Philips TDA8559T Operation manual

1. General description
The TDA8559T is a stereo amplifier that operates over a wide supply voltage range from
1.9 V to 30 V and consumes a very low quiescent current. This makes it suitable for
battery fed applications (2 ×1.5 V cells). Because of an internal voltage buffer, this device
can be used with or without a capacitor connected in series with the load. It can be
applied as a headphone amplifier, but also as a mono amplifier with a small speaker
(25 Ω), or as a line driver in mains applications.
2. Features
nOperating voltage from 1.9 V to 30 V
nVery low quiescent current
nLow distortion
nFew external components
nDifferential inputs
nUsable as a mono amplifier in Bridge-Tied Load (BTL) or stereo Single-Ended (SE)
nSingle-ended mode without loudspeaker capacitor
nMute and Standby mode
nShort-circuit proof to ground, to supply voltage (< 10 V) and across load
nNo switch on or switch off clicks
nESD protected on all pins
3. Applications
nPortable telephones
nMP3 players
nPortable audio
nMains fed equipment
TDA8559T
Low-voltage stereo headphone amplifier
Rev. 03 — 15 May 2006 Product data sheets

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Product data sheets Rev. 03 — 15 May 2006 2 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
4. Quick reference data
[1] Measured with low-pass filter 30 kHz.
5. Ordering information
Table 1. Quick reference data
Symbol Parameter Conditions Min Typ Max Unit
Supplies
VPoperating supply voltage 1.9 3 30 V
Iq(tot) total quiescent current open load - 2.75 4 mA
Istb standby supply current open load - - 10 µA
Stereo application
Pooutput power THD = 10 % 30 35 - mW
THD total harmonic distortion Po= 20 mW;
fi= 1 kHz [1] - 0.075 0.15 %
Po= 20 mW;
fi=10kHz [1] - 0.1 - %
Gvvoltage gain 25 26 27 dB
fss small signal roll-off
frequency −1 dB - 750 - kHz
BTL application
Pooutput power THD = 10 % 125 140 - mW
THD total harmonic distortion Po= 70 mW;
fi= 1 kHz - 0.05 0.1 %
Po= 70 mW;
fi=10kHz - 0.1 - %
Gvvoltage gain 31 32 33 dB
Table 2. Ordering information
Type number Package
Name Description Version
TDA8559T SO16 plastic small outline package; 16 leads; body width 3.9 mm; body thickness
1.47 mm SOT109-1

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Product data sheets Rev. 03 — 15 May 2006 3 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
6. Block diagram
Fig 1. Block diagram
+
−
+
−
+
−
+
−
OA
INPUT
LOGIC
V/I
REFERENCE
V/I
1
STANDBY
+IN1
−IN1
+IN2
−IN2
MUTE
MODE
SVRR
n.c. GND
2
3
5
6
412 BUFFER
OUT2
OUT1
mgd115
11
14
1615
139,10
7
8
VP
VP
VP1 VP2
BUFFER
OA
50 kΩ
100 kΩ
100
kΩ
50 kΩ
50 kΩ
50 kΩ
50
kΩ
50
kΩ
TDA8559T
DQC

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Product data sheets Rev. 03 — 15 May 2006 4 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
7. Pinning information
7.1 Pinning
7.2 Pin description
Top view
Fig 2. Pin configuration
TDA8559T
STANDBY VP1
+IN1 VP2
−IN1 OUT1
SVRR GND
+IN2 BUFFER
−IN2 OUT2
MUTE n.c.
MODE n.c.
001aae802
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
Table 3. Pin description
Symbol Pin Description
STANDBY 1 standby select
+IN1 2 non-inverting input 1
−IN1 3 inverting input 1
SVRR 4 supply voltage ripple rejection
+IN2 5 non-inverting input 2
−IN2 6 inverting input 2
MUTE 7 mute select
MODE 8 input mode select
n.c. 9 not connected
n.c. 10 not connected
OUT2 11 output 2
BUFFER 12 buffer output (0.5VP)
GND 13 ground
OUT1 14 output 1
VP2 15 high supply voltage
VP1 16 low supply voltage

