MAX4062EUB+ [MAXIM]
Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown;
| 型号： | MAX4062EUB+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 放大器 信息通信管理 光电二极管 商用集成电路 |
| 文件： | 总15页 (文件大小：1352K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Click here for production status of specific part numbers.
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
General Description
Features
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 common-
mode rejection ratios, making them ideal for lownoise
applications in portable audio systems.
● 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
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 shutdown 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.
● 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 TDFN (MAX4060/MAX4061)
• 8-Pin μMAX (MAX4060/MAX4061)
• 10-Pin μMAX (MAX4062)
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 operat-
ing temperature range, -40°C to +85°C. The MAX4060/
MAX4061 are available in tiny 8-pin TDFN (3mm x 3mm
Typical Operating Circuit
2.4V TO 5.5V
BIAS
®
x 0.8mm) and 8-pin μMAX packages. The MAX4062 is
available in a 10-pin μMAX package.
4
V
CC
Applications
MAX4060
INT/AUX
OUT
● Notebook Audio
● USB Audio Peripherals
Systems
● AES-42-Compliant
AUX_IN
8
x10
● Tablet PCs
● PDA Audio Systems
Microphones
● Signal Conditioning
1
Ordering Information
BIAS
TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
ABY
—
ABZ
—
PART
2
MAX4060ETA+
MAX4060EUA+
MAX4061ETA+
MAX4061EUA+
MAX4062EUB+
-40°C to +85°C 8 TDFN-EP*
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 TDFN-EP*
-40°C to +85°C 8 µMAX
-40°C to +85°C 10 µMAX
5
IN+
IN-
x10
6
BIAS
—
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
3
BIAS
V
BIAS
GND
7
Pin Configurations and Selector Guide appear at end of
data sheet.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
19-2408; Rev 4; 11/18
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Absolute Maximum Ratings
Supply Voltage (V
to GND). ...............................-0.3V to +6V
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
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
8-Pin TDFN (derate 24.4mW/°C above +70°C) .....1951.2mW
8-Bump μMAX (derate 4.8mW/°C above +70°C).....387.8mW
10-Bump μMAX (derate 8.8mW/°C above +70°C)...707.3mW
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
CC
(V
= 3V for MAX4061/MAX4062, V
= 5V for MAX4060, V
= 0V, V
= V , V
= 0V, R = 11.11kΩ,
CC
GND
SHDN
CC
INT/AUX G
R
= 100kΩ to 1.5V, R
= ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 2)
MAX A
L
BIAS
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MAX4061/MAX4062
MAX4060
MIN
2.4
TYP
MAX
5.5
UNITS
Inferred from
PSRR test
Supply Voltage Range
V
V
CC
4.5
5.5
Supply Current
I
0.75
1.5
1.2
mA
V
CC
Output Common-Mode Voltage
Slew Rate
V
OCM
SR
1.25
1.75
A
V
= 10V/V
±1
V/µs
µA
V
Supply Current in Shutdown
I
= 0V, MAX4061
SHDN
0.001
30
1
SHDN
To GND
Output Short-Circuit Current
I
mA
SC
To V
30
CC
DIFFERENTIAL INPUT (V
= 0V for MAX4060/MAX4062, default for MAX4061)
INT/AUX
Input Offset Voltage
V
±0.1
±5
2
