MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias

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1 General Description The MAX982/MAX983 are single/dual-input, 20dB fixed-gain microphone amplifiers. They offer tiny packaging and a low-noise, integrated microphone bias, making them ideal for portable audio applications such as notebook computers, cell phones, and PDAs. These amplifiers feature a 500kHz bandwidth, rail-to-rail outputs, an industry-leading 00dB power-supply rejection ratio, and a very low 0.05% THD+N. Power-saving features include very low 230µA supply current and a total shutdown mode that cuts the combined supply and currents to only 00nA. The MAX982 is a single amplifier in a 6-pin SC70 package (2mm x 2.mm) and the MAX983 is a dualinput amplifier available in an 8-pin SOT23 (3mm x 3mm) package. The MAX983 has two inputs allowing two microphones to be multiplexed to a single output. The MAX982/MAX983 are offered in two grades. The MAX982L/MAX983L are optimized for 3.3V supply operation (2.7V to 3.6V). The MAX982H/MAX983H are PC200 compliant and are optimized for 5V operation (4.5V to 5.5V). Both devices are specified over the -40 C to +85 C extended operating temperature range. Notebook Computers PDAs Smart Phones Car Kit Adapters Digital Cameras Video Tape Recorders Applications Features PC200 Compliant 00dB at 27Hz Power-Supply Rejection Ratio Very Low 230µA Quiescent Current Low 0.05% THD+N Available in Two Versions MAX982L/MAX983L 2.7V to 3.6V MAX982H/MAX983H 4.5V to 5.5V Internal Low-Noise Microphone Bias Supply 2.3V for MAX982L/MAX983L 4.0V for MAX982H/MAX983H 00nA Low-Power Shutdown Mode Rail-to-Rail Outputs 20dB Fixed Gain Available in Tiny 6-Pin SC70 (2mm x 2.mm) and 8-Pin SOT23 (3mm x 3mm) Packages Extended Temperature Range -40 C to +85 C PART Ordering Information TEMP RANGE PIN- PA CK A G E (V) MAX982LEXT+T -40 C to +85 C 6 SC to 3.6 MAX982LEXT/V+T -40 C to +85 C 6 SC to 3.6 MAX982HEXT+T -40 C to +85 C 6 SC to 5.5 MAX983LEKA+T -40 C to +85 C 8 SOT to 3.6 MAX983HEKA+T -40 C to +85 C 8 SOT to 5.5 +Denotes a lead(pb)-free/rohs-compliant package. /V denotes an automotive qualified part. Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet. Simplified Block Diagrams REFERENCE 2.3V (L VERSION) 4.0V (H VERSION) REFERENCE 2.3V (L VERSION) 4.0V (H VERSION) IN 20dB IN IN2 20dB IN/IN2 MAX982 MAX983 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at ; Rev 2; 9/2

2 ABSOLUTE MAXIMUM RATINGS (All voltages referenced to.) v to +6.0V All Other Pins V to ( + 0.3V) Continuous Current (IN,, IN, IN2, IN/IN2)...±20mA, Short-Circuit Duration (to or )...Continuous Continuous Power Dissipation (T A = +70 C) SC70 (derate 3.mW/ C above +70 C)...245mW SOT23 (derate 8.9mw/ C above +70 C)...74mW Operating Temperature Range C to +85 C Storage Temperature Range C to +50 C Junction Temperature C Lead Temperature (soldering, 0s) C Soldering Temperature (reflow) 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. ELECTRICAL CHARACTERISTICS ( = 3.3V, I = 500µA (MAX982L/MAX983L), = 5V, I = 800µA (MAX982H/MAX983H), V = 0V, R L = open, =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note ) GENERAL PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX982L/MAX983L Inferred from Supply Voltage Range MAX982H/MAX983H PSRR test Supply Current I CC I = 0A µa Shutdown Supply Current I CC_ = 0. µa MAX982L/MAX983L Amplifier Output Bias Voltage V _DC MAX982H/MAX983H Input Resistance R IN 85 kω Voltage Gain A V db Power-Supply Rejection Ratio PSRR Input referred, T A = +25 C Output Voltage Swing V OH R L = 0kΩ to /2 R L = kω to /2 DC f = 27Hz 00 f = khz 00 f = 0kHz V V R L = 0kΩ to /2 0. V OL R L = kω to / Output Short-Circuit Current I _SC Sinking or sourcing ma Small-Signal -3dB Bandwidth BW V = 0mV P-P 400 khz Output Capacitive-Load Stability C L No sustained oscillations 50 pf Output Impedance Z f = khz 0.5 Ω Output Slew Rate SR V = V step V/µs V V db V 2 Maxim Integrated

