MAX4062EUB [MAXIM]
Differential Microphone Preamplifiers 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闭
| 型号： | MAX4062EUB |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown |
| 文件： | 总17页 (文件大小：442K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2408; Rev 1; 1/03
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
General Description
Features
o 2.4V to 5.5V Single-Supply Operation
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.
o Adjustable Gain or Fixed-Gain Options
o High PSRR (86dB at 1kHz)
o High CMRR (70dB at 1kHz)
o Low Input-Referred Noise
o Integrated Microphone Bias
o 750µA Supply Current
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.
o 0.3µA Shutdown Current
o
4kV ꢀSꢁ Protection (AꢂUXIN)
o Rail-to-Rail® Outputs
o THꢁ+N: 0.04% at 1kHz
o Available in Space-Saving Packages
8-Pin Thin QFN (MAU4060/MAU4061)
8-Pin µMAU (MAU4060/MAU4061)
10-Pin µMAU (MAU4062)
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.
Typical Operating Circuit
2.4V TO 5.5V
4
Applications
USB Audio Peripherals
BIAS
Notebook Audio
Systems
V
CC
AES-42-Compliant
Microphones
Tablet PCs
MAX4060
PDA Audio Systems
Signal Conditioning
AUX_IN
8
x10
INT/AUX
1
Ordering Information
BIAS
TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
OUT
2
PART
5
IN+
IN-
MAX4060ETA
MAX4060EUA
MAX4061ETA
MAX4061EUA
MAX4062EUB
-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
8 Thin QFN-EP*
8 µMAX
ABY
—
x10
V
8 Thin QFN-EP*
8 µMAX
ABZ
—
6
BIAS
3
BIAS
10 µMAX
—
BIAS
*EP = Exposed paddle.
GND
7
Pin Configurations and Selector Guide appear at end of
data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 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 Preamplifiers with
Internal Bias and Complete Shutdown
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
to GND). .................................-0.3V to +6V
10-Pin µMAX (derate 5.6ꢀW/°C above +70°C) .........444ꢀW
Operating Teꢀperature Range ...........................-40°C to +85°C
Junction Teꢀperature......................................................+150°C
Storage Teꢀperature Range.............................-65°C to +150°C
Lead Teꢀperature (soldering, 10s) .................................+300°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) ................................ 10ꢀA
Continuous Power Dissipation (T = +70°C)
A
8-Pin Thin QFN (derate 4.7ꢀW/°C above +70°C) ......379ꢀW
8-Pin µMAX (derate 4.1ꢀW/°C above +70°C)............330ꢀW
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
= 3V for MAX4061/MAX4062, V
= 5V for MAX4060, GND = 0V, SHDN = V , INT/AUX = 0V, R = 11.11kΩ,
CC CC G
CC
R = 100kΩ to 1.5V, R
L
= ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 2)
MAX A
BIAS
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MAX4061/MAX4062
MAX4060
MIN
2.4
TYP
MAX
5.5
UNITS
Inferred froꢀ
PSRR test
Supply Voltage Range
V
V
CC
CC
4.5
5.5
Supply Current
I
0.75
1.5
1
1.2
ꢀA
V
Output Coꢀꢀon-Mode Voltage
Slew Rate
V
1.25
1.75
OCM
SR
A = 10V/V
V
V/µs
µA
Supply Current in Shutdown
I
V
= 0V, MAX4061
SHDN
0.001
30
1
SHDN
To GND
To V
Output Short-Circuit Current
I
ꢀA
SC
30
CC
DIFFERENTIAL INPUT (INT/AUX = 0V for MAX4060/MAX4062, default for MAX4061)
