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MAX4063_11

更新时间：2025-07-03 11:42:59
品牌：MAXIM
描述：Differential Microphone Preamplifier with Internal Bias and Complete Shutdown

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MAX4063_11 概述

Differential Microphone Preamplifier with Internal Bias and Complete Shutdown 差分麦克风前置放大器，内部偏置并可完全关断

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19-2753; Rev 1; 6/11  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
MAX4063  
General Description  
Features  
o 2.4V to 5.5V Single-Supply Operation  
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.  
o Differential Inputs and Outputs  
o Adjustable Gain  
o High 95dB PSRR  
o High 79dB CMRR  
o Low-Noise, Integrated Microphone Bias  
o 750µA Supply Current  
o 0.3µA Shutdown Current  
o
4kV ESD Protection (AUX_IN)  
o THD+N: 0.05% at 1kHz  
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  
o Available in Space-Saving Packages  
14-Pin TSSOP  
up to 6V  
from a single 3V supply, optimizing the  
P-P  
16-Pin TQFN (4mm x 4mm x 0.8mm)  
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.  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
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 TQFN  
(4mm x 4mm x 0.8mm) and 14-pin TSSOP packages.  
MAX4063ETE+  
MAX4063EUD+  
-40°C to +85°C  
-40°C to +85°C  
16 TQFN-EP*  
14 TSSOP  
*EP = Exposed pad.  
+Denotes a lead(pB)-free/RoHS-compliant package.  
Applications  
Notebook Audio Systems  
Tablet PCs  
Typical Operating Circuit  
2.4V TO 5.5V  
PDA Audio Systems  
6
Signal Conditioning  
V
CC  
3
2
7
INT/AUX  
ADJ  
SHDN  
Pin Configurations  
12  
AUX_IN  
+
4
8
MAX4063  
OUT  
G2  
INT/AUX  
SHDN  
OUT  
1
2
3
4
5
6
7
14 G1  
5
BIAS  
V
BIAS  
13 N.C.  
12 AUX_IN  
11 GND  
10 IN-  
OUT  
MAX4063  
9
IN+  
IN-  
BIAS  
V
9
8
IN+  
CC  
10  
ADJ  
OUT  
G1 G2  
14  
GND  
11  
1
TSSOP  
R
G
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  
ABSOLUTE MAXIMUM RATINGS  
Supply Voltage (V  
to GND). .................................-0.3V to +6V  
16-Pin TQFN (derate 25.0mW/°C above +70°C) ........2000mW  
Operating Temperature Range ...........................-40°C to +85°C  
Storage Temperature Range.............................-65°C to +150°C  
Lead Temperature (soldering, 10s) .................................+300°C  
Soldering Temperature (reflow) .......................................+260°C  
CC  
Any Other Pin to GND ................................-0.3V to (V  
+ 0.3V)  
CC  
Duration of Short Circuit to GND or V ....................Continuous  
CC  
Continuous Input Current (any pin) ................................ 10mA  
Continuous Power Dissipation (T = +70°C)  
A
14-Pin TSSOP (derate 10.0mW/°C above +70°C) .....796.8mW  
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.  