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Product data sheets Rev. 03 — 15 May 2006 5 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
8. Functional description
The TDA8559T contains two amplifiers with differential inputs, a 0.5VPoutput 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 0.5VPoutput 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 (IP<10µA)
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 0.5VPcapacitor 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.
8.1 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 VP. In this configuration (input DC level is
0.5VP+ 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).
8.2 Output amplifiers
The output amplifiers have a transresistance of 50 kΩ, a bandwidth of approximately
750 kHz and a maximum output current of 100 mA. The mid-tap output voltage equals the
voltage applied at the non-inverting pin of the output amplifier. This pin is connected to the
output of the 0.5VPbuffer. This reduces the distortion when the load is connected
between an output amplifier and the buffer (because feedback is applied over the load).
8.3 Buffer
The buffer delivers 0.5VPto the output with a maximum output (sink and source) current of
200 mA (peak).

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Product data sheets Rev. 03 — 15 May 2006 6 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
8.4 Dynamic quiescent controller
The Dynamic Quiescent Current controller (DQC) gives the advantage of low quiescent
current and low distortion. When there are high frequencies in the output signal, the DQC
will increase the quiescent current of the two output amplifiers and the buffer. This will
reduce the crossover distortion that normally occurs at high frequencies and low
quiescent current. The DQC gives output currents that are linear with the amplitude and
the frequency of the output signals. These currents control the quiescent current.
8.5 Stabilizer
The TDA8559T has a voltage supply range from 1.9 V to 30 V. This range is divided over
two supply voltage pins. Pin 16 is 1.9 V to 18 V (breakdown voltage of the process); this
pin is preferred for supply voltages less than 18 V. Pin 15 is used for applications where
VPis approximately 6 V to 30 V. The stabilizer output is internally connected to the supply
voltage pin 16. In the range from 6 V to 18 V, the voltage drop to pin 16 is 1 V. In the range
from 18 V to 30 V the stabilizer output voltage (to pin 16) is approximately 17 V.
8.6 Input logic
The MUTE pin (pin 7) selects the Mute mode of the V/I converters. LOW (TTL/CMOS)
level is mute. A voltage between 0.5 V (low level) and 1.5 V (high level) causes a soft mute
to operate (no plops). When pin 7 is floating or greater than 1.5 V it is in the operating
condition.
The input mode pin must be connected to VPwhen the supply voltage is greater than 6 V.
The input mode logic raises the tail current of the V/I converters and enables the two
buffers to bias the inputs of the V/I converters.
8.7 Reference
This circuit supplies all currents needed in this device. With the Standby mode pin 1
(TTL/CMOS), it is possible to switch to the Standby mode and reduce the total quiescent
current to below 10 µA.

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Product data sheets Rev. 03 — 15 May 2006 7 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
9. Internal circuitry
Table 4. Internal circuits
Symbol Pin Equivalent circuit
STANDBY 1
+IN1, −IN1, +IN2
and −IN2 2, 3, 5 and 6
SVRR 4
VP1
10 kΩ
12
kΩ
mgd110
VP1
mgd106
50
kΩ
VP1
mgd107
50
kΩ
50
kΩ
50
kΩ

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Product data sheets Rev. 03 — 15 May 2006 8 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
MUTE 7
MODE 8
Table 4. Internal circuits
…continued
Symbol Pin Equivalent circuit
VP1
mgd112
VP1
mgd113
1 kΩ
5 kΩ
250
kΩ

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Product data sheets Rev. 03 — 15 May 2006 9 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
OUT2 and OUT1 11 and 14
BUFFER 12
VP2 and VP1 15 and 16
Table 4. Internal circuits
…continued
Symbol Pin Equivalent circuit
VP1
buffer output
100 Ω
50 Ω
mgd108
VP1
buffer output
mgd109
VP2 VP1
mgd111
2 kΩ

