19-2408; Rev 2; 5/05
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
General Description
The MAX4060/MAX4061/MAX4062 are differential-input
microphone preamplifiers optimized for notebook and
PDA audio systems. These devices feature adjustable
gain with excellent power-supply rejection and com-
mon-mode rejection ratios, making them ideal for low-
noise applications in portable audio systems.
The MAX4060/MAX4062 are capable of switching their
output between the differential input and a single-
ended auxiliary microphone amplifier input. In addition,
the MAX4060/MAX4062 have a low-noise microphone
bias generator. The differential gain of the
MAX4061/MAX4062 is set with a single resistor. The
MAX4060 has a fixed gain of 10V/V and is PC99/2001
compliant. The MAX4061 includes a complete shut-
down mode. In shutdown, the supply current is
reduced to 0.3µA and the current to the microphone
bias is cut off for ultimate power savings.
The MAX4060 operates from a 4.5V to 5.5V single sup-
ply and the MAX4061/MAX4062 operate from 2.4V to
5.5V. All devices are specified over the extended oper-
ating temperature range, -40°C to +85°C. The
MAX4060/MAX4061 are available in tiny 8-pin thin QFN
(3mm x 3mm x 0.8mm) and 8-pin µMAX
®
packages.
The MAX4062 is available in a 10-pin µMAX package.
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Features
2.4V to 5.5V Single-Supply Operation
Adjustable Gain or Fixed-Gain Options
High PSRR (86dB at 1kHz)
High CMRR (70dB at 1kHz)
Low Input-Referred Noise
Integrated Microphone Bias
750µA Supply Current
0.3µA Shutdown Current
±4kV ESD Protection (AUX_IN)
Rail-to-Rail Outputs
THD+N: 0.04% at 1kHz
Available in Space-Saving Packages
8-Pin Thin QFN (MAX4060/MAX4061)
8-Pin µMAX (MAX4060/MAX4061)
10-Pin µMAX (MAX4062)
MAX4060/MAX4061/MAX4062
Typical Operating Circuit
2.4V TO 5.5V
BIAS
4
V
CC
Applications
Notebook Audio
Systems
Tablet PCs
PDA Audio Systems
USB Audio Peripherals
AES-42-Compliant
Microphones
Signal Conditioning
MAX4060
8 AUX_IN
x10
INT/AUX 1
Ordering Information
PART
MAX4060ETA
MAX4060EUA
MAX4061ETA
MAX4061EUA
MAX4062EUB
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 Thin QFN-EP*
8 µMAX
8 Thin QFN-EP*
8 µMAX
10 µMAX
TOP
MARK
ABY
—
ABZ
—
—
BIAS
OUT 2
5 IN+
x10
6 IN-
V
BIAS
GND
BIAS
3
BIAS
*EP = Exposed paddle.
Pin Configurations and Selector Guide appear at end of
data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
7
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 Preamplifiers with
Internal Bias and Complete Shutdown
MAX4060/MAX4061/MAX4062
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)
8-Pin Thin QFN (derate 4.7mW/°C above +70°C) ......379mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) .........444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°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 for MAX4061/MAX4062, V
CC
= 5V for MAX4060, GND = 0V,
SHDN
= V
CC
,
INT/AUX
= 0V, R
G
= 11.11kΩ,
R
L
= 100kΩ to 1.5V, R
BIAS
=
∞,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Supply Voltage Range
Supply Current
Output Common-Mode Voltage
Slew Rate
Supply Current in Shutdown
Output Short-Circuit Current
SYMBOL
V
CC
I
CC
V
OCM
SR
I
SHDN
I
SC
A
V
= 10V/V
V
SHDN
= 0V, MAX4061
To GND
To V
CC
1.25
Inferred from
PSRR test
CONDITIONS
MAX4061/MAX4062
MAX4060
MIN
2.4
4.5
0.75
1.5
±1
0.001
30
30
±0.1
1
A
V
= 1V/V, MAX4061/MAX4062
1
600
Either differential input
A
V
= 10V/V, f = 1kHz
Input Noise-Voltage Density
RMS Output Noise Voltage
e
n
V
NRMS
A
V
= 100V/V, f = 1kHz, MAX4061/MAX4062
only
A
V
= 10V/V, BW = 22Hz to 22kHz
100
1
100
nV/√Hz
20
125
µV
RMS
±5
2
1
TYP
MAX
5.5
5.5
1.2
1.75
UNITS
V
mA
V
V/µs
µA
mA
DIFFERENTIAL INPUT
(INT/AUX = 0V for MAX4060/MAX4062, default for MAX4061)
Input Offset Voltage
Common-Mode Input Voltage
Range
Maximum Differential Input
Voltage
Small-Signal Bandwidth
Input Resistance
Input Resistance Match
V
OS
V
CM
V
DIFFMAX
BW
-3dB
R
IN
R
MATCH
mV
V
V
kHz
kΩ
%
2
_______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3V for MAX4061/MAX4062, V
CC
