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PDF LM4946 Data sheet ( Hoja de datos )
| Número de pieza | LM4946 | |
| Descripción | Output Capacitor Less Audio Subsystem | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 2006
LM4946
Output Capacitor-Less Audio Subsystem with
Programmable National 3D
General Description
The LM4946 is an audio power amplifier capable of deliver-
ing 540mW of continuous average power into a mono 8Ω
bridged-tied load (BTL) with 1% THD+N, 35mW per channel
of continuous average power into stereo 32Ω single-ended
(SE) loads with 1% THD+N, or an output capacitor-less
(OCL) configuration with identical specifications as the SE
configuration, from a 3.3V power supply.
The LM4946 has three input channels: one pair for a two-
channel stereo signal and the third for a differential single-
channel mono input. The LM4946 features a 32-step digital
volume control and eight distinct output modes. The digital
volume control, 3D enhancement, and output modes (mono/
SE/OCL) are programmed through a two-wire I2C or a three-
wire SPI compatible interface that allows flexibility in routing
and mixing audio channels.
The LM4946 is designed for cellular phone, PDA, and other
portable handheld applications. It delivers high quality output
power from a surface-mount package and requires only
seven external components in the OCL mode (two additional
components in SE mode).
Key Specifications
j THD+N at 1kHz, 540mW
into 8Ω BTL (3.3V)
j THD+N at 1kHz, 35mW
into 32Ω SE (3.3V)
j Single Supply Operation (VDD)
j I2C/SPI Single Supply Operation
1.0% (typ)
1.0% (typ)
2.7 to 5.5V
2.2 to 5.5V
Features
n I2C/SPI Control Interface
n I2C/SPI programmable National 3D Audio
n I2C/SPI controlled 32 step digital volume control (-54dB
to +18dB)
n Three independent volume channels (Left, Right, Mono)
n Eight distinct output modes
n LLP surface mount packaging
n “Click and Pop” suppression circuitry
n Thermal shutdown protection
n Low shutdown current (0.02uA, typ)
n RF immunity topology
Applications
n Mobile Phones
n PDAs
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201628
DataSheet4 U .com
www.national.com
1 page  
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Electrical Characteristics 3.3V (Notes 2, 7) (Continued)
The following specifications apply for VDD = 3.3V, TA = 25˚C, all volume controls set to 0dB, unless otherwise specified.
Symbol
Parameter
Conditions
LM4946
Units
Typical Limits
(Limits)
(Note 4) (Note 5)
A-weighted,
inputs terminated to GND, output referred
Speaker; Mode 1
17 µV
Speaker; Mode 3, 7
27 µV
Speaker; Mode 5
33 µV
NOUT
Output Noise
Headphone; SE, Mode 2
Headphone; SE, Mode 4, 7
8
8
µV
µV
Headphone; SE, Mode 6
12
µV
Headphone; OCL, Mode 2
8
µV
Headphone; OCL, Mode 4, 7
9
µV
Headphone; OCL, Mode 6
12
µV
Power Supply Rejection Ratio
MONOOUT
VRIPPLE = 200mVPP; f = 217Hz, RL = 8Ω
CB = 2.2µF, BTL
All audio inputs terminated to GND;
output referred
BTL, Output Mode 1
76
dB
BTL, Output Mode 3, 7
65 dB
BTL, Output Mode 5
63 dB
PSRR
VRIPPLE = 200mVPP; f = 217Hz, RL = 32Ω
CB = 2.2µF,
All audio inputs terminated to GND
output referred
Power Supply Rejection Ratio
ROUT and LOUT
SE, Output Mode 2
SE, Output Mode 4,7
SE, Output Mode 6
78 dB
82 dB
78 dB
OCL, Output Mode 2
84 dB
OCL, Output Mode 4, 7
78 dB
OCL, Output Mode 6
77 dB
Volume Control Step Size Error
±0.2
dB
Digital Volume Control Range
Maximum attenuation
Maximum gain
–56 dB (max)
-54
–52 dB (min)
17.4
dB (min)
18
18.6
dB (max)
HP(SE) Mute Attenuation
Output Mode 1, 3, 5
96 dB
MONO_IN Input Impedance
Maximum gain setting
10 kΩ (min)
12.5 15 kΩ (max)
RIN and LIN Input Impedance
Maximum attenuation setting
90 kΩ (min)
110 130 kΩ (max)
CMRR Common-Mode Rejection Ratio
XTALK Crosstalk
f = 217Hz, VCM = 1Vpp,
Mode 1, BTL, RL = 8Ω
f = 217Hz, VCM = 1Vpp,
Mode 2, RL = 32Ω
Headphone; PO = 12mW
f = 1kHz, OCL, mode 4
Headphone; PO = 12mW
f = 1kHz, SE, mode 4
61
66
–54
–72
dB
dB
dB
TWU
Wake-Up Time from Shutdown
CB = 2.2µF, OCL
CB = 2.2µF, SE
100 ms
135 ms
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Typical Performance Characteristics (Continued)
THD+N vs Frequency
VDD = 3.3V, RL = 32Ω, PO = 12mW
Mode 2, OCL
THD+N vs Frequency
VDD = 3.3V, RL = 32Ω, PO = 12mW
Mode 2, SE
201628M3
THD+N vs Frequency
VDD = 3.3V, RL = 8Ω
Mode 3, BTL
201628M4
THD+N vs Output Power
VDD = 3.3V, RL = 8Ω, f = 1kHz
Mode 1, BTL
201628M5
THD+N vs Output Power
VDD = 3.3V, RL = 8Ω, f = 1kHz
Mode 5, BTL
201628B0
THD+N vs Output Power
VDD = 3.3V, RL = 32Ω, f = 1kHz
Mode 4, 7, OCL
DataSheet4 U .com
201628B4
11
201628E6
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| PDF Descargar | [ Datasheet LM4946.PDF ] | |
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