MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias General Description The MAX9812/MAX9813 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 100dB power-supply rejection ratio, and a very low 0.015% THD+N. Power-saving features include very low 230µA supply current and a total shutdown mode that cuts the combined supply and BIAS currents to only 100nA. The MAX9812 is a single amplifier in a 6-pin SC70 package (2mm x 2.1mm) and the MAX9813 is a dualinput amplifier available in an 8-pin SOT23 (3mm x 3mm) package. The MAX9813 has two inputs allowing two microphones to be multiplexed to a single output. The MAX9812/MAX9813 are offered in two grades. The MAX9812L/MAX9813L are optimized for 3.3V supply operation (2.7V to 3.6V). The MAX9812H/MAX9813H are PC2001 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. Features o o o o o o o o o o o PC2001 Compliant 100dB at 217Hz Power-Supply Rejection Ratio Very Low 230µA Quiescent Current Low 0.015% THD+N Available in Two Versions MAX9812L/MAX9813L—2.7V to 3.6V MAX9812H/MAX9813H—4.5V to 5.5V Internal Low-Noise Microphone Bias Supply 2.3V for MAX9812L/MAX9813L 4.0V for MAX9812H/MAX9813H 100nA Low-Power Shutdown Mode Rail-to-Rail Outputs 20dB Fixed Gain Available in Tiny 6-Pin SC70 (2mm x 2.1mm) and 8-Pin SOT23 (3mm x 3mm) Packages Extended Temperature Range -40°C to +85°C Ordering Information TEMP RANGE PINPACKAGE MAX9812LEXT+T -40°C to +85°C 6 SC70 2.7 to 3.6 MAX9812LEXT/V+T -40°C to +85°C 6 SC70 2.7 to 3.6 Notebook Computers MAX9812HEXT+T -40°C to +85°C 6 SC70 4.5 to 5.5 PDAs MAX9813LEKA+T -40°C to +85°C 8 SOT23 2.7 to 3.6 Smart Phones MAX9813HEKA+T -40°C to +85°C 8 SOT23 +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. Applications Car Kit Adapters Digital Cameras PART VCC (V) 4.5 to 5.5 Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet. Video Tape Recorders Simplified Block Diagrams VCC VCC SHDN BIAS REFERENCE 2.3V (L VERSION) 4.0V (H VERSION) SHDN BIAS REFERENCE 2.3V (L VERSION) 4.0V (H VERSION) IN1 IN 20dB OUT 20dB OUT IN2 IN1/IN2 MAX9812 GND MAX9813 GND For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-2840; Rev 2; 9/12 MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC ........................................................................-0.3V to +6.0V All Other Pins..............................................-0.3V to (VCC + 0.3V) Continuous Current (IN, SHDN, IN1, IN2, IN1/IN2)...........±20mA OUT, BIAS Short-Circuit Duration (to GND or VCC) ...Continuous Continuous Power Dissipation (TA = +70°C) SC70 (derate 3.1mW/°C above +70°C) .......................245mW SOT23 (derate 8.9mw/°C above +70°C) .....................714mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°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 (VCC = 3.3V, IBIAS = 500µA (MAX9812L/MAX9813L), VCC = 5V, IBIAS = 800µA (MAX9812H/MAX9813H), VGND = 0V, RL = open, SHDN = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL Supply Voltage Range Supply Current VCC ICC Shutdown Supply Current ICC_SHDN Amplifier Output Bias Voltage VOUT_DC Input Resistance RIN Voltage Gain AV MAX9812L/MAX9813L MAX9812H/MAX9813H Inferred from PSRR test PSRROUT 3.6 4.5 5.5 230 400 µA SHDN = GND 0.1 1 µA MAX9812L/MAX9813L 1.35 1.5 1.65 MAX9812H/MAX9813H 2.25 2.5 2.75 85 Input referred, TA = +25°C 19 20 90 100 f = 217Hz 100 f = 1kHz 100 f = 10kHz 90 VOH RL = 1kΩ to VCC/2 VOL kΩ 21 dB dB VCC 0.25V VCC 0.1V V RL = 10kΩ to VCC/2 0.1 RL = 1kΩ to VCC/2 0.1 0.25 12 24 Output Short-Circuit Current IOUT_SC Small-Signal -3dB Bandwidth BW VOUT = 10mVP-P 400 kHz Output Capacitive-Load Stability CL No