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Product data sheets Rev. 03 — 15 May 2006 10 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
10. Limiting values
11. Thermal characteristics
12. Characteristics
Table 5. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
VP2(max) maximum supply voltage (pin 15) - 30 V
VP1(max) maximum supply voltage (pin 16) - 18 V
Vi(max) maximum input voltage - 18 V
IORM peak output current repetitive - 150 mA
Ptot total power dissipation - 1.19 W
Tamb ambient temperature −40 +85 °C
Tstg storage temperature −55 +150 °C
Tvj virtual junction temperature - 150 °C
tsc short-circuiting time VP<10V - 1 h
Table 6. Thermal characteristics
Symbol Parameter Conditions Typ Unit
Rth(j-a) thermal resistance from junction to ambient in free air 105 K/W
Table 7. Characteristics
V
P
= 3 V; T
amb
= 25 ° C; f
i
= 1 kHz; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
DC characteristics
VPoperating supply voltage [1] 1.9 3 30 V
Iq(tot) total quiescent current open load - 2.75 4 mA
Istb standby supply current open load - - 10 µA
V1Standby mode voltage standby 0 - 0.5 V
operating 1.5 - 18 V
V7Mute mode voltage mute 0 - 0.5 V
operating 1.5 - 18 V
Ibias input bias current - 100 300 nA
Single-ended stereo application (RL= 32 Ω)
Pooutput power THD = 10 % 30 35 - mW
THD total harmonic distortion Po= 20 mW; fi= 1 kHz [2] - 0.075 0.15 %
Po= 20 mW; fi=10kHz [2] - 0.1 - %
Gvvoltage gain 25 26 27 dB
fss small signal roll-off
frequency −1 dB - 750 - kHz
αcs channel separation Rs= 5 kΩ40--dB
∆Gvchannel unbalance - - 1 dB

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Product data sheets Rev. 03 — 15 May 2006 11 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
[1] The supply voltage range at pin VP1 is from 1.9 V to 18 V. Pin VP2 is used for the voltage range from 6 V to 30 V.
[2] Measured with low-pass filter 30 kHz.
[3] Noise output voltage measured with a bandwidth of 20 Hz to 20 kHz, unweighted. Rs=5kΩ.
[4] RMS output voltage in mute is measured with Vi= 200 mV (RMS); f = 1 kHz.
[5] DC output offset voltage is measured between the signal output and the 0.5VPoutput.
[6] The ripple rejection is measured with a ripple voltage of 200 mV (RMS) applied to the positive supply rail (Rs=0kΩ).
[7] DC output offset voltage is measured between the two signal outputs.
13. Application information
13.1 General
For applications with a maximum supply voltage of 6 V (input mode low) the input pins
need a DC path to ground (see Figure 3 and Figure 4). For applications with supply
voltages in the range from 6 V to 18 V (input mode HIGH) the input DC level is
0.5VP+ 0.6 V. In this situation the input configurations illustrated in Figure 5 and Figure 6
have to be used.
Vno noise output voltage [3] -7085µV
Vno(mute) noise output voltage in
mute [3] -2030µV
Vo(mute) output voltage in mute [4] --30µV
Vmt mid-tap voltage 1.4 1.5 1.6 V
Ziinput impedance 75 100 125 kΩ
Vos DC output offset voltage [5] - - 100 mV
SVRR supply voltage ripple
rejection [6] 45 55 - dB
BTL application (RL= 25 Ω)
Pooutput power THD = 10 % 125 140 - mW
THD total harmonic distortion Po= 70 mW; fi= 1 kHz - 0.05 0.1 %
Po= 70 mW; fi= 10 kHz - 0.1 - %
Gvvoltage gain 31 32 33 dB
fss small signal roll-off
frequency −1 dB - 750 - kHz
Vno noise output voltage [3] - 100 120 µV
Vno(mute) noise output voltage in
mute [3] -2540µV
Vo(mute) output voltage in mute [4] --40µV
Ziinput impedance 39 50 61 kΩ
Vos DC output offset voltage [7] - - 150 mV
SVRR supply voltage ripple
rejection [6] 39 49 - dB
Line driver application (RL= 1 kΩ)
Voline output voltage 0.1 - 2.9 V
Table 7. Characteristics …continued
V
P
= 3 V; T
amb
= 25 ° C; f
i
= 1 kHz; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit

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Product data sheets Rev. 03 — 15 May 2006 12 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
The capacitor Cb is recommended for stability improvement. The value may vary between
10 nF and 100 nF. This capacitor should be placed close to the IC between pin 12 and
pin 13.
13.2 Heatsink design
The standard application is stereo headphone single-ended with a 32 Ωload impedance
to buffer (see Figure 9). The headphone amplifier can deliver a peak output current of
150 mA into the load.
For the SO16 envelope Rth(j-a) = 105 K/W; the maximum sinewave power dissipation for
Tamb =25°C is:
For Tamb =60°C the maximum total power dissipation is:
13.3 Test conditions
Tamb =25°C; unless otherwise specified: VP= 3 V, f = 1 kHz, RL=32Ω, Gain = 26 dB,
low input mode, band-pass filter: 22 Hz to 30 kHz. The total harmonic distortion as a
function of frequency was measured with low-pass filter of 80 kHz. The quiescent current
has been measured without any load impedance.
In applications with coupling capacitors towards the load, an electrolytic capacitor has to
be connected to pin 4 (SVRR).
1. The graphs for the single-ended application have been measured with the application
illustrated in Figure 9; input configuration for input mode low (Figure 4) and input
configuration for input mode high (Figure 6).
2. The graphs for the BTL application ‘input mode low’ have been measured with the
application circuit illustrated in Figure 11 and the input configuration illustrated in
Figure 4.
3. The graphs for the line-driver application have been measured with the application
circuit illustrated in Figure 13 and the input configuration illustrated in Figure 6; input
mode high.
1.2 W150 25–
105
---------------------
=
0.85 W 150 60–
105
---------------------
=

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Product data sheets Rev. 03 — 15 May 2006 13 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
13.4 Input configurations
The IC can be applied in two ways, ‘input mode low’ and ‘input mode high’. This can be
selected by the input mode at pin 8:
1. Input mode low: pin 8 floating: The DC level of the input pins has to be between 0 V
and (VP−1.8 V). A DC path to ground is needed. The maximum output voltage is
approximately 2.1 V (RMS). Input configurations illustrated in Figure 3 and Figure 4
should be used.
2. Input mode high: pin 8 is connected to VP: This mode is intended for supply voltages
> 6 V. It can deliver a maximum output voltage of approximately 6 V (RMS) at
THD = 0.5 %. The DC voltage level of the input pins is (0.5VP+ 0.6 V). Coupling
capacitors are necessary. Input configurations illustrated in Figure 5 and Figure 6
should be used.
VP<6 V. VP<6 V.
Fig 3. Input configuration; with input capacitor Fig 4. Input configuration; without input capacitor
2.2 µF
VIN
mgd123
5 kΩINPUT
pins 2 and 5
pins 3 and 6
VIN
mgd124
INPUT
pins 2 and 5
pins 3 and 6
VP<6 V. At VP<6 V, combined negative inputs.
Fig 5. Input configuration Fig 6. Input configuration
220 nF
VIN
mgd125
220 nF INPUT
pins 2 and 5
pins 3 and 6
220
nF
100 nF
100 nF
VIN
VIN
mgd126
pin 2
pin 3
pin 6
pin 5
Fig 7. Soft mute
VP
7
mute
620 kΩ
47 kΩ220 nF
mgl135

