lm48823tlx National Semiconductor Corporation, lm48823tlx Datasheet - Page 11

• Manufacturer Part Number: lm48823tlx
• Description: Mono, Bridge-tied Load, Ceramic Speaker Driver With I2c Volume Control And Reset
• Manufacturer: National Semiconductor Corporation

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FIGURE 4. Example Write Sequence
TABLE 2. Device Address
B7
B6
B5
B4
B3
B2
B1
B0 R/W
Chip Address
1
1
1
0
1
1
0
0
TABLE 3. 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 National’s inverting charge pump technology to deliver over 15V
to a
P-P
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 5 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 6.
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FIGURE 5. Stereo to Mono Conversion Connection Example
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FIGURE 6. Mono Audio Source Connection Example
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