mV
V
OS
Common-Mode Input Voltage
Range
V
1
CM
Maximum Differential Input Voltage
V
A
= 1V/V, MAX4061/MAX4062
1
V
DIFFMAX
V
Small-Signal Bandwidth
Input Resistance
BW
R
600
100
1
kHz
kΩ
%
-3dB
Either differential input
IN
Input Resistance Match
R
MATCH
A
A
only
= 10V/V, f = 1kHz
100
V
Input Noise-Voltage Density
RMS Output Noise Voltage
e
n
nV/√Hz
= 100V/V, f = 1kHz, MAX4061/MAX4062
V
20
V
A
= 10V/V, BW = 22Hz to 22kHz
125
µV
RMS
NRMS
V
Maxim Integrated
│ 2
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Electrical Characteristics (continued)
(V
= 3V for MAX4061/MAX4062, V
= 5V for MAX4060, V
= 0V, V
= V , V
= 0V, R = 11.11kΩ,
CC
CC
GND
SHDN
CC
INT/AUX G
R
= 100kΩ to 1.5V, R
= ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 2)
MAX A
L
BIAS
A
MIN
PARAMETER
SYMBOL
CONDITIONS
= 10V/V, f = 1kHz, V = 0.7V
BW = 22Hz to 22kHz
MIN
TYP
MAX
UNITS
Total Harmonic Distortion
Plus Noise
A
,
RMS
V
OUT
THD+N
0.04
%
R
= open
1
1.13
10
1.3
10.4
104
10.4
1V < V
< 2V,
G
G
G
CM
V
= 0.7V
,
R
R
= 11.11kΩ
= 1.01kΩ
, MAX4060
9.6
96
9.6
OUT
RMS
Differential Gain
A
V/V
VDIFF
MAX4061/MAX4062
100
10.0
70
1V < V < 2V, V
= 0.7V
RMS
CM
OUT
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
V
= 500mV , f = 1kHz
dB
dB
CM
P-P
T
T
= +25°C
72
60
89
A
A
= T
to T
MAX
MIN
V
= 5V ±100mV, f = 1kHz
86
CC
AUXILIARY INPUT (MAX4060/MAX4062, INT/AUX = V
)
CC
Small-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
µV
RMS
n
V
BW = 22Hz to 22kHz
385
NRMS
Total Harmonic Distortion
Plus Noise
THD+N
PSRR
f = 1kHz, BW = 22Hz to 22kHz
0.05
90
%
T
T
= +25°C
65
50
A
Power-Supply Rejection Ratio
dB
= T
- T
A
MIN
MAX
Voltage Gain
A
V
= 0.7V
-10.7
-10
-9.3
V/V
VAUX
OUT
RMS
BIAS OUTPUT (MAX4060/MAX4062)
I
I
I
= 0.8mA to GND, MAX4060
= 0.5mA to GND, MAX4062
= 0.8mA to GND, MAX4060
2
2
2.2
2.2
BIAS
BIAS
BIAS
Output Voltage
V
V
kΩ
Ω
OUT
2
2.5
22
50
20
(T = +25°C)
A
Output Resistance
R
OUT
I
= 0.5mA to GND, MAX4062
BIAS
40
(T = +25°C)
A
I
= 0.8mA to GND, BW = 22Hz to
BIAS
22kHz, MAX4060
Output Noise Voltage
V
µV
RMS
NRMS
I
= 0.5mA to GND, BW = 22Hz to
BIAS
22kHz, MAX4062
Maxim Integrated
│ 3
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Electrical Characteristics (continued)
(V
= 3V for MAX4061/MAX4062, V
= 5V for MAX4060, V
= 0V, V
= V , V
= 0V, R = 11.11kΩ,
CC
CC
GND
SHDN
CC
INT/AUX G
R
= 100kΩ to 1.5V, R
= ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Notes 1, 2)
MAX A
L
BIAS
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
V
= 0.8mA to GND,
= 4.5V to 5.5V
BIAS
50
80
CC
MAX4060
MAX4062
I
= 0.8mA, V
= 5V
BIAS
CC
70
74
71
+ 100mV , f = 1kHz
P-P
Power-Supply Rejection Ratio
PSRR
dB
I
V
= 0.5mA to GND,
= 2.4V to 5.5V
BIAS
50
CC
I
= 0.5mA, V
= 3V
BIAS
CC
+ 100mV , f = 1kHz
P-P
DIGITAL INPUTS (SHDN for MAX4061 and INT/AUX for MAX4060/MAX4062)
Input Leakage Current
I
V
= 0V or V
CC
±1
µA
V
IN
IN
0.7 x
Input-Voltage High
V
INH
V
CC
0.3 x
Input-Voltage Low
V
V
INL
V
CC
Shutdown Enable Time
Shutdown Disable Time
t
MAX4061
MAX4061
10
10
µs
µs
ON
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: MAX4062 requires a 1μF capacitor from BIAS to ground.
