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PDF LM49321 Data sheet ( Hoja de datos )
| Número de pieza | LM49321 | |
| Descripción | Audio Sub-System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LM49321
August 31, 2009
Audio Sub-System with Stereo DAC, Mono Class AB
Loudspeaker Amplifier, OCL/SE Stereo Headphone Output
and RF Suppression
General Description
The LM49321 is an integrated audio sub-system designed for
mono voice, stereo music cell phones connecting to base
band processors with mono differential analog voice paths.
Operating on a 3.3V supply, it combines a mono speaker am-
plifier delivering 520mW into an 8Ω load, a stereo headphone
amplifier delivering 36mW per channel into a 32Ω load, and
a mono earpiece amplifier delivering 55mW into a 32Ω load.
The headphone amplifier can be configured for output capac-
itor-less (OCL) or single-ended (SE) mode. It integrates the
audio amplifiers, volume control, mixer, and power manage-
ment control all into a single package. In addition, the
LM49321 routes and mixes the single-ended stereo and dif-
ferential mono inputs into multiple distinct output modes. The
LM49321 features an I2S serial interface for full range audio
and an I2C or SPI compatible interface for control. The full
range music path features an SNR of 85dB with up to 192kHz
playback.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
Key Specifications
■ POUT LS, 8Ω, 3.3V, 1% THD+N
■ POUT HP, 32Ω, 3.3V, 1% THD+N
■ POUT Mono Earpiece, 32Ω
1% THD+N
■ Shutdown current
■ SNR (DAC + Amplifier)
520mW (typ)
36mW (typ)
55mW (typ)
0.6µA (typ)
85dB (typ)
Features
■ 18-bit stereo DAC with up to 192kHz sampling rate
■ Multiple distinct output modes
■ Mono class AB speaker amplifier
■ Stereo OCL/SE headphone amplifier
■ Mono earpiece amplifier
■ Differential mono analog input
■ Single-ended analog inputs
■ Independent loudspeaker, headphone and mono earpiece
volume controls
■ I2C/SPI (selectable) compatible interface
■ Ultra low shutdown current
■ Click and Pop Suppression circuit
Applications
■ Cell Phones
■ PDAs
■ Laptop computers
■ Portable devices
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 300618
www.national.com
1 page  
wwPwi.nDatDaSehesect4Uri.cpomtions
Pin Pin Name
A1 DGND
A2 MCLK
A3 I2S_WS
A4 SDA/SDI
A5 DVDD
A6 I/O_VDD
B1 PLL_VDD
B2 I2S_SDATA
B3 I2S_CLK
B4 GPIO
B5 I2C_VDD
B6 SDL/SCK
C1 PLL_GND
C2 PLL_OUT
C3 PLL_IN
C4 ADDR/ENB
C5 BYPASS
C6 AVDD
D1 AGND
D2 AGND
D3 NC
D4 MODE
D5 RHP
D6 CHP
E1 DIFF-
E2 LIN
E3 RIN
E4 NC
E5 LHP
E6 AGND
F1 DIFF+
F2 EP-
F3 EP+
F4 LS-
F5 AVDD
F6 LS+
Digital/
Analog
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
A
A
A
A
D
A
A
A
A
A
A
A
A
A
A
A
A
A
I/O, Power
P
I
I/O
I/O
P
P
P
I
I/O
O
P
I
P
O
I
I
I
P
P
P
I
O
O
I
I
I
O
P
I
O
O
O
P
O
Description
DIGITAL GND
MASTER CLOCK
I2S WORD SELECT
I2C SDA OR SPI SDI
DIGITAL SUPPLY VOLTAGE
I/O SUPPLY VOLTAGE
PLL SUPPLY VOLTAGE
I2S SERIAL DATA INPUT
I2S CLOCK SIGNAL
TEST PIN (MUST BE LEFT FLOATING)
I2C SUPPLY VOLTAGE
I2C_SCL OR SPI_SCK
PHASE LOCK LOOP GROUND
PHASE LOCK LOOP FILTER OUTPUT
PLL FILTER INPUT
I2C ADDRESS OR SPI ENB DEPENDING ON MODE
HALF-SUPPLY BYPASS
ANALOG SUPPLY VOLTAGE
ANALOG GROUND
ANALOG GROUND
NO CONNECT (MUST BE LEFT FLOATING)
SELECTS BETWEEN I2C OR SPI CONTROL
RIGHT HEADPHONE OUTPUT
HEADPHONE CENTER PIN OUTPUT (1/2 VDD or GND)
ANALOG NEGATIVE DIFFERENTIAL INPUT
ANALOG LEFT CHANNEL INPUT
ANALOG RIGHT CHANNEL INPUT
NO CONNECT (MUST BE LEFT FLOATING)
LEFT HEADPHONE OUTPUT
ANALOG GROUND
ANALOG POSITIVE DIFFERENTIAL INPUT
MONO EARPIECE- OUTPUT
MONO EARPIECE+ OUTPUT
LOUDSPEAKER OUTPUT-
ANALOG SUPPLY VOLTAGE
LOUDSPEAKER OUTPUT+
5 www.national.com
5 Page 
www.DataSheet4U.com
TABLE 1. Output Noise
Output Noise AVDD = 5.0V and AVDD = 3.0V. All gains set to 0dB. Units in μV, A-weighted, Inputs terminated to ground.
MODE
EP
LS HP OCL
Units
1 22 22
8
μV
2 22 22
8
μV
3 22 22
8
μV
4 68 88
46
μV
5 38 48
24
μV
6 29 34
18
μV
7 38 48
24
μV
TABLE 2. PSRR AVDD = 3.0V
PSRR AVDD = 3.0V, fRIPPLE = 217Hz; VRIPPLEe = 200mVP-P; CB = 2.2μF; All gains set to 0dB..
MODE
EP(Typ)
LS (Typ)
LS (Limit)
HP (Typ)
HP (Limit)
1 69 76
72
2 69 76 67 72 68
3 69 76
72
4 63 62
55
5 69 68
61
6 69 70
64
7 69 68
61
Units
dB
dB
dB
dB
dB
dB
dB
TABLE 3. PSRR AVDD = 5.0V
PSRR AVDD = 5.0V, fRIPPLE = 217Hz; VRIPPLE = 200mVP-P; CB = 2.2μF; All gains set to 0dB,
MODE
EP (Typ)
LS (Typ)
HP (Typ)
1 68 72
71
2 68 72
71
3 68 72
71
4 68 66
69
5 68 69
70
6 69 72
71
7 68 69
70
Units
dB
dB
dB
dB
dB
dB
dB
TABLE 4. Dynamic Range and SNR
Dynamic Range and SNR. 3.0V ≤ AVDD ≤ 5.0V. All programmable gain set to 0dB. Units in dB.
DR (Typ)
SNR (Typ)
LS 95
85
HP 95
85
EP 97
85
Units
dB
dB
dB
11 www.national.com
11 Page | ||
| Páginas | Total 42 Páginas | |
| PDF Descargar | [ Datasheet LM49321.PDF ] | |
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