TDA8559 Datasheet, PDF (4/32 Pages) NXP Semiconductors – Low-voltage stereo headphone amplifier

Philips Semiconductors
Low-voltage stereo headphone amplifier
Product specification
TDA8559
PINNING
SYMBOL
STANDBY
+IN1
−IN1
SVRR
+IN2
−IN2
MUTE
MODE
n.c.
n.c.
OUT2
BUFFER
GND
OUT1
V_P2
V_P1
PIN
DESCRIPTION
1 standby select
2 non-inverting input 1
3 inverting input 1
4 supply voltage ripple rejection
5 non-inverting input 2
6 inverting input 2
7 mute select
8 input mode select
9 not connected
10 not connected
11 output 2
12 buffer output (0.5V_P)
13 ground
14 output 1
15 high supply voltage
16 low supply voltage
handbook, halfpage
STANDBY 1
+IN1 2
−IN1 3
16 VP1
15 VP2
14 OUT1
SVRR 4
+IN2 5
13 GND
TDA8559
12 BUFFER
−IN2 6
11 OUT2
MUTE 7
10 n.c.
MODE 8
9 n.c.
MGD114
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
The TDA8559 contains two amplifiers with differential
inputs, a 0.5V_P output buffer and a high supply voltage
stabilizer. Each amplifier consists of a voltage-to-current
converter (V/I), an output amplifier and a common dynamic
quiescent current controller. The gain of each amplifier is
internally fixed at 26 dB (= 20 ×). The 0.5V_P output can be
used as a replacement for the single-ended capacitors.
The two amplifiers can also be used as a mono amplifier in
a BTL configuration thereby resulting in more output
power.
With three mode select pins, the device can be switched
into the following modes:
1. Standby mode (I_P < 10 µA)
2. Mute mode
3. Operation mode, with two input selections (the input
source is directly connected or connected via coupling
capacitors at the input).
The ripple rejection in the stereo application with a
single-ended capacitor can be improved by connecting a
capacitor between the 0.5V_P capacitor pin and ground.
The device is fully protected against short-circuiting of the
output pins to ground, to the low supply voltage pin and
across the load.
V/I converters
The V/I converters have a transconductance of 400 µS.
The inputs are completely symmetrical and the two
amplifiers can be used in opposite phase. The mute mode
causes the V/I converters to block the input signal.
The input mode pin selects two applications in which the
V/I converters can be used.
The first application (input mode pin floating) is used with
a supply voltage below 6 V. The input DC level is at ground
level (the unused input pin connected to ground) and no
input coupling capacitors are necessary. The maximum
converter output current is sufficient to obtain an output
swing of 3 V (peak).
In the second application with a supply voltage greater
than 6 V (input mode pin HIGH), the input mode pin is
connected to V_P. In this configuration (input DC
level = 0.5V_P + 0.6 V) the input source must be coupled
with a capacitor and the two unused input pins must be
connected via a capacitor to ground, to improve noise
performance. This application has a higher quiescent
current, because the maximum output current of the V/I
converter is higher to obtain an output voltage swing of
9 V (peak).
1997 Jun 27
4