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 6VP-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 TQFN
(4mm x 4mm x 0.8mm) and 14-pin TSSOP packages.
Applications
Features
o2.4V to 5.5V Single-Supply Operation
oDifferential Inputs and Outputs
oAdjustable Gain
oHigh 95dB PSRR
oHigh 79dB CMRR
oLow-Noise, Integrated Microphone Bias
o750µA Supply Current
o0.3µA Shutdown Current
o±4kV ESD Protection (AUX_IN)
oTHD+N: 0.05% at 1kHz
oAvailable in Space-Saving Packages
14-Pin TSSOP
16-Pin TQFN (4mm x 4mm x 0.8mm)
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
________________________________________________________________
Maxim Integrated Products
1
IN-
IN+
BIAS
10
9
5
AUX_IN
12
SHDN
3
6
VBIAS
VCC
2.4V TO 5.5V
MAX4063
INT/AUX 2
OUT 8
OUT 4
ADJ 7
RG
GND
11
1
14
G1 G2
14
13
12
11
10
9
8
1
2
3
4
5
6
7
G1
N.C.
AUX_IN
GNDOUT
SHDN
INT/AUX
G2
MAX4063
IN-
IN+
OUTADJ
VCC
BIAS
TSSOP
+
Typical Operating Circuit
Ordering Information
19-2753; Rev 1; 6/11
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.
Notebook Audio Systems
Tablet PCs
PDA Audio Systems
Signal Conditioning
PART TEMP RANGE PIN-PACKAGE
MAX4063ETE+ -40°C to +85°C 16 TQFN-EP*
MAX4063EUD+ -40°C to +85°C 14 TSSOP
Pin Configurations
Pin Configurations continued at end of data sheet.
*EP = Exposed pad.
+
Denotes a lead(pB)-free/RoHS-compliant package.
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = 3V, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG= 11.11kΩ, RL= 100kΩto 1.5V, RBIAS = ∞, VOUT is measured between
OUT and OUT. TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1 and 2)
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.
Supply Voltage (VCC to GND). .................................-0.3V to +6V
Any Other Pin to GND ................................-0.3V to (VCC + 0.3V)
Duration of Short Circuit to GND or VCC ....................Continuous
Continuous Input Current (any pin) ................................ ±10mA
Continuous Power Dissipation (TA= +70°C)
14-Pin TSSOP (derate 10.0mW/°C above +70°C) .....796.8mW
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VCC Inferred from PSRR test 2.4 5.5 V
Supply Current ICC 0.75 1.1 mA
Output Common-Mode Voltage VOCM 1.25 1.5 1.75 V
Slew Rate SR AV = 20V/V ±1 V/µs
Supply Current in Shutdown I SHDN V SHDN = 0V 0.001 1 µA
To GND 30
Output Short-Circuit Current ISC To VCC 30 mA
DIFFERENTIAL INPUT (VINT/AUX = 0V)
Input Offset Voltage VOS TA = +25°C ±1mV
Common-Mode Input Voltage Range VCM Inferred from CMRR test 1 2 V
Maximum Differential Input Voltage VDIFFMAX AV = 2V/V 1 V
Small-Signal Bandwidth BW-3dB 600 kHz
Input Resistance RIN Either differential input 100 kΩ
Input Resistance Match RMATCH 1%
AV = 20V/V, f = 1kHz 70
Input Noise-Voltage Density enAV = 200V/V, f = 1kHz 12 nV/√Hz
RMS Output Noise Voltage VNRMS AV = 20V/V, BW = 22Hz to 22kHz 225 µVRMS
Total Harmonic Distortion Plus Noise THD+N AV = 20V/V, f = 1kHz, VOUT = 0.7VRMS,
BW = 22Hz to 22kHz 0.05 %
RG = open 2
RG = 11.11kΩ19.2 20 20.8Differential Gain AVDIFF 1V < VCM < 2V,
VOUT = 0.7VRMS RG = 1.01kΩ200
V/V
Common-Mode Rejection Ratio CMRR VCM = 500mVP-P, f = 1kHz 70 dB
TA = +25°C 95
TA = TMIN - TMAX 85Power-Supply Rejection Ratio PSRR
VCC = 5V ±100mV, f = 1kHz 86