Maxim Integrated
│ 4
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics
(V
= 3V (MAX4061/MAX4062), V
= 5V for MAX4060, A = 10V/V, R ≥ 100kΩ to 1.5V, SHDN = V
(MAX4061 only),
CC
CC
V
L
CC
T
= +25°C, unless otherwise noted.)
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
CC
= 5V
-40
V
CC
= 3V
-3
-60
A
= 10V/V
V
-6
-80
-9
-100
-120
-12
-15
A
V
= 100V/V
100k
10
100
1k
10k
100k
1M
10
100
1k
10k
1M
85
5
-40 -25 -10
5
20 35 50 65 80
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
OUTPUT-VOLTAGE HIGH
vs. TEMPERATURE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
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
OH
= V - V
CC OUT
I
= 2.5mA
LOAD
1
0.1
0.01
0.001
A
= 10V/V
V
I
= 50µA
60
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
-40
-15
10
35
85
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT-VOLTAGE LOW
vs. TEMPERATURE
OUTPUT-VOLTAGE HIGH
vs. LOAD CURRENT
OUTPUT-VOLTAGE LOW
vs. LOAD CURRENT
175
150
125
100
75
300
250
200
150
100
50
1000
100
10
V
= V - V
CC OUT
OH
V
CC
= 3V
I
= 2.5mA
LOAD
V
= 3V
CC
50
25
I
= 50µA
60
LOAD
0
0
1
10
35
0
1
2
3
LOAD CURRENT (mA)
4
0
1
2
3
4
5
-40
-15
85
LOAD CURRENT (mA)
TEMPERATURE (°C)
Maxim Integrated
│ 5
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics (continued)
(V
= 3V (MAX4061/MAX4062), V
= 5V for MAX4060, A = 10V/V, R ≥ 100kΩ to 1.5V, SHDN = V
(MAX4061 only),
CC
CC
V
L
CC
T
= +25°C, unless otherwise noted.)
A
MAX4060
TOTAL HARMONIC DISTORTION PLUS NOISE
TOTAL HARMONIC DISTORTION PLUS NOISE
MIC BIAS VOLTAGE vs. TEMPERATURE
vs. FREQUENCY (DIFF INPUT)
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
OUT
= 2.26V
P-P
V
OUT
= 2.26V
P-P
I
= 800mA
BIAS
V
CC
= 3V
V
CC
= 3V
= 5V
0.1
0.01
0.1
0.01
V
= 5V
V
CC
CC
0.001
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 = 3V)
(AUX INPUT, V = 3V)
(DIFF INPUT, V = 5V)
CC
CC
CC
10
10
10
BW = 22kHz
BW = 22kHz
BW = 22kHz
f = 1kHz
1
0.1
1
0.1
1
0.1
f = 1kHz
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
)
OUTPUT VOLTAGE (V
P-P
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
100ms/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT VOLTAGE (V
FREQUENCY (Hz)
)
P-P
Maxim Integrated
│ 6
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics (continued)
(V
= 3V (MAX4061/MAX4062), V
= 5V for MAX4060, A = 10V/V, R ≥ 100kΩ to 1.5V, SHDN = V
(MAX4061 only),
CC
CC
V
L
CC
T
= +25°C, unless otherwise noted.)
A
MAX4062
SMALL-SIGNAL TRANSIENT RESPONSE
MIC BIAS OUTPUT NOISE
FOR DIFF INPUT
MAX4060 toc19
MAX4060 toc20
V
CC
= 5V
BW = 22Hz TO 22kHz
INPUT
5mV/div
5µV/div
OUTPUT
50mV/div
10µs/div
100ms/div
SMALL-SIGNAL TRANSIENT RESPONSE
LARGE-SIGNAL TRANSIENT RESPONSE
FOR AUX INPUT
FOR DIFF INPUT
MAX4060 toc21
MAX4060 toc22
INPUT
100mV/div
INPUT
5mV/div
OUTPUT
1V/div
OUTPUT
50mV/div
10µs/div
10µs/div
LARGE-SIGNAL TRANSIENT RESPONSE
FOR AUX INPUT
OUTPUT OVERDRIVEN
MAX4060 toc23
MAX4060 toc24
INPUT
DIFFERENTIAL INPUT
200mV/div
INPUT
500mV/div
OUTPUT
1V/div
OUTPUT
1V/div
10µs/div
10µs/div
Maxim Integrated
│ 7
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
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 microphone input.
