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19-2840; Rev 0; 4/03
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(R) outputs, an industry-leading 100dB power-supply rejection ratio, and a very low 0.015% THD+N. Power-saving features include very low 230A 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 -40C to +85C extended operating temperature range. o o o o o o o o o o o
Features
PC2001 Compliant 100dB at 217Hz Power-Supply Rejection Ratio Very Low 230A 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 -40C to +85C
MAX9812/MAX9813
Ordering Information
PART MAX9812LEXT-T MAX9812HEXT-T MAX9813LEKA-T MAX9813HEKA-T PINTEMP RANGE PACKAGE -40C to +85C 6 SC70-6 -40C to +85C 6 SC70-6 -40C to +85C 8 SOT23-8 -40C to +85C 8 SOT23-8 VCC (V) 2.7 to 3.6 4.5 to 5.5 2.7 to 3.6 4.5 to 5.5
Applications
Notebook Computers PDAs Smart Phones Car Kit Adapters Digital Cameras Video Tape Recorders
Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet. Rail-to-Rail is a trademark of Nippon Motorola Ltd.
Simplified Block Diagrams
VCC VCC
SHDN BIAS REFERENCE 2.3V (L VERSION) 4.0V (H VERSION) BIAS REFERENCE 2.3V (L VERSION) 4.0V (H VERSION)
SHDN
IN1 IN 20dB OUT IN2 20dB OUT
IN1/IN2
MAX9812
GND GND
MAX9813
________________________________________________________________ Maxim Integrated Products
1
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Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias MAX9812/MAX9813
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 = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW 8-Pin SOT23 (derate 8.9mw/C above +70C) ............714mW 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 = 3.3V, IBIAS = 500A (MAX9812L/MAX9813L), VCC = 5V, IBIAS = 800A (MAX9812H/MAX9813H), GND = 0V, RL = open, SHDN = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER GENERAL Supply Voltage Range Supply Current Shutdown Supply Current Amplifier Output Bias Voltage Input Resistance Voltage Gain VCC ICC ICC_SHDN VOUT_DC RIN AV DC Power-Supply Rejection Ratio PSRROUT Input referred, TA = +25C f = 217Hz f = 1kHz f = 10kHz RL = 10k to VCC/2 VOH Output Voltage Swing VOL Output Short-Circuit Current Small-Signal -3dB Bandwidth Output Capacitive-Load Stability Output Impedance Output Slew Rate IOUT_SC BW CL ZOUT SR RL = 1k to VCC/2 RL = 10k to VCC/2 RL = 1k to VCC/2 Sinking or sourcing VOUT = 10mVP-P No sustained oscillations f = 1kHz VOUT = 1V step 3 VCC 0.25V 19 90 MAX9812L/MAX9813L MAX9812H/MAX9813H IBIAS = 0 SHDN = GND MAX9812L/MAX9813L MAX9812H/MAX9813H 1.35 2.25 Inferred from PSRR test 2.7 4.5 230 0.1 1.5 2.5 85 20 100 100 100 90 VCC 0.1 VCC 0.1V 0.1 0.1 12 400 50 0.5 1 0.25 24 mA kHz pF V/s V dB 21 3.6 5.5 400 1 1.65 2.75 V A A V k dB SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.3V, IBIAS = 500A (MAX9812L/MAX9813L), VCC = 5V, IBIAS = 800A (MAX9812H/MAX9813H), GND = 0V, RL = open, SHDN = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Amplifier Input Voltage-Noise Density Total Integrated Input Noise Off-Isolation SYMBOL en Vn CONDITIONS Inputs at AC GND f = 1kHz MIN TYP 40 5 75 60 0.04 % VOUT = 4VP-P (H version) 2.1 3.6 70 0.015 MAX UNITS nV/Hz VRMS dB
MAX9812/MAX9813
22Hz to 22kHz BW, inputs at AC GND Input referred, MAX9813 only f = 1kHz, RL = 10k to VCC/2, BW = 22Hz to 22kHz 1kHz 10kHz VOUT = 1VP-P (L version)
Total Harmonic Distortion Plus Noise BIAS Bias Output Voltage Range Bias Output Resistance Power-Supply Rejection Ratio (VCC to BIAS) BIAS Current Limit BIAS Capacitive-Load Stability Total Integrated BIAS Noise DIGITAL INPUTS (SHDN, IN1/IN2) Logic-Low Threshold Logic-High Threshold Logic Input Current Shutdown Enable Time Shutdown Disable Time IN1/IN2 Select Time
THD+N
VBIAS RBIAS
MAX9812L/MAX9813L MAX9812H/MAX9813H DC, TA = +25C
2.30 4.0 0.1 80 80 75 55
2.55 4.4
V
PSRRBIAS
f = 217Hz f = 1kHz f = 10kHz BIAS short to GND No sustained oscillations 22Hz to 22kHz BW 5
dB
IBIAS_SC CBIAS Vn VIL VIH IIN tSHDN_ON tSHDN_OFF tSEL
22 50 29
50
mA pF VRMS
0.8 2.0 SHDN = GND or VCC 95% of settled value 10 50 10 1
V V A ms s s
Note 1: All specifications are 100% tested at TA = +25C. Temperature limits are guaranteed by design.