3 ELECTRICAL CHARACTERISTICS (continued) ( = 3.3V, I = 500µA (MAX982L/MAX983L), = 5V, I = 800µA (MAX982H/MAX983H), V = 0V, R L = open, =, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Amplifier Input Voltage-Noise Density e n Inputs at AC f = khz 40 nv/ Hz Total Integrated Input Noise V n 22Hz to 22kHz BW, inputs at AC 5 µv RMS Off-Isolation Input referred, MAX983 khz 75 only 0kHz 60 db Total Harmonic Distortion Plus Noise THD+N f = khz, R L = 0kΩ to /2, BW = 22Hz to 22kHz V = V P-P (L version) V = 4V P-P (H version) MAX982L/MAX983L Bias Output Voltage Range V MAX982H/MAX983H % V Bias Output Resistance R 0. Ω Power-Supply Rejection Ratio ( to ) PSRR DC, T A = +25 C f = 27Hz 80 f = khz 75 f = 0kHz 55 Current Limit I _SC short to ma Capacitive-Load Stability C No sustained oscillations 50 pf Total Integrated Noise V n 22Hz to 22kHz BW 29 µv RMS DIGITAL INPUTS (, IN/IN2) Logic-Low Threshold V IL 0.8 V Logic-High Threshold V IH 2.0 V Logic Input Current I IN = or ± µa Shutdown Enable Time t _ON 95% of settled value 0 ms db Shutdown Disable Time t _OFF 50 µs IN/IN2 Select Time t SEL 0 µs Note : All specifications are 00% tested at T A = +25 C. Temperature limits are guaranteed by design. Maxim Integrated 3

4 Typical Operating Characteristics ( = 3.3V (MAX982L/MAX983L), = 5V (MAX982H/MAX983H), V = 0V, R L = 0kΩ to /2, =, T A = +25 C, unless otherwise noted.) PUT VOLTAGE GAIN (db) R L = OPEN V = 0mV P-P GAIN vs. FREQUENCY 0 00 k 0k 00k M 0M MAX982 toc0 PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 0-0 V RIPPLE = 200mV P-P -20 INPUT REFERRED k 0k 00k MAX982 toc02 PSRR (VCC TO ) (db) POWER-SUPPLY REJECTION RATIO ( TO ) vs. FREQUENCY 0 V RIPPLE = 200mV P-P k 0k 00k MAX982 toc03 SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE MAX982H MAX982L TEMPERATURE ( C) MAX982 toc04 SUPPLY CURRENT (µa) MAX982L SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX982H SUPPLY VOLTAGE (V) MAX982 toc05 SHUTDOWN SUPPLY CURRENT (µa) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE ( C) MAX982 toc V vs. TEMPERATURE MAX982 toc V vs. I MAX982 toc V (L VERSION) (V) MAX982H MAX982L V (H VERSION) (V) V (L VERSION) (V) MAX982H MAX982L V (H VERSION) (V) TEMPERATURE ( C) I (ma) 4 Maxim Integrated

5 Typical Operating Characteristics (continued) ( = 3.3V (MAX982L/MAX983L), = 5V (MAX982H/MAX983H), V = 0V, R L = 0kΩ to /2, =, T A = +25 C, unless otherwise noted.) THD+N (%) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY BW = 22Hz TO 22kHz 0. V = V RMS R L = 2kΩ MAX982 toc09 THD+N (%) TOTAL HARMONIC DISTORTION PLUS NOISE vs. PUT AMPLITUDE 0 H VERSION BW = 22Hz TO 22kHz 0. f = 0kHz MAX982 toc0 THD+N (%) 0.0 TOTAL HARMONIC DISTORTION PLUS NOISE vs. PUT AMPLITUDE 00 L VERSION BW = 22Hz TO 22kHz 0 f = khz f = 00Hz V = V RMS R L = 0kΩ k 0k 00k f = 0kHz MAX982 toc INPUT-REFERRED NOISE (nv/ Hz) 0.0 f = 00Hz f = khz PUT AMPLITUDE (V RMS ) INPUT-REFERRED NOISE vs. FREQUENCY 00 INPUTS AT AC MAX982 toc PUT AMPLITUDE (V RMS ) k 0k 00k NOISE vs. FREQUENCY 0,000 NOISE (nv/ Hz) k 0k 00k MAX982 toc3 CROSSTALK (db) OFF-ISOLATION vs. FREQUENCY MAX983 V IN = 00mV RMS IN TO WITH IN2 SELECTED k 0k 00k MAX982 toc4 Maxim Integrated 5

6 Typical Operating Characteristics (continued) ( = 3.3V (MAX982L/MAX983L), = 5V (MAX982H/MAX983H), V = 0V, R L = 0kΩ to /2, =, T A = +25 C, unless otherwise noted.) SMALL-SIGNAL PULSE RESPONSE (R L = OPEN, C L = 0pF) MAX982 toc5 LARGE-SIGNAL PULSE RESPONSE (R L = OPEN, C L = 0pF) MAX982 toc6 IN 5mV/div IN 00mV/div 50mV/div V/div 0V µs/div 2µs/div -OF-SHUTDOWN WAVEFORM INPUT UNCONNECTED MAX982 toc7 MAX983 SWITCHING BETWEEN TWO INPUTS MAX982 toc8 IN2 = 200mV P-P AT 20kHz IN = 00mV P-P AT 0kHz 2V/div V/div 2V/div 2V/div 2V/div IN/IN2 ms/div 00µs/div PUT OVERDRIVEN MAX982 toc9 V/div IN 500mV/div 2µs/div 6 Maxim Integrated

