VOLUME

CONTROL

OUTA

CIN

VOLUME

CONTROL

OUTB

CIN

MONO AUDIO SIGNAL

INA

INB

VOLUME

CONTROL

OUTA

CIN

VOLUME

CONTROL

OUTB

CIN

RIGHT CHANNEL AUDIO

SIGNAL

LEFT CHANNEL AUDIO

SIGNAL

INA

INB

START

MSB

DEVICE ADDRESS

LSB

ACK

SCL

SDA

STOP

MSB

REGISTER DATA

LSB

ACK

R/W

LM48823, LM48823TLEVAL

www.ti.com

SNAS464E – JUNE 2008 – REVISED OCTOBER 2010

Figure 20. Example Write Sequence

Table 1. Device Address

B7

B6

B5

B4

B3

B2

B1

B0 R/W

Chip Address

1

1

1

0

1

1

0

0

Table 2. Mode Control Registers

Register Name

B7

B6

B5

B4

B3

B2

B1

B0

Mode Control

VOL4

VOL3

VOL2

VOL1

VOL0

0

ENABLE_A

ENABLE_B

GENERAL AMPLIFIER FUNCTION

The LM48823 is a ceramic speaker driver that utilizes TI’s inverting charge pump technology to deliver over

15VP-P to a 2.2µF ceramic speaker while operating from a single 4.2V supply. The LM48823 features a unique

input stage that converts two single-ended audio signals into a mono BTL output. This stereo to mono conversion

is useful in applications where a stereo audio source is driving a single ceramic speaker, such as a ringer on a

cellular phone. Connect INA and INB as shown in Figure 21 for the stereo-to-mono conversion. When the

LM48823 is used with a single-ended mono audio source, connect both INA and INB to the audio source as

shown in Figure 22.

Figure 21. Stereo to Mono Conversion Connection Example

Figure 22. Mono Audio Source Connection Example

Copyright © 2008–2010, Texas Instruments Incorporated

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Product Folder Links: LM48823 LM48823TLEVAL