MAX4063  
ELECTRICAL CHARACTERISTICS  
(V  
= 3V, V  
= 0V, V  
= V  
V = 0V, R = 11.11kΩ, R = 100kΩ to 1.5V, R  
INT/AUX  
= ∞, V  
is measured between  
OUT  
GND  
SHDN  
CC  
CC,  
G
L
BIAS  
OUT and OUT. T = T  
to T  
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1 and 2)  
MAX A  
A
MIN  
PARAMETER  
Supply Voltage Range  
Supply Current  
SYMBOL  
CONDITIONS  
Inferred from PSRR test  
MIN  
TYP  
MAX  
5.5  
UNITS  
V
V
2.4  
CC  
CC  
I
0.75  
1.5  
1
1.1  
mA  
V
Output Common-Mode Voltage  
Slew Rate  
V
1.25  
1.75  
OCM  
SR  
A = 20V/V  
V
V/µs  
µA  
Supply Current in Shutdown  
I
V
= 0V  
SHDN  
0.001  
30  
1
2
SHDN  
To GND  
To V  
Output Short-Circuit Current  
I
mA  
SC  
30  
CC  
DIFFERENTIAL INPUT (V  
= 0V)  
INT/AUX  
Input Offset Voltage  
V
T
A
= +25°C  
1
mV  
V
OS  
Common-Mode Input Voltage Range  
Maximum Differential Input Voltage  
Small-Signal Bandwidth  
V
Inferred from CMRR test  
1
CM  
V
A = 2V/V  
V
1
V
DIFFMAX  
BW  
R
600  
100  
1
kHz  
kΩ  
%
-3dB  
IN  
Input Resistance  
Either differential input  
Input Resistance Match  
R
MATCH  
A = 20V/V, f = 1kHz  
70  
V
Input Noise-Voltage Density  
RMS Output Noise Voltage  
e
nV/√Hz  
n
A = 200V/V, f = 1kHz  
V
12  
V
A = 20V/V, BW = 22Hz to 22kHz  
V
225  
µV  
RMS  
NRMS  
A = 20V/V, f = 1kHz, V  
V
BW = 22Hz to 22kHz  
= 0.7V  
,
OUT  
RMS  
Total Harmonic Distortion Plus Noise  
THD+N  
0.05  
%
R
R
R
= open  
2
20  
200  
70  
95  
85  
86  
G
G
G
1V < V  
< 2V,  
CM  
Differential Gain  
A
= 11.11kΩ  
= 1.01kΩ  
19.2  
20.8  
V/V  
dB  
dB  
VDIFF  
V
= 0.7V  
RMS  
OUT  
Common-Mode Rejection Ratio  
Power-Supply Rejection Ratio  
CMRR  
PSRR  
V
= 500mV , f = 1kHz  
CM P-P  
T
A
T
A
= +25°C  
= T  
- T  
MIN  
MAX  
V
= 5V 100mV, f = 1kHz  
CC  
2
_______________________________________________________________________________________  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
MAX4063  
ELECTRICAL CHARACTERISTICS (continued)  
(V  
= 3V, V  
= 0V, V  
= V  
V = 0V, R = 11.11kΩ, R = 100kΩ to 1.5V, R  
INT/AUX  
= ∞, V  
is measured between  
OUT  
GND  
SHDN  
CC  
CC,  
G
L
BIAS  
OUT and OUT. T = T  
to T  
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1 and 2)  
MAX A  
A
MIN  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
AUXILIARY INPUT (INT/AUX = V  
Small-Signal Bandwidth  
Input Resistance  
)
CC  
BW  
R
230  
100  
kHz  
kΩ  
-3dB  
IN  
Input Noise-Voltage Density  
RMS Output Noise Voltage  
e
f = 1kHz  
BW = 22Hz to 22kHz  
THD+N f = 1kHz, BW = 22Hz to 22kHz  
200  
nV/√Hz  
n
V
620  
µV  
RMS  
NRMS  
Total Harmonic Distortion Plus Noise  
0.007  
100  
%
T
A
T
A
= +25°C  
80  
72  
Power-Supply Rejection Ratio  
PSRR  
dB  
V/V  
= T  
- T  
MIN  
MAX  
Voltage Gain  
A
V
= 0.7V  
-19.5  
-20  
-20.5  
30  
VAUX  
OUT  
RMS  
BIAS OUTPUT  
Output Voltage  
V
I
I
I
I
= 0.5mA to GND  
2
2.2  
16  
20  
74  
V
OUT  
BIAS  
BIAS  
BIAS  
BIAS  
Output Resistance  
Output Noise Voltage  
R
= 0.5mA to GND  
Ω
OUT  
V
= 0.5mA to GND, BW = 22Hz to 22kHz  
µV  
NRMS  
RMS  
= 0.5mA to GND, V  
= 2.4V to 5.5V  
60  
CC  
Power-Supply Rejection Ratio  
PSRR  
dB  
I
= 0.5mA, V  
= 3V + 100mV  
,
BIAS  
CC  
P-P  
71  
f = 1kHz  
DIGITAL INPUTS (SHDN and INT/AUX)  
Input Leakage Current  
Input Voltage High  
I
V
= 0V or V  
CC  
1
µA  
V
IN  
IN  
✕
V
0.7  
V
CC  
INH  
✕
Input Voltage Low  
V
0.3  
V
V
INL  
ON  
CC  
Shutdown Enable Time  
Shutdown Disable Time  
t
10  
10  
µs  
µs  
t
OFF  
Note 1: All specifications are 100% tested at T = +25°C. Specification limits over temperature (T = T  
to T  
) are guaranteed  
MAX  
A
A
MIN  
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  
Typical Operating Characteristics  
(V  
noted.)  