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Product data sheets Rev. 03 — 15 May 2006 14 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
13.5 Standby/mute
1. The Standby mode (V1< 0.5 V) is intended for power saving purpose. Then the total
quiescent current is < 10 µA.
2. To avoid ‘pop-noise’ during switch-on or switch-off the IC can be muted (V7< 0.5 V).
This can be achieved by a ‘soft-mute’ circuit or by direct control from a microcontroller.
13.6 Application 1: SE with loudspeaker capacitor
The value of capacitor Cr influences the behavior of the Supply Voltage Ripple Rejection
(SVRR) at low frequencies; increasing the value of Cr increases the performance of the
SVRR; see Figure 8.
13.7 Application 2: SE to buffer (without loudspeaker capacitor)
This is the basic headphone application. The advantage of this application with respect to
application 1, is that it needs only one external component (Cb) in the event of stability
problems; see Figure 9.
13.8 Application 3: Improved SE to buffer (without loudspeaker capacitor)
This application is an improved configuration of application 2. The distinction between the
two is connecting the loads in opposite phase. This lowers the average current through
the SE buffer. It should be noted that a headphone cannot be used because the load
requires floating terminals; see Figure 10.
13.9 Application 4: Bridge tied load mono amplifier
This configuration delivers four times the output power of the SE application with the same
supply and load conditions. The capacitor Cr is not required; see Figure 11.
13.10 Application 5: Line driver application
The TDA8559T delivers a virtual rail-to-rail output voltage and is also usable in a low
voltage environment, as a line driver. In this application the input needs a DC path to
ground, input configurations illustrated in Figure 3 and Figure 4 should be used. The value
of capacitor Cr influences the behavior of the SVRR at low frequencies; increasing the
value of Cr increases the performance of the SVRR; see Figure 12.
13.11 Application 6: Line driver application
The TDA8559T delivers a virtual rail-to-rail output voltage. Because the input mode has to
be high, the input configurations illustrated in Figure 5 and Figure 6 should be used. This
application can also be used for headphone application, however, due to the limited output
current and the limited output power at the headphone, series resistors have to be used
between the output pins and the load; see Figure 13.
The value of capacitor Cr influences the behavior of the SVRR at low frequencies;
increasing the value of Cr increases the performance of the SVRR.

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Product data sheets Rev. 03 — 15 May 2006 15 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
13.12 Application 7: Line driver application
With the supply voltage connected to pin 15 it is possible to use the head amplifier above
the maximum of 18 V to pin 16. The internal supply voltage will be reduced to a maximum
of approximately 17 V.
This will be convenient in applications where the supply voltage is higher than 18 V,
however an output voltage swing that reaches the higher supply voltage is not required.
the input configurations illustrated in Figure 5 and Figure 6 should be used. This
application can also be used for headphone applications. However, due to the limited
output current, series resistors have to be used between the output pins and the load; see
Figure 14.
13.13 Application diagrams
Fig 8. Application 1; single-ended with loudspeaker capacitor
+
−
+
−
+
−
+
−
OA
INPUT
LOGIC
V/I
REFERENCE
V/I
1
STANDBY
MUTE
MODE
SVRR
GND
2
3
5
6
412
Cb
BUFFER
OUT2
OUT1
IN1
IN2
mgd116
11
14
1615
13
7
8
VP
VP
VP1
VP2
BUFFER
OA
50 kΩ
100 kΩ
100
kΩ
50 kΩ
50 kΩ
50 kΩ
50
kΩ
50
kΩ
TDA8559T
DQC
100 µF
220 µF
220 µF
100
nF
+VP
32 Ω
32 Ω
+−
+−
22 µFCr

