Philips tda8559 DATASHEETS

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DATA SH EET

TDA8559

Low-voltage stereo headphone amplifier

Product speciﬁcation Supersedes data of 1996 Jan 02 