= 3V, A = 20V/V, R ≥ 100kΩ to 1.5V, V  
= V , V  
is measured between OUT and OUT. T = +25°C, unless otherwise  
SHDN  
CC  
V
L
CC OUT A  
GAIN vs. FREQUENCY  
(NO LOAD)  
POWER-SUPPLY REJECTION RATIO  
vs. FREQUENCY (DIFF INPUT)  
SUPPLY CURRENT vs. TEMPERATURE  
0
-20  
1.0  
0.8  
0.6  
0.4  
0.2  
0
V
= 5V  
= 2V/V  
CC  
9
6
A
V
V
= 5V  
CC  
6
V
= 3V  
CC  
-40  
3
-60  
A
= 20V/V  
V
0
-80  
-3  
-6  
-9  
-100  
-120  
-140  
A
= 200V/V  
100k  
V
NO LOAD  
10  
100  
1k  
10k  
100k  
1M  
10  
100  
1k  
10k  
1M  
-40 -25 -10  
5
20 35 50 65 80  
FREQUENCY (Hz)  
FREQUENCY (Hz)  
TEMPERATURE (°C)  
SHUTDOWN SUPPLY CURRENT  
vs. TEMPERATURE  
V
vs. TEMPERATURE  
OH  
SUPPLY CURRENT vs. SUPPLY VOLTAGE  
100  
10  
1000  
100  
10  
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
I
= 2.5mA  
LOAD  
1
0.1  
I
= 50µA  
LOAD  
0.01  
0.001  
NO LOAD  
1
-40  
-15  
10  
35  
60  
85  
-40  
-15  
10  
35  
60  
85  
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5  
SUPPLY VOLTAGE (V)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
V
OL  
vs. LOAD CURRENT  
V
OH  
vs. LOAD CURRENT  
V
OL  
vs. TEMPERATURE  
350  
300  
250  
200  
150  
100  
50  
400  
350  
300  
250  
200  
150  
100  
50  
1000  
100  
10  
V
= V - V  
CC OUT  
OH  
I
= 2.5mA  
LOAD  
V
= 3V  
CC  
V
= 3V  
CC  
I
= 50µA  
LOAD  
0
0
1
0
1
2
3
4
5
0
1
2
3
4
5
-40  
-15  
10  
35  
60  
85  
LOAD CURRENT (mA)  
LOAD CURRENT (mA)  
TEMPERATURE (°C)  
4
_______________________________________________________________________________________  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
MAX4063  
Typical Operating Characteristics (continued)  
(V  
noted.)  