dB
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3V, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG= 11.11kΩ, RL= 100kΩto 1.5V, RBIAS = ∞, VOUT is measured between
OUT and OUT. TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1 and 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AUXILIARY INPUT (INT/AUX = VCC)
Small-Signal Bandwidth BW-3dB 230 kHz
Input Resistance RIN 100 kΩ
Input Noise-Voltage Density enf = 1kHz 200 nV/√Hz
RMS Output Noise Voltage VNRMS BW = 22Hz to 22kHz 620 µVRMS
Total Harmonic Distortion Plus Noise THD+N f = 1kHz, BW = 22Hz to 22kHz 0.007 %
TA = +25°C 80 100
Power-Supply Rejection Ratio PSRR TA = TMIN - TMAX 72 dB
Voltage Gain AVAUX VOUT = 0.7VRMS -19.5 -20 -20.5 V/V
BIAS OUTPUT
Output Voltage VOUT IBIAS = 0.5mA to GND 2 2.2 V
Output Resistance ROUT IBIAS = 0.5mA to GND 16 30 Ω
Output Noise Voltage VNRMS IBIAS = 0.5mA to GND, BW = 22Hz to 22kHz 20 µVRMS
IBIAS = 0.5mA to GND, VCC = 2.4V to 5.5V 60 74
Power-Supply Rejection Ratio PSRR IBIAS = 0.5mA, VCC = 3V + 100mVP-P,
f = 1kHz 71 dB
DIGITAL INPUTS (SHDN and INT/AUX)
Input Leakage Current IIN VIN = 0V or VCC ±1µA
Input Voltage High VINH 0.7 ✕ VCC V
Input Voltage Low VINL 0.3 ✕ VCC V
Shutdown Enable Time tON 10 µs
Shutdown Disable Time tOFF 10 µs
Note 1: All specifications are 100% tested at TA= +25°C. Specification limits over temperature (TA= TMIN to TMAX) 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.
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
4 _______________________________________________________________________________________
MAX4063 toc01
FREQUENCY (Hz)
GAIN (dB)
100k10k1k100
-6
-3
0
3
6
9
-9
10 1M
GAIN vs. FREQUENCY
(NO LOAD)
VCC = 5V
AV = 2V/V
MAX4063 toc02
FREQUENCY (Hz)
PSRR (dB)
100k10k1k100
-100
-120
-80
-60
-40
-20
0
-140
10 1M
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (DIFF INPUT)
AV = 200V/V
AV = 20V/V
SUPPLY CURRENT vs. TEMPERATURE
MAX4063 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
80655035205-10-25
0.2
0.4
0.6
0.8
1.0
0
-40
VCC = 3V
VCC = 5V
NO LOAD
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4063 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.04.53.5 4.03.02.5
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0
2.0 5.5
NO LOAD
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4063 toc05
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
603510-15
0.01
0.1
1
10
100
0.001
-40 85
VOH vs. TEMPERATURE
MAX4063 toc06
TEMPERATURE (°C)
VOH (mV)
603510-15
10
100
1000
1
-40 85
ILOAD = 2.5mA
ILOAD = 50µA
VOL vs. TEMPERATURE
MAX4063 toc07
TEMPERATURE (°C)
VOL (mV)
603510-15
10
100
1000
1
-40 85
ILOAD = 2.5mA
ILOAD = 50µA
VOH vs. LOAD CURRENT
MAX4063 toc08
LOAD CURRENT (mA)
VOH (mV)
4321
50
100
150
200
250
300
350
400
0
05
VOH = VCC - VOUT
VCC = 3V
VOL vs. LOAD CURRENT
MAX4063 toc09
LOAD CURRENT (mA)
VOL (mV)
432105
50
100
150
200
250
300
350
0
VCC = 3V
Typical Operating Characteristics
(VCC = 3V, AV= 20V/V, RL≥100kΩto 1.5V, VSHDN = VCC, VOUT is measured between OUT and OUT. TA= +25°C, unless otherwise
noted.)
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(VCC = 3V, AV= 20V/V, RL≥100kΩto 1.5V, VSHDN = VCC, VOUT is measured between OUT and OUT. TA= +25°C, unless otherwise
noted.)