Input Offset Voltage
V
0.1
5
2
ꢀV
V
OS
Coꢀꢀon-Mode Input Voltage
Range
V
1
CM
Maxiꢀuꢀ Differential Input
Voltage
V
A = 1V/V, MAX4061/MAX4062
V
1
V
DIFFMAX
Sꢀall-Signal Bandwidth
Input Resistance
BW
R
600
100
1
kHz
kΩ
%
-3dB
Either differential input
IN
Input Resistance Match
R
MATCH
A = 10V/V, f = 1kHz
V
100
Input Noise-Voltage Density
RMS Output Noise Voltage
e
nV/√Hz
n
A = 100V/V, f = 1kHz, MAX4061/MAX4062
V
only
20
V
A = 10V/V, BW = 22Hz to 22kHz
V
125
µV
RMS
NRMS
2
_______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(V
= 3V for MAX4061/MAX4062, V
= 5V for MAX4060, GND = 0V, SHDN = V , INT/AUX = 0V, R = 11.11kΩ,
CC CC G
CC
R = 100kΩ to 1.5V, R
L
= ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 2)
MAX A
BIAS
A
MIN
PARAMETER
SYMBOL
CONDITIONS
= 0.7V
MIN
TYP
MAX
UNITS
Total Harꢀonic Distortion
Plus Noise
A = 10V/V, f = 1kHz, V
,
RMS
V
OUT
THD+N
0.04
%
BW = 22Hz to 22kHz
R
R
R
= open
1
1.13
10
1.3
10.4
104
10.4
G
G
G
1V < V
< 2V,
CM
V
= 0.7V
,
= 11.11kΩ
= 1.01kΩ
9.6
96
9.6
OUT
MAX4061/MAX4062
RMS
Differential Gain
A
V/V
VDIFF
100
10.0
70
1V < V < 2V, V
= 0.7V
, MAX4060
CM
OUT
RMS
Coꢀꢀon-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
V
= 500ꢀV , f = 1kHz
dB
dB
CM
P-P
T
T
= +25°C
72
60
89
A
A
= T
to T
MAX
MIN
V
= 5V 100ꢀV, f = 1kHz
86
CC
AUXILIARY INPUT (MAX4060/MAX4062, INT/AUX = V
)
CC
Sꢀall-Signal Bandwidth
Input Resistance
BW
R
200
100
45
kHz
kΩ
-3dB
IN
Input Noise-Voltage Density
RMS Output Noise Voltage
e
f = 1kHz
nV/√Hz
n
V
BW = 22Hz to 22kHz
385
µV
RMS
NRMS
Total Harꢀonic Distortion
Plus Noise
THD+N
PSRR
f = 1kHz, BW = 22Hz to 22kHz
0.05
90
%
T
T
= +25°C
65
50
A
A
Power-Supply Rejection Ratio
dB
= T
- T
MIN
MAX
Voltage Gain
A
V
= 0.7V
-10.7
-10
-9.3
40
V/V
VAUX
OUT
RMS
BIAS OUTPUT (MAX4060/MAX4062)
I
I
I
I
= 0.8ꢀA to GND, MAX4060
= 0.5ꢀA to GND, MAX4062
= 0.8ꢀA to GND, MAX4060
= 0.5ꢀA to GND, MAX4062
2
2
2
2.2
2.2
2.5
22
BIAS
BIAS
BIAS
BIAS
Output Voltage
V
V
OUT
OUT
kΩ
Output Resistance
R
Ω
I
= 0.8ꢀA to GND, BW = 22Hz to
BIAS
50
20
22kHz, MAX4060
Output Noise Voltage
V
µV
RMS
NRMS
I
= 0.5ꢀA to GND, BW = 22Hz to
BIAS
22kHz, MAX4062
_______________________________________________________________________________________
3
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(V
= 3V for MAX4061/MAX4062, V
= 5V for MAX4060, GND = 0V, SHDN = V , INT/AUX = 0V, R = 11.11kΩ,
CC CC G
CC
R = 100kΩ to 1.5V, R
L
= ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 2)
MAX A
BIAS
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
V
= 0.8ꢀA to GND,
= 4.5V to 5.5V
BIAS
50
80
CC
MAX4060
MAX4062
I
= 0.8ꢀA, V
= 5V
CC
BIAS
70
74
71
+ 100ꢀV , f = 1kHz
P-P
Power-Supply Rejection Ratio
PSRR
dB
I
V
= 0.5ꢀA to GND,
= 2.4V to 5.5V
BIAS
50
CC
I
= 0.5ꢀA, V
= 3V
CC
BIAS
+ 100ꢀV , f = 1kHz
P-P
DIGITAL INPUTS (SHD N for MAX4061 and INT/AUX for MAX4060/MAX4062)
Input Leakage Current
I
V
= 0V or V
CC
1
µA
V
IN
IN
✿
0.7
V
Input Voltage High
V
INH
CC
✿
0.3
Input Voltage Low
V
V
INL
V
CC
Shutdown Enable Tiꢀe
Shutdown Disable Tiꢀe
t
MAX4061
MAX4061
10
10
µs
µs
ON
t
OFF
Note 1: All specifications are 100% tested at T = +25°C. Specification liꢀits over teꢀperature (T = T
to T
) are guaranteed
MAX
A
A
MIN
by design, not production tested.
Note 2: MAX4062 requires a 1µF capacitor froꢀ BIAS to ground.
4
_______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics
(V
= 3V (MAX4061/MAX4062), V
= +25°C, unless otherwise noted.)
= 5V for MAX4060, A = 10V/V, R ≥ 100kΩ to 1.5V, SHDN = V
(MAX4061 only),
CC
CC
CC
V
L
T
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
CC
3
0
V
= 5V
CC
-40
V
= 3V
CC
-3
-60
A
= 10V/V
V
-6
-80
-9
-100
-120
-12
-15
A
= 100V/V
100k
V
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
SUPPLY CURRENT vs. SUPPLY VOLTAGE
V
vs. TEMPERATURE
OH
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
100
10
1000
100
10
V
= V - V
CC
OH
OUT
I
= 2.5mA
LOAD
1
0.1
0.01
0.001
A
= 10V/V
V
I
= 50µA
LOAD
NO LOAD
1
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
V
vs. LOAD CURRENT
V
vs. LOAD CURRENT
OL
V
vs. TEMPERATURE
OH
OL
175
150
125
100
75
300
250
200
150
100
50
1000
100
10
V
= V - V
CC OUT
OH
V = 3V
CC
I
= 2.5mA
LOAD
V
= 3V
CC
50
25
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)
_______________________________________________________________________________________
5
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics (continued)
(V
= 3V (MAX4061/MAX4062), V
= +25°C, unless otherwise noted.)
= 5V for MAX4060, A = 10V/V, R ≥ 100kΩ to 1.5V, SHDN = V
(MAX4061 only),
CC
CC
CC
V
L
T
A
MAX4060
MIC BIAS VOLTAGE vs. TEMPERATURE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (DIFF INPUT)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (AUX INPUT)
2.300
2.275
2.250
2.225
2.200
2.175
2.150
2.125
2.100
1
1
V
= 2.26V
P-P
V
= 2.26V
P-P
OUT
I
= 800µA
OUT
BIAS
V
= 3V
CC
V
V
= 3V
CC
0.1
0.1
V
= 5V
= 5V
CC
CC
0.01
0.001
0.01
0.001
-40
-15
10
35
60
85
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
TEMPERATURE (°C)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
(DIFF INPUT, V = 5V)
(AUX INPUT, V = 3V)
(DIFF INPUT, V = 3V)
CC
CC
CC
10
10
10
BW = 22kHz
BW = 22kHz
BW = 22kHz
f = 1kHz
1
0.1
1
1
0.1
f = 1kHz
0.1
f = 1kHz
f = 10kHz
f = 10kHz
f = 10kHz
0.01
0.001
0.01
0.001
0.01
0.001
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT VOLTAGE (V
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
)
OUTPUT VOLTAGE (V
)
P-P
OUTPUT VOLTAGE (V
)
P-P
P-P
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
INPUT-REFERRED NOISE
vs. FREQUENCY (DIFF INPUT)
MAX4060
MIC BIAS OUTPUT NOISE
(AUX INPUT, V = 5V)
CC
MAX4060 toc18
800
700
600
500
400
300
200
100
0
10
BW = 22kHz
V
= 5V
CC
BW = 22Hz TO 22kHz
1
f = 1kHz
0.1
5µV/div
f = 10kHz
0.01
0.001
10
100
1k
10k
100k
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT VOLTAGE (V
100ms/div
FREQUENCY (Hz)
)
P-P
6
_______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics (continued)
(V
= 3V (MAX4061/MAX4062), V
= +25°C, unless otherwise noted.)