1
2
3
—
3
2
3
INT/AUX
OUT
Amplifier Output. OUT is high impedance when in shutdown mode.
External Electret Microphone Capsule Bias Output. BIAS has a greater than 2kΩ
output impedance.
—
—
BIAS
4
5
6
7
4
5
6
7
5
6
7
8
V
Power Supply. Bypass the V
to GND with a 0.1µF capacitor.
CC
CC
IN+
IN-
Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+.
Inverting Differential Amplifier 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
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.)
—
1
1
Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for
shutdown mode.
—
—
—
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 amplifier.
10
Exposed Pad (TDFN Only). Internally connected to GND. Connect to a large
ground plane to minimize thermal performance. Not intended as an electrical
connection point.
—
—
—
EP
mode for ultimate power savings. The differential gain of
the MAX4061/MAX4062 is set with a single resistor con-
nected between the G1 and G2 pins. The MAX4060 has
a fixed gain of 10V/V.
Detailed Description
The MAX4060/MAX4061/MAX4062 are differential micro-
phone preamplifiers providing high-quality audio, opti-
mized for use in computer and mobile applications. These
devices feature rail-to-rail outputs, very high power-supply
rejection, and common-mode rejection, making them
ideal for low-noise applications. The MAX4060/MAX4061/
MAX4062 are particularly effective when layout con-
straints force the microphone amplifier to be physically
remote from the ECM microphone and/or the rest of the
audio circuitry.
Differential Input
The main microphone input is a low-noise, differential
input structure. This is an almost essential element when
faced with amplification of low-amplitude analog signals
in digitally intense environments such as notebook 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 differ-
ential input or single-ended auxiliary input. In addition,
the MAX4060 has an internal bias generator to bias the
microphone in either differential or single-ended modes.
The MAX4061 includes a complete 0.3μA shutdown
●
●
Better power-supply noise rejection.
Less degradation from noise in PC board ground
planes.
●
The microphone and preamplifier can be placed
physically further apart, easing PC board layout
restrictions.
Maxim Integrated
│ 8
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Functional Diagram
2.4V TO 5.5V
4
BIAS
V
CC
MAX4060
INT/AUX
OUT
AUX_IN
8
x10
1
2
BIAS
5
IN+
IN-
x10
V
6
BIAS
3
BIAS
BIAS
GND
7
Fixed Differential Gain (MAX4060)
Input Capacitors
The MAX4060 has an internal fixed gain of 10V/V for its
differential input. This feature simplifies design, reduces
pin count, footprint, and eliminates external gain-setting
resistors.
The two differential microphone inputs and the sin-
gle-ended auxiliary input of the MAX4060/MAX4061/
MAX4062 have on-chip bias components, allowing the
user to AC-couple any signals onto 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:
Adjustable Differential-Gain Setting
The MAX4061/MAX4062 allow the user to alter the gain
to optimize the signal-to-noise ratio (SNR) of their system.
C
= 1 / (2πf
R )
CUT IN
IN
The gain is set by a single external resistor (R ) con-
G
This assumes a low source impedance driving the inputs.
nected between the G1 and G2 pins, where:
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 capacitors
is to deliberately oversize the values on the differential
R
= 100kΩ / (A - 1)
V
G
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
- V
)
OUT
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.
Maxim Integrated
│ 9
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
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
inputs and to set the lower 3dB point (f
fier by sizing the output capacitor appropriately.
) of the ampli-
Auxiliary Input
CUT
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.
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 provid-
ing to any signal applied equally to the IN+ and INinputs.
