25C, unless otherwise noted.)
MAX4465/MAX4467/MAX4469 GAIN AND PHASE vs. FREQUENCY (NO LOAD)
140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz) 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 1 10 100 1k 10k 100k FREQUENCY (Hz)
MAX4465-69 toc01
MAX4466/MAX4468 GAIN AND PHASE vs. FREQUENCY (NO LOAD)
MAX4465-69 toc02
MAX4465/MAX4467/MAX4469 GAIN AND PHASE vs. FREQUENCY (CL = 100pF)
140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz)
MAX4465-69 toc03
GAIN (dB)/PHASE (DEGREES)
GAIN (dB)/PHASE (DEGREES)
GAIN (dB)/PHASE (DEGREES)
1M
1M
1M
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0, VOUT = VCC/2, RL= 100k to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA = +25C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4465-69 toc04
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX4465-69 toc05
SUPPLY CURRENT vs. TEMPERATURE
MAX4465-69 toc06
10,000
-10 -30 -50 -70 -90 -110 -130 10 100 1k 10k 100k
VSHDN = VCC
27
SUPPLY CURRENT (pA)
SUPPLY CURRENT (A) -40 -15 10 35 60 85
1000
26
PSRR (dB)
25
100
24
10
23
1 1M FREQUENCY (Hz) TEMPERATURE (C)
22 -40 -15 10 35 60 85 TEMPERATURE (C)
OUTPUT LEAKAGE CURRENT vs. TEMPERATURE
CHANNEL-TO-CHANNEL ISOLATION (dB) VSHDN = VCC VOUT = VCC/2
MAX4465-69 toc07
CHANNEL-TO-CHANNEL ISOLATION vs. FREQUENCY
MAX4465-69 toc08
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4465-69 toc09
1000
0
600 400 200 VOS (V)
-20
100 ILEAK (pA)
-40
10
0 -200
-60
1
-80
-400 -600 0.1 1 10 FREQUENCY (kHz) 100 1000 -40 -15 10 35 60 85 TEMPERATURE (C)
0.1 -40 -15 10 35 60 85 TEMPERATURE (C)
-100
OUTPUT VOLTAGE SWING HIGH vs. TEMPERATURE
MAX4465-69 toc10
OUTPUT VOLTAGE SWING LOW vs. TEMPERATURE
MAX4465-69 toc11
COMMON-MODE REJECTION RATIO vs. TEMPERATURE
-102 -104 -106
MAX4465-69 toc12
5
5
-100
4 VDD - VOUT (mV)
4 VOUT - VSS (mV)
3
3
CMRR (dB)
-108 -110 -112 -114
2
2
1
1
-116 -118
0 -40 -15 10 35 60 85 TEMPERATURE (C)
0 -40 -15 10 35 60 85 TEMPERATURE (C)
-120 -40 -15 10 35 60 85 TEMPERATURE (C)
4
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0, VOUT = VCC/2, RL= 100k to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA = +25C, unless otherwise noted.)
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4465-69 toc13
LARGE-SIGNAL GAIN vs. TEMPERATURE
MAX4465-69 toc14
MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
MAX4465-69 toc15
130 125 120 115 GAIN (dB)
130
1.6 1.5 1.4
125 GAIN (dB)
105 100 95 90 85 80 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VOUT (V)
VMIN (V)
110
120
1.3 1.2
115 1.1 110 -40 -15 10 35 60 85 TEMPERATURE (C) 1.0 -40 -15 10 35 60 85 TEMPERATURE (C)
MAX4465/MAX4467/MAX4469 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4465-69 toc16
MAX4466/MAX4468 TOTAL HARMONIC DISTORTION vs. FREQUENCY
VOUT = 2Vp-p AV = +10V/V BW = 22kHz
MAX4465-69 toc17
MAX4465/MAX4467/MAX4469 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT AMPLITUDE
f = 1kHz AV = +1V/V BW = 122kHz
MAX4465-69 toc18
100 VOUT = 2Vp-p AV = +1V/V BW = 22kHz
100
100
10 THD + N (%)
10 THD + N (%)
10 THD + N (%)
1 RL = 10k 0.1 RL = 100k 0.01
1
RL = 10k
1 RL = 10k
0.1
0.1
0.01 0.001 20 200 2k 20k 20
RL = 100k
0.01 0.001 RL = 100k 0 0.5 1.0 1.5 VIN (Vp-p) 2.0 2.5 3.0
0.001 FREQUENCY (Hz)
200
2k
20k
FREQUENCY (Hz)
MAX4466/MAX4468 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT AMPLITUDE
f = 1kHz AV = +10V/V BW = 22kHz
MAX4465-69 toc19
NONINVERTING SMALL-SIGNAL TRANSIENT RESPONSE
MAX4465-69 toc20
NONINVERTING LARGE-SIGNAL TRANSIENT RESPONSE
MAX4465-69 toc21
100
10 THD + N (%)
1 RL = 10k 0.1 50mV/div 2V/div
0.01 0.001 0 0.05 0.10
RL = 100k
0.15 VIN (Vp-p)
0.20
0.25
0.30
20s/div
200s/div
