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PDF TDA8559T Data sheet ( Hoja de datos )
| Número de pieza | TDA8559T | |
| Descripción | Low-voltage stereo headphone amplifier | |
| Fabricantes | Philips | |
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TDA8559T
Low-voltage stereo headphone amplifier
Rev. 03 — 15 May 2006
Product data sheets
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
I Operating voltage from 1.9 V to 30 V
I Very low quiescent current
I Low distortion
I Few external components
I Differential inputs
I Usable as a mono amplifier in Bridge-Tied Load (BTL) or stereo Single-Ended (SE)
I Single-ended mode without loudspeaker capacitor
I Mute and Standby mode
I Short-circuit proof to ground, to supply voltage (< 10 V) and across load
I No switch on or switch off clicks
I ESD protected on all pins
3. Applications
I Portable telephones
I MP3 players
I Portable audio
I Mains fed equipment
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Philips Semiconductors
TDA8559T
Low-voltage stereo headphone amplifier
8. Functional description
The TDA8559T contains two amplifiers with differential inputs, a 0.5VP 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 0.5VP 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 (IP < 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 0.5VP 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.
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 0.5VP buffer. 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 0.5VP to the output with a maximum output (sink and source) current of
200 mA (peak).
TDA8559_3
Product data sheets
Rev. 03 — 15 May 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
5 of 36
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Philips Semiconductors
TDA8559T
Low-voltage stereo headphone amplifier
Table 7. Characteristics …continued
VP = 3 V; Tamb = 25 °C; fi = 1 kHz; unless otherwise specified.
Symbol Parameter
Conditions
Vno
Vno(mute)
noise output voltage
noise output voltage in
mute
Vo(mute)
Vmt
Zi
Vos
SVRR
output voltage in mute
mid-tap voltage
input impedance
DC output offset voltage
supply voltage ripple
rejection
BTL application (RL = 25 Ω)
Po output power
THD
total harmonic distortion
Gv voltage gain
fss small signal roll-off
frequency
THD = 10 %
Po = 70 mW; fi = 1 kHz
Po = 70 mW; fi = 10 kHz
−1 dB
Vno
Vno(mute)
noise output voltage
noise output voltage in
mute
Vo(mute)
Zi
Vos
SVRR
output voltage in mute
input impedance
DC output offset voltage
supply voltage ripple
rejection
Line driver application (RL = 1 kΩ)
Vo line output voltage
Min
[3] -
[3] -
[4] -
1.4
75
[5] -
[6] 45
125
-
-
31
-
[3] -
[3] -
[4] -
39
[7] -
[6] 39
0.1
Typ Max
70 85
20 30
- 30
1.5 1.6
100 125
- 100
55 -
140
0.05
0.1
32
750
100
25
-
50
-
49
-
0.1
-
33
-
120
40
40
61
150
-
- 2.9
[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 = 5 kΩ.
[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 0.5VP output.
[6] The ripple rejection is measured with a ripple voltage of 200 mV (RMS) applied to the positive supply rail (Rs = 0 kΩ).
[7] DC output offset voltage is measured between the two signal outputs.
13. Application information
Unit
µV
µV
µV
V
kΩ
mV
dB
mW
%
%
dB
kHz
µV
µV
µV
kΩ
mV
dB
V
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.
TDA8559_3
Product data sheets
Rev. 03 — 15 May 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
11 of 36
Downloaded from Elcodis.com electronic components distributor
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| PDF Descargar | [ Datasheet TDA8559T.PDF ] | |
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