|
|
PDF LMV1099 Data sheet ( Hoja de datos )
| Número de pieza | LMV1099 | |
| Descripción | Uplink Far Field Noise Suppression & Downlink SNR Enhancing Microphone Amplifier | |
| Fabricantes | National Semiconductor Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LMV1099 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
DataSheet.in
LMV1099
August 12, 2010
Uplink Far Field Noise Suppression & Downlink SNR
Enhancing Microphone Amplifier with Earpiece Driver
General Description
The LMV1099 is an uplink and downlink voice intelligibility
enhancing analog IC, ideally suited for mobile handsets. Up-
link voice intelligibility is improved by rejecting far-field noise
through a unique two-microphone solution. Downlink voice
intelligibility is improved by enhancing the SNR (Signal-to-
Noise Ratio) between the downlink voice and the ambient
noise environment at the user’s earpiece.
The LMV1099 preserves uplink near-field voice signals within
close range of the microphones while rejecting far-field
acoustic noise greater than 0.5m from the microphones.
The LMV1099 also enhances downlink voice intelligibility by
improving near-field SNR based on the user’s environment.
The analog circuitry adapts dynamically to both the user’s
ambient noise environment as well as the downlink signal
amplitude to ensure optimum SNRI (signal-to-noise ratio im-
provement). The downlink path also provides uplink noise
attenuation through an adjustable high pass filter before the
SNR enhanced downlink voice reaches the user’s earpiece.
Unlike digital-based noise reduction solutions, the all-analog
low power consuming LMV1099 increases both uplink and
downlink voice intelligibility without DSP-type artifacts, distor-
tions or processing delays.
Key Specifications
■ Uplink Far Field Noise Suppression
(Electrical FFNSE at f = 1kHz)
■ Near-Field SNR Enhancement
■ Downlink SNRIE
■ Supply voltage range
33dB (typ)
6 to 18dB (typ)
16dB (typ)
2.7V to 5.5V
■ Supply current (VDD = 3.6V)
■ Shutdown current
■ Uplink PSRR (f = 217Hz)
■ Downlink SNR (A-weighted)
■ Downlink THD+N
■ Earpiece output power
(RL = 32Ω)
3.8mA (typ)
0.06μA (typ)
106dB (typ)
102dB (typ)
0.03% (typ)
83mW (typ)
Features
■ Noise reduction without DSP-type artifacts.
■ Adapting AGC (Automatic Gain Control) on ambient noise
level & downlink signal strength
■ Downlink adjustable noise-reducing high pass filter
■ Separate Uplink & Downlink Enable Functions
■ No added process delays
■ Low power consumption
■ Shutdown function
■ Maximum AGC Limiter
■ Differential inputs & outputs for noise immunity
■ Earpiece amplifier
■ Available in a 25-bump micro SMD
Applications
■ Mobile Handsets
■ Mobile and handheld two-way radios
■ Bluetooth and other power headsets
FIGURE 1. Voice Enhanced Signal
© 2010 National Semiconductor Corporation 301076
30107630
www.national.com
1 page  
DataSheet.in
Pin Descriptions
PIN NAME
D5 MIC1+
E5 MIC1-
B5 MIC2+
C5 MIC2-
E4 MIC BIAS
E3 REF
D3 OUT+
C3 LPF+
D4 OUT-
C4 LPF-
PIN NAME
A4 DV+
A5 DV-
A2 CT1
B2 CT2
B1 CT3
A3 GND
D1 Bypass
B3 EP+
B4 EP-
PIN NAME
D2 SCL
C2 EN
E2 SDA
E1 I2CVDD
A1 VDD
C1 DCAP
Note: Pin assignment subject to change.
TABLE 1. Pin Name and Function
TYPE
Analog Input
Analog Input
Analog Input
Analog Input
Analog Output
Analog Ref
Analog Output
Analog Input
Analog Output
Analog Input
UPLINK PIN DESCRIPTIONS
Uplink Voice Positive Microphone #1 Input
Uplink Voice Negative Microphone #1 Input
Uplink Voice Positive Microphone #2 Input
Uplink Voice Negative Microphone #2 Input
Microphone DC Bias Voltage Output
Microphone Reference Bypass Pin
Uplink Positive Output (To Baseband Chipset)
Uplink-Output Low Pass Filter Positive Feedback Input
Uplink Negative Output (To Baseband Chipset)
Uplink-Output Low Pass Filter Negative Feedback Input
TYPE
Analog Input
Analog Input
Analog Ref
Analog Ref
Analog Ref
Ground
Analog Ref
Analog Output
Analog Output
DOWNLINK PIN DESCRIPTIONS
Downlink Voice Positive Input
Downlink Voice Negative Input
Control Signal Timing Capacitor
Control Signal Timing Capacitor
Control Signal Timing Capacitor
Power Supply Ground Pin
Earpiece Reference Bypass Pin
Ear Speaker Positive Output (To Ear Piece Speaker)
Ear Speaker Negative Output (To Ear Piece Speaker)
TYPE
Digital Input
Digital Input
Digital I/O
Digital Supply
Supply
Analog Ref
DIGITAL INTERFACE & SUPPLY PIN DESCRIPTIONS
I2C Serial Clock Digital Input
I2C Chip Enable Digital Input
I2C Serial Data Address Digital Input/Output Pin
I2C Digital Supply Voltage Pin
Power Supply Voltage Pin
Voice Signal Detection Capacitor
5 www.national.com
5 Page 
DataSheet.in
THD+N vs Output Power
VDD = 3.6V, Downlink Path
THD+N vs Output Power
VDD = 5V, Downlink Path
30107666
THD+N vs Input Voltage
Mic1 Noise Cancelling Mode
Mic2 = AC GND, Uplink Path
30107667
THD+N vs Input Voltage
Mic2 Noise Cancelling Mode
Mic1 = AC GND, Uplink Path
30107668
Output Power vs Power Dissipation
VDD = 3.6V, Downlink Path
30107669
Output Power vs Power Dissipation
VDD = 5V, Downlink Path
30107627
11
30107628
www.national.com
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LMV1099.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LMV1090 | LMV1090 Dual Input Far Field Noise Suppression Microphone Amplifier (Rev. I) |  Texas Instruments |
| LMV1090 | Far Field Noise Suppression Microphone Amplifier | National Semiconductor Corporation |
| LMV1091 | LMV1091 Dual Input Far Field Noise Suppression Microphone Amplifier (Rev. C) | Texas Instruments |
| LMV1091 | Far Field Noise Suppression Microphone Amplifier |  National Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |