19-1950; Rev 0; 1/01 Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown Applications Microphone Preamplifiers Hearing Aids Cellular Phones Features +2.4V to +5.5V Supply Voltage Operation Version with 10nA Shutdown Available (MAX4467/MAX4468) Excellent Power-Supply Rejection Ratio: 112dB Excellent Common-Mode Rejection Ratio: 80dB Rail-to-Rail Outputs Gain Bandwidth Product: 200kHz (MAX4465/MAX4467/MAX4469) 500kHz (MAX4466/MAX4468) Low 20A Quiescent Supply Current Available in Space-Saving Packages 5-Pin SC70 (MAX4465/MAX4466) 8-Pin SOT23 (MAX4467/MAX4468/MAX4469) Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX4465EXK-T -40C to +85C 5 SC70-5 MAX4465EUK-T -40C to +85C 5 SOT23-5 MAX4466EXK-T -40C to +85C 5 SC70-5 MAX4466EUK-T -40C to +85C 5 SOT23-5 Ordering Information continued at end of data sheet. Voice-Recognition Systems Digital Dictation Devices Typical Operating Circuit Headsets Portable Computing 7 VCC Pin Configurations RBIAS SHDN 8 OUT 6 1 MIC-BIAS TOP VIEW CBIAS IN+ 1 GND 2 5 VCC MAX4465 MAX4466 IN- 3 RBIAS CIN 4 OUT RIN CBYPASS RDC 3 IN+ 2 IN- MAX4467 MAX4468 RDC GND 4 SC70/SOT23 Pin Configurations continued at end of data sheet. MICROPHONE CAPSULE RFB Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH COMPLETE SHUTDOWN ________________________________________________________________ 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. MAX4465-MAX4469 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 an ultra-small package. The MAX4465/ MAX4467/MAX4469 are unity-gain stable and deliver a 200kHz gain bandwidth from only 20A of supply current. The MAX4466/MAX4468 are decompensated for a minimum stable gain of +5V/V and provide a 500kHz gain bandwidth product. In addition these amplifiers feature Rail-to-Rail(R) outputs, 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 10nA 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 SC70-5 package, while the single with shutdown MAX4467/MAX4468 and dual MAX4469 are available in the space-saving SOT23-8 package. MAX4465-MAX4469 Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown 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 SYMBOL Supply Voltage Range VCC Supply Current (per Amplifier) ICC Supply Current in Shutdown Input Offset Voltage Input Bias Current Input Offset Current Range Input Common-Mode Common-Mode Rejection Power-Supply Rejection Open-Loop Gain I SHDN MIN TYP 2.4 TA = +25C 20 V 48 TA = TMIN to TMAX 60 A 1000 nA 5 mV IB VCM = -0.1V 10 100 nA IOS VCM = -0.1V 1 10 nA VCM Inferred from CMRR test -0.1 VCC - 1 V -0.1V VCM VCC - 1V 80 126 2.4V VCC 5.5V 80 112 VOS CMRR PSRR AVOL VOH Output Voltage Swing Low VOL MAX4465/MAX4467/MAX4469, f = 3.4kHz 75 MAX4466/MAX4468, f = 3.4kHz 80 RL = 100k to VCC/2, 0.05V VOUT VCC - 0.05V 110 125 RL = 10k to VCC/2, 0.1V VOUT VCC - 0.1V 80 95 IVCC - VOHI RL = 100k 10 RL = 10k 20 RL = 100k 10 RL = 10k 20 To either supply rail 15 Output Leakage Current in Shutdown SHDN = VCC, 0 VOUT VCC (Notes 2, 3) 1 SHDN Logic Low VIL (Note 2) SHDN Logic High VIH (Note 2) dB dB dB Output Short-Circuit Current Phase Margin UNITS 5.5 10 Output Voltage Swing High Gain Bandwidth Product MAX SHDN = VCC (Note 2) SHDN Input Current 2 CONDITIONS Inferred from PSRR test 50 50 OM mV mA 100 VCC 0.3 VCC 0.7 nA V V (Note 2) GBWP mV 1 MAX4465/MAX4467/MAX4469 200 MAX4466/MAX4468 500 RL = 100k 70 _______________________________________________________________________________________ A kHz