TDF8590TH_2 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 02 — 23 April 2007 3 of 30
NXP Semiconductors
TDF8590TH
2 × 80 W SE (4 Ω) or 1 × 160 W BTL (8 Ω) class-D amplifier
5.2 Pin description
[1] The heatsink is internally connected to pin V
SSD
.
6. Functional description
6.1 Introduction
The TDF8590TH is a dual channel audio power amplifier using class-D technology. The
audio input signal is converted into a Pulse Width Modulated (PWM) signal via an analog
input stage and PWM modulator. To enable the output power transistors to be driven, this
digital PWM signal is applied to a control and handshake block and driver circuits for both
the high-side and low-side. An external 2nd-order low-pass filter converts the PWM output
signal to an analog audio signal across the loudspeakers.
Table 2. Pin description
Symbol Pin Description
V
SSA2
1 negative analog supply voltage for channel 2
SGND2 2 signal ground for channel 2
V
DDA2
3 positive analog supply voltage for channel 2
IN2M 4 negative audio input for channel 2
IN2P 5 positive audio input for channel 2
MODE 6 mode selection input: standby, mute or operating
OSC 7 oscillator frequency adjustment or tracking input
IN1P 8 positive audio input for channel 1
IN1M 9 negative audio input for channel 1
V
DDA1
10 positive analog supply voltage for channel 1
SGND1 11 signal ground for channel 1
V
SSA1
12 negative analog supply voltage for channel 1
DIAG 13 diagnostic for activated current protection
V
DDP1
14 positive power supply voltage for channel 1
BOOT1 15 bootstrap capacitor for channel 1
OUT1 16 PWM output from channel 1
V
SSP1
17 negative power supply voltage for channel 1
STABI 18 decoupling of internal stabilizer for logic supply
n.c. 19 not connected
V
SSP2
20 negative power supply voltage for channel 2
OUT2 21 PWM output from channel 2
BOOT2 22 bootstrap capacitor for channel 2
V
DDP2
23 positive power supply voltage for channel 2
V
SSD
24 negative digital supply voltage
[1]
