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부품번호 | LM4930ITL 기능 |
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기능 | Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 33 페이지수
July 2003
LM4930
Audio Subsystem with Stereo Headphone & Mono
Speaker Amplifiers
General Description
The LM4930 is an integrated audio subsystem that supports
voice and digital audio functions. The LM4930 includes a
high quality I2S input stereo DAC, a voice band codec, a
stereo headphone amplifier and a high-power mono speaker
amplifier. It is primarily designed for demanding applications
in mobile phones and other portable devices.
The LM4930 features an I2S serial interface for full range
audio, a 16-bit PCM bi-directional serial interface for the
voice band codec and an two-wire interface for control. The
full range music path features an SNR of 86dB with a 16-bit
48kHz input. The stereo DAC can also be used while the
voice codec is in use. The headphone amplifier delivers
25mWRMS to a 32Ω single-ended stereo load with less than
0.5% distortion (THD+N) when AVDD = 3V. The mono
speaker amplifier delivers up to 300mW into an 8Ω load with
less than 2% distortion when AVDD = 3V.
The LM4930 employs advanced techniques to reduce power
consumption, to reduce controller overhead and to eliminate
click and pop. Boomer audio power amplifiers were de-
signed specifically to provide high quality output power with
a minimal amount of external components. It is, therefore,
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
Key Specifications
j PH/P OUT at AVDD = 3.0V, 32Ω
0.5% THD+N
j PLS OUT at AVDD = 3.0V, 8Ω
2% THD+N
j Supply voltage range
DVDD (Note 8)
AVDD (Note 8)
j Total shutdown current
j PSRR at 217Hz, AVDD = 3V
25mW (typ)
300mW (typ)
2.6V to 4.5V
2.6V to 5.5V
2µA (typ)
50dB (typ)
Features
n 16-bit resolution 48kHz stereo DAC
n 16-bit resolution 8kHz voice codec
n I2S digital audio data serial interface
n Two-wire serial control interface
n PCM voice audio data serial interface
n 25mW/channel stereo headphone amplifier
n 300mW mono 8Ω amplifier (at AVDD = 3.0V)
n 32-step volume control for audio output amplifiers
n No snubber networks or bootstrap capacitors are
required by the headphone or hands-free amplifiers
n Digital sidetone generation with adjustable attenuation
n Gain controllable headphone amp, mono BTL amp, mic
preamp
n Available in the 36 bump micro SMD package
Applications
n Mobile Phones
n Mobile/low power audio appliances
n PDAs
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200720
www.national.com
F2 LS+
F3 AVDD_LS
F4 DGND_X
F5 DVDD_X
F6 MCLK/XTAL_IN
Pin Descriptions (Continued)
Loudspeaker amplifier BTL positive out (+)
Analog VDD for loudspeaker amplifier
Digital ground
Digital VDD
12.288MHz or 24.576MHz Master Clock from crystal (via XTAL OUT) or external source
SYSTEM CONTROL REGISTERS
The LM4930 is controlled with a two-wire serial interface. This interface is used to configure the operating mode, digital interfaces,
and delta-sigma modulators. The LM4930 is controlled by writing information into a series of write-only registers, each with its own
unique 7 bit address. The following registers are programmable:
Basic Config Register
This register is used to configure the I2S and PCM interfaces as well as the 48kHz DAC module. The 7 bit address for the
BASICCONFIG register is XX10000. (X = 0 if ADDR is set to logic 0) (X = 1 if ADDR is set to logic 1)
BASIC CONFIGURATION (XX1000). (Set = logic 1, Clear = logic 0)
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RESET 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Address
3:0
4
5
6
7
8:9
Register
MODE
SOFT_RESET
PCM_LONG
PCM_COMPANDED
PCM_LAW
PCM_SYNC_MODE
Description
The LM4930 can be placed in one of several modes that dictate the basic operation. When a
new mode is selected the LM4930 will change operation silently and will reconfigure the
power management profile automatically. The modes are described as follows: (Note 14)
Mode
Mono Speaker Headphone Left Headphone Right Comment
Amplifier Source Source
Source
0000
None
None
None
Powerdown mode
0001
None
None
None
Standby Mode
0010
Voice
None
None
Mono speaker
mode
0011
None
Voice
Voice
Headphone call
mode
0100
Voice
Voice
Voice
Conference call
mode
0101
Audio (L+R)
None
None
L+R mixed to
mono speaker
0110
None
Audio (Left)
Audio (Right)
Headphone
stereo audio
0111
Audio (L+R)
Audio (Left)
Audio (Right)
L+R mixed to
mono speaker +
stereo headphone
audio
1000
Audio (Left)
Voice
Voice
Mixed Mode
1001
Voice + Audio
Voice
Voice
Mixed mode
(Left)
1010
Voice
Audio (Left)
Audio (Left)
Mixed Mode
Resets the LM4930, excluding the control registers
If set the PCM interface uses a long frame sync. (Note 12)
If set the 8 MSBs are presumed to be companded data and the 8 LSBs are ignored. (Note
12)
If set, the companded G711 data is set to be A-law, else m-law is assumed (Note 12)
Sets 1 (00h), 2 (01h) or 4(10h) 16 bit frames per sync. The PCM_SDO pin is tri-stated during
the latter frames. (Note 12)
www.national.com
4
4페이지 SYSTEM CONTROL REGISTERS (Continued)
Gain Config Registers (Continued)
15:14 RSVD
13:10
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
RESERVED (Note 13)
Mic Preamp Gain
17dB
19dB
21dB
23dB
25dB
27dB
29dB
31dB
33dB
35dB
37dB
39dB
41dB
43dB
45dB
47dB
Two-wire control Interface Timing Diagram
FIGURE 2.
20072009
PCM Receive Timing Diagram
FIGURE 3.
7
20072008
www.national.com
7페이지 | |||
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부품번호 | 상세설명 및 기능 | 제조사 |
LM4930ITL | Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers | National Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |