MAX9812_V01 [MAXIM]
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias;
| 型号： | MAX9812_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias |
| 文件： | 总10页 (文件大小：280K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
General Description
Features
The MAX9812/MAX9813 are single/dual-input, 20dB
fixed-gain microphone amplifiers. They offer tiny pack-
aging 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 out-
puts, an industry-leading 100dB power-supply rejection
ratio, and a very low 0.015% THD+N. Power-saving fea-
tures include very low 230µA supply current and a total
shutdown mode that cuts the combined supply and
BIAS currents to only 100nA.
o PC2001 Compliant
o 100dB at 217Hz Power-Supply Rejection Ratio
o Very Low 230µA Quiescent Current
o Low 0.015% THD+N
o Available in Two Versions
MAX9812L/MAX9813L—2.7V to 3.6V
MAX9812H/MAX9813H—4.5V to 5.5V
o Internal Low-Noise Microphone Bias Supply
2.3V for MAX9812L/MAX9813L
4.0V for MAX9812H/MAX9813H
o 100nA Low-Power Shutdown Mode
o Rail-to-Rail Outputs
o 20dB Fixed Gain
The MAX9812 is a single amplifier in a 6-pin SC70
package (2mm x 2.1mm) and the MAX9813 is a dual-
input 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.
o Available in Tiny 6-Pin SC70 (2mm x 2.1mm) and
8-Pin SOT23 (3mm x 3mm) Packages
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.
o Extended Temperature Range -40°C to +85°C
Ordering Information
PIN-
PART
TEMP RANGE PACKAGE
V
CC
(V)
MAX9812LEXT+T
MAX9812HEXT+T
MAX9813LEKA+T
MAX9813HEKA+T
-40°C to +85°C 6 SC70
-40°C to +85°C 6 SC70
-40°C to +85°C 8 SOT23
-40°C to +85°C 8 SOT23
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
+Denotes a lead(Pb)-free/RoHS-compliant package.
Digital Cameras
Video Tape Recorders
Pin Configurations, Selector Guide, and Typical Operating
Circuits appear at end of data sheet.
Simplified Block Diagrams
V
CC
V
CC
SHDN
SHDN
REFERENCE
2.3V (L VERSION)
4.0V (H VERSION)
REFERENCE
2.3V (L VERSION)
4.0V (H VERSION)
BIAS
BIAS
IN1
IN2
IN
OUT
OUT
20dB
20dB
IN1/IN2
MAX9812
MAX9813
GND
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 3; 4/14
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
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
V
........................................................................-0.3V to +6.0V
CC
All Other Pins..............................................-0.3V to (V
+ 0.3V)
CC
Continuous Current (IN, SHDN, IN1, IN2, IN1/IN2)........... 20mA
OUT, BIAS Short-Circuit Duration (to GND or V ) ...Continuous
CC
Continuous Power Dissipation (T = +70°C)
A
SC70 (derate 3.1mW/°C above +70°C).......................245mW
SOT23 (derate 8.9mw/°C above +70°C) .....................714mW
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
(V