= 5V for MAX4060, GND = 0V,
SHDN
= V
CC
,
INT/AUX
= 0V, R
G
= 11.11kΩ,
R
L
= 100kΩ to 1.5V, R
BIAS
=
∞,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Total Harmonic Distortion
Plus Noise
SYMBOL
THD+N
CONDITIONS
A
V
= 10V/V, f = 1kHz, V
OUT
= 0.7V
RMS
,
BW = 22Hz to 22kHz
1V < V
CM
< 2V,
VOUT = 0.7V
RMS
,
MAX4061/MAX4062
RG = open
RG = 11.11kΩ
RG = 1.01kΩ
1
9.6
96
9.6
72
60
86
200
100
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
I
BIAS
= 0.8mA to GND, MAX4060
I
BIAS
= 0.5mA to GND, MAX4062
I
BIAS
= 0.8mA to GND, MAX4060
(T
A
= +25°C)
I
BIAS
= 0.5mA to GND, MAX4062
(T
A
= +25°C)
I
BIAS
= 0.8mA to GND, BW = 22Hz to
22kHz, MAX4060
Output Noise Voltage
V
NRMS
I
BIAS
= 0.5mA to GND, BW = 22Hz to
22kHz, MAX4062
65
50
-10.7
2
2
2
-10
2.2
2.2
2.5
22
50
µV
RMS
20
40
-9.3
45
385
0.05
90
kHz
kΩ
nV/√Hz
µV
RMS
%
dB
V/V
MIN
TYP
0.04
1.13
10
100
10.0
70
89
dB
1.3
10.4
104
10.4
dB
V/V
MAX
UNITS
%
MAX4060/MAX4061/MAX4062
Differential Gain
A
VDIFF
1V < V
CM
< 2V, V
OUT
= 0.7V
RMS
, MAX4060
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
V
CM
= 500mV
P-P
, f = 1kHz
T
A
= +25°C
T
A
= T
MIN
to TMAX
V
CC
= 5V
±100mV,
f = 1kHz
AUXILIARY INPUT
(MAX4060/MAX4062, 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
(MAX4060/MAX4062)
Output Voltage
V
OUT
BW
-3dB
R
IN
en
V
NRMS
THD+N
PSRR
A
VAUX
V
kΩ
Ω
Output Resistance
R
OUT
_______________________________________________________________________________________
3
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
MAX4060/MAX4061/MAX4062
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3V for MAX4061/MAX4062, V
CC
= 5V for MAX4060, GND = 0V,
SHDN
= V
CC
,
INT/AUX
= 0V, R
G
= 11.11kΩ,
R
L
= 100kΩ to 1.5V, R
BIAS
=
∞,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
I
BIAS
= 0.8mA to GND,
V
CC
= 4.5V to 5.5V
I
BIAS
= 0.8mA, V
CC
= 5V
+ 100mV
P-P
, f = 1kHz
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
DIGITAL INPUTS
(
SHDN
for MAX4061 and
INT
/AUX for MAX4060/MAX4062)
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
MAX4061
MAX4061
10
10
V
IN
= 0V or V
CC
0.7 x
V
CC
0.3 x
V
CC
±1
µA
V
V
µs
µs
50
MIN
50
TYP
80
70
dB
74
71
MAX
UNITS
MAX4060
Power-Supply Rejection Ratio
PSRR
MAX4062
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:
MAX4062 requires a 1µF capacitor from BIAS to ground.
4
_______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics
(V
CC
= 3V (MAX4061/MAX4062), V
CC
= 5V for MAX4060, A
V
= 10V/V, R
L
≥
100kΩ to 1.5V,
SHDN
= V
CC
(MAX4061 only),
T
A
= +25°C, unless otherwise noted.)
GAIN vs. FREQUENCY
(NO LOAD)
MAX4060 toc01
MAX4060/MAX4061/MAX4062
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (DIFF INPUT)
MAX4060 toc02
SUPPLY CURRENT vs. TEMPERATURE
MAX4060 toc03
3
0
V
CC
= 5V
0
-20
-40
PSRR (dB)
1.0
0.8
SUPPLY CURRENT (mA)
V
CC
= 5V
V
CC
= 3V
GAIN (dB)
-3
-6
-9
-12
-15
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
0.6
-60
-80
-100
-120
10
A
V
= 10V/V
0.4
0.2
A
V
= 100V/V
0
100
1k
10k
100k
1M
-40 -25 -10
5
20
35
50
65
80
FREQUENCY (Hz)
TEMPERATURE (°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4060 toc04
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4060 toc05
OUTPUT-VOLTAGE HIGH
vs. TEMPERATURE
V
OH
= V
CC
- V
OUT
MAX4060 toc06
0.9
0.8
SUPPLY CURRENT (mA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
A
V
= 10V/V
NO LOAD
100
SHUTDOWN SUPPLY CURRENT (nA)
1000
10
I
LOAD
= 2.5mA
100
V
OH
(mV)
10
0.01
I
LOAD
= 50µA
0.001
1
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
1
0.1
5.5
SUPPLY VOLTAGE (V)
OUTPUT-VOLTAGE LOW
vs. TEMPERATURE
MAX4060 toc07
OUTPUT-VOLTAGE HIGH
vs. LOAD CURRENT
V
OH
= V
CC
- V
OUT
150
125
V
OH
(mV)
100
75
50
V
CC
= 3V
V
OL
(mV)
MAX4060 toc08
OUTPUT-VOLTAGE LOW
vs. LOAD CURRENT
MAX4060 toc09
1000
175
300
250
200
V
CC
= 3V
150
100
50
0
I
LOAD
= 2.5mA
100
V
OL
(mV)
10
I
LOAD
= 50µA
1
-40
-15
10
35
60
85
TEMPERATURE (°C)
25
0
0
1
2
3
4
5
LOAD CURRENT (mA)
0
1
2
3
4
5
LOAD CURRENT (mA)
_______________________________________________________________________________________
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