|
|
PDF LM4830N Data sheet ( Hoja de datos )
| Número de pieza | LM4830N | |
| Descripción | Two-Way Audio Amplification System with Volume Control | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LM4830N (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
January 1999
LM4830
Two-Way Audio Amplification System
with Volume Control
General Description
The LM4830 is an integrated solution for two-way audio am-
plification. It contains a bridge-connected audio power ampli-
fier capable of delivering 1W of continuous average power to
an 8Ω load with less than 1% THD from a 5V power supply.
It also has the capability of driving 100 mW into a
single-ended 32Ω impedance for headset operation. There
is a 30 dB attenuator in front of a bridged power amplifier
with 6 dB of gain. The attenuation is controlled through 4 bits
of parallel digital control; 15 steps of 2 dB each.
The device also contains a microphone preamp with two se-
lectable inputs. Mic2 is selected when HS is high and A1 is in
single-ended mode. Mic1 is selected when HS is low and A1
is in bridged mode. This configuration is optimum for switch-
ing between an internal system speaker and external head-
set with microphone. The device also incorporates a buffer
used for driving capacitive loads.
The LM4830 also provides a low-current consumption shut-
down mode making it optimally suited for low-power portable
systems. In addition, the device has an internal thermal shut-
down protection mechanism.
Key Specifications
n THD at 1W cont. avg PO into 8Ω: 1% (max)
n Instantaneous peak output power: 1.4W
n Shutdown current: 0.5 µA (typ)
n Supply voltage range: 2.7V ≤ V DD ≤ 5.5V
Features
n 4-bit digital control for 30 dB of volume attenuation
n Two selectable microphone inputs
n High performance microphone preamp
n Extra buffer for driving long cables
n No bootstrap capacitors or snubber circuits are
necessary
n Small Outline (SO) packaging
n Thermal shutdown protection circuitry
Applications
n Hands-free phone systems
n Mobile phone accessories
n Desktop conference phones
n Portable computers
n Teleconference computer applications
Connection Diagram
Dual-In-Line and
Small Outline Packages
DS012677-2
Top View
Order Number LM4830M
See NS Package Number M24B for SO
Order Number LM4830N
See NS Package Number N24A for DIP
© 1999 National Semiconductor Corporation DS012677
www.national.com
1 page  
Computer Application Circuit
FIGURE 2.
DS012677-4
5 www.national.com
5 Page 
Application Information (Continued)
This feature is especially useful when the IC is used in por-
table battery operated systems where energy conservation
is imperative.
In many applications, a microcontroller or microprocessor
output interfaces to the LM4830 shutdown pin, providing a
quick, smooth transition into shutdown. Another solution is to
use a single-pole, single-throw switch in conjunction with an
external pull-up resistor. When the switch is closed, the shut-
down pin is connected to ground and enables the amplifier. If
the switch is open, the external pull-up resistor disables the
LM4830 by bringing the shutdown pin up to VDD. This
scheme guarantees that the shutdown pin will not float, pre-
venting unwanted state changes.
Additionally, when the IC comes out of shutdown the IC’s
volume attenuation setting will remain unchanged.
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM4830N.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM4830 | Two-Way Audio Amplification System with Volume Control | National Semiconductor |
| LM4830M | Two-Way Audio Amplification System with Volume Control | National Semiconductor |
| LM4830N | Two-Way Audio Amplification System with Volume Control | 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 |