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LM48822 Datasheet(PDF) 11 Page - Texas Instruments

Part # LM48822
Description  Ground-Referenced, Ultra High PSRR, Ultra Low Noise, 35mW/Channel Stereo Headphone Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM48822 Datasheet(HTML) 11 Page - Texas Instruments

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START
MSB
DEVICE ADDRESS
LSB
ACK
SCL
SDA
STOP
MSB
REGISTER DATA
LSB
ACK
R/W
LM48822, LM48822TLEVAL
www.ti.com
SNAS456B – MAY 2008 – REVISED MARCH 2011
Figure 6. Example I2C Write Cycle
Table 2. Device Address
B7
B6
B5
B4
B3
B2
B1
B0 (R/W)
Device
1
1
0
0
0
0
0
0
Address
Table 3. I2C Control Registers
Register
Register
B7
B6
B5
B4
B3
B2
B1
B0
Address
Name
MODE
MUTE_
MUTE_
0
0
SDL
SD_BIAS
CP_ONLY
0
SDR
CONTROL
LEFT
RIGHT
VOLUME
1
1
SHDN
VOL5
VOL4
VOL3
VOL2
VOL1
VOL0
CONTROL
Table 4. Mode Control Register
Bit
Name
Value
Description
0
Left channel enabled
B6
SDL
1
Left channel disabled
0
Bias enabled
B5
SD_BIAS
1
Bias disabled
0
Normal operation
B4
CP_ONLY
1
Charge-pump only mode. Amplifiers and Bias disabled.
B3
UNUSED
0
Set B3 to 0
0
Left channel Normal Operation
B2
MUTE_LEFT
1
Left channel Mute
0
Right channel enabled
B1
SDR
Right channel disabled. Right channel audio inputs summed with
1
left channel audio inputs and routed to OUTL
0
Right channel Normal Operation
B0
MUTE_RIGHT
1
Right channel Mute
GENERAL AMPLIFIER FUNCTION
The LM48822 headphone amplifier feature National’s ground referenced architecture that eliminates the large
DC-blocking capacitors required at the outputs of traditional headphone amplifiers. A low-noise inverting charge
pump creates a negative supply (CPVSS) from the positive supply voltage (VDD). The headphone amplifiers
operate from these bipolar supplies, with the amplifier outputs biased about GND, instead of a nominal DC
voltage (typically VDD/2), like traditional amplifiers. Because there is no DC component to the headphone output
signals, the large DC-blocking capacitors (typically 220
μF) are not necessary, conserving board space and
system cost, while improving frequency response.
Copyright © 2008–2011, Texas Instruments Incorporated
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Product Folder Links: LM48822 LM48822TLEVAL


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