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PDF MAX4060-MAX4062 Data sheet ( Hoja de datos )
| Número de pieza | MAX4060-MAX4062 | |
| Descripción | Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown | |
| Fabricantes | Maxim Integrated | |
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19-2408; Rev 1; 1/03
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.
Applications
Notebook Audio
Systems
Tablet PCs
PDA Audio Systems
USB Audio Peripherals
AES-42-Compliant
Microphones
Signal Conditioning
Ordering Information
PART
TEMP
RANGE
MAX4060ETA -40°C to +85°C
MAX4060EUA -40°C to +85°C
MAX4061ETA -40°C to +85°C
MAX4061EUA -40°C to +85°C
MAX4062EUB -40°C to +85°C
*EP = Exposed paddle.
PIN-
PACKAGE
8 Thin QFN-EP*
8 µMAX
8 Thin QFN-EP*
8 µMAX
10 µMAX
TOP
MARK
ABY
—
ABZ
—
—
Pin Configurations and Selector Guide appear at end of
data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Features
o 2.4V to 5.5V Single-Supply Operation
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
o 0.3µA Shutdown Current
o ±4kV ESD Protection (AUX_IN)
o Rail-to-Rail® Outputs
o THD+N: 0.04% at 1kHz
o Available in Space-Saving Packages
8-Pin Thin QFN (MAX4060/MAX4061)
8-Pin µMAX (MAX4060/MAX4061)
10-Pin µMAX (MAX4062)
Typical Operating Circuit
2.4V TO 5.5V
BIAS
4
VCC
MAX4060
8 AUX_IN x10
INT/AUX 1
BIAS
5 IN+
OUT 2
6 IN-
x10
VBIAS
BIAS
BIAS 3
GND
7
________________________________________________________________ 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.
1 page  
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
Typical Operating Characteristics
(VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL ≥ 100kΩ to 1.5V, SHDN = VCC (MAX4061 only),
TA = +25°C, unless otherwise noted.)
GAIN vs. FREQUENCY
(NO LOAD)
VCC = 5V
3
0
-3
-6
-9
-12
-15
10
100 1k 10k 100k
FREQUENCY (Hz)
1M
SUPPLY CURRENT vs. SUPPLY VOLTAGE
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1 AV = 10V/V
NO LOAD
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (DIFF INPUT)
0
-20
-40
-60
AV = 10V/V
-80
-100
-120
10
100
AV = 100V/V
100 1k 10k 100k
FREQUENCY (Hz)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
1M
10
1
0.1
0.01
0.001
-40
-15 10 35 60
TEMPERATURE (°C)
85
SUPPLY CURRENT vs. TEMPERATURE
1.0
0.8
VCC = 5V
0.6
VCC = 3V
0.4
0.2
0
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
VOH vs. TEMPERATURE
1000
VOH = VCC - VOUT
ILOAD = 2.5mA
100
10
1
-40
ILOAD = 50µA
-15 10 35 60
TEMPERATURE (°C)
85
VOL vs. TEMPERATURE
1000
ILOAD = 2.5mA
100
10
1
-40
ILOAD = 50µA
-15 10 35 60
TEMPERATURE (°C)
85
VOH vs. LOAD CURRENT
175
VOH = VCC - VOUT
150
125 VCC = 3V
100
75
50
25
0
01234
LOAD CURRENT (mA)
5
300
250
200
150
100
50
0
0
VOL vs. LOAD CURRENT
VCC = 3V
1234
LOAD CURRENT (mA)
5
_______________________________________________________________________________________ 5
5 Page 
Differential Microphone Preamplifiers with
Internal Bias and Complete Shutdown
MICROPHONE
INPUT
8 AUX_IN
4.5V TO 5.5V
4
VCC
x10
3 BIAS
RBIAS
VBIAS
5 IN+
6 IN-
x10
GND
7
MAX4060
INT/AUX 1
OUT 2
Figure 2. MAX4060 Used for Biasing a Microphone
MAX4061/MAX4062
The MAX4061/MAX4062 have a lower bias voltage and
low-impedance outputs (optimum electret bias resistor
can then be set externally). This gives a low-noise, flexi-
ble solution that can run from 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).
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.
Output
MAX4060/MAX4061 DC Bias
The output voltage has a DC-bias voltage independent
of the power supplies, resulting in superior PSRR per-
formance. 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 rec-
ommended.
Applications Information
Shutdown Mode
The MAX4061 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 floating.
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.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX4060-MAX4062.PDF ] | |
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