Degrees Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown (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 SYMBOL CONDITIONS Gain Margin MIN TYP RL = 100k Slew Rate SR Input Noise Voltage Density Output step = 4V en Total Harmonic Distortion Capacitive Load Stability UNITS 45 MAX4466/MAX4468, AV = +5 300 dB mV/s 80 f = 1kHz, RL = 10k, VOUT = 2Vp-p CLOAD SHDN Delay Time MAX4465/MAX4467/ MAX4469, AV = +1 f = 1kHz THD MAX 20 MAX4465/MAX4467/ MAX4469 0.02 MAX4466/MAX4468 0.03 MAX4465/MAX4467/MAX4469, AV = +1 100 MAX4466/MAX4468, AV = +5 100 nV/Hz % pF t SHDN (Note 2) 1 s Enable Delay Time tEN (Note 2) 50 s Power-On Time tON (Note 2) 40 Bias Switch On-Resistance RS IS = 5mA (Note 2) 25 s 40 Note 1: All specifications are 100% 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.) 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M MAX4465/MAX4467/MAX4469 GAIN AND PHASE vs. FREQUENCY (CL = 100pF) 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 MAX4465-69 toc03 MAX4465-69 toc02 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 GAIN (dB)/PHASE (DEGREES) MAX4466/MAX4468 GAIN AND PHASE vs. FREQUENCY (NO LOAD) GAIN (dB)/PHASE (DEGREES) 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 MAX4465-69 toc01 GAIN (dB)/PHASE (DEGREES) MAX4465/MAX4467/MAX4469 GAIN AND PHASE vs. FREQUENCY (NO LOAD) 0.1 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) _______________________________________________________________________________________ 3 MAX4465-MAX4469 ELECTRICAL CHARACTERISTICS (continued) 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 -70 -90 24 400 200 23 -200 21 -400 20 100 1k 10k 100k -15 10 35 60 85 -40 -15 10 35 60 FREQUENCY (Hz) TEMPERATURE (C) TEMPERATURE (C) OUTPUT VOLTAGE SWING HIGH vs. TEMPERATURE OUTPUT VOLTAGE SWING LOW vs. TEMPERATURE COMMON-MODE REJECTION RATIO vs. TEMPERATURE 4 3 2 -102 -104 -106 CMRR (dB) VOUT - VSS (mV) 4 -100 85 MAX4465-69 toc09 5 MAX4465-69 toc07 5 VDD - VOUT (mV) -600 -40 1M MAX4465-69 toc08 10 0 22 -110 -130 MAX4465-69 toc06 MAX4465-69 toc05 600 VOS (V) PSRR (dB) -50 25 SUPPLY CURRENT (A) -30 INPUT OFFSET VOLTAGE vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE MAX4465-69 toc04 -10 3 2 -108 -110 -112 -114 1 1 0 0 -116 -118 -15 10 35 60 85 -120 -40 -15 10 35 60 -40 85 -15 10 35 60 TEMPERATURE (C) TEMPERATURE (C) TEMPERATURE (C) LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE LARGE-SIGNAL GAIN vs. TEMPERATURE MINIMUM OPERATING VOLTAGE vs. TEMPERATURE 125 120 125 115 1.6 85 MAX4465-69 toc12 130 MAX4465-69 toc10 130 MAX4465-69 toc11 -40 1.5 105 100 VMIN (V) 1.4 110 GAIN (dB) GAIN (dB) MAX4465-MAX4469 Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown 120 1.3 1.2 95 115 90 1.1 85 80 VOUT (V) 4 1.0 110 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40 -15 10 35 TEMPERATURE (C) 60 85 -40 -15 10 35 TEMPERATURE (C) _______________________________________________________________________________________ 60 85 Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown (VCC = +5V, VCM = 0, VOUT = VCC/2, RL= 100k to VCC/2, SHDN = GND (MAX4467/MAX4468 only). TA = +25C, unless otherwise noted.) 