LM48557TL/NOPB National Semiconductor, LM48557TL/NOPB Datasheet - Page 13

IC AMP AUDIO PWR MONO AB 16USMD

LM48557TL/NOPB

Manufacturer Part Number
LM48557TL/NOPB
Description
IC AMP AUDIO PWR MONO AB 16USMD
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM48557TL/NOPB

Output Type
1-Channel (Mono)
Voltage - Supply
2.7 V ~ 4.5 V
Features
Depop, Differential Inputs, I²C, Mute, Shutdown, Volume Control
Mounting Type
Surface Mount
Package / Case
16-MicroSMD
Operational Class
Class-AB
Audio Amplifier Output Configuration
1-Channel Mono
Audio Amplifier Function
Speaker
Single Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (typ)
3V
Power Supply Requirement
Dual
Rail/rail I/o Type
No
Power Supply Rejection Ratio
80dB
Single Supply Voltage (min)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Dual Supply Voltage (min)
1.7/2.7V
Dual Supply Voltage (max)
4.5V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
16
Package Type
uSMD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Max Output Power X Channels @ Load
-
Lead Free Status / Rohs Status
Compliant
Other names
LM48557TLTR
SINGLE AND MULTI-BYTE WRITE OPERATION
The LM48557 supports both single-byte and multi-byte write
operations. A single-byte write operation begins with the mas-
ter device transmitting a START condition followed by the
device address (Figure 7). After receiving the correct device
address, the LM48557 generates an ACK bit. The master de-
vice transmits the register data byte, after which the LM48557
generates and ACK bit. Following the ACK, the master issues
a STOP condition, completing the singly-byte data transfer.
A multi-byte write operation is similar to a single-byte opera-
tion, the master device issues a START condition and device
GENERAL AMPLIFIER FUNCTION
The LM48557 is a fully differential ceramic speaker driver that
utilizes National’s inverting charge pump technology to deliv-
er over 5.8V
from a single 4.2V supply. The low noise, inverting charge
pump generates a negative supply voltage (CPV
RMS
to a 1µF ceramic speaker while operating
FIGURE 7. Single-Byte Write Example
FIGURE 8. Multi-Byte Write Example
SS
) from the
13
address, and the LM48557 responds with an ACK (Figure 8).
The master device then transmits the first data byte. Following
the LM48557’s ACK, the master device does not issue a
STOP condition, transmitting a second data byte instead. The
LM48557 responds with an ACK bit. The master device can
continue to issue data bytes, and the LM48557 will respond
with an ACK, until a STOP condition is issued. Once a STOP
condition is issued, the LM48557 ignores the I
master issues the LM48557’s device address.
positive supply voltage (PV
tage of the increased head room created by the charge pump
and the bridge-tied load (BTL) architecture, delivering signif-
icantly more voltage than a single-ended, single-supply am-
plifier to the speaker.
DD
). The LM48557 takes advan-
2
C bus until the
30098109
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30098105

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