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PDF LMV1091 Data sheet ( Hoja de datos )
| Número de pieza | LMV1091 | |
| Descripción | Far Field Noise Suppression Microphone Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LMV1091
October 28, 2009
Dual Input, Far Field Noise Suppression Microphone
Amplifier
General Description
The LMV1091 is a fully analog dual differential input, differ-
ential output, microphone array amplifier designed to reduce
background acoustic noise, while delivering superb speech
clarity in voice communication applications.
The LMV1091 preserves near-field voice signals within 4cm
of the microphones while rejecting far-field acoustic noise
greater than 50cm from the microphones. Up to 20dB of far-
field rejection is possible in a properly configured and using
±0.5dB matched micropohones.
Part of the Powerwise™ family of energy efficient solutions,
the LMV1091 consumes only 600μA of supply current pro-
viding superior performance over DSP solutions consuming
greater than ten times the power.
The dual microphone inputs and the processed signal output
are differential to provide excellent noise immunity. The mi-
crophones are biased with an internal low-noise bias supply.
Key Specifications
■ Far Field Noise Suppression Electrical *
■ SNRIE
■ Supply voltage
■ Supply current
■ Standby current
■ Signal-to-Noise Ratio (Voice band)
■ Total Harmonic Distortion + Noise
■ PSRR (217Hz)
*FFNSE at f = 1kHz
34dB (typ)
26dB (typ)
2.7V to 5.5V
600μA (typ)
0.1μA (typ)
65dB (typ)
0.1% (typ)
99dB (typ)
Features
■ No loss of voice intelligibility
■ Low power consumption
■ Shutdown function
■ No added processing delay
■ Differential outputs
■ Adjustable 12 - 54dB gain
■ Excellent RF immunity
■ Available in a 25–bump micro SMD package
Applications
■ Mobile headset
■ Mobile and handheld two-way radios
■ Bluetooth and other powered headsets
■ Hand-held voice microphones
www.DaStayShseteet4mU.coDmiagram
© 2009 National Semiconductor Corporation 300922
30092240
www.national.com
1 page  
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Power Dissipation (Note 3)
ESD Rating (Note 4)
ESD Rating (Note 5)
CDM
Junction Temperature (TJMAX)
6.0V
-85°C to +150°C
Internally Limited
2000V
200V
500V
150°C
Mounting Temperature
Infrared or Convection (20 sec.)
235°C
Thermal Resistance
θJA (microSMD)
70°C/W
Soldering Information See AN-1112 “microSMD Wafer Level
Chip Scale Package.”
Operating Ratings (Note 1)
Supply Voltage
TMIN ≤ TA ≤ TMAX
2.7V ≤ VDD ≤ 5.5V
−40°C ≤ TA ≤ +85°C
Electrical Characteristics 3.3V (Note 1, Note 2)
Unless otherwise specified, all limits guaranteed for TA = 25°C, VDD = 3.3V, VIN = 18mVP-P, f = 1kHz, SD = VDD, Pre Amp gain =
20dB, Post Amp gain = 6dB, RL = 100kΩ, and CL = 4.7pF, f = 1kHz pass through mode.
Symbol
Parameter
Conditions
LMV1091
Typical Limits
(Note 6) (Note 7)
Units
(Limits)
SNR Signal-to-Noise Ratio
VIN = 18mVP-P, A-weighted, Audio band
VOUT = 18VP-P,
voice band (300–3400Hz)
63
65
dB
dB
eN Input Referred Noise level
VIN Maximum Input Signal
Maximum AC Output Voltage
VOUT
DC Level at Outputs
A-Weighted
THD+N < 1%, Pre Amp Gain = 6dB
Differential Out+, Out-
THD+N < 1%
Out+, Out-
5 μVRMS
880 820 mVP-P (min)
1.2 1.1 VRMS (min)
820 mV
THD+N Total Harmonic Distortion + Noise
Differential Out+ and Out-
0.1 0.2 % (max)
ZIN Input Impedance
ZOUT Output Impedance
ZLOAD Load Impedance (Out+, Out-) (Note 9)
AM Microphone Preamplifier Gain Range
RLOAD
CLOAD
Minimum
Maximum
142 kΩ
220 Ω
10 kΩ (min)
100 pF (max)
6 dB
36 dB
wwAwMR.DataMRSeihcserooelput4htiUoo.nnceomPreamplifier Gain Adjustment
2
1.7 dB (min)
2.3 dB (max)
AP Post Amplifier Gain Range
Minimum
Maximum
6 dB
18 dB
APR Post Amplifier Gain Resolution
3
2.6 dB (min)
3.4 dB (max)
FFNSE Far Field Noise Suppression Electrical
f = 1kHz (See Test Method)
f = 300Hz (See Test Method)
34 26
42
dB
SNRIE Signal-to-Noise Ratio Improvement Electrical
f = 1kHz (See Test Method)
f = 300Hz (See Test Method)
26 18
33
dB
Input Referred, Input AC grounded
PSRR Power Supply Rejection Ratio
CMRR Common Mode Rejection Ratio
fRIPPLE = 217Hz (VRIPPLE = 100mVP-P) 99 85 dB (min)
fRIPPLE = 1kHz (VRIPPLE = 100mVP-P)
95 80 dB (min)
Input referred
60 dB
VBM Microphone Bias Supply Voltage
IBIAS = 1.2mA
2.0
1.85 V (min)
2.15 V (max)
eVBM Mic bias noise voltage on VREF pin
IDDQ Supply Quiescent Current
IDD Supply Current
A-Weighted, CB = 10nF
VIN = 0V
VIN = 25mVP-P both inputs
Noise cancelling mode
7
0.60
0.60
μVRMS
0.8 mA (max)
mA
5 www.national.com
5 Page 
THD+N vs Input Voltage
f = 1kHz
Mic1 Pass Through Mode
THD+N vs Input Voltage
f = 1kHz
Mic2 Pass Through Mode
30092263
PSRR vs Frequency
Pre Amp Gain = 20dB, Post Amp Gain = 6dB
VRIPPLE = 100mVP-P, Mic1 = Mic2 = AC GND
Mic1 Pass Through Mode
30092264
PSRR vs Frequency
Pre Amp Gain = 20dB, Post Amp Gain = 6dB
VRIPPLE = 100mVP-P, Mic1 = Mic2 = AC GND
Mic2 Pass Through Mode
30092265
www.DataSheet4U.com
PSRR vs Frequency
Pre Amp Gain = 20dB, Post Amp Gain = 6dB
VRIPPLE = 100mVP-P, Mic1 = Mic2 = AC GND
Noise Canceling Mode
30092266
Far Field Noise Suppression Electrical vs Frequency
30092267
11
30092268
www.national.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LMV1091.PDF ] | |
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