= 5V for MAX4060, A = 10V/V, R ≥ 100kΩ to 1.5V, SHDN = V (MAX4061 only),
CC
CC
CC
V
L
T
A
MAX4062
MIC BIAS OUTPUT NOISE
SMALL-SIGNAL TRANSIENT RESPONSE
FOR DIFF INPUT
MAX4060 toc19
MAX4060 toc20
V
= 5V
CC
BW = 22Hz TO 22kHz
INPUT
5mV/div
5µV/div
OUTPUT
50mV/div
100ms/div
10µs/div
LARGE-SIGNAL TRANSIENT RESPONSE
SMALL-SIGNAL TRANSIENT RESPONSE
FOR DIFF INPUT
FOR AUX INPUT
MAX4060 toc22
MAX4060 toc21
INPUT
100mV/div
INPUT
5mV/div
OUTPUT
1V/div
OUTPUT
50mV/div
10 s/div
10µs/div
LARGE-SIGNAL TRANSIENT RESPONSE
FOR AUX INPUT
OUTPUT OVERDRIVEN
MAX4060 toc23
MAX4060 toc24
INPUT
200mV/div
DIFFERENTIAL INPUT
INPUT
500mV/div
OUTPUT
1V/div
OUTPUT
1V/div
10µs/div
10µs/div
_______________________________________________________________________________________
7
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Pin Description
PIN
NAME
FUNCTION
MAX4060 MAX4061 MAX4062
Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low
to select internal or high to select auxiliary ꢀicrophone input.
1
2
3
4
—
3
2
3
INT/AUX
OUT
Aꢀplifier Output. OUT is high iꢀpedance when in shutdown ꢀode.
External Electret Microphone Capsule Bias Output. BIAS has a greater than
2k output iꢀpedance.
—
—
BIAS
4
5
V
Power Supply. Bypass the V
to GND with a 0.1µF capacitor.
CC
CC
5
6
7
5
6
7
6
7
8
IN+
IN-
Noninverting Differential Aꢀplifier Input. AC-couple the audio signal into IN+.
Inverting Differential Aꢀplifier Input. AC-couple the audio signal into IN-.
Ground
GND
Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into
AUX_IN.
8
—
9
AUX_IN
Gain-Selectable Input. Connect an external resistor between G1 and G2 to set
the gain for the differential aꢀplifier. (See Adjustable Differential-Gain Setting
section.)
—
1
1
G2
Shutdown Input. Drive SHDN high for norꢀal operation. Drive SHDN low for
shutdown ꢀode.
—
—
—
2
—
8
—
4
SHDN
BIAS
G1
External Electret Microphone Capsule Bias Output Bypass BIAS with 1µF
Capacitor to Ground
Gain-Selectable Input. Connect an external resistor between G1 and G2 to set
the gain for the differential aꢀplifier.
10
0.3µA shutdown ꢀode for ultiꢀate power savings. The
Detailed Description
differential gain of the MAX4061/MAX4062 is set with a
single resistor connected between the G1 and G2 pins.
The MAX4060 has a fixed gain of 10V/V.
The MAX4060/MAX4061/MAX4062 are differential ꢀicro-
phone preaꢀplifiers providing high-quality audio, opti-
ꢀized for use in coꢀputer and ꢀobile applications.
These devices feature rail-to-rail outputs, very high
power-supply rejection, and coꢀꢀon-ꢀode rejection,
ꢀaking theꢀ ideal for low-noise applications. The
MAX4060/MAX4061/MAX4062 are particularly effective
when layout constraints force the ꢀicrophone aꢀplifier to
be physically reꢀote froꢀ the ECM ꢀicrophone and/or
the rest of the audio circuitry.
Differential Input
The ꢀain ꢀicrophone input is a low-noise, differential
input structure. This is an alꢀost essential eleꢀent
when faced with aꢀplification of low-aꢀplitude analog
signals in digitally intense environꢀents such as note-
book PCs or PDAs. Used correctly, the advantages
over a single-ended solution are:
The MAX4060/MAX4062 are capable of switching their
output between the differential input and an inverting
single-ended input. INT/AUX selects either the differen-
tial input or single-ended auxiliary input. In addition, the
MAX4060/MAX4061 have an internal bias generator to
bias the ꢀicrophone in either differential or single-
ended ꢀodes. The MAX4061 includes a coꢀplete
•
•
Better power-supply noise rejection.
Less degradation froꢀ noise in PC board ground
planes.
•
The ꢀicrophone and preaꢀplifier can be placed
physically further apart, easing PC board layout
restrictions.