= 3V, A = 20V/V, R ≥ 100kΩ to 1.5V, V  
= V , V  
is measured between OUT and OUT. T = +25°C, unless otherwise  
SHDN  
CC  
V
L
CC OUT A  
TOTAL HARMONIC DISTORTION PLUS  
NOISE vs. FREQUENCY (DIFF INPUT)  
TOTAL HARMONIC DISTORTION PLUS  
NOISE vs. FREQUENCY (AUX INPUT)  
TOTAL HARMONIC DISTORTION PLUS NOISE  
vs. OUTPUT AMPLITUDE (DIFF INPUT)  
1
1
10  
BW = 22Hz TO 22kHz  
V
= 4.5V  
P-P  
V
= 4.5V  
P-P  
OUT  
OUT  
1
0.1  
3V  
3V  
0.1  
0.1  
f = 1kHz  
5V  
5V  
0.01  
0.01  
0.01  
0.001  
f = 10kHz  
0.001  
10  
0.001  
100  
1k  
10k  
100k  
10  
100  
1k  
FREQUENCY (Hz)  
10k  
100k  
0
1
2
3
4
5
6
FREQUENCY (Hz)  
OUTPUT VOLTAGE (V  
)
P-P  
TOTAL HARMONIC DISTORTION PLUS NOISE  
vs. OUTPUT AMPLITUDE (DIFF INPUT)  
TOTAL HARMONIC DISTORTION PLUS NOISE  
vs. OUTPUT AMPLITUDE (AUX INPUT)  
TOTAL HARMONIC DISTORTION PLUS NOISE  
vs. OUTPUT AMPLITUDE (AUX INPUT)  
10  
10  
10  
BW = 22Hz TO 22kHz  
BW = 22Hz TO 22kHz  
BW = 22Hz TO 22kHz  
V
= 5V  
V
= 5V  
V
= 5V  
CC  
CC  
CC  
1
1
1
f = 1kHz  
f = 1kHz  
f = 1kHz  
0.1  
0.1  
0.1  
f = 10kHz  
0.01  
0.001  
0.01  
0.001  
0.01  
0.001  
f = 10kHz  
f = 10kHz  
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V  
)
OUTPUT VOLTAGE (V  
)
OUTPUT VOLTAGE (V  
)
P-P  
P-P  
P-P  
SMALL-SIGNAL TRANSIENT RESPONSE  
INPUT-REFERRED NOISE  
vs. FREQUENCY (DIFF INPUT)  
FOR DIFF INPUT  
MIC BIAS OUTPUT NOISE  
MAX4063 toc18  
MAX4063 toc17  
400  
350  
300  
250  
200  
150  
100  
50  
V
= 5V  
CC  
BW = 22Hz TO 22kHz  
DIFF  
INPUT  
5mV/div  
20µV/div  
DIFF  
OUTPUT  
50mV/div  
0
10µs/div  
10  
100  
1k  
10k  
100k  
100ms/div  
FREQUENCY (Hz)  
_______________________________________________________________________________________  
5
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
Typical Operating Characteristics (continued)  
(V  
noted.)  
= 3V, A = 20V/V, R ≥ 100kΩ to 1.5V, V  
= V , V  
is measured between OUT and OUT. T = +25°C, unless otherwise  
SHDN  
CC  
V
L
CC OUT  
A
LARGE-SIGNAL TRANSIENT RESPONSE  
SMALL-SIGNAL TRANSIENT RESPONSE  
FOR DIFF INPUT  
FOR AUX INPUT  
MAX4063 toc20  
MAX4063 toc19  
DIFF  
MAX4063  
S/E  
INPUT  
INPUT  
5mV/div  
100mV/div  
DIFF  
OUTPUT  
2V/div  
DIFF  
OUTPUT  
100mV/div  
10µs/div  
10µs/div  
LARGE-SIGNAL TRANSIENT RESPONSE  
OUTPUT OVERDRIVEN  
FOR AUX INPUT  
MAX4063 toc22  
MAX4063 toc21  
S/E  
INPUT  
100mV/div  
DIFF  
INPUT  
500mV/div  
DIFF  
OUTPUT  
2V/div  
DIFF  
OUTPUT  
2V/div  
10µs/div  
10µs/div  
6
_______________________________________________________________________________________  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
MAX4063  
Pin Description  
PIN  
NAME  
G2  
FUNCTION  
TSSOP  
TQFN  
Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for  
the differential amplifier (see Adjustable Differential Gain-Setting section).  
1
15  
Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select  
differential in or high to select auxiliary in.  
2
16  
INT/AUX  
Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown  
mode.  
3
4
5
6
7
1
2
3
4
5
SHDN  
OUT  
Amplifier Output. OUT is high impedance when in shutdown mode.  
External Electret Microphone Capsule Bias Output. Bypass BIAS with a 1µF capacitor to  
ground.  
BIAS  
V
Power Supply. Bypass the V  
to GND with a 0.1µF capacitor.  
CC  
CC  
Adjustable Gain Select for AUX_IN (see Auxiliary Input-Gain Adjustment section). Connect  
a 10pF capacitor between OUT and ADJ.  
ADJ  
8
7
9
OUT  
IN+  
Complementary Amplifier Output. OUT is high impedance in shutdown mode.  
Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+.  
Inverting Differential Amplifier Input. AC-couple the audio signal into IN-.  
Ground  
9
10  
11  
12  
13  
10  
IN-  
11  
GND  
AUX_IN  
N.C.  
12  
Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into AUX_IN.  
No Connection. Not internally connected.  
6, 8, 14  
Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for  
the differential amplifier.  
14  
—
13  
—
G1  
EP  
Exposed Pad (TQFN Only). Internally connected to GND. Connect to a large ground plane  
to maximize thermal performance. Not intended as an electrical connection point.  
external components. The MAX4063 has a complemen-  
Detailed Description  
tary output allowing CODECs and other devices with  
differential inputs to be optimally driven (see Functional  
Diagram). The MAX4063 includes a 0.3µA shutdown  
mode for ultimate power savings. The differential gain  
of the MAX4063 is set with a single resistor connected  
between the G1 and G2 pins. The MAX4063 has an  
internal default gain of 20V/V on the AUX_IN input. The  
AUX_IN gain can be increased with a single external  
resistor (see the Differential-Gain Adjustment and  
Auxiliary Input-Gain Adjustment sections).  
The MAX4063 is a differential microphone pre-  
amplifier providing high-quality amplification, optimized  
for use in computer and mobile applications. This device  
features adjustable gain, very high power-supply rejec-  
tion (95dB), and common-mode rejection (79dB), making  
it ideal for low-noise applications. The MAX4063 provides  
a differential input stage, making the device particularly  
effective when layout constraints force the microphone  
amplifier to be physically remote from the ECM micro-  
phone.  
Differential Input  
The main microphone amplifier is a low-noise, differen-  
tial input structure. This is an almost essential element  
when faced with amplification of low-amplitude analog  
signals in digitally intense environments such as note-  
The MAX4063 is capable of switching its output  
between the differential input and an inverting single-  
ended input. INT/AUX selects either the differential  
input or single-ended auxiliary input. In addition, the  
MAX4063 has an integrated microphone bias source,  
simplifying system design and eliminating the need for  
_______________________________________________________________________________________  
7
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
Functional Diagram  
2.4V TO 5.5V  
6
BIAS  
V
CC  
MAX4063  
MAX4063  
AUX_IN  
12  
INT/AUX 2  
7
ADJ  
14 G1  
OUT  
4
BIAS  
R
G
1
9
G2  
OUT  
8
5
IN+  
10  
3
IN-  
BIAS  
V
CC  
V
BIAS  
SHDN  
SHDN  
GND  
11  
book PCs or PDAs. Used correctly, the advantages  
over a single-ended solution are:  
Hence, an 11.11kΩ resistor yields a gain of 20V/V, or  
26dB. Leaving the pins unconnected results in a gain of  
2V/V. Gain is defined as:  
• Better power-supply noise rejection.  
• Less degradation from noise in PC board ground  
planes.  
For differential out:  
VOUT − VOUT  
• The microphone and preamplifier may be placed  
physically further apart, easing PC board layout  
restrictions.  
AVD  
=
V
− V  
IN+  
IN-  
The resistor can be either fixed or variable, allowing the  
use of a digitally controlled potentiometer to alter the  
gain under software control.  
Differential-Gain Adjustment  
The MAX4063 allows the user to alter the differential  
gain to optimize the signal-to-noise ratio (SNR) of their  
system. The gain is set by a single external resistor  
Auxiliary Input-Gain Adjustment  
The MAX4063 provides an option to increase the  
AUX_IN (see Figure 3). To increase the gain, connect  
(R ) connected between the G1 and G2 pins:  
G
resistor R  
between the ADJ and AUX_IN pins. R  
is  
ADJ  
ADJ  
200kΩ  
calculated from the following formula:  
R
=
G
A
− 2  
VD  
2MΩ  
AVAUX − 20  
RADJ  
=
(to increase the gain)  
where A is the required voltage gain.  