In the case of amplifying low-level microphone signals in
noisy digital environments, it is a key figure of merit. In
Microphone Bias Voltage
MAX4060
The MAX4060 has a microphone bias voltage designed
to comply with the Microsoft/Intel PC99/2001 audio stan-
dard. It features source impedance of greater than 2kΩ,
and delivers more than 2V of bias when loaded with a cur-
rent of 800μA. This limits operation of this part to supplies
between 4.5V to 5.5V (see Figure 2).
audio circuits, this is generally measured for V as an
IN
AC signal:
CMRR(dB) = A
/ A
DM
CM
where A
is the differential gain, A
is the common-
DM
CM
mode gain.
Input voltages are sufficiently small such that the output is
not clipped in either differential or common-mode applica-
tion. The topology used in the MAX4061/MAX4062 means
that the CMRR actually improves at higher differential
gains—another advantage of using differential sensing.
Maxim Integrated
│ 10
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
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
Applications Information
The MAX4062 has a lower bias voltage and low-imped-
ance outputs (optimum electret bias resistor can then be
set externally). This gives a low-noise, flexible solution
that can run from 2.4V to 5.5V, suitable for handheld
devices such as PDAs that typically have audio power
supplies in the 3V region (see Figure 3).
Shutdown Mode
The MAX4061 features a low-power, complete shutdown
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.
In applications where the differential microphone is placed
some distance from the MAX4060/MAX4061/MAX4062,
using a remote differential bias scheme as shown in
Figure 4 can provide improved noise rejection.
Power Supplies and Layout
The MAX4060 operates from a 4.5V to 5.5V single sup-
ply and the MAX4061/MAX4062 operate from a 2.4V to
5.5V single supply. Bypass the power supply with a 0.1μF
capacitor to ground. In systems 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 perfor-
mance. The MAX4061 output is high impedance when the
part is in shutdown mode. AC-coupling the output into the
next audio stage (e.g., CODEC) is recommended.
Maxim Integrated
│ 11
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
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
3
INT/AUX
2.2kΩ
10 G1
R
11kΩ
G
OUT
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
Maxim Integrated
│ 12
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
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
3
INT/AUX
V
DD
10 G1
1kΩ
R
11kΩ
G
OUT
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
OUT
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
GND
IN-
MAX4061
MAX4060
9
8
7
6
AUX_IN
BIAS
MAX4062
µMAX
EP*
EP*
GND
IN-
V
IN+
V
CC
IN+
CC
BIAS
µMAX/TDFN
µMAX/TDFN
V
CC
IN+
*CONNECT EP TO GND (TDFN ONLY).
Maxim Integrated
│ 13
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
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
CC
2.4V TO 5.5V
4
MAX4060
MAX4062
V
CC
8
3
AUX_IN
BIAS
8
4
AUX_IN
BIAS
x10
x10
MAX4061
2
INT/AUX
SHDN
2
5
INT/AUX
1
V
BIAS
V
BIAS
IN+
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
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.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 PACKAGE DOCUMENT
LAND
TYPE
8 TDFN
8 μMAX
10 μMAX
CODE
T833+2
U8+1
NO.
PATTERN NO.
21-0137
21-0036
21-0061
90-0059
90-0092
90-0330
U10+2
Maxim Integrated
│ 14
www.maximintegrated.com
MAX4060/MAX4061/
MAX4062
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
3
4
4/11
Added exposed pad information to Pin Description and Pin Configurations sections
Updated Package Information sections
8, 13
14
11/18
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2018 Maxim Integrated Products, Inc.
│ 15
相关型号：
MAX4063ETE+
Audio Preamplifier, 1 Channel(s), 1 Func, BICMOS, 4 X 4 MM, 0.80 MM PITCH, TQFN-16
MAXIM
MAX4063ETE-T
Audio Preamplifier, 1 Channel(s), 1 Func, BICMOS, 4 X 4 MM, 0.80 MM PITCH, TQFN-16
MAXIM
©2020 ICPDF网 联系我们和版权申明