19-2753; Rev 0; 1/03
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
General Description
The MAX4063 is a differential-input microphone preampli-
fier optimized for high-performance, portable applica-
tions. The device features two selectable inputs,
differential outputs, adjustable gain, an integrated low-
noise bias source, and a low-power shutdown mode.
Two input paths provide both differential and single-
ended microphone sensing. The high-noise rejection of
the differential input is ideally suited to an internal micro-
phone where system noise and long-run PC board traces
can degrade low-level signals. The single-ended input
provides a simple connection to an external microphone.
The differential and single-ended inputs have indepen-
dent, adjustable gains that are set with a single external
resistor. Differential outputs provide a full-scale signal of
up to 6V
P-P
from a single 3V supply, optimizing the
dynamic range of the amplified signal. A complete shut-
down mode reduces the supply current to only 0.3µA
and disables the microphone bias for the ultimate in
power savings.
The MAX4063 operates from 2.4V to 5.5V and is specified
over the extended -40°C to +85°C operating temperature
range. The MAX4063 is available in both 16-pin thin QFN
(4mm x 4mm x 0.8mm) and 14-pin TSSOP packages.
o
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o
o
o
o
o
o
o
o
o
Features
2.4V to 5.5V Single-Supply Operation
Differential Inputs and Outputs
Adjustable Gain
High 95dB PSRR
High 79dB CMRR
Low-Noise, Integrated Microphone Bias
750µA Supply Current
0.3µA Shutdown Current
±4kV ESD Protection (AUX_IN)
THD+N: 0.05% at 1kHz
Available in Space-Saving Packages
14-Pin TSSOP
16-Pin Thin QFN (4mm x 4mm x 0.8mm)
MAX4063
Ordering Information
PART
MAX4063ETE*
MAX4063EUD
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN-EP**
14 TSSOP
Applications
Notebook Audio Systems
Tablet PCs
PDA Audio Systems
Signal Conditioning
*Future product—contact factory for availability.
**EP = Exposed paddle.
Typical Operating Circuit
2.4V TO 5.5V
6
V
CC
3
Pin Configurations
SHDN
INT/AUX 2
7
12 AUX_IN
ADJ
G2 1
INT/AUX
SHDN
2
3
14 G1
13 N.C.
12 AUX_IN
MAX4063
5 BIAS
V
BIAS
OUT 4
OUT 8
OUT 4
BIAS 5
V
CC
6
ADJ 7
MAX4063
11 GND
10 IN-
9
8
IN+
OUT
G1 G2
14 1
R
G
GND
11
9 IN+
10 IN-
TSSOP
Pin Configurations continued at end of data sheet.
________________________________________________________________
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.
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
MAX4063
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to GND). .................................-0.3V to +6V
Any Other Pin to GND ................................-0.3V to (V
CC
+ 0.3V)
Duration of Short Circuit to GND or V
CC
....................Continuous
Continuous Input Current (any pin) ................................ ±10mA
Continuous Power Dissipation (T
A
= +70°C)
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........667mW
16-Pin Thin QFN (derate 16.9mW/°C above +70°C) ..1349mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +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
(V
CC
= 3V, GND = 0V,
SHDN
= V
CC,
INT/AUX
= 0V, R
G
= 11.11kΩ, R
L
= 100kΩ to 1.5V, R
BIAS
=
∞,
V
OUT
is measured between OUT
and
OUT.