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Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias MAX9812/MAX9813
Typical Operating Characteristics
(VCC = 3.3V (MAX9812L/MAX9813L), VCC = 5V (MAX9812H/MAX9813H), GND = 0V, RL = 10k to VCC/2, SHDN = VCC, TA = +25C, unless otherwise noted.)
GAIN vs. FREQUENCY
MAX9812 toc01
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 10 100 1k FREQUENCY (Hz)
MAX9812 toc02
POWER-SUPPLY REJECTION RATIO (VCC TO BIAS) vs. FREQUENCY
-10 -20 PSRR (VCC TO BIAS) (dB) -30 -40 -50 -60 -70 -80 -90 -100 VRIPPLE = 200mVP-P
MAX9812 toc03 MAX9812 toc06
40 30 20 10 0 -10 -20 10
RL = OPEN VOUT = 10mVP-P
0
VRIPPLE = 200mVP-P INPUT REFERRED
OUTPUT VOLTAGE GAIN (dB)
100
1k
10k
100k
1M
10M
PSRR (dB)
10k
100k
10
100
1k FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
SUPPLY CURRENT vs. TEMPERATURE
MAX9812 toc04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9812 toc05
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
0.15 SHUTDOWN SUPPLY CURRENT (A) 0.14 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.06 0.05
250 245 240 SUPPLY CURRENT (A) 235 230 225 220 215 210 205 200 -40 -25 -10 5 20 35 50 65 80 TEMPERATURE (C) MAX9812L MAX9812H
300 280 260 SUPPLY CURRENT (A) 240 220 200 180 160 140 120 100 MAX9812H MAX9812L
2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 6.0 SUPPLY VOLTAGE (V)
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (C)
VBIAS vs. TEMPERATURE
2.33 2.32 VBIAS (L VERSION) (V) 2.31 2.30 MAX9812H
MAX9812 toc07
VBIAS vs. IBIAS
4.03 4.02 2.3001 VBIAS (H VERSION) (V) VBIAS (L VERSION) (V) 4.01 4.00 3.99 MAX9812L 2.3002
MAX9812 toc08
4.0002
2.3000
4.0000 2.2999 MAX9812H 2.2998 3.9999
MAX9812L 2.29 2.28 2.27 -40 -25 -10 5 20 35 50 65 80 TEMPERATURE (C) 3.98 3.97 3.96
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)
4
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VBIAS (H VERSION) (V)
4.0001
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 = 10k to VCC/2, SHDN = VCC, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX9812 toc09
MAX9812/MAX9813
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE
H VERSION BW = 22Hz TO 22kHz 1 THD+N (%) f = 10kHz 0.1
MAX9812 toc10
1 BW = 22Hz TO 22kHz
10
0.1 THD+N (%)
VOUT = 1VRMS RL = 2k
0.01 VOUT = 1VRMS RL = 10k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.01 f = 100Hz f = 1kHz 0.001 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT AMPLITUDE (VRMS)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE
MAX9812 toc11
INPUT-REFERRED NOISE vs. FREQUENCY
INPUTS AT AC GND INPUT-REFERRED NOISE (nV/Hz) 70
MAX9812 toc12
100 L VERSION BW = 22Hz TO 22kHz 10 f = 1kHz f = 10kHz
100
THD+N (%)
1
50
0.1
30
0.01
f = 100Hz
0.001 0 0.5 1.0 1.5 OUTPUT AMPLITUDE (VRMS)
10 10 100 1k FREQUENCY (Hz) 10k 100k
BIAS NOISE vs. FREQUENCY
MAX9812 toc13
OFF-ISOLATION vs. FREQUENCY
0 -10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80 -90 IN1 TO OUT WITH IN2 SELECTED MAX9813 VIN1 = 100mVRMS
MAX9812 toc14
10,000
10
BIAS NOISE (nV/Hz)
1000
100
10 10 100 1k FREQUENCY (Hz) 10k 100k
-100 10 100 1k FREQUENCY (Hz) 10k 100k
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Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias MAX9812/MAX9813
Typical Operating Characteristics (continued)
(VCC = 3.3V (MAX9812L/MAX9813L), VCC = 5V (MAX9812H/MAX9813H), GND = 0V, RL = 10k to VCC/2, SHDN = VCC, TA = +25C, 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 2s/div
1s/div
OUT-OF-SHUTDOWN WAVEFORM INPUT FLOATING
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
BIAS 2V/div OUT 2V/div 2V/div IN1/IN2
1ms/div
100s/div
OUTPUT OVERDRIVEN
MAX9812 toc19
OUT 1V/div
IN 500mV/div
2s/div
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Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias
Pin Description
PIN MAX9812L/ MAX9812H 1 2 3 4 5 6 -- -- -- MAX9813L/ MAX9813H 3 2 1 8 7 -- 6 5 4 NAME FUNCTION 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 Output Positive Supply. Bypass VCC to GND with a 0.1F capacitor. Low-Noise Microphone Bias Output. 2.3V output for MAX9812L/MAX9813L. 4V output for MAX9812H/MAX9813H. Amplifier Input (MAX9812) Amplifer Input 1 (MAX9813) Amplifier Input 2 (MAX9813) Input Selector. When IN1/IN2 is high, IN1 is selected. When IN1/IN2 low, IN2 is selected.