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0, VOUT = VCC/2, RL= 100k to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4465-69 toc22
eNOISE vs. FREQUENCY
220 190 eNOISE (nVHz) 160 130 100 AVCL = +1V/V
MAX4465-69 toc23
40
SUPPLY CURRENT (A)
30
20
10 70 0 0 1 2 3 4 5 SUPPLY VOLTAGE (V) 40 100 1k 10k FREQUENCY (Hz) 100k 1M
SINK CURRENT vs. OUTPUT VOLTAGE
MAX4465-69 toc24
SOURCE CURRENT vs. OUTPUT VOLTAGE
MAX4465-69 toc25
25
25
20 SINK CURRENT (mA) VCC = +5V 15
20 SOURCE CURRENT (mA)
15
VCC = +5V
10 VCC = +2.4V
10 VCC = +2.4V
5
5
0 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V)
0 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V)
Pin Description
PIN MAX4465 MAX4466 4 -- -- 3 1 2 MAX4467 MAX4468 6 (8) -- 1 (4) 2 (3) 3 (2) 4 (1) NAME MAX4469
--
FUNCTION
OUT OUTA MIC_BIAS ININ+ GND
Amplifier Output Amplifier Output A External Microphone Bias Network Switch Output Inverting Amplifier Input Noninverting Amplifier Input Ground
1 -- -- -- 4
( ) denotes S0T23 package of the MAX4467/MAX4468 6 _______________________________________________________________________________________
Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown
Pin Description (continued)
PIN MAX4465 MAX4466 5 -- -- -- -- -- -- -- MAX4467 MAX4468 7 (7) -- -- -- -- -- 8 (6) 5 (5) NAME MAX4469 8 2 3 6 5 7 -- -- VCC INAINA+ INBINB+ OUTB SHDN N.C. Positive Supply. Bypass with a 0.1F capacitor to GND. Inverting Amplifier Input A Noninverting Amplifier Input A Inverting Amplifier Input B Noninverting Amplifier Input B Amplifier Output B Active-High Shutdown Input. Connect to GND for normal operation. Connect to VCC for shutdown. Do not leave floating. No Connection. Not internally connected. FUNCTION
MAX4465-MAX4469
( ) denotes SOT23 package of the MAX4467/MAX4468.
Detailed Description
The MAX4465-MAX4469 are low-power, micropower op amps designed to be used as microphone preamplifiers. These preamplifiers are an excellent choice for noisy environments because of their high commonmode rejection and excellent power-supply rejection ratios. They operate from a single +2.4V to +5.5V supply. The MAX4465/MAX4467/MAX4469 are unity-gain stable and deliver a 200kHz gain bandwidth from only 24A of supply current. The MAX4466/MAX4468 have a minimum stable gain of +5V/V while providing a 600kHz gain bandwidth product. The MAX4467/MAX4468 feature a complete shutdown, which is active-high, and a shutdown-controlled output providing bias to the microphone. The MAX4465/ MAX4467/MAX4469 feature a slew rate suited to voice channel applications. The MAX4466/MAX4468 can be used for full-range audio, e.g., PC99 inputs.
turn off the bias to the microphone when the device is in shutdown. This can save several hundred microamps of supply current, which can be significant in low power applications. The MIC_BIAS pin provides a switched version of VCC to the bias components. Figure 3 shows some typical values.
Driving Capacitive Loads
Driving a capacitive load can cause instability in many op amps, especially those with low quiescent current. The MAX4465/MAX4467/MAX4469 are unity-gain stable for a range of capacitive loads up to 100pF. Figure 4 shows the response of the MAX4465 with an excessive capacitive load.
Applications Information
Shutdown Mode
The MAX4467 and MAX4468 feature a low-power, complete shutdown mode. When SHDN goes high, the supply current drops to 5nA, the output enters a high impedance state and the bias current to the microphone is switched off. Pull SHDN low to enable the amplifier. Do not leave SHDN floating. Figure 5 shows the shutdown waveform.