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Product data sheets Rev. 03 — 15 May 2006 16 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
Fig 9. Application 2; single-ended to buffer (without loudspeaker capacitor)
+
−
+
−
+
−
+
−
OA
INPUT
LOGIC
V/I
REFERENCE
V/I
1
STANDBY
MUTE
MODE
SVRR
GND
2
3
5
6
412
Cb
BUFFER
OUT2
OUT1
IN1
IN2
mgd117
11
14
1615
13
7
8
VP
VP
VP1 VP2
BUFFER
OA
50 kΩ
100 kΩ
100
kΩ
50 kΩ
50 kΩ
50 kΩ
50
kΩ
50
kΩ
TDA8559T
DQC
100 µF
100
nF
+VP
32 Ω
32 Ω
+−
+−

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Product data sheets Rev. 03 — 15 May 2006 17 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
Fig 10. Application 3; improved single-ended to buffer (without loudspeaker capacitor)
+
−
+
−
+
−
+
−
OA
INPUT
LOGIC
V/I
REFERENCE
V/I
1
STANDBY
MUTE
MODE
SVRR
GND
2
3
5
6
412
Cb
BUFFER
OUT2
OUT1
IN1
IN2
mgd118
11
14
1615
13
7
8
VP
VP
VP1
VP2
BUFFER
OA
50 kΩ
100 kΩ
100
kΩ
50 kΩ
50 kΩ
50 kΩ
50
kΩ
50
kΩ
TDA8559T
DQC
+−
100 µF
100
nF
+VP
32 Ω
32 Ω
+−

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Product data sheets Rev. 03 — 15 May 2006 18 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
Fig 11. Application 4; BTL mono amplifier
+
−
+
−
+
−
+
−
OA
INPUT
LOGIC
V/I
REFERENCE
V/I
1
STANDBY
MUTE
MODE
SVRR
GND
2
3
5
6
412
Cb
BUFFER
OUT2
OUT1
IN1
IN2
mgd119
11
14
1615
13
7
8
VP
VP
VP1 VP2
BUFFER
OA
50 kΩ
100 kΩ
100
kΩ
50 kΩ
50 kΩ
50 kΩ
50
kΩ
50
kΩ
TDA8559T
DQC
100 µF
100
nF
+VP
25 Ω

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Product data sheets Rev. 03 — 15 May 2006 19 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
VP= 1.9 V to 6 V.
Fig 12. Application 5; line driver application
+
−
+
−
+
−
+
−
OA
INPUT
LOGIC
V/I
REFERENCE
V/I
1
STANDBY
MUTE
MODE
SVRR
GND
2
3
5
6
412
Cb
BUFFER
OUT2
OUT1
IN1
IN2
mgd120
11
14
1615
13
7
8
VP
VP
VP1 VP2
BUFFER
OA
50 kΩ
100 kΩ
100
kΩ
50 kΩ
50 kΩ
50 kΩ
50
kΩ
50
kΩ
TDA8559T
DQC
100 µF
100
nF
+VP
10 µF
1 kΩ
1 kΩ
10 µF
22 µFCr

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Product data sheets Rev. 03 — 15 May 2006 20 of 36
Philips Semiconductors TDA8559T
Low-voltage stereo headphone amplifier
VP= 6 V to 18 V.
Fig 13. Application 6; line driver application
+
−
+
−
+
−
+
−
OA
INPUT
LOGIC
V/I
REFERENCE
V/I
1
STANDBY
MUTE
MODE
100 nF
100 nF
SVRR
GND
2
3
5
6
412
Cb
BUFFER
OUT2
OUT1
IN1
IN2
mgd121
11
14
1615
13
7
8
VP
VP
VP1 VP2
BUFFER
OA
50 kΩ
100 kΩ
100
kΩ
50 kΩ
50 kΩ
50 kΩ
50
kΩ
50
kΩ
TDA8559T
DQC
100 µF
100
nF
220
nF
+VP
10 µF
1 kΩ
1 kΩ
10 µF
22 µFCr