8
_______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Functional Diagram
2.4V TO 5.5V
BIAS
4
V
CC
MAX4060
AUX_IN
8
x10
1
2
INT/AUX
BIAS
OUT
5
IN+
IN-
x10
V
6
BIAS
3
BIAS
BIAS
GND
7
Fixed Differential Gain (MAX4060)
The MAX4060 has an internal fixed gain of 10V/V for its
differential input. This feature siꢀplifies design, reduces
pin count, footprint, and eliꢀinates external gain-setting
resistors.
Input Capacitors
The two differential ꢀicrophone inputs and the single-
ended auxiliary input of the MAX4060/MAX4061/
MAX4062 have on-chip bias coꢀponents, allowing the
user to AC-couple any signals onto the input. The input
resistance is 100kΩ (typ), so the capacitor size ꢀay be
chosen accordingly to define the LF rolloff desired. This
can be calculated as:
Adjustable Differential-Gain Setting
The MAX4061/MAX4062 allow the user to alter the gain
to optiꢀize the signal-to-noise ratio (SNR) of their sys-
teꢀ. The gain is set by a single external resistor (R )
G
connected between the G1 and G2 pins, where:
C
IN
= 1 / (2πf
R )
CUT IN
R
G
= 100kΩ / (A - 1)
V
This assuꢀes a low source iꢀpedance driving the inputs.
A further consideration for the differential input is the
effect of these series input capacitors on low-frequency,
coꢀꢀon-ꢀode rejection. Any ꢀisꢀatch in the values of
these two capacitors degrades the CMRR at frequen-
cies where the iꢀpedance of the capacitor is significant
coꢀpared to the input resistance of the aꢀplifier—this is
usually ꢀost noticeable at low frequencies. One way to
avoid the need for ꢀatched or tight tolerance capaci-
tors is to deliberately oversize the values on the differ-
where A is the required voltage gain.
V
Hence, an 11.11kΩ resistor yields a gain of 10V/V, or
20dB. Leaving the pins unconnected results in a gain
of 1V/V. Gain for the MAX4061/MAX4062 is defined as:
A = V
/ (V
- V
)
IN-
V
OUT
IN+
The resistor can be either fixed or variable, allowing the
use of a digitally controlled potentioꢀeter to alter the
gain under software control.
_______________________________________________________________________________________
9
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
2.4V TO 5.5V
5
V
CC
100kΩ
R
BIAS
BIAS
4
V
BIAS
C
BIAS
MAX4062
9
AUX_IN
x10
2
INT/AUX
3
OUT
6
7
IN+
IN-
G1 10
G2
1
GND
8
Figure 1. MAX4062 with Auxiliary Input Configuration
ential inputs and to set the lower 3dB point (f
) of the
Auxiliary Input
CUT
aꢀplifier by sizing the output capacitor appropriately.
The auxiliary input is a single-ended input intended to
be used with a jack-socket-type ꢀicrophone input
(Figure 1). Internal DC-bias coꢀponents (as on the
ꢀain 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 ꢀicrophone input to be autoꢀatically selected
when a jack socket is inserted.
The input iꢀpedance ꢀatching on the differential input
is typically 1%, allowing input capacitor ꢀatching to be
effective at iꢀproving low-frequency PSRR.
Common-Mode Rejection Ratio
The coꢀꢀon-ꢀode rejection ratio (CMRR) refers to the
aꢀount of rejection that the aꢀplifier is capable of pro-
viding to any signal applied equally to the IN+ and IN-
inputs. In the case of aꢀplifying low-level ꢀicrophone
signals in noisy digital environꢀents, it is a key figure of
ꢀerit. In audio circuits, this is generally ꢀeasured for
Microphone Bias Voltage
MAX4060
The MAX4060 has a ꢀicrophone bias voltage designed
to coꢀply with the Microsoft/Intel PC99/2001 audio
standard. It features source iꢀpedance of greater than
2kΩ, and delivers ꢀore than 2V of bias when loaded
with a current of 800µA. This liꢀits operation of this part
to supplies between 4.5V to 5.5V (see Figure 2).
V
IN
as an AC signal:
CMRR(dB) = A
/ A
DM
CM
where A
is the differential gain, A
is the coꢀꢀon-
DM
ꢀode gain.
