START

MSB

DEVICE ADDRESS

LSB

ACK

SCL

SDA

STOP

MSB

REGISTER DATA

LSB

ACK

R/W

LM48822, LM48822TLEVAL

SNAS456C – MAY 2008 – REVISED MAY 2013

www.ti.com

Table 1. Device Address

B7

B6

B5

B4

B3

B2

B1

B0 (R/W)

Device

1

1

0

0

0

0

0

0

Address

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 3. 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 TI’s ground referenced architecture that eliminates the large DC-

blocking capacitors required at the outputs of traditional headphone amplifiers. A low-noise inverting charge

operate from these bipolar supplies, with the amplifier outputs biased about GND, instead of a nominal DC

signals, the large DC-blocking capacitors (typically 220

μF) are not necessary, conserving board space and

system cost, while improving frequency response.

10

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