10 1k100 10k 100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (DIFF INPUT)
MAX4063 toc10
FREQUENCY (Hz)
THD+N (%)
1
0.001
0.01
0.1
VOUT = 4.5VP-P
5V
3V
10 1k100 10k 100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (AUX INPUT)
MAX4063 toc11
FREQUENCY (Hz)
THD+N (%)
1
0.001
0.01
0.1
VOUT = 4.5VP-P
5V
3V
10
0.001
02146
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (DIFF INPUT)
0.01
0.1
1
MAX4063 toc12
OUTPUT VOLTAGE (VP-P)
THD+N (%)
35
BW = 22Hz TO 22kHz
f = 1kHz
f = 10kHz
10
0.001
02146
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (DIFF INPUT)
0.01
0.1
1
MAX4063 toc13
OUTPUT VOLTAGE (VP-P)
THD+N (%)
35
BW = 22Hz TO 22kHz
VCC = 5V
f = 1kHz
f = 10kHz
10
0.001
02146
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (AUX INPUT)
0.01
0.1
1
MAX4063 toc14
OUTPUT VOLTAGE (VP-P)
THD+N (%)
35
BW = 22Hz TO 22kHz
VCC = 5V
f = 1kHz
f = 10kHz
10
0.001
02146
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE (AUX INPUT)
0.01
0.1
1
MAX4063 toc15
OUTPUT VOLTAGE (VP-P)
THD+N (%)
35
BW = 22Hz TO 22kHz
VCC = 5V
f = 1kHz
f = 10kHz
MIC BIAS OUTPUT NOISE
MAX4063 toc17
100ms/div
20µV/div
VCC = 5V
BW = 22Hz TO 22kHz
SMALL-SIGNAL TRANSIENT RESPONSE
FOR DIFF INPUT
MAX4063 toc18
10µs/div
DIFF
INPUT
5mV/div
DIFF
OUTPUT
50mV/div
MAX4063 toc16
FREQUENCY (Hz)
INPUT-REFERRED NOISE (nV/√Hz)
10k1k100
50
100
150
200
250
300
350
400
0
10 100k
INPUT-REFERRED NOISE
vs. FREQUENCY (DIFF INPUT)
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
6 _______________________________________________________________________________________
SMALL-SIGNAL TRANSIENT RESPONSE
FOR AUX INPUT
MAX4063 toc19
10µs/div
S/E
INPUT
5mV/div
DIFF
OUTPUT
100mV/div
LARGE-SIGNAL TRANSIENT RESPONSE
FOR DIFF INPUT
MAX4063 toc20
10µs/div
DIFF
INPUT
100mV/div
DIFF
OUTPUT
2V/div
OUTPUT OVERDRIVEN
MAX4063 toc22
10µs/div
DIFF
INPUT
500mV/div
DIFF
OUTPUT
2V/div
LARGE-SIGNAL TRANSIENT RESPONSE
FOR AUX INPUT
MAX4063 toc21
10µs/div
S/E
INPUT
100mV/div
DIFF
OUTPUT
2V/div
Typical Operating Characteristics (continued)
(VCC = 3V, AV= 20V/V, RL≥100kΩto 1.5V, VSHDN = VCC, VOUT is measured between OUT and OUT. TA= +25°C, unless otherwise
noted.)
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
_______________________________________________________________________________________ 7
Detailed Description
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.
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
external components. The MAX4063 has a complemen-
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).
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-
PIN
TSSOP TQFN NAME FUNCTION
115 G2
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).
216INT/AUX Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select
differential in or high to select auxiliary in.
31SHDN Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown
mode.
4 2 OUT Amplifier Output. OUT is high impedance when in shutdown mode.
5 3 BIAS External Electret Microphone Capsule Bias Output. Bypass BIAS with a 1µF capacitor to
ground.
64V
CC Power Supply. Bypass the VCC to GND with a 0.1µF capacitor.
7 5 ADJ Adjustable Gain Select for AUX_IN (see Auxiliary Input-Gain Adjustment section). Connect
a 10pF capacitor between OUT and ADJ.
87OUT Complementary Amplifier Output. OUT is high impedance in shutdown mode.
9 9 IN+ Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+.
10 10 IN- Inverting Differential Amplifier Input. AC-couple the audio signal into IN-.
11 11 GND Ground
12 12 AUX_IN Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into AUX_IN.
13 6, 8, 14 N.C. No Connection. Not internally connected.
14 13 G1 Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for
the differential amplifier.
—— 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.
Pin Description
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
8 _______________________________________________________________________________________
book PCs or PDAs. Used correctly, the advantages
over a single-ended solution are:
• Better power-supply noise rejection.
• Less degradation from noise in PC board ground
planes.
• The microphone and preamplifier may be placed
physically further apart, easing PC board layout
restrictions.
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
(RG) connected between the G1 and G2 pins:
where AVis the required voltage gain.
Hence, an 11.11kΩresistor yields a gain of 20V/V, or
26dB. Leaving the pins unconnected results in a gain of
2V/V. Gain is defined as:
For differential out:
The resistor can be either fixed or variable, allowing the
use of a digitally controlled potentiometer to alter the
gain under software control.