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
Supply Voltage Range
Supply Current
Output Common-Mode Voltage
Slew Rate
Supply Current in Shutdown
Output Short-Circuit Current
DIFFERENTIAL INPUT (INT/AUX = 0V)
Input Offset Voltage
Common-Mode Input Voltage Range
Maximum Differential Input Voltage
Small-Signal Bandwidth
Input Resistance
Input Resistance Match
Input Noise-Voltage Density
RMS Output Noise Voltage
Total Harmonic Distortion Plus Noise
V
OS
V
CM
BW
-3dB
R
IN
R
MATCH
e
n
V
NRMS
THD+N
A
V
= 20V/V, f = 1kHz
A
V
= 200V/V, f = 1kHz
A
V
= 20V/V, BW = 22Hz to 22kHz
A
V
= 20V/V, f = 1kHz, V
OUT
= 0.7V
RMS
,
BW = 22Hz to 22kHz
1V < V
CM
< 2V,
VOUT = 0.7V
RMS
RG = open
RG = 11.11kΩ
RG = 1.01kΩ
19.2
Either differential input
T
A
= +25°C
Inferred from CMRR test
1
1
600
100
1
70
12
225
0.05
2
20
200
70
95
85
86
dB
dB
20.8
V/V
±1
2
mV
V
V
kHz
kΩ
%
nV/√Hz
µV
RMS
%
SYMBOL
V
CC
I
CC
V
OCM
SR
I
SHDN
I
SC
A
V
= 20V/V
V
SHDN
= 0V
To GND
To V
CC
1.25
CONDITIONS
Inferred from PSRR test
MIN
2.4
0.75
1.5
±1
0.001
30
30
1
TYP
MAX
5.5
1.1
1.75
UNITS
V
mA
V
V/µs
µA
mA
V
DIFFMAX
A
V
= 2V/V
Differential Gain
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
A
VDIFF
CMRR
PSRR
V
CM
= 500mV
P-P
, f = 1kHz
T
A
= +25°C
T
A
= T
MIN
- TMAX
V
CC
= 5V
±100mV,
f = 1kHz
2
_______________________________________________________________________________________
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3V, GND = 0V,
SHDN
= V
CC,
INT/AUX
= 0V, R
G
= 11.11kΩ, R
L
= 100kΩ to 1.5V, R
BIAS
=
∞,
V
OUT
is measured between OUT
and
OUT.
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
AUXILIARY INPUT (INT/AUX = V
CC
)
Small-Signal Bandwidth
Input Resistance
Input Noise-Voltage Density
RMS Output Noise Voltage
Total Harmonic Distortion Plus Noise
Power-Supply Rejection Ratio
Voltage Gain
BIAS OUTPUT
Output Voltage
Output Resistance
Output Noise Voltage
Power-Supply Rejection Ratio
DIGITAL INPUTS (SHDN and
INT/AUX)
Input Leakage Current
Input Voltage High
Input Voltage Low
Shutdown Enable Time
Shutdown Disable Time
I
IN
V
INH
V
INL
t
ON
t
OFF
10
10
V
IN
= 0V or V
CC
0.7
✕
V
CC
0.3
✕
V
CC
±1
µA
V
V
µs
µs
V
OUT
R
OUT
V
NRMS
PSRR
I
BIAS
= 0.5mA to GND
I
BIAS
= 0.5mA to GND
I
BIAS
= 0.5mA to GND, BW = 22Hz to 22kHz
I
BIAS
= 0.5mA to GND, V
CC
= 2.4V to 5.5V
I
BIAS
= 0.5mA, V
CC
= 3V + 100mV
P-P
,
f = 1kHz
60
2
2.2
16
20
74
71
dB
30
V
Ω
µV
RMS
BW
-3dB
R
IN
en
V
NRMS
THD+N
PSRR
A
VAUX
f = 1kHz
BW = 22Hz to 22kHz
f = 1kHz, BW = 22Hz to 22kHz
T
A
= +25°C
T
A
= T
MIN
- T
MAX
V
OUT
= 0.7V
RMS
80
72
-19.5
-20
-20.5
230
100
200
620
0.007
100
kHz
kΩ
nV/√Hz
µV
RMS
%
dB
V/V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4063
Note 1:
All specifications are 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaranteed
by design, not production tested.
Note 2:
MAX4063 requires a 1µF capacitor from BIAS to ground and a 10pF capacitor from ADJ to OUT.
_______________________________________________________________________________________
3
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
MAX4063
Typical Operating Characteristics
(V
CC
= 3V, A
V
= 20V/V, R
L
≥
100kΩ to 1.5V,
SHDN
= V
CC
, V
OUT
is measured between OUT and
OUT.
T
A
= +25°C, unless otherwise
noted.)