= 3.3V, I
= 500µA (MAX9812L/MAX9813L), V
= 5V, I
= 800µA (MAX9812H/MAX9813H), V
= 0V, R = open,
GND
L
CC
BIAS
CC
BIAS
SHDN = V , T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
CC
A
MIN
PARAMETER
GENERAL
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9812L/MAX9813L
MAX9812H/MAX9813H
= 0A
2.7
4.5
3.6
5.5
400
1
Inferred from
PSRR test
Supply Voltage Range
V
V
CC
Supply Current
I
I
230
0.1
1.5
2.5
85
µA
µA
CC
BIAS
Shutdown Supply Current
I
SHDN = GND
CC_SHDN
MAX9812L/MAX9813L
MAX9812H/MAX9813H
1.35
2.25
1.65
2.75
Amplifier Output Bias Voltage
V
V
OUT_DC
Input Resistance
Voltage Gain
R
kΩ
IN
A
19
90
20
21
dB
V
DC
100
100
100
90
f = 217Hz
f = 1kHz
f = 10kHz
Power-Supply Rejection Ratio
PSRR
Input referred, T = +25°C
dB
OUT
A
V
0.1
-
-
CC
R = 10kΩ to V /2
L
CC
V
OH
V
-
V
CC
0.1V
CC
Output Voltage Swing
R = 1kΩ to V /2
V
L
CC
0.25V
R = 10kΩ to V /2
0.1
0.1
12
L
CC
V
OL
R = 1kΩ to V /2
0.25
24
L
CC
Output Short-Circuit Current
Small-Signal -3dB Bandwidth
Output Capacitive-Load Stability
Output Impedance
I
Sinking or sourcing
= 10mV
3
mA
kHz
pF
OUT_SC
BW
V
400
50
OUT
P-P
C
No sustained oscillations
f = 1kHz
L
Z
0.5
1
Ω
OUT
Output Slew Rate
SR
V
= 1V step
V/µs
OUT
Maxim Integrated
2
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
ELECTRICAL CHARACTERISTICS (continued)
(V
= 3.3V, I
= 500µA (MAX9812L/MAX9813L), V
= 5V, I
= 800µA (MAX9812H/MAX9813H), V
= 0V, R = open,
GND
L
CC
BIAS
CC
BIAS
SHDN = V , T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
CC
A
MIN
PARAMETER
Amplifier Input Voltage-Noise
Density
SYMBOL
CONDITIONS
Inputs at AC GND f = 1kHz
MIN
TYP
MAX
UNITS
e
40
nV/√Hz
n
n
Total Integrated Input Noise
V
22Hz to 22kHz BW, inputs at AC GND
5
µV
RMS
1kHz
75
60
Input referred, MAX9813
only
Off-Isolation
dB
%
10kHz
V
= 1V
OUT
(L version)
P-P
0.04
f = 1kHz, R = 10kΩ to
L
Total Harmonic Distortion Plus
Noise
V
/2, BW = 22Hz to
CC
THD+N
V
= 4V
OUT
(H version)
P-P
22kHz
0.015
BIAS
MAX9812L/MAX9813L
MAX9812H/MAX9813H
2.1
3.6
2.30
4.0
0.1
80
2.55
4.4
Bias Output Voltage Range
Bias Output Resistance
V
V
BIAS
R
Ω
BIAS
DC, T = +25°C
A
70
f = 217Hz
80
Power-Supply Rejection Ratio
PSRR
dB
BIAS
(V
CC
to BIAS)
f = 1kHz
75
f = 10kHz
55
BIAS Current Limit
I
BIAS short to GND
No sustained oscillations
22Hz to 22kHz BW
5
22
50
mA
pF
BIAS_SC
BIAS Capacitive-Load Stability
Total Integrated BIAS Noise
DIGITAL INPUTS (SHDN, IN1/IN2)
Logic-Low Threshold
C
50
BIAS
V
29
µV
RMS
n
V
0.8
1
V
V
IL
IH
IN
Logic-High Threshold
V
2.0
Logic Input Current
I
SHDN = GND or V
µA
CC
Shutdown Enable Time
t
95% of settled value
10
ms
SHDN_ON
Shutdown Disable Time
t
50
10
µs
µs
SHDN_OFF
IN1/IN2 Select Time
t
SEL
Note 1: All specifications are 100% tested at T = +25°C. Temperature limits are guaranteed by design.