Rail-to-Rail Output Stage
The MAX4465-MAX4469 can drive a 10k load and still typically swing within 16mV of the supply rails. Figure 1 shows the output voltage swing of the MAX4465 configured with AV = +10.
Common-Mode Rejection Ratio
A microphone preamplifier ideally only amplifies the signal present on its input and converts it to a voltage appearing at the output. When used in noninverting mode, there is a small output voltage fluctuation when both inputs experience the same voltage change in the
7
Switched Bias Supply
When used as a microphone amplifier for an electret microphone, some form of DC bias for the microphone is necessary. The MAX4467/MAX4468 have the ability to
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
common mode. The ratio of these voltages is called the common-mode gain. The common-mode rejection ratio is the ratio of differential-mode gain to common-mode gain. The high CMRR properties of the MAX4465-MAX4469 provide outstanding performances when configured as a noninverting microphone preamplifier.
Power Supplies and Layout
The MAX4465-MAX4469 operate from a single +2.4V to +5.5V power supply. Bypass the power supply with a 0.1F capacitor to ground. Good layout techniques are necessary for the MAX4465-MAX4469 family. To decrease stray capacitance, minimize trace lengths by placing external components close to the op amp's pins. Surface-mount components are recommended. In systems where analog and digital grounds are available, the MAX4465-MAX4469 should be connected to the analog ground.
Power-Up
The MAX4465-MAX4469 outputs typically settle within 1s after power-up. Figure 6 shows the output voltage on power-up.
Test Circuits/Timing Diagrams
1V/div
100s/div
Figure 1. Rail-to-Rail Output Operation
+5V +5V 2k VCC = +5V 0.1F 2k 1M IN+ 1 0.01F 1M IN- 3 ELECTRET CAPSULE 10k 1F 100k 2 GND 4 OUT 5
MAX4466
100pF
Figure 2. MAX4466 Typical Application Circuit 8 _______________________________________________________________________________________
Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
Test Circuits/Timing Diagrams (continued)
VCC SHDN MIC_BIAS
1k
100k IN+
10F 2.2k 100k 0.01F INMICROPHONE INPUT
OUT
MAX4468
GND
0.1F 3.5mm SOCKET 20k
200k
47pF
Figure 3. Bias Network Circuit
CL = 2000pF
RL = 10k CL = 10pF
SHDN
50mV/div
2V/div
OUT
40s/div
400s/div
Figure 4. Small-Signal Transient Response with Excessive Capacitive Load
Figure 5. MAX4467/MAX4468 Shutdown Waveform
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
Test Circuits/Timing Diagrams (continued)
Chip Information
MAX4465/MAX4466 TRANSISTOR COUNT: 62 MAX4467/MAX4468 TRANSISTOR COUNT: 72 MAX4469 TRANSISTOR COUNT: 113 PROCESS: BiCMOS
VCC 2V/div
Ordering Information (continued)
PART TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 SOT23-8 8 SO 8 SOT23-8 8 SO 8 SOT23-8 8 SO MAX4467EKA-T MAX4467ESA MAX4468EKA-T MAX4468ESA
OUT 1V/div
20s/div
MAX4469EKA-T MAX4469ESA
Figure 6. Power-Up/Power-Down Waveform
Selector Guide
PART MAX4465 MAX4466 MAX4467 MAX4468 MAX4469 MINIMUM STABLE GAIN +1 +5 +1 +5 +1 EXTERNAL MICROPHONE SHDN No No Yes Yes No GBWP (kHz) 200 600 200 600 200 PIN-PACKAGE 5 SC70/5 SOT23 5 SC70/5 SOT23 8 SOT23/8 SO 8 SOT23/8 SO 8 SOT23/8 SO
Pin Configurations (continued)
GND IN+ INMIC_BIAS
1 2 3 4
8
OUT VCC SHDN N.C.
MIC_BIAS 1 IN- 2 IN+ 3 GND 4
8
SHDN VCC OUT N.C.
OUTA 1 INA- 2 INA+ 3 GND 4
8
VCC OUTB INBINB+
MAX4467 MAX4468
7 6 5
MAX4467 MAX4468
7 6 5
MAX4469
7 6 5
SOT23
SO
SOT23/SO
10
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown
Package Information
SC70, 5L.EPS
MAX4465-MAX4469
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
Package Information (continued)
SOT5L.EPS
12
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown
Package Information (continued)
SOT23, 8L.EPS
MAX4465-MAX4469
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Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown MAX4465-MAX4469
Package Information (continued)
SOICN.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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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