CM
Input voltages are sufficiently sꢀall such that the output
is not clipped in either differential or coꢀꢀon-ꢀode
application. The topology used in the MAX4061/
MAX4062 ꢀeans that the CMRR actually iꢀproves at
higher differential gains—another advantage of using
differential sensing.
10 ______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
4.5V TO 5.5V
4
V
CC
MAX4060
MICROPHONE
INPUT
8
AUX_IN
BIAS
x10
INT/AUX
1
2
3
V
BIAS
R
BIAS
OUT
5
6
IN+
IN-
x10
GND
7
Figure 2. MAX4060 Used for Biasing a Microphone
MAX4061/MAX4062
The MAX4061/MAX4062 have a lower bias voltage and
low-iꢀpedance outputs (optiꢀuꢀ electret bias resistor
can then be set externally). This gives a low-noise, flexi-
ble solution that can run froꢀ 2.4V to 5.5V, suitable for
hand-held devices such as PDAs that typically have
audio power supplies in the 3V region (see Figure 3).
Applications Information
Shutdown Mode
The MAX4061 features a low-power, coꢀplete shut-
down ꢀode. When SHDN goes low, the supply current
drops to 0.3µA, the output enters a high-iꢀpedance
state, and the bias current to the ꢀicrophone is
switched off. Driving SHDN high enables the aꢀplifier.
SHDN should not be left floating.
In applications where the differential ꢀicrophone is
placed soꢀe distance froꢀ the MAX4060/MAX4061/
MAX4062, using a reꢀote differential bias scheꢀe as
shown in Figure 4 can provide iꢀproved noise rejection.
Power Supplies and Layout
The MAX4060 operates froꢀ a 4.5V to 5.5V single sup-
ply and the MAX4061/MAX4062 operate froꢀ a 2.4V to
5.5V single supply. Bypass the power supply with a
0.1µF capacitor to ground. In systeꢀs where analog
and digital grounds are available, the MAX4060/
MAX4061 should be connected to the analog ground.
Output
MAX4060/MAX4061 DC Bias
The output voltage has a DC-bias voltage independent
of the power supplies, resulting in superior PSRR per-
forꢀance. The MAX4061 output is high iꢀpedance
when the part is in shutdown ꢀode. AC-coupling the
output into the next audio stage (e.g., CODEC) is rec-
oꢀꢀended.
______________________________________________________________________________________ 11
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
2.4V TO 5.5V
5
V
CC
4
BIAS
V
BIAS
MAX4062
0.1µF
0.1µF
9
AUX_IN
x10
2
INT/AUX
OUT
2.2kΩ
10 G1
R
G
11kΩ
3
1
6
G2
2.2kΩ
0.1µF
IN+
7
IN-
0.1µF
GND
8
Figure 3. MAX4062 Used to Bias a Microphone Connected to the Auxiliary Input and the Differential Input
12 ______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
2.4V TO 5.5V
5
V
CC
4
BIAS
V
BIAS
MAX4062
0.1µF
9
AUX_IN
x10
2.2kΩ
0.1µF
2
INT/AUX
OUT
V
10 G1
DD
1kΩ
R
G
11kΩ
3
1
6
G2
1kΩ
2.2µF
0.1µF
IN+
7
IN-
0.1µF
1kΩ
1kΩ
GND
8
2.2µF
Figure 4. Remote Differential Microphone Bias Network Optimizes Noise Rejection in Long-Run, PC Board Traces
Pin Configurations
TOP VIEW
INT/AUX
1
2
3
4
8
7
6
5
AUX_IN
GND
IN-
G2
SHDN
OUT
1
2
3
4
8
7
6
5
G1
G2
INT/AUX
OUT
1
2
3
4
5
10 G1
OUT
GND
IN-
MAX4060
MAX4061
9
8
7
6
AUX_IN
BIAS
MAX4062
GND
IN-
V
IN+
V
IN+
CC
CC
BIAS
µMAX/THIN QFN
µMAX/THIN QFN
V
IN+
CC
µMAX
______________________________________________________________________________________ 13
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Block Diagrams
4.5V TO 5.5V
4
2.4V TO 5.5V
5
V
CC
V
2.4V TO 5.5V
4
CC
MAX4060
MAX4062
V
CC
8
3
AUX_IN
BIAS
8
AUX_IN
BIAS
x10
x10
MAX4061
2
INT/AUX
SHDN
IN+
2
5
INT/AUX
1
4
V
BIAS
V
BIAS
3
OUT
OUT
2
3
OUT
5
6
IN+
IN-
6
7
IN+
IN-
6
IN-
x10
GND
7
G1
G2
1
8
GND
7
G1
10
G2
1
GND
8
Selector Guide
SINGLE-ENDED
INPUT
SUPPLY
VOLTAGE
(V)
AUXILIARY
INPUT
DIFF INPUT
GAIN
MICROPHONE
BIAS
SHUTDOWN
MODE
PRODUCT*
GAIN (dB)
MAX4060
MAX4061
MAX4062
✔
—
✔
20dB
ADJ
ADJ
20
—
20
✔
—
✔
—
✔
4.5 to 5.5
2.4 to 5.5
2.4 to 5.5
—
*See Block Diagrams.