V
8
_______________________________________________________________________________________  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
MAX4063  
2.4V TO 5.5V  
6
V
CC  
100kΩ  
R
BIAS  
BIAS  
5
V
BIAS  
C
BIAS  
MAX4063  
12  
AUX_IN  
2
7
INT/AUX  
ADJ  
OUT  
14 G1  
4
8
1
9
G2  
OUT  
IN+  
10  
3
IN-  
V
CC  
SHDN  
SHDN  
GND  
11  
Figure 1. MAX4063 with Auxiliary Input Configuration  
where:  
compared to the input resistance of the amplifier—this is  
usually most noticeable at low frequencies. One way to  
avoid the need for matched or tight tolerance capaci-  
tors is to deliberately oversize the values on the differ-  
VOUT − VOUT  
AVAUX  
=
VAUX_IN  
ential inputs and to set the lower 3dB point (f  
) of the  
CUT  
amplifier by sizing the output capacitor appropriately.  
R
ADJ  
is placed between AUX_IN and ADJ.  
The input impedance matching on the differential input  
is typically 1%, allowing input capacitor matching to be  
effective at improving low-frequency PSRR.  
Input Capacitors  
The two differential microphone inputs and the single-  
ended auxiliary input of the MAX4063 have on-chip  
bias components, allowing the user to AC-couple any  
signals into the input. The input resistance is 100kΩ  
(typ), so the capacitor size may be chosen accordingly  
to define the LF rolloff desired. This can be calculated  
as:  
Common-Mode Rejection Ratio  
The common-mode rejection ratio (CMRR) refers to the  
amount of rejection that the amplifier is capable of pro-  
viding to any signal applied equally to the IN+ and IN-  
inputs. In the case of amplifying low-level microphone  
signals in noisy digital environments, it is a key figure of  
merit. In audio circuits, this is generally measured for  
C
IN  
= 1 / (2πf  
R )  
CUT IN  
This assumes a low source impedance is driving the  
inputs.  
V
IN  
as an AC signal:  
CMRR(dB) = A  
/ A  
DM  
CM  
A further consideration for the differential input is the  
effect of these series input capacitors on low-frequency,  
common-mode rejection. Any mismatch in the values of  
these two capacitors degrades the CMRR at frequen-  
cies where the impedance of the capacitor is significant  
where A  
is the differential gain, A  
is the common-  
DM  
mode gain.  
CM  
Input voltages should be sufficiently small such that the  
output is not clipped in either differential or common-  
_______________________________________________________________________________________  
9
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
mode application. The topology used in the MAX4063  
2.4V TO 5.5V  
means that the CMRR actually improves at higher dif-  
ferential gains—another advantage of using differential  
sensing.  
6
V
CC  
Auxiliary Input  
The auxiliary input is a single-ended input intended to  
be used with a jack-socket type microphone input  
(Figure 1). Internal DC-bias components (as on the  
main inputs) allow the input signal to be AC-coupled.  
Mechanically switched jack sockets can be used in  
conjunction with the INT/AUX select pin, allowing the  
auxiliary microphone input to be automatically selected  
when a jack socket is inserted.  
2
7
INT/AUX  
ADJ  
MAX4063  
MICROPHONE  
INPUT  
12  
5
AUX_IN  
MAX4063  
BIAS  
V
4
8
OUT  
BIAS  
V
CC  
SHDN  
IN+  
3
9
OUT  
SHDN  
Microphone Bias Voltage  
On the MAX4063 thin QFN package, connect the  
exposed paddle (backside of PRS) to the ground  
plane. The MAX4063 has an integrated low-noise, low-  
output impedance bias voltage. An optimum electret  
bias resistor can be set externally. This gives a low-  
noise, flexible solution that can run from 2.4V to 5.5V,  
which is suitable for hand-held devices such as PDAs  
that typically have audio power supplies in the 3V  
region (Figure 2).  
10  
IN-  
G1 G2  
14  
GND  
11  
1
Figure 2. MAX4063 Used for Biasing a Microphone  
Output  
Applications Information  
DC Bias  
In shutdown mode, the bias voltage is disabled. OUT  
and OUT have a low-noise, DC-bias voltage indepen-  
dent of the power supplies, resulting in superior PSRR  
performance. The MAX4063 outputs are high imped-  
ance when the part is in shutdown mode.  
