TDA8559 Philips Semiconductors, TDA8559 Datasheet - Page 4

• Manufacturer Part Number: TDA8559
• Description: Low-voltage stereo headphone amplifier
• Manufacturer: Philips Semiconductors

Philips Semiconductors
PINNING
FUNCTIONAL DESCRIPTION
The TDA8559 contains two amplifiers with differential
inputs, a 0.5V
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
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
2. Mute mode
3. Operation mode, with two input selections (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
The device is fully protected against short-circuiting of the
output pins to ground, to the low supply voltage pin and
across the load.
1997 Jun 27
STANDBY
+IN1
SVRR
+IN2
MUTE
MODE
n.c.
n.c.
OUT2
BUFFER
GND
OUT1
V
V
IN1
IN2
P2
P1
Low-voltage stereo headphone amplifier
SYMBOL
source is directly connected or connected via coupling
capacitors at the input).
P
output buffer and a high supply voltage
PIN
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
P
< 10 A)
standby select
non-inverting input 1
inverting input 1
supply voltage ripple rejection
non-inverting input 2
inverting input 2
mute select
input mode select
not connected
not connected
output 2
buffer output (0.5V
ground
output 1
high supply voltage
low supply voltage
P
capacitor pin and ground.
DESCRIPTION
P
output can be
P
)
4
V/I converters
The V/I converters have a transconductance of 400 S.
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
level = 0.5V
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).
handbook, halfpage
STANDBY
P
MODE
+ 0.6 V) the input source must be coupled
MUTE
SVRR
P
IN1
IN1
IN2
IN2
. In this configuration (input DC
Fig.2 Pin configuration.
1
2
3
4
5
6
7
8
TDA8559
MGD114
16
15
14
13
12
11
10
9
Product specification
V P1
V P2
OUT1
GND
BUFFER
OUT2
n.c.
n.c.
TDA8559