Chip Information
TRANSISTOR COUNT: 264
PROCESS: BiCMOS
14 ______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Package Information
(The package drawing(s) in this data sheet ꢀay not reflect the ꢀost current specifications. For the latest package outline inforꢀation,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 6, 8 & 10L,
QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
A
D
E
A1
L
0.80
3.10
3.10
0.05
0.40
k
0.25 MIN
0
A20.2 REF.
PACKAGE VARIATIONS
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
MO229 / WEEA
MO229 / WEEC
b
[(N/2)-1] x e
1.90 REF
1.95 REF
2.00 REF
1.50 0.10 2.30 0.10 0.95 BSC
1.50 0.10 2.30 0.10 0.65 BSC
0.40 0.05
0.30 0.05
T833-1
8
T1033-1
10
1.50 0.10 2.30 0.10 0.50 BSC MO229 / WEED-3 0.25 0.05
PACKAGE OUTLINE, 6, 8 & 10L,
QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
______________________________________________________________________________________ 15
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Package Information (continued)
(The package drawing(s) in this data sheet ꢀay not reflect the ꢀost current specifications. For the latest package outline inforꢀation,
go to www.maxim-ic.com/packages.)
4X S
8
8
MILLIMETERS
INCHES
DIM MIN
MAX
MAX
MIN
-
-
0.043
0.006
0.037
0.014
0.007
0.120
1.10
0.15
0.95
0.36
0.18
3.05
A
0.002
0.030
0.010
0.005
0.116
0.05
0.75
0.25
0.13
2.95
A1
A2
b
E
H
ÿ 0.50 0.1
c
D
e
0.0256 BSC
0.65 BSC
0.6 0.1
E
H
0.116
0.188
0.016
0∞
0.120
2.95
4.78
0.41
0∞
3.05
5.03
0.66
6∞
0.198
0.026
6∞
L
1
1
α
S
0.6 0.1
0.0207 BSC
0.5250 BSC
D
BOTTOM VIEW
TOP VIEW
A1
A2
A
c
α
e
L
b
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0036
J
1
16 ______________________________________________________________________________________
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Package Information (continued)
(The package drawing(s) in this data sheet ꢀay not reflect the ꢀost current specifications. For the latest package outline inforꢀation,
go to www.maxim-ic.com/packages.)
e
4X S
10
10
INCHES
DIM MIN
MAX
MILLIMETERS
MIN
-
MAX
1.10
0.15
A
-
0.043
0.006
A1
0.002
0.05
A20.030
0.037
0.75
0.95
D1
D2
E1
E2
H
0.116
0.120
0.118
0.120
0.118
0.199
2.95
2.89
2.95
2.89
4.75
0.40
3.05
3.00
3.05
3.00
5.05
0.70
0.114
0.116
0.114
0.187
H
ÿ 0.50 0.1
0.6 0.1
L
0.0157 0.0275
0.037 REF
L1
b
0.940 REF
0.177 0.270
0.500 BSC
0.090 0.200
0.498 REF
0∞ 6∞
0.007
0.0106
1
1
e
0.0197 BSC
0.6 0.1
c
0.0035 0.0078
0.0196 REF
0∞
BOTTOM VIEW
S
α
TOP VIEW
6∞
D2
E2
GAGE PLANE
A2
c
A
E1
b
L
α
A1
D1
L1
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0061
I
1
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17
© 2003 Maxiꢀ Integrated Products
Printed USA
is a registered tradeꢀark of Maxiꢀ Integrated Products.
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