Auxiliary Input-Gain Adjustment
The MAX4063 provides an option to increase the
AUX_IN (see Figure 3). To increase the gain, connect
resistor RADJ between the ADJ and AUX_IN pins. RADJ is
calculated from the following formula:
R2M
AV
ADJ
AUX
=−
Ω
20 ()to increase the gain
AV
V
VD OUT OUT
IN+ IN-
=−
−
V
V
R200k
A
GVD
=−
Ω
2
BIAS
BIAS
AUX_IN
12
IN-
IN+
10
9
6
VCC
2.4V TO 5.5V
MAX4063
2INT/AUX
8OUT
OUT
ADJ
4
7
GND
11
SHDN
SHDN
VCC
3
BIAS
5
VBIAS
G2
G1
1
14
RG
Functional Diagram
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
_______________________________________________________________________________________ 9
where:
RADJ is placed between AUX_IN and ADJ.
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:
CIN = 1 / (2πfCUTRIN)
This assumes a low source impedance is driving the
inputs.
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
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-
ential inputs and to set the lower 3dB point (fCUT) of the
amplifier by sizing the output capacitor appropriately.
The input impedance matching on the differential input
is typically 1%, allowing input capacitor matching to be
effective at improving low-frequency PSRR.
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
VIN as an AC signal:
CMRR(dB) = ADM / ACM
where ADM is the differential gain, ACM is the common-
mode gain.
Input voltages should be sufficiently small such that the
output is not clipped in either differential or common-
AV V
V
AUX OUT OUT
AUX_IN
=−V
Figure 1. MAX4063 with Auxiliary Input Configuration
ADJ 7
AUX_IN
12
5
IN-
IN+
10
9
6
VCC
2.4V TO 5.5V
MAX4063
2
INT/AUX
8OUT
OUT 4
GND
11
SHDN
VBIAS
SHDN
VCC
3
G2
G1
BIAS
1
14
RBIAS
CBIAS
100kΩ
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
10 ______________________________________________________________________________________
mode application. The topology used in the MAX4063
means that the CMRR actually improves at higher dif-
ferential gains—another advantage of using differential
sensing.
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.
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).
Output
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.
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).
Applications Information
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.
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.
IN-
IN+
BIAS
10
9
5
3
AUX_IN
MICROPHONE
INPUT 12
6
VBIAS
SHDN SHDN
VCC
VCC
2.4V TO 5.5V
MAX4063 INT/AUX 2
OUT 8
OUT 4
ADJ 7
GND
11
1
14
G1 G2
Figure 2. MAX4063 Used for Biasing a Microphone
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
______________________________________________________________________________________ 11
2.2kΩ
2.2kΩ
AUX_IN12
IN-
IN+
10
9
6
VCC
VCC
2.4V TO 5.5V
MAX4063
INT/AUX 2
OUT 8
OUT 4
GND
11
SHDN SHDN 3
G2
G1
1µF
0.1µF
0.1µF
1µF
1
14
RADJ
10pF
RG
11kΩ
BIAS5VBIAS
0.1µF
ADJ 7
Figure 3. MAX4063 Used to Bias a Microphone Connected to the Auxiliary Input and the Differential Input
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
12 ______________________________________________________________________________________
AUX_IN
12
IN-
IN+
10
9
6
VCC
VCC
2.4V TO 5.5V
MAX4063
INT/AUX 2
OUT 8
OUT
10pF
1µF
0.1µF
0.1µF
ADJ
4
7
ADC
GND
11
SHDN
SHDN
3
G2
G1
1
14
BIAS
1kΩ
11.1kΩ
1kΩ
1kΩ
1kΩ
5
2.2µF
2.2µF
VBIAS
VCC
1µF
1µF
Figure 4. Using the MAX4063 with Differential Input/Differential Output Configuration
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
______________________________________________________________________________________ 13
Pin Configurations (continued)
Simplified Block Diagram
IN-
1
2
3
4
12
11
10
SHDN
OUT
BIAS
AUX_IN
VCC
GND
IN+
EP*
*CONNECT EP TO GND.
9
TQFN
MAX4063
G1
N.C.
G2
INT/AUX
5678
16
+
15 14 13
N.C.
OUT
N.C.
ADJ
TOP VIEW
IN-
IN+
BIAS
10
9
5
3
AUX_IN
12
6
VBIAS
SHDN
VCC
2.4V TO 5.5V
MAX4063
2
INT/AUX
8OUT
OUT 4
ADJ 7
GND
11
1
14
G1 G2
SHDN
Chip Information
PROCESS: BiCMOS
Package Information
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.
PACKAGE
TYPE
PACKAGE
CODE OUTLINE NO. LAND
PATTERN NO.
14 SSOP U14+1 21-0066 90-0113
16 TQFN T1644+4 21-0139 90-0070
MAX4063
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
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.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 1/03 Initial release —
1 6/11 Added EP information to Pin Description, updated power dissipation ratings,
updated Ordering Information and Pin Configuration for lead-free parts 1, 2, 7, 13
