TDA8954 NXP Semiconductors, TDA8954 Datasheet - Page 5

• Manufacturer Part Number: TDA8954
• Description: The TDA8954 is a stereo or mono high–efficiency Class D audio power amplifier in asingle IC featuring low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
8. Functional description
TDA8954_1
Product data sheet
7.2 Pin description
8.1 General
Table 3.
The TDA8954 is a two-channel audio power amplifier that uses Class D technology.
For each channel, the audio input signal is converted into a digital Pulse Width Modulation
(PWM) signal using an analog input stage and a PWM modulator; see
the output power transistors, the digital PWM signal is fed to a control and handshake
block and to high- and low-side driver circuits. This level-shifts the low-power digital PWM
signal from a logic level to a high-power PWM signal switching between the main supply
lines.
A second-order low-pass filter converts the PWM signal to an analog audio signal that can
be used to drive a loudspeaker.
Symbol
VSSA
SGND
VDDA
IN2M
IN2P
MODE
OSC
IN1P
IN1M
DIAG1
OSCREF
DIAG2
PROT
VDDP1
BOOT1
OUT1
VSSP1
STABI
n.c.
VSSP2
OUT2
BOOT2
VDDP2
VSSA
Pin description
Pin
TDA8954TH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Rev. 01 — 24 December 2009
TDA8954J
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
10
11
12
17
13
14
15
16
-
Description
negative analog supply voltage
signal ground
positive analog supply voltage
channel 2 negative audio input
channel 2 positive audio input
mode selection input: Standby, Mute or Operating
mode
oscillator frequency adjustment or tracking input
channel 1 positive audio input
channel 1 negative audio input
diagnostic output 1 (open drain; TFB)
reference for OSC pin
diagnostic output 2 (open drain; protection functions)
decoupling capacitor for protection (OCP)
channel 1 positive power supply voltage
channel 1 bootstrap capacitor
channel 1 PWM output
channel 1 negative power supply voltage
decoupling of internal stabilizer for logic supply
not connected
channel 2 negative power supply voltage
channel 2 PWM output
channel 2 bootstrap capacitor
channel 2 positive power supply voltage
negative analog supply voltage
2 × 210 W class-D power amplifier
TDA8954
Figure
© NXP B.V. 2009. All rights reserved.
1. To drive
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