GAIN vs. FREQUENCY
(NO LOAD)
MAX4063 toc01
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (DIFF INPUT)
MAX4063 toc02
SUPPLY CURRENT vs. TEMPERATURE
V
CC
= 5V
0.8
SUPPLY CURRENT (mA)
V
CC
= 3V
0.6
MAX4063 toc03
9
6
GAIN (dB)
V
CC
= 5V
A
V
= 2V/V
0
-20
-40
PSRR (dB)
-60
-80
-100
A
V
= 200V/V
-120
A
V
= 20V/V
1.0
3
0
-3
-6
-9
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
0.4
0.2
NO LOAD
-140
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
0
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SHUTDOWN SUPPLY CURRENT (nA)
0.8
SUPPLY CURRENT (mA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
NO LOAD
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0.001
-40
MAX4063 toc04
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4063 toc05
V
OH
vs. TEMPERATURE
MAX4063 toc06
0.9
100
1000
10
I
LOAD
= 2.5mA
100
V
OH
(mV)
10
1
0.1
0.01
I
LOAD
= 50µA
1
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
V
OL
vs. TEMPERATURE
MAX4063 toc07
V
OH
vs. LOAD CURRENT
V
OH
= V
CC
- V
OUT
350
300
V
OH
(mV)
250
200
150
100
100
50
0
0
1
2
3
4
5
0
V
CC
= 3V
V
OL
(mV)
MAX4063 toc08
V
OL
vs. LOAD CURRENT
300
250
200
150
V
CC
= 3V
MAX4063 toc09
1000
400
350
I
LOAD
= 2.5mA
100
V
OL
(mV)
10
I
LOAD
= 50µA
1
-40
-15
10
35
60
85
TEMPERATURE (°C)
50
0
LOAD CURRENT (mA)
1
2
3
4
5
LOAD CURRENT (mA)
4
_______________________________________________________________________________________
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
Typical Operating Characteristics (continued)
(V
CC
= 3V, A
V
= 20V/V, R
L
≥
100kΩ to 1.5V,
SHDN
= V
CC
, V
OUT
is measured between OUT and
OUT.
T
A
= +25°C, unless otherwise
noted.)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (DIFF INPUT)
MAX4063 toc10
MAX4063
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (AUX INPUT)
MAX4063 toc11
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (DIFF INPUT)
BW = 22Hz TO 22kHz
MAX4063 toc12
1
V
OUT
= 4.5V
P-P
1
V
OUT
= 4.5V
P-P
10
3V
0.1
THD+N (%)
THD+N (%)
0.1
3V
THD+N (%)
1
5V
0.01
5V
0.01
0.1
f = 1kHz
0.01
f = 10kHz
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V
P-P
)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (DIFF INPUT)
MAX4063 toc13
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (AUX INPUT)
MAX4063 toc14
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (AUX INPUT)
BW = 22Hz TO 22kHz
V
CC
= 5V
MAX4063 toc15
10
BW = 22Hz TO 22kHz
V
CC
= 5V
10
BW = 22Hz TO 22kHz
V
CC
= 5V
10
1
THD+N (%)
THD+N (%)
f = 1kHz
0.1
1
THD+N (%)
f = 1kHz
0.1
1
0.1
f = 1kHz
0.01
f = 10kHz
0.01
f = 10kHz
0.01
f = 10kHz
0.001
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V
P-P
)
0.001
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V
P-P
)
0.001
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V
P-P
)
INPUT-REFERRED NOISE
vs. FREQUENCY (DIFF INPUT)
MAX4063 toc16
MIC BIAS OUTPUT NOISE
MAX4063 toc17
SMALL-SIGNAL TRANSIENT RESPONSE
FOR DIFF INPUT
MAX4063 toc18
400
INPUT-REFERRED NOISE (nV/√Hz)
350
300
250
200
150
100
50
0
10
100
1k
FREQUENCY (Hz)
10k
V
CC
= 5V
BW = 22Hz TO 22kHz
DIFF
INPUT
5mV/div
20µV/div
DIFF
OUTPUT
50mV/div
100k
100ms/div
10µs/div
_______________________________________________________________________________________
5
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