19-2840; Rev 0; 4/03 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias Applications Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ 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 PART PINTEMP RANGE PACKAGE VCC (V) MAX9812LEXT-T -40°C to +85°C 6 SC70-6 2.7 to 3.6 Notebook Computers MAX9812HEXT-T -40°C to +85°C 6 SC70-6 4.5 to 5.5 PDAs MAX9813LEKA-T -40°C to +85°C 8 SOT23-8 2.7 to 3.6 Smart Phones MAX9813HEKA-T -40°C to +85°C 8 SOT23-8 4.5 to 5.5 Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet. Rail-to-Rail is a trademark of Nippon Motorola Ltd. Car Kit Adapters Digital Cameras 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 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX9812/MAX9813 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. 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) 6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW 8-Pin 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 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), GND = 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 VCC Supply Current ICC Shutdown Supply Current Amplifier Output Bias Voltage ICC_SHDN VOUT_DC Input Resistance RIN Voltage Gain AV MAX9812L/MAX9813L MAX9812H/MAX9813H Inferred from PSRR test PSRROUT 3.6 5.5 IBIAS = 0 230 SHDN = GND 1 1.5 1.65 MAX9812H/MAX9813H 2.25 2.5 2.75 19 20 90 100 85 VOH RL = 1kΩ to VCC/2 VOL f = 217Hz 100 f = 1kHz 100 f = 10kHz 90 VCC 0.1 12 24 CL Output Slew Rate 2 SR V 0.25 VOUT = 10mVP-P ZOUT VCC 0.1V 0.1 BW Output Impedance VCC 0.25V 0.1 IOUT_SC Sinking or sourcing dB dB RL = 1kΩ to VCC/2 Small-Signal -3dB Bandwidth V kΩ 21 RL = 10kΩ to VCC/2 Output Short-Circuit Current Output Capacitive-Load Stability µA 0.1 RL = 10kΩ to VCC/2 Output Voltage Swing µA 1.35 Input referred, TA = +25°C V 400 MAX9812L/MAX9813L DC Power-Supply Rejection Ratio 2.7 4.5 3 mA 400 kHz No sustained oscillations 50 pF f = 1kHz 0.5 Ω 1 V/µs VOUT = 1V step _______________________________________________________________________________________ Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias (VCC = 3.3V, IBIAS = 500µA (MAX9812L/MAX9813L), VCC = 5V, IBIAS = 800µA (MAX9812H/MAX9813H), GND = 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) BIAS Current Limit PSRRBIAS IBIAS_SC BIAS Capacitive-Load Stability Total Integrated BIAS Noise CBIAS Vn MAX9812L/MAX9813L 2.1 2.30 2.55 MAX9812H/MAX9813H 3.6 4.0 4.4 DC, TA = +25°C 70 Ω 0.1 80 f = 217Hz 80 f = 1kHz 75 f = 10kHz 55 BIAS short to GND 5 V 22 dB 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. _______________________________________________________________________________________ 3 MAX9812/MAX9813 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VCC = 3.3V (MAX9812L/MAX9813L), VCC = 5V (MAX9812H/MAX9813H), GND = 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 10M -40 -50 -60 -70 -80 -90 -100 10 100 1k 10k 100 10 100k 1k 10k 100k SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. SUPPLY VOLTAGE SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 260 SUPPLY CURRENT (µA) 230 225 220 215 280 MAX9812L 220 200 160 140 205 120 200 100 5 20 35 50 65 80 MAX9812H 180 210 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.06 0.05 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 6.0 TEMPERATURE (°C) -40 -25 -10 VBIAS vs. IBIAS VBIAS vs. TEMPERATURE MAX9812 toc07 5 20 35 50 65 TEMPERATURE (°C) SUPPLY VOLTAGE (V) 2.33 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 0.14 4.0001 MAX9812L 2.3000 4.0000 2.2999 MAX9812H 3.9999 2.2998 2.28 3.97 3.96 2.27 -40 -25 -10 5 20 35 50 TEMPERATURE (°C) 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) _______________________________________________________________________________________ VBIAS (H VERSION) (V) -40 -25 -10 MAX9812L 240 0.15 MAX9812 toc06 300 MAX9812 toc04 MAX9812H MAX9812 toc03 -30 FREQUENCY (Hz) 240 VBIAS (L VERSION) (V) -20 FREQUENCY (Hz) 245 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 SUPPLY CURRENT (µA) MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias 80 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias 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 VOUT = 1VRMS RL = 10kΩ 0.01 f = 100Hz f = 1kHz 0.001 0.001 1k 10k 100k 0 FREQUENCY (Hz) OUTPUT AMPLITUDE (VRMS) L VERSION BW = 22Hz TO 22kHz THD+N (%) f = 1kHz f = 10kHz 1 0.1 0.01 f = 100Hz INPUT-REFERRED NOISE vs. FREQUENCY 100 