A
3
Maxim Integrated
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Typical Operating Characteristics
(V
= 3.3V (MAX9812L/MAX9813L), V
= 5V (MAX9812H/MAX9813H), V
= 0V, R = 10kΩ to V /2, SHDN = V , T = +25°C,
GND
L CC CC A
CC
CC
unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
(V TO BIAS) vs. FREQUENCY
CC
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
GAIN vs. FREQUENCY
0
-10
-20
-30
-40
-50
-60
-70
-80
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
40
30
20
10
0
R = OPEN
V
= 200mV
P-P
L
V
= 200mV
RIPPLE P-P
RIPPLE
V
= 10mV
OUT
P-P
INPUT REFERRED
-90
-100
-110
-120
-130
-140
-150
-10
-20
10
100
1k
10k
100k
1M
10M
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
300
280
260
240
220
200
180
160
140
120
100
0.15
0.14
0.13
0.12
0.11
0.10
0.09
0.08
0.07
0.06
0.05
250
245
240
235
230
225
220
215
210
205
200
MAX9812L
MAX9812H
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
-40 -25 -10
5
20 35 50 65 80
TEMPERATURE (°C)
TEMPERATURE (°C)
V
BIAS
vs. TEMPERATURE
V vs. I
BIAS BIAS
MAX9812 toc07
MAX9812 toc08
4.03
4.02
2.3002
2.3001
2.3000
2.2999
2.2998
2.2997
4.0002
4.0001
2.33
2.32
2.31
2.30
2.29
2.28
2.27
4.01
4.00
3.99
MAX9812H
MAX9812L
4.0000
3.9999
MAX9812L
MAX9812H
3.98
3.97
3.96
3.9998
-40 -25 -10
5
20 35 50 65 80
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
TEMPERATURE (°C)
I
(mA)
BIAS
Maxim Integrated
4
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Typical Operating Characteristics (continued)
(V
= 3.3V (MAX9812L/MAX9813L), V
= 5V (MAX9812H/MAX9813H), V
= 0V, R = 10kΩ to V /2, SHDN = V , T = +25°C,
GND
L CC CC A
CC
CC
unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
1
10
BW = 22Hz TO 22kHz
H VERSION
BW = 22Hz TO 22kHz
1
0.1
V
= 1V
RMS
OUT
L
0.1
0.01
R = 2kΩ
f = 10kHz
V
= 1V
0.01
0.001
OUT
L
RMS
f = 100Hz
R = 10kΩ
f = 1kHz
0.001
10
100
1k
10k
100k
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT AMPLITUDE (V
FREQUENCY (Hz)
)
RMS
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
INPUT-REFERRED NOISE vs. FREQUENCY
100
100
INPUTS AT AC GND
L VERSION
BW = 22Hz TO 22kHz
10
1
f = 1kHz
f = 10kHz
70
50
0.1
30
10
0.01
0.001
f = 100Hz
10
100
1k
10k
100k
0
0.5
1.0
1.5
FREQUENCY (Hz)
OUTPUT AMPLITUDE (V
)
RMS
OFF-ISOLATION vs. FREQUENCY
BIAS NOISE vs. FREQUENCY
10
0
10,000
1000
100
MAX9813
= 100mV
V
IN1
RMS
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
IN1 TO OUT WITH
IN2 SELECTED
10
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
Maxim Integrated
5
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Typical Operating Characteristics (continued)
(V
= 3.3V (MAX9812L/MAX9813L), V
= 5V (MAX9812H/MAX9813H), V
= 0V, R = 10kΩ to V /2, SHDN = V , T = +25°C,
CC
CC
GND
L
CC
CC
A
unless otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE
(R = OPEN, C = 10pF)
LARGE-SIGNAL PULSE RESPONSE
(R = OPEN, C = 10pF)
L
L
L
L
MAX9812 toc15
MAX9812 toc16
IN
IN
5mV/div
100mV/div
OUT
OUT
50mV/div
1V/div
0V
1μs/div
2μs/div
MAX9813
SWITCHING BETWEEN TWO INPUTS
OUT-OF-SHUTDOWN WAVEFORM
INPUT UNCONNECTED
MAX9812 toc18
MAX9812 toc17
IN2 = 200mV AT 20kHz
P-P
IN1 = 100mV AT 10kHz
P-P
SHDN
2V/div
OUT
1V/div
2V/div
BIAS
2V/div
OUT
2V/div
IN1/IN2
100μs/div
1ms/div
OUTPUT OVERDRIVEN
MAX9812 toc19
OUT
1V/div
IN
500mV/div
2μs/div
Maxim Integrated
6
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Pin Description
PIN
NAME
FUNCTION
Active-Low Shutdown Input. Connect SHDN to V
MAX9812L/
MAX9812H
MAX9813L/
MAX9813H
for normal operation. Connect SHDN
CC
1
3
SHDN
to GND for shutdown. SHDN is a high-impedance input; do not leave unconnected.
2
3
4
2
1
8
GND
OUT
Ground
Amplifier Output
V
Positive Supply. Bypass V
to GND with a 0.1µF capacitor.
CC
CC
Low-Noise Microphone Bias Output. 2.3V output for MAX9812L/MAX9813L. 4V output for
MAX9812H/MAX9813H.
5
7
BIAS
6
—
6
IN
Amplifier Input (MAX9812)
Amplifer Input 1 (MAX9813)
Amplifier Input 2 (MAX9813)
—
—
—
IN1
IN2
5
4
IN1/IN2 Input Selector. When IN1/IN2 is high, IN1 is selected. When IN1/IN2 low, IN2 is selected.