sustained oscillations 50 pF f = 1kHz 0.5 Ω 1 V/µs Output Impedance Output Slew Rate 2 ZOUT SR Sinking or sourcing V VCC 0.1 RL = 10kΩ to VCC/2 Output Voltage Swing V IBIAS = 0A DC Power-Supply Rejection Ratio 2.7 VOUT = 1V step 3 mA Maxim Integrated MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V, IBIAS = 500µA (MAX9812L/MAX9813L), VCC = 5V, IBIAS = 800µA (MAX9812H/MAX9813H), VGND = 0V, RL = open, SHDN = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS Amplifier Input Voltage-Noise Density en Inputs at AC GND Total Integrated Input Noise Vn 22Hz to 22kHz BW, inputs at AC GND Off-Isolation Input referred, MAX9813 only Total Harmonic Distortion Plus Noise f = 1kHz, RL = 10kΩ to VCC/2, BW = 22Hz to 22kHz THD+N MIN f = 1kHz TYP MAX UNITS 40 nV/√Hz 5 µVRMS 1kHz 75 10kHz 60 VOUT = 1VP-P (L version) 0.04 VOUT = 4VP-P (H version) 0.015 dB % BIAS Bias Output Voltage Range VBIAS Bias Output Resistance RBIAS Power-Supply Rejection Ratio (VCC to BIAS) PSRRBIAS MAX9812L/MAX9813L 2.1 2.30 2.55 MAX9812H/MAX9813H 3.6 4.0 4.4 DC, TA = +25°C 70 BIAS Capacitive-Load Stability Total Integrated BIAS Noise IBIAS_SC CBIAS Vn Ω 0.1 80 f = 217Hz 80 f = 1kHz 75 f = 10kHz BIAS Current Limit BIAS short to GND V dB 55 5 22 50 mA No sustained oscillations 50 pF 22Hz to 22kHz BW 29 µVRMS DIGITAL INPUTS (SHDN, IN1/IN2) Logic-Low Threshold VIL Logic-High Threshold VIH Logic Input Current IIN SHDN = GND or VCC Shutdown Enable Time tSHDN_ON 95% of settled value Shutdown Disable Time IN1/IN2 Select Time 0.8 2.0 V V ±1 µA 10 ms tSHDN_OFF 50 µs tSEL 10 µs Note 1: All specifications are 100% tested at TA = +25°C. Temperature limits are guaranteed by design. Maxim Integrated 3 MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias Typical Operating Characteristics (VCC = 3.3V (MAX9812L/MAX9813L), VCC = 5V (MAX9812H/MAX9813H), VGND = 0V, RL = 10kΩ to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) PSRR (dB) 20 10 0 -10 -20 100 1k 10k 100k 1M -50 -60 -70 -90 100 1k 10k 100 10 100k 1k 10k 100k FREQUENCY (Hz) SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. SUPPLY VOLTAGE SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 280 SUPPLY CURRENT (µA) 260 225 220 215 MAX9812L 220 200 160 140 205 120 200 100 5 20 35 50 65 MAX9812H 180 210 0.12 0.11 0.10 0.09 0.08 0.07 0.05 -40 -25 -10 SUPPLY VOLTAGE (V) TEMPERATURE (°C) MAX9812 toc07 5 20 35 50 65 80 TEMPERATURE (°C) VBIAS vs. TEMPERATURE 2.33 VBIAS vs. IBIAS 2.3002 4.03 MAX9812 toc08 4.0002 4.02 2.32 4.00 2.30 3.99 MAX9812L 2.29 3.98 VBIAS (L VERSION) (V) 2.3001 4.01 MAX9812H VBIAS (H VERSION) (V) 2.31 0.13 0.06 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 6.0 80 0.14 4.0001 MAX9812L 2.3000 4.0000 2.2999 MAX9812H 3.9999 VBIAS (H VERSION) (V) -40 -25 -10 MAX9812L 240 0.15 MAX9812 toc06 MAX9812 toc04 300 230 MAX9812 toc03 -40 -100 10 MAX9812H VBIAS (L VERSION) (V) -30 FREQUENCY (Hz) 240 SUPPLY CURRENT (µA) -20 -80 10M 245 2.2998 2.28 3.97 3.96 2.27 -40 -25 -10 5 20 35 50 TEMPERATURE (°C) 4 VRIPPLE = 200mVP-P FREQUENCY (Hz) 250 235 0 -10 SHUTDOWN SUPPLY CURRENT (µA) 10 VRIPPLE = 200mVP-P INPUT REFERRED MAX9812 toc05 30 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 PSRR (VCC TO BIAS) (dB) RL = OPEN VOUT = 10mVP-P MAX9812 toc02 MAX9812 toc01 OUTPUT VOLTAGE GAIN (dB) 40 POWER-SUPPLY REJECTION RATIO (VCC TO BIAS) vs. FREQUENCY POWER-SUPPLY REJECTION RATIO vs. FREQUENCY GAIN vs. FREQUENCY 65 80 2.2997 0 3.9998 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 IBIAS (mA) Maxim Integrated MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias Typical Operating Characteristics (continued) (VCC = 3.3V (MAX9812L/MAX9813L), VCC = 5V (MAX9812H/MAX9813H), VGND = 0V, RL = 10kΩ to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY H VERSION BW = 22Hz TO 22kHz 1 THD+N (%) VOUT = 1VRMS RL = 2kΩ THD+N (%) MAX9812 toc10 BW = 22Hz TO 22kHz 0.1 10 MAX9812 toc09 1 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE f = 10kHz 0.1 0.01 0.01 VOUT = 1VRMS RL = 10kΩ f = 100Hz f = 1kHz 0.001 0.001 100 1k 10k 100k 0 FREQUENCY (Hz) OUTPUT AMPLITUDE (VRMS) L VERSION BW = 22Hz TO 22kHz f = 10kHz 1 0.1 0.01 f = 100Hz INPUTS AT AC GND 0.001 70 50 30 10 0 0.5 1.0 10 1.5 100k OFF-ISOLATION vs. FREQUENCY MAX9812 toc13 10 MAX9813 VIN1 = 100mVRMS 0 -10 -20 CROSSTALK (dB) BIAS NOISE (nV/√Hz) 10k FREQUENCY (Hz) BIAS NOISE vs. FREQUENCY 10,000 1k 100 OUTPUT AMPLITUDE (VRMS) MAX9812 toc14 THD+N (%) f = 1kHz INPUT-REFERRED NOISE vs. FREQUENCY 100 INPUT-REFERRED NOISE (nV/√Hz) 100 MAX9812 toc11 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE 10 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 MAX9812 toc12 10 1000 100 -30 -40 IN1 TO OUT WITH IN2 SELECTED -50 -60 -70 -80 -90 -100 10 10 100 1k FREQUENCY (Hz) Maxim Integrated 10k 100k 10 100 1k 10k 100k FREQUENCY (Hz) 5 MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias Typical Operating Characteristics (continued) (VCC = 3.3V (MAX9812L/MAX9813L), VCC = 5V (MAX9812H/MAX9813H), VGND = 0V, RL = 10kΩ to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) SMALL-SIGNAL PULSE RESPONSE (RL = OPEN, CL = 10pF) LARGE-SIGNAL PULSE RESPONSE (RL = OPEN, CL = 10pF) MAX9812 toc15 MAX9812 toc16 IN 5mV/div IN 100mV/div OUT 50mV/div OUT 1V/div 0V 1µs/div 2µs/div OUT-OF-SHUTDOWN WAVEFORM INPUT UNCONNECTED MAX9813 SWITCHING BETWEEN TWO INPUTS MAX9812 toc18 MAX9812 toc17 IN2 = 200mVP-P AT 20kHz IN1 = 100mVP-P AT 10kHz SHDN 2V/div 1V/div OUT 2V/div IN1/IN2 BIAS 2V/div OUT 2V/div 100µs/div 1ms/div OUTPUT OVERDRIVEN MAX9812 toc19 OUT 1V/div IN 500mV/div 2µs/div 6 Maxim Integrated MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias Pin Description PIN MAX9812L/ MAX9812H MAX9813L/ MAX9813H NAME FUNCTION 1 3 SHDN Active-Low Shutdown Input. Connect SHDN to VCC for normal operation. Connect SHDN to GND for shutdown. SHDN is a high-impedance input; do not leave unconnected. 2 2 GND Ground 3 1 OUT Amplifier Output 4 8 VCC Positive Supply. Bypass VCC to GND with a 0.1µF capacitor. 5 7 BIAS Low-Noise Microphone Bias Output. 2.3V output for MAX9812L/MAX9813L. 4V output for MAX9812H/MAX9813H. 6 — IN Amplifier Input (MAX9812) — 6 IN1 Amplifer Input 1 (MAX9813) — 5 IN2 Amplifier Input 2 (MAX9813) — 4 IN1/IN2 Input Selector. When IN1/IN2 is high, IN1 is selected. When IN1/IN2 low, IN2 is selected. Detailed Description The MAX9812_/MAX9813_ are low-power fixed-gain microphone amplifiers available in a single- or dualinput configuration. The gain is set at 10V/V (20dB) with a 400kHz, -3dB bandwidth. They also feature a lownoise, integrated microphone input bias voltage. Single/Dual Input The MAX9812L/MAX9812H are single-input amplifiers and the MAX9813L/MAX9813H are dual-input amplifiers. All devices typically have an input impedance of 85kΩ. The inputs to the dual version are controlled through a fast 2:1 mux, selectable through the IN1/IN2 pin. Driving IN1/IN2 high selects IN1 and driving the IN1/IN2 low selects IN2. IN1/IN2 is designed to be driven by a logic high of ≥2V and a logic low ≤0.8V. The IN1/IN2 has a 10µs switching time from one channel to the other. PC2001 Low-Noise Microphone BIAS The MAX9812_/MAX9813_ provide a low-noise voltage BIAS designed for biasing electret condenser microphone (ECM) cartridges. The BIAS output is regulated to typically 2.3V for the MAX9812L/MAX9813L and 4V for the MAX9812H/MAX9813H. In the single-input version (MAX9812_), the BIAS output can source up to 1mA. In the dual-input version (MAX9813_), the BIAS output can source up to 2mA. The MAX9812H/ MAX9813H provides a PC2001-compliant BIAS voltage. Output Stage The MAX9812_/MAX9813_ rail-to-rail output (OUT) typically swings to within 100mV of the rails when driving 10kΩ. Maxim Integrated The output DC bias point is set to 1.5V for the MAX9812L/ MAX9813L and 2.5V for the MAX9812H/MAX9813H. Shutdown Mode SHDN controls whether the MAX9812_/MAX9813_ is active or in shutdown mode. Driving SHDN low forces a low-power (100nA) shutdown mode. In this mode, the OUT pin is set to a high-impedance state and the BIAS pin is pulled down (70kΩ). Driving SHDN high enables the MAX9812_/MAX9813_. SHDN is a high-impedance input and cannot be left unconnected. Driving Capacitive Loads The MAX9812_/MAX9813_ output can drive up to 50pF of capacitance without sustained oscillations. Thermal Shutdown The thermal shutdown feature protects the MAX9812_/MAX9813_ from destruction due to overheating caused by shorting the outputs. This protection feature causes OUT and BIAS to shut down and go high impedance when the die temperature reaches +140°C. The device restarts after the die temperature falls below +120°C. Applications Information Power-Up The MAX9812_/MAX9813_ output typically settles to 95% within 10ms after power-up. Typical Application Circuit Figure 1 shows the MAX9813H used as a preamplifier with the MAX9760 3W audio power amplifier. 7 MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias VDD 0.1µF VDD BIAS PVDD 0.047µF 27.4kΩ SVDD 1µF VDD 33.2kΩ GAINLB 15kΩ 0.1µF 220µF 10kΩ GAINLA 220kΩ 15kΩ 0.1µF IN1/IN2 VCC OUT 0.1µF 0.68µF IN1 0.68µF MAX9813 OUTL- 15kΩ INL2 HPF 22kΩ OUTL+ INL1 CODEC IN2 0.68µF MAX9760 15kΩ 2.2kΩ INR1 BIAS GND SHDN 0.68µF OUTR15kΩ INR2 HPF 2.2kΩ OUTR+ VDD 0.1µF 15kΩ 220µF VDD GAINRA 33.2kΩ 1kΩ 1kΩ 10kΩ GAINRB 27.4kΩ 10kΩ 680kΩ SCL 0.047µF SDA MICROCONTROLLER ADD 47kΩ HPS INT SHDN Figure 1. Typical Application Circuit 8 Maxim Integrated MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias Typical Operating Circuits VCC VCC 8 4 VBIAS 5 BIAS 1 SHDN 2.2kΩ 0.1µF 6 VBIAS 0.1µF VCC BIAS SHDN 0.1µF 6 IN1 3 OUT 0.1µF VCC 2.2kΩ 0.1µF MAX9812 IN 2.2kΩ 7 3 0.1µF MAX9813 OUT 1 MIC1 0.1µF 5 MIC 4 MIC2 GND IN2 IN1/IN2 GND 2 2 Pin Configurations TOP VIEW + SHDN 1 GND 2 MAX9812 + 6 IN 5 BIAS OUT 1 8 VCC GND 2 7 BIAS 3 6 IN1 IN1/IN2 4 5 IN2 MAX9813 SHDN OUT 3 4 VCC SC70 SOT23 Package Information Selector Guide PART PIN-PACKAGE VCC (V) TOP MARK MAX9812LEXT+T 6 SC70 2.7 to 3.6 ABJ MAX9812HEXT+T 6 SC70 4.5 to 5.5 ABK MAX9813LEKA+T 8 SOT23 2.7 to 3.6 AEEU MAX9813HEKA+T 8 SOT23 4.5 to 5.5 AEEV +Denotes a lead(Pb)-free/RoHS-compliant package. For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. 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 OUTLINE NO. LAND PATTERN NO. 6 SC70 X6SN+1 21-0077 90-0189 8 SOT K8+1 21-0078 90-0176 Chip Information PROCESS: BiCMOS Maxim Integrated 9 MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias Revision History REVISION NUMBER REVISION DATE 0 4/03 Initial release 1 8/12 Added lead-free description 2 9/12 Added automotive qualified part DESCRIPTION PAGES CHANGED — 1, 9 1 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. 10 ________________________________Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © 2012 Maxim Integrated Products, Inc. The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.