7 Pin Description MAX982L/ MAX982H PIN MAX983L/ MAX983H NAME FUNCTION 3 Active-Low Shutdown Input. Connect to for normal operation. Connect to for shutdown. is a high-impedance input; do not leave unconnected. 2 2 Ground 3 Amplifier Output 4 8 Positive Supply. Bypass to with a capacitor. 5 7 Low-Noise Microphone Bias Output. 2.3V output for MAX982L/MAX983L. 4V output for MAX982H/MAX983H. 6 IN Amplifier Input (MAX982) 6 IN Amplifer Input (MAX983) 5 IN2 Amplifier Input 2 (MAX983) 4 IN/IN2 Input Selector. When IN/IN2 is high, IN is selected. When IN/IN2 low, IN2 is selected. Detailed Description The MAX982_/MAX983_ are low-power fixed-gain microphone amplifiers available in a single- or dualinput configuration. The gain is set at 0V/V (20dB) with a 400kHz, -3dB bandwidth. They also feature a lownoise, integrated microphone input bias voltage. Single/Dual Input The MAX982L/MAX982H are single-input amplifiers and the MAX983L/MAX983H are dual-input amplifiers. All devices typically have an input impedance of 85kΩ. The inputs to the dual version are controlled through a fast 2: mux, selectable through the IN/IN2 pin. Driving IN/IN2 high selects IN and driving the IN/IN2 low selects IN2. IN/IN2 is designed to be driven by a logic high of 2V and a logic low 0.8V. The IN/IN2 has a 0µs switching time from one channel to the other. PC200 Low-Noise Microphone The MAX982_/MAX983_ provide a low-noise voltage designed for biasing electret condenser microphone (ECM) cartridges. The output is regulated to typically 2.3V for the MAX982L/MAX983L and 4V for the MAX982H/MAX983H. In the single-input version (MAX982_), the output can source up to ma. In the dual-input version (MAX983_), the output can source up to 2mA. The MAX982H/ MAX983H provides a PC200-compliant voltage. Output Stage The MAX982_/MAX983_ rail-to-rail output () typically swings to within 00mV of the rails when driving 0kΩ. The output DC bias point is set to.5v for the MAX982L/ MAX983L and 2.5V for the MAX982H/MAX983H. Shutdown Mode controls whether the MAX982_/MAX983_ is active or in shutdown mode. Driving low forces a low-power (00nA) shutdown mode. In this mode, the pin is set to a high-impedance state and the pin is pulled down (70kΩ). Driving high enables the MAX982_/MAX983_. is a high-impedance input and cannot be left unconnected. Driving Capacitive Loads The MAX982_/MAX983_ output can drive up to 50pF of capacitance without sustained oscillations. Thermal Shutdown The thermal shutdown feature protects the MAX982_/MAX983_ from destruction due to overheating caused by shorting the outputs. This protection feature causes and to shut down and go high impedance when the die temperature reaches +40 C. The device restarts after the die temperature falls below +20 C. Applications Information Power-Up The MAX982_/MAX983_ output typically settles to 95% within 0ms after power-up. Typical Application Circuit Figure shows the MAX983H used as a preamplifier with the MAX9760 3W audio power amplifier. Maxim Integrated 7

8 V DD V DD PV DD 0.047µF 27.4kΩ V DD 220kΩ 22kΩ 2.2kΩ IN/IN2 IN MAX983 IN2 CODEC µf 0.68µF 0.68µF HPF 0.68µF 5kΩ 5kΩ 5kΩ SV DD GAINLB GAINLA L+ INL L- INL2 MAX9760 INR 33.2kΩ 5kΩ 220µF 0kΩ 2.2kΩ 0.68µF HPF 5kΩ INR2 R- kω MICROCONTROLLER V DD kω 0kΩ SCL SDA ADD R+ GAINRA GAINRB HPS 5kΩ 33.2kΩ 27.4kΩ 0.047µF 47kΩ 220µF 0kΩ V DD 680kΩ INT Figure. Typical Application Circuit 8 Maxim Integrated

9 Typical Operating Circuits V 5 4 V kΩ MIC 6 IN MAX kΩ MIC 2.2kΩ 6 5 IN IN2 MAX MIC2 4 IN/IN2 2 Pin Configurations TOP VIEW + 6 IN MAX MAX IN 3 4 IN/IN2 4 5 IN2 SC70 SOT23 Selector Guide PART PIN-PACKAGE (V) TOP MARK MAX982LEXT+T 6 SC to 3.6 ABJ MAX982HEXT+T 6 SC to 5.5 ABK MAX983LEKA+T 8 SOT to 3.6 AEEU MAX983HEKA+T 8 SOT to 5.5 AEEV +Denotes a lead(pb)-free/rohs-compliant package. Package Information For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE LINE NO. LAND PATTERN NO. 6 SC70 X6SN SOT K PROCESS: BiCMOS Chip Information Maxim Integrated 9

10 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 4/03 Initial release 8/2 Added lead-free description, 9 2 9/2 Added automotive qualified part 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 0 Maxim Integrated 60 Rio Robles, San Jose, CA 9534 USA Maxim Integrated Products, Inc. The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.