MAX9812/MAX9813
SHDN GND OUT VCC BIAS IN IN1 IN2 IN1/IN2
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.
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 (70k). Driving SHDN high enables the MAX9812_/MAX9813_. SHDN is a high-impedance input and cannot be left floating.
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 85k. 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 10s switching time from one channel to the other.
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 +140C. The device restarts after the die temperature falls below +120C.
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.
Applications Information
Power-Up
The MAX9812_/MAX9813_ output typically settles to 95% within 10ms after power-up.
Output Stage
The MAX9812_/MAX9813_ rail-to-rail output (OUT) typically swings to within 100mV of the rails when driving 10k.
Typical Application Circuit
Figure 1 shows the MAX9813H used as a preamplifier with the MAX9760 3W audio power amplifier.
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7
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias MAX9812/MAX9813
VDD
0.1F VDD BIAS SVDD VDD 0.1F 220k IN1/IN2 VCC 0.1F IN1 HPF 22k IN2 2.2k BIAS 2.2k 0.1F SHDN HPF VDD OUT 0.1F 0.68F 0.68F 15k INL2 OUTL15k INL1 GAINLA OUTL+ 1F GAINLB 15k PVDD 0.047F 27.4k 33.2k 220F 10k
MAX9813
CODEC 0.68F 15k INR1
MAX9760
GND
0.68F
OUTR15k INR2 OUTR+ 15k GAINRA 33.2k 220F VDD 10k 680k
1k
1k
10k SCL SDA
GAINRB 27.4k 0.047F HPS
47k
MICROCONTROLLER
ADD INT SHDN
Figure 1. Typical Application Circuit
8
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Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias
Typical Operating Circuits
VCC VCC
MAX9812/MAX9813
4 VBIAS 5 BIAS VCC SHDN 0.1F 6 IN 1 0.1F OUT 3 MIC1 0.1F MIC GND 2 MIC2 5 4 IN2 0.1F 2.2k VBIAS 2.2k 0.1F 6 IN1 7 BIAS
8 VCC SHDN 3 0.1F OUT 1 0.1F
2.2k
MAX9812
MAX9813
IN1/IN2 GND 2
Pin Configurations
TOP VIEW
SHDN 1
6
IN
OUT GND
1 2
8 7
VCC BIAS IN1 IN2
GND 2
MAX9812
5
BIAS SHDN 3
MAX9813
6 5 IN1/IN2 4
OUT 3
4
VCC
SC70
SOT23
Selector Guide
PART MAX9812LEXT-T MAX9812HEXT-T MAX9813LEKA-T MAX9813HEKA-T PIN-PACKAGE 6 SC70-6 6 SC70-6 8 SOT23-8 8 SOT23-8 VCC (V) 2.7 to 3.6 4.5 to 5.5 2.7 to 3.6 4.5 to 5.5 TOP MARK ABJ ABK AEEU AEEV
Chip Information
MAX9812 TRANSISTOR COUNT: 264 MAX9813 TRANSISTOR COUNT: 269 PROCESS: BiCMOS
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9
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias MAX9812/MAX9813
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
10
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Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias
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.)
SOT23, 8L .EPS
MAX9812/MAX9813
SEE DETAIL "A" b
C L
e
SYMBOL A A1 A2 b C D E E1 L L2 e e1
MIN 0.90 0.00 0.90 0.28 0.09 2.80 2.60 1.50 0.30
MAX 1.45 0.15 1.30 0.45 0.20 3.00 3.00 1.75 0.60 0.25 BSC. 0.65 BSC. 1.95 REF.
C L
E
C L
E1
PIN 1 I.D. DOT (SEE NOTE 6) e1 D C
C L
0
0
8
L2 A A2 A1
SEATING PLANE C
GAUGE PLANE
L
0
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. 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:
DETAIL "A"
PACKAGE OUTLINE, SOT-23, 8L BODY
APPROVAL DOCUMENT CONTROL NO. REV.
21-0078
1 1
D
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 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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