1 RL = 10k 0.1 MAX4465-69 toc14 100 RL = 10k 1 0.1 f = 1kHz AV = +1V/V BW = 122kHz 10 THD + N (%) THD + N (%) VOUT = 2Vp-p AV = +10V/V BW = 22kHz 10 THD + N (%) VOUT = 2Vp-p AV = +1V/V BW = 22kHz 10 100 MAX4465-69 toc13 100 MAX4465/MAX4467/MAX4469 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT AMPLITUDE MAX4466/MAX4468 TOTAL HARMONIC DISTORTION vs. FREQUENCY MAX4465-69 toc15 MAX4465/MAX4467/MAX4469 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 1 RL = 10k 0.1 RL = 100k 0.01 0.01 0.001 0.001 20 2k 20k RL = 100k 0.001 20 200 2k 0 20k FREQUENCY (Hz) FREQUENCY (Hz) MAX4466/MAX4468 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT AMPLITUDE NONINVERTING SMALL-SIGNAL TRANSIENT RESPONSE 0.5 1.0 1.5 2.0 3.0 NONINVERTING LARGE-SIGNAL TRANSIENT RESPONSE MAX4465-69 toc18 MAX4465-69 toc16 f = 1kHz AV = +10V/V BW = 22kHz 10 2.5 VIN (Vp-p) MAX4465-69 toc17 100 THD + N (%) 200 0.01 RL = 100k 1 0.01 2V/ div 50mV/ div RL = 10k 0.1 RL = 100k 0.001 0.15 0.20 VIN (Vp-p) 0.25 0.30 20s/div 200s/div SUPPLY CURRENT vs. SUPPLY VOLTAGE eNOISE vs. FREQUENCY 40 20 AVCL = +1V/V 190 eNOISE (nVHz) 30 220 MAX4465-69 toc20 0.10 MAX4465-69 toc19 0.05 SUPPLY CURRENT (A) 0 160 130 100 10 70 0 40 0 1 2 3 SUPPLY VOLTAGE (V) 4 5 100 1k 10k 100k 1M FREQUENCY (Hz) _______________________________________________________________________________________ 5 MAX4465-MAX4469 Typical Operating Characteristics (continued) 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.) SINK CURRENT vs. OUTPUT VOLTAGE SOURCE CURRENT vs. OUTPUT VOLTAGE 20 SOURCE CURRENT (mA) 20 VCC = +5V 15 10 VCC = +2.4V 5 MAX4465-69 toc22 25 MAX4465-69 toc21 25 SINK CURRENT (mA) MAX4465-MAX4469 Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown 15 VCC = +5V 10 VCC = +2.4V 5 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 0 OUTPUT VOLTAGE (V) 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V) Pin Description PIN NAME FUNCTION MAX4465 MAX4466 MAX4467 MAX4468 MAX4469 4 6 (8) -- OUT -- -- 1 OUTA -- 1 (4) -- MIC_BIAS 3 2 (3) -- IN- Inverting Amplifier Input 1 3 (2) -- IN+ Noninverting Amplifier Input 2 4 (1) 4 GND Ground Amplifier Output Amplifier Output A External Microphone Bias Network Switch Output 5 7 (7) 8 VCC Positive Supply. Connect a 0.1F capacitor to GND. -- -- 2 INA- Inverting Amplifier Input A -- -- 3 INA+ Noninverting Amplifier Input A -- -- 6 INB- Inverting Amplifier Input B -- -- 5 INB+ Noninverting Amplifier Input B -- -- 7 OUTB Amplifier Output B -- 8 (6) -- SHDN Active-Low Shutdown Input. Connect to GND for normal operation. Connect to VCC for shutdown. Do not leave floating. -- 5 (5) -- N.C. No Connection. Not internally connected. ( ) denotes SOT23 package of the MAX4467/MAX4468. 6 _______________________________________________________________________________________ Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown 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 20A of supply current. The MAX4466/MAX4468 have a minimum stable gain of +5V/V while providing a 500kHz 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. Rail-to-Rail Output Stage The MAX4465-MAX4469 can drive a 10k load and still typically swing within 20mV of the supply rails. Figure 1 shows the output voltage swing of the MAX4465 configured with AV = +10. 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 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 lowpower applications. The MIC_BIAS pin provides a switched version of VCC to the bias components. Figure 3 shows some typical values. the amplifier. Do not leave SHDN floating. Figure 5 shows the shutdown waveform. 