The output DC bias point is set to 1.5V for the MAX9812L/
Detailed Description
MAX9813L and 2.5V for the MAX9812H/MAX9813H.
The MAX9812_/MAX9813_ are low-power fixed-gain
microphone amplifiers available in a single- or dual-
input configuration. The gain is set at 10V/V (20dB) with
a 400kHz, -3dB bandwidth. They also feature a low-
noise, integrated microphone input bias voltage.
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.
Single/Dual Input
The MAX9812L/MAX9812H are single-input amplifiers
and the MAX9813L/MAX9813H are dual-input ampli-
fiers. 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 dri-
ven 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.
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 overheat-
ing caused by shorting the outputs. This protection fea-
ture 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.
PC2001 Low-Noise Microphone BIAS
The MAX9812_/MAX9813_ provide a low-noise voltage
BIAS designed for biasing electret condenser micro-
phone (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 ver-
sion (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.
Typical Application Circuit
Figure 1 shows the MAX9813H used as a preamplifier
with the MAX9760 3W audio power amplifier.
Output Stage
The MAX9812_/MAX9813_ rail-to-rail output (OUT) typical-
ly swings to within 100mV of the rails when driving 10kΩ.
7
Maxim Integrated
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
V
DD
0.1μF
V
PV
DD
DD
0.047μF
BIAS
SV
27.4kΩ
DD
33.2kΩ
15kΩ
1μF
GAINLB
V
DD
220μF
10kΩ
0.1μF
GAINLA
OUTL+
220kΩ
15kΩ
0.1μF
V
CC
IN1/IN2
INL1
INL2
INR1
INR2
OUT
0.1μF
0.68μF
0.68μF
IN1
OUTL-
15kΩ
15kΩ
15kΩ
HPF
22kΩ
MAX9813
CODEC
IN2
MAX9760
0.68μF
0.68μF
2.2kΩ
BIAS
SHDN
OUTR-
GND
HPF
2.2kΩ
OUTR+
V
DD
0.1μF
220μF
10kΩ
15kΩ
V
GAINRA
GAINRB
DD
33.2kΩ
27.4kΩ
1kΩ
1kΩ
10kΩ
680kΩ
SCL
SDA
ADD
INT
0.047μF
47kΩ
HPS
MICROCONTROLLER
SHDN
Figure 1. Typical Application Circuit
Maxim Integrated
8
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Typical Operating Circuits
V
CC
V
CC
8
4
V
V
0.1μF
BIAS
7
6
0.1μF
BIAS
5
6
V
V
CC
CC
BIAS
IN1
BIAS
IN
3
1
1
3
2.2kΩ
2.2kΩ
SHDN
SHDN
2.2kΩ
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
MAX9813
MAX9812
OUT
OUT
MIC1
5
4
MIC
IN2
IN1/IN2
MIC2
GND
GND
2
2
Pin Configurations
TOP VIEW
+
+
SHDN
1
2
3
6
IN
OUT
GND
1
2
3
4
8
7
6
5
V
CC
BIAS
IN1
MAX9812
GND
OUT
5
4
BIAS
MAX9813
SHDN
IN1/IN2
IN2
V
CC
SC70
SOT23
Package Information
Selector Guide
For the latest package outline information and land patterns (foot-
prints), 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.
TOP
PART
PIN-PACKAGE
V
(V)
CC
MARK
MAX9812LEXT+T
MAX9812HEXT+T
MAX9813LEKA+T
MAX9813HEKA+T
6 SC70
6 SC70
2.7 to 3.6
4.5 to 5.5
2.7 to 3.6
4.5 to 5.5
ABJ
ABK
LAND
PATTERN NO.
PACKAGE
TYPE
PACKAGE
CODE
8 SOT23
8 SOT23
AEEU
AEEV
OUTLINE NO.
90-0189
90-0176
6 SC70
8 SOT
X6SN+1
K8+1
21-0077
21-0078
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
9
Maxim Integrated
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
2
3
4/03
8/12
9/12
4/14
Initial release
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1, 9
1
Added lead-free description
Added automotive qualified part
Removed automotive qualified part and references
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
© 2014 Maxim Integrated Products, Inc. The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
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