INPUTS AT AC GND INPUT-REFERRED NOISE (nV/√Hz) 100 MAX9812 toc11 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE 10 0.001 0 0.5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 1.0 70 50 30 10 1.5 10 10k 100k FREQUENCY (Hz) OFF-ISOLATION vs. FREQUENCY BIAS NOISE vs. FREQUENCY MAX9812 toc13 10 MAX9813 VIN1 = 100mVRMS 0 -10 -20 CROSSTALK (dB) BIAS NOISE (nV/√Hz) 1k 100 OUTPUT AMPLITUDE (VRMS) 10,000 MAX9812 toc12 100 MAX9812 toc14 10 1000 100 -30 -40 IN1 TO OUT WITH IN2 SELECTED -50 -60 -70 -80 -90 -100 10 10 100 1k FREQUENCY (Hz) 10k 100k 10 100 1k 10k 100k FREQUENCY (Hz) _______________________________________________________________________________________ 5 MAX9812/MAX9813 Typical Operating Characteristics (continued) (VCC = 3.3V (MAX9812L/MAX9813L), VCC = 5V (MAX9812H/MAX9813H), GND = 0V, RL = 10kΩ to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) 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), GND = 0V, RL = 10kΩ to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) LARGE-SIGNAL PULSE RESPONSE (RL = OPEN, CL = 10pF) SMALL-SIGNAL PULSE RESPONSE (RL = OPEN, CL = 10pF) MAX9812 toc16 MAX9812 toc15 IN 5mV/div IN 100mV/div OUT 50mV/div OUT 1V/div 0V 1µs/div 2µs/div OUT-OF-SHUTDOWN WAVEFORM INPUT FLOATING MAX9813 SWITCHING BETWEEN TWO INPUTS MAX9812 toc17 MAX9812 toc18 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 1ms/div 100µs/div OUTPUT OVERDRIVEN MAX9812 toc19 OUT 1V/div IN 500mV/div 2µs/div 6 _______________________________________________________________________________________ Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias PIN MAX9812L/ MAX9812H MAX9813L/ MAX9813H NAME FUNCTION 1 3 SHDN 2 2 GND 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 — 6 IN1 Amplifer Input 1 (MAX9813) — 5 IN2 Amplifier Input 2 (MAX9813) — 4 IN1/IN2 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 floating. Ground Amplifier Input (MAX9812) 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. 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 floating. 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 Pin Description 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 SCL 0.047µF SDA MICROCONTROLLER ADD 47kΩ HPS INT SHDN Figure 1. Typical Application Circuit 8 _______________________________________________________________________________________ 680kΩ Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias VCC VCC 8 4 VBIAS 5 BIAS SHDN 2.2kΩ 0.1µF 6 VBIAS 0.1µF VCC 2.2kΩ OUT BIAS 0.1µF VCC 2.2kΩ SHDN 0.1µF 0.1µF MAX9812 IN 1 7 6 IN1 3 3 0.1µF MAX9813 OUT 1 MIC1 0.1µF 5 MIC IN2 4 IN1/IN2 GND MIC2 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 Selector Guide PART PIN-PACKAGE VCC (V) TOP MARK MAX9812LEXT-T 6 SC70-6 2.7 to 3.6 ABJ MAX9812HEXT-T 6 SC70-6 4.5 to 5.5 ABK MAX9813LEKA-T 8 SOT23-8 2.7 to 3.6 AEEU MAX9813HEKA-T 8 SOT23-8 4.5 to 5.5 AEEV Chip Information MAX9812 TRANSISTOR COUNT: 264 MAX9813 TRANSISTOR COUNT: 269 PROCESS: BiCMOS _______________________________________________________________________________________ 9 MAX9812/MAX9813 Typical Operating Circuits Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) SC70, 6L.EPS MAX9812/MAX9813 Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias 10 ______________________________________________________________________________________ Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias CL E MIN MAX A A1 A2 0.90 0.00 0.90 1.45 0.15 1.30 b 0.28 0.45 C D E 0.09 2.80 2.60 0.20 3.00 3.00 SYMBOL CL CL E1 E1 1.50 L 0.30 L2 e PIN 1 I.D. DOT (SEE NOTE 6) SOT23, 8L .EPS SEE DETAIL "A" e b 1.75 0.60 0.25 BSC. 0.65 BSC. 1.95 REF. e1 0 0 8 e1 D C CL L2 A A2 GAUGE PLANE A1 SEATING PLANE C 0 L NOTE: 1. ALL DIMENSIONS ARE IN MILLIMETERS. 2. FOOT LENGTH MEASURED FROM LEAD TIP TO UPPER RADIUS OF HEEL OF THE LEAD PARALLEL TO SEATING PLANE C. 3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH & METAL BURR. 4. PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING. DETAIL "A" 5. COPLANARITY 4 MILS. MAX. 6. PIN 1 I.D. DOT IS 0.3 MM MIN. LOCATED ABOVE PIN 1. 7. SOLDER THICKNESS MEASURED AT FLAT SECTION OF LEAD BETWEEN 0.08mm AND 0.15mm FROM LEAD TIP. 8. MEETS JEDEC MO178. PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, SOT-23, 8L BODY APPROVAL DOCUMENT CONTROL NO. 21-0078 REV. D 1 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX9812/MAX9813 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)