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 common mode. The ratio of these voltages is called the common-mode gain. The common-mode rejection ratio is the logarithm of differential-mode gain to commonmode gain. The high CMRR properties of the MAX4465-MAX4469 provide outstanding performances when configured as a noninverting microphone preamplifier. Power-Up The MAX4465-MAX4469 outputs typically settle within 1s after power-up. Figure 6 shows the output voltage on power-up. Power Supplies and Layout The MAX4465-MAX4469 operate from a single +2.4V to +5.5V power supply. Bypass the power supply with a 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. 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 10nA, the output enters a high-impedance state and the bias current to the microphone is switched off. Pull SHDN low to enable _______________________________________________________________________________________ 7 MAX4465-MAX4469 Detailed Description MAX4465-MAX4469 Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown Test Circuits/Timing Diagrams 1V/div 100s/div Figure 1. Rail-to-Rail Output Operation +5V +5V 2k VCC = +5V 5 0.1F 2k MAX4466 1M IN+ 1 0.01F 4 1M OUT IN- 3 ELECTRET CAPSULE 10k 2 1F GND 100k 100pF Figure 2. MAX4466 Typical Application Circuit 8 _______________________________________________________________________________________ Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown VCC SHDN MIC_BIAS 1k 100k IN+ 10F OUT 2.2k 100k 0.01F IN- MAX4468 MICROPHONE INPUT GND 0.1F 3.5mm SOCKET 200k 20k 47pF Figure 3. Bias Network Circuit RL = 10k CL = 10pF CL = 2000pF SHDN 2V/div 50mV/div OUT 40s/div Figure 4. Small-Signal Transient Response with Excessive Capacitive Load 400s/div Figure 5. MAX4467/MAX4468 Shutdown Waveform _______________________________________________________________________________________ 9 MAX4465-MAX4469 Test Circuits/Timing Diagrams (continued) 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) OUT 1V/div 20s/div Figure 6. Power-Up/Power-Down Waveform PART TEMP. RANGE PIN-PACKAGE MAX4467EKA-T* -40C to +85C 8 SOT23-8 8 SO MAX4467ESA-T* -40C to +85C MAX4468EKA-T* -40C to +85C 8 SOT23-8 MAX4468ESA-T* -40C to +85C 8 SO MAX4469EKA-T* -40C to +85C 8 SOT23-8 MAX4469ESA-T* -40C to +85C 8 SO *Future product--contact factory for availability. Selector Guide PART MINIMUM STABLE GAIN EXTERNAL MICROPHONE SHDN GBWP (kHz) PIN-PACKAGE MAX4465 +1 No 200 5-SC70/5-SOT23 MAX4466 +5 No 500 5-SC70/5-SOT23 MAX4467 +1 Yes 200 8-SOT23/8-SO MAX4468 +5 Yes 500 8-SOT23/8-SO MAX4469 +1 No 200 8-SOT23/8-SO Pin Configurations (continued) GND 1 IN+ 2 IN- 3 MIC_BIAS 4 MAX4467 MAX4468 SOT23 10 8 OUT MIC_BIAS 1 7 VCC IN- 2 6 SHDN 5 N.C. IN+ 3 MAX4467 MAX4468 GND 4 SO OUTA 1 8 SHDN 8 VCC 7 VCC INA- 2 7 OUTB 6 OUT 5 N.C. INA+ 3 6 INB- GND 4 5 INB+ MAX4469 SOT23/SO ______________________________________________________________________________________ Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown SC70, 5L.EPS ______________________________________________________________________________________ 11 MAX4465-MAX4469 Package Information Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown SOT5L.EPS MAX4465-MAX4469 Package Information (continued) 12 ______________________________________________________________________________________ Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown SOT23, 8L.EPS ______________________________________________________________________________________ 13 MAX4465-MAX4469 Package Information (continued) Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown SOICN.EPS MAX4465-MAX4469 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. 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.