Shutdown Mode  
The MAX4063 features a low-power, complete shut-  
down mode. When SHDN goes low, the supply current  
drops to 0.3µA, the output enters a high-impedance  
state, and the bias current to the microphone is  
switched off. Driving SHDN high enables the amplifier.  
SHDN should not be left unconnected.  
Differential Output  
The MAX4063 features a differential output stage (OUT  
and OUT), allowing optimum performance when con-  
nected to ADCs and CODECs with differential inputs.  
This differential output is particularly useful in designs  
where the microphone preamplifier is mounted some  
distance away from the CODEC/ADC, as the low-imped-  
ance, differential line provides excellent noise rejection  
and immunity (Figure 4).  
Power Supplies and Layout  
The MAX4063 operates from a 2.4V to 5.5V single sup-  
ply. Bypass the power supply with a 0.1µF capacitor to  
ground. In systems where analog and digital grounds  
are available, the MAX4063 should be connected to the  
analog ground.  
10 ______________________________________________________________________________________  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
MAX4063  
2.4V TO 5.5V  
6
V
CC  
R
ADJ  
MAX4063  
7
ADJ  
0.1µF  
2.2kΩ  
12 AUX_IN  
BIAS  
5
10pF  
V
BIAS  
1µF 14 G1  
4
OUT  
R
G
11kΩ  
1µF  
1
9
G2  
2.2kΩ  
OUT  
INT/AUX  
SHDN  
8
2
3
0.1µF  
0.1µF  
IN+  
V
CC  
10  
IN-  
SHDN  
GND  
11  
Figure 3. MAX4063 Used to Bias a Microphone Connected to the Auxiliary Input and the Differential Input  
______________________________________________________________________________________ 11  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
2.4V TO 5.5V  
6
V
CC  
MAX4063  
ADJ  
7
V
CC  
12  
5
AUX_IN  
BIAS  
MAX4063  
10pF  
V
BIAS  
1kΩ  
1kΩ  
1µF  
14 G1  
1µF  
4
OUT  
ADC  
11.1kΩ  
2.2µF  
1
9
G2  
1µF  
OUT  
8
2
0.1µF  
IN+  
INT/AUX  
0.1µF  
10  
3
IN-  
V
CC  
1kΩ  
1kΩ  
SHDN  
SHDN  
GND  
11  
2.2µF  
Figure 4. Using the MAX4063 with Differential Input/Differential Output Configuration  
12 ______________________________________________________________________________________  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
MAX4063  
Simplified Block Diagram  
2.4V TO 5.5V  
6
V
CC  
MAX4063  
INT/AUX  
2
7
12  
AUX_IN  
ADJ  
OUT  
4
8
SHDN  
IN+  
3
9
SHDN  
OUT  
10 IN-  
5
BIAS  
V
BIAS  
G1  
14  
G2 GND  
11  
1
Chip Information  
Pin Configurations (continued)  
PROCESS: BiCMOS  
TOP VIEW  
Package Information  
16 15 14 13  
+
For the latest package outline information and land patterns  
(footprints), go to www.maxim-ic.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.  
SHDN  
OUT  
1
2
3
4
12 AUX_IN  
11 GND  
10 IN-  
MAX4063  
BIAS  
EP*  
V
9
IN+  
CC  
LAND  
PACKAGE  
TYPE  
14 SSOP  
PACKAGE  
CODE  
U14+1  
OUTLINE NO.  
5
6
7
8
PATTERN NO.  
90-0113  
90-0070  
21-0066  
21-0139  
TQFN  
16 TQFN  
T1644+4  
*CONNECT EP TO GND.  
______________________________________________________________________________________ 13  
Differential Microphone Preamplifier with  
Internal Bias and Complete Shutdown  
Revision History  
REVISION  
NUMBER  
REVISION  
DATE  
PAGES  
CHANGED  
DESCRIPTION  
0
1/03  
Initial release  
—
Added EP information to Pin Description, updated power dissipation ratings,  
updated Ordering Information and Pin Configuration for lead-free parts  
1
6/11  
1, 2, 7, 13  
MAX4063  
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.  
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600  
© 2011 Maxim Integrated Products  
Maxim is a registered trademark of Maxim Integrated Products, Inc.  

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