MAX9810.pdf

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MAX9810 DS
19-2515; Rev 0; 7/02
Electret Condenser Microphone Cartridge
Preamplifier
General Description
The MAX9810 microphone preamplifier is intended for
use inside electret condenser microphone (ECM) car-
tridges. Current solutions use a FET as an impedance
converter. FETs have limited gain, are susceptible to
noise and require additional components external to the
ECM cartridge for biasing and amplification. The
MAX9810 replaces the FET with a high-gain, high-noise
rejection, low-output-impedance amplifier. Designed to
be integrated inside the ECM cartridge, the MAX9810
offers a flat frequency response, tightly controlled gain,
increased sensitivity, and high-noise rejection greatly
simplifying system design. Target applications include
ECM cartridges in cell phones, PDAs, notebooks, and
other portable audio devices.
The MAX9810 operates from a single 2.3V to 5.5V sup-
ply and consumes only 670µA of quiescent current. The
device features an internally generated 1.5V DC bias,
and is available in three internally fixed gain options
(24dB, 27dB, and 30dB). The MAX9810 is specified
over the extended temperature range (-40°C to +85°C)
and comes in a tiny 4-bump chip-scale package
(UCSP™) that is designed to fit inside the ECM cartridge.
Applications
Electret Condenser Microphone Cartridges In:
Cell Phones
Notebooks
PDAs
Portable Audio
Features
Replaces FET in Electret Condenser Microphone
2.3V to 5.5V Single-Supply Operation
Low-Impedance Output (<0.4
Ω
)
High PSRR: 82dB
Three High-Gain Options:
MAX9810A: 24dB
MAX9810B: 27dB
MAX9810C: 30dB
Internal Bias Voltage
Low Supply Current (670µA)
Rail-to-Rail ® Output
No Output Phase Reversal During Overload
Conditions
Available in a Tiny 4-Bump UCSP
Ordering Information
PART
TEMP RANGE
BUMP-
PACKAGE
TOP
MARK
MAX9810AEBS-T -40 o C to +85 o C
4 UCSP-4
AFS
MAX9810BEBS-T -40 o C to +85 o C
4 UCSP-4
AFT
MAX9810CEBS-T -40 o C to +85 o C
4 UCSP-4
AFU
Selector Guide
PART
BUMP-PACKAGE
GAIN
(dB)
Functional Diagram/
Typical Application Circuit
MAX9810AEBS-T
4 UCSP-4
24
MAX9810BEBS-T
4 UCSP-4
27
MAX9810CEBS-T
4 UCSP-4
30
POWER
Pin Configuration
V DD
MAX9810
TOP VIEW
(BUMP SIDE DOWN)
ELECTRET
MIC
OUTPUT
1
2
A
GND
V DD
OUT
GND
MAX9810
B
ECM CARTRIDGE
IN
GND
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
UCSP
USCP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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.
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Electret Condenser Microphone Cartridge
Preamplifier
ABSOLUTE MAXIMUM RATINGS
V DD to GND ..............................................................-0.3V to +6V
All Other Pins to GND.................................-0.3V to (V DD + 0.3V)
Continuous Current (IN, OUT) ..........................................±20mA
Output Short-Circuit Duration (to GND or V DD )..........Continuous
Continuous Power Dissipation (T A = +70°C)
4-Bump UCSP (derate 3.0mW°C above +70°C) .......238.8mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering) (Note 1)
Infrared (15s) ................................................................+220°C
Vapor Phase (60s) ........................................................+215°C
Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
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.
DC ELECTRICAL CHARACTERISTICS
(V DD = 3V, GND = 0, R L =
∞
, V IN = 0, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V DD
Inferred from PSRR test
2.3
5.5
V
Quiescent Supply Current
I DD
2.3V
V DD
≤
5.5V
670
950
µA
MAX9810A
1.3
1.48
1.7
Output Bias Voltage
V BIAS
MAX9810B
1.3
1.53
1.7
V
MAX9810C
1.3
1.58
1.8
Input Bias Current
I BIAS
(Note 3)
5
100
pA
Input Resistance
R IN
0.025
5
G Ω
Power-Supply Rejection Ratio
PSRR
2.3V < V DD < 5.5V (Note 4)
70
86
dB
R L = 10k Ω connected to 1.5V
V DD -
0.04
V DD -
0.015
Output Voltage Swing High
V OH
V
V DD -
0.15
V DD -
0.07
R L = 1k
Ω
connected to 1.5V
Output Voltage Swing Low
V OL
R L = 10k
Ω
connected to 1.5V
0.005
0.015
V
R L = 1k
Ω
connected to 1.5V
0.045
0.08
Output Short-Circuit Current
I SCC
V DD = 5V
12
mA
V DD = 2.3V
10
MAX9810A
23
24
25
Voltage Gain
A V
V IN = ±20mV
MAX9810B
26
27
28
dB
MAX9810C
29
30
31
2 _______________________________________________________________________________________
≤
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Electret Condenser Microphone Cartridge
Preamplifier
connected to 1.5V, C L = 20pF, C IN = 30pF connected to GND, V IN = 0, T A = T MIN to T MAX , unless
otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
Ω
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Small-Signal -3dB Bandwidth
BW SS
V OUT = 10mV P-P
900
kHz
Slew Rate
SR
V OUT = 1V step
0.03
V/µs
Settling Time to 0.1%
t s
V OUT = 1V step
1
µs
10Hz
60
Input-Noise Voltage Density
e n
R S = 0 (Note 5)
1kHz
16
nV/ √
Hz
10kHz
15
10Hz
5
Input-Noise Current Density
i n
1kHz
1
pA/
√
Hz
10kHz
1
Total Integrated Noise
Noise bandwidth = 20Hz to 7kHz
4
µV RMS
Signal-to-Noise Ratio
SNR
V OUT = 2V P-P , noise bandwidth = 20Hz to
7kHz
90
dB
Output Impedance
Z OUT
f IN = 1kHz
0.4
Ω
Power-Supply Rejection Ratio
PSRR
V DD = 3V, V RIPPLE = 100mV,
f RIPPLE = 1kHz
82
dB
RF Noise Immunity
1GHz—carrier, 1kHz—AM tone
82
dB
Total Harmonic Distortion Plus
Noise
THD + N
f IN = 1kHz, V OUT = 1V P-P , noise bandwidth
= 22Hz to 22kHz
0.02
%
Input Capacitance
C IN
3
pF
Turn-On Time
t ON
10
µs
Note 2: All specifications are 100% tested at T A = +25°C, temperature limits are guaranteed by design.
Note 3: Guaranteed by design. Not production tested.
Note 4: PSRR is input-referred.
Note 5: Noise measurement includes the noise contribution of the internal gain-setting resistors.
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(V DD = 3V, GND = 0, R L = 10k
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Electret Condenser Microphone Cartridge
Preamplifier
Typical Operating Characteristics
(V DD = 3V, GND = 0, R L = 10k Ω connected to 1.5V, C L = 20pF, C IN = 30pF connected to GND, V IN = 0, T A = +25°C, unless otherwise
noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
100
90
90
90
80
80
80
70
70
70
60
50
60
50
60
50
40
30
40
30
40
30
20
20
20
10
V DD = 5V
V RIPPLE = 100mV P-P
10
V DD = 3V
V RIPPLE = 100mV P-P
10
V DD = 2.3V
V RIPPLE = 100mV P-P
0
0
0
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX9810A
GAIN AND PHASE vs. FREQUENCY
MAX9810 toc04
INPUT-NOISE VOLTAGE
vs. FREQUENCY
INPUT-NOISE VOLTAGE
vs. FREQUENCY
60
180
1000
1000
V DD = 5V
V DD = 3V
40
120
20
GAIN
60
0
PHASE
0
100
100
-20
-60
-40
-120
R L = 10k
Ω
-60
-180
10
10
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
INPUT-NOISE CURRENT
vs. FREQUENCY
INPUT-NOISE CURRENT
vs. FREQUENCY
SIGNAL-TO-NOISE RATIO
vs. SUPPLY VOLTAGE
100
100
100
V DD = 5V
V DD = 3V
A-WEIGHTED FILTER
1kHz TONE
95
90
10
10
85
80
75
1
1
70
10
100
1k
10k
100k
10
100
1k
10k
100k
2
3
4
5
6
FREQUENCY (Hz)
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
4 _______________________________________________________________________________________
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Electret Condenser Microphone Cartridge
Preamplifier
Typical Operating Characteristics (continued)
(V DD = 3V, GND = 0, R L = 10k Ω connected to 1.5V, C L = 20pF, C IN = 30pF connected to GND, V IN = 0, T A = +25°C, unless otherwise
noted.)
1kHz REJECTION
vs. SWEPT AC SIGNAL ON POWER SUPPLY
OUTPUT VOLTAGE HIGH vs. LOAD
OUTPUT VOLTAGE LOW vs. LOAD
90
0
0.35
0.1 µ F BYPASS CAPACITOR
1nF BYPASS CAPACITOR
80
-0.05
0.30
70
-0.10
0.25
60
-0.15
-0.20
V DD = 2.3V
V DD = 2.3V
50
0.20
40
-0.25
-0.30
V DD = 3V
0.15
V DD = 3V
30
0.10
NO BYPASS CAPACITOR
20
-0.35
10
-0.40
0.05
0
-0.45
0
500
600
700
800
900
1000
0.1k
1k
10k
100k
1M
10M
0.1k
1k
10k
100k
1M
10M
CARRIER FREQUENCY (MHz)
LOAD ( Ω )
LOAD ( Ω )
OUTPUT IMPEDANCE
vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
100
0.1
0.1
V DD = 5V
V IN = 35mV RMS
22Hz TO 22kHz BANDWIDTH
V DD = 3V
V IN = 20mV RMS
22Hz TO 22kHz BANDWIDTH
10
0.01
0.01
1
0.1
0.001
0.001
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE
100
10
10
V DD = 5V
f IN = 1kHz
V DD = 3V
f IN = 1kHz
V DD = 2.3V
f IN = 1kHz
10
1
1
1
0.1
0.1
0.1
0.01
0.001
0.01
0.01
0
0.25
0.50
0.75
1.00
1.25
1.50
0
0.2
0.4
0.6
0.8
1.0
1.2
0
0.2
0.4
0.6
0.8
OUTPUT VOLTAGE (V RMS )
OUTPUT VOLTAGE (V RMS )
OUTPUT VOLTAGE (V RMS )
_______________________________________________________________________________________ 5
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