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PDF LM4934 Data sheet ( Hoja de datos )
| Número de pieza | LM4934 | |
| Descripción | 3D Audio Sub-System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4934 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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www.DataSheet4U.com
November 2005
LM4934
3D Audio Sub-System with Stereo Speaker, OCL/SE
Stereo Headphone, Earpiece and Mono Line Level
Outputs
General Description
The LM4934 is an integrated audio sub-system designed for
stereo cell phone applications. Operating on a 3.3V supply, it
combines a stereo speaker amplifier delivering 520mW per
channel into an 8Ω load, a stereo headphone amplifier de-
livering 36mW per channel into a 32Ω load, a mono earpiece
amplifier delivering 55mW into a 32Ω load, and a line output
for an external powered handsfree speaker. It integrates the
audio amplifiers, volume control, mixer, power management
control, and National 3D enhancement all into a single pack-
age. In addition, the LM4934 routes and mixes the stereo
and mono inputs into multiple distinct output modes. The
LM4934 features an I2S serial interface for full range audio
and an I2C/SPI compatible interface for control.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
Key Specifications
j POUT, Stereo BTL, 8Ω, 3.3V,
1% THD+N
j POUT HP, 32Ω, 3.3V, 1% THD+N
j POUT Mono Earpiece, 32Ω, 3.3V,
1% THD+N
j Shutdown current
j DAC SNR
520mW (typ)
36mW (typ)
55mW (typ)
0.6µA (typ)
95dB (typ)
Features
n 18-bit stereo DAC
n Multiple distinct output modes
n Stereo speaker amplifier
n Stereo headphone amplifier
n Mono earpiece amplifier
n Mono Line Output for external handsfree carkit
n Independent Left, Right, headphone and Mono speaker
volume controls
n National 3D enhancement with programmable effect
level
n I2C/SPI (selectable) compatible interface
n Ultra low shutdown current
n Click and Pop Suppression circuit
Applications
n Cell Phones
n PDAs
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201669
www.national.com
1 page  
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Analog Supply Voltage
Digital Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility(Note 5)
Junction Temperature
Thermal Resistance
6.0V
6.0V
-65˚C to +150˚C
-0.3V to VDD +0.3V
Internally Limited
2000V
200V
150˚C
θJA (WLA42)
See AN-1279
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage
61˚C/W
−40˚C ≤ TA ≤ +85˚C
2.7V ≤ AVDD ≤ 5.5V
2.7V ≤ DVDD ≤ 4.0V
2.4V ≤ I2CVDD ≤ 4.0V
Audio Amplifier Electrical Characteristics AVDD = 3.0V, DVDD = 3.0V (Notes 1,
2)
The following specifications apply for the circuit shown in Figure 1 with all programmable gain set at 0dB, unless otherwise
specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4934
Units
Typical Limits (Limits)
(Note 6) (Notes
7, 8)
IDD
ISD
PO
VFS DAC
THD+N
VOS
∈O
PSRR
Supply Current
Shutdown Current
Output Power
Full Scale DAC Output
Total Harmonic Distortion
Offset Voltage
Output Noise
Power Supply Rejection Ratio
VIN = 0, No Load
All Amps On + DAC, OCL
Headphone Mode Only, OCL
Stereo Speaker Mode Only
Mono Earpiece Mode Only
DAC Off, All Amps On, OCL
Speaker; THD = 1%;
f = 1kHz, 8Ω BTL
Headphone; THD = 1%;
f = 1kHz, 32Ω SE
Earpiece; THD = 1%;
f = 1kHz, 32Ω BTL
Speaker; PO = 200mW;
f = 1kHz, 8Ω BTL
Headphone; PO = 10mW;
f = 1kHz, 32Ω SE
Earpiece; PO = 20mW;
f = 1kHz, 32Ω BTL
Line Out; VO = 1Vrms; f = 1kHz, 10kΩ SE
Speaker
Earpiece
HP (OCL)
A = weighted; 0dB gain;
See Table 1
f = 217Hz; Vripple = 200mVP-P
CB = 2.2µF; See Table 2
18.5
5.6
12
5.9
14.6
0.6
420
27
45
2.4
0.04
0.01
0.04
0.004
8
8
8
Table 1
Table 2
26.5
8
19.5
8
22
2
370
24
40
55
50
40
mA (max)
mA (max)
mA (max)
mA (max)
mA (max)
µA (max)
mW (min)
mW (min)
mW (min)
Vpp
%
%
%
%
mV (max)
mV (max)
mV
5 www.national.com
5 Page 
System Control
The LM4934 is controlled via either a three wire SPI or a two wire I2C compatible interface, selectable with the MODE pin. When
MODE is cleared the device is in I2C mode, when MODE is set the device is in SPI mode. This interface is used to configure the
operating mode, interfaces, data converters, mixers and amplifiers. The LM4934 is controlled by writing 8 bit data into a series
of write-only registers, the device is always a slave for both type of interfaces.
THREE WIRE, SPI INTERFACE (MODE = 1)
Three Wire Mode Write Bus Transaction
Three Wire Mode Write Bus Timing
20166959
20166960
FIGURE 3. Three Wire Mode Write Bus
When the part is configured as an SPI device and the enable (ENB) line is lowered the serial data on SDI is clocked in on the
rising edge of the SCK line. The protocol used is 16bit, MSB first. The upper 8 bits (15:8) are used to select an address within
the device, the lower 8 bits (7:0) contain the updated data for this register.
TWO WIRE I2C COMPATIBLE INTERFACE (MODE = 0)
Two Wire Mode Write Bus Transaction
Two Wire Mode Write Bus Timing
201669J6
FIGURE 4. Two Wire Mode Write Bus
11
20166962
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| PDF Descargar | [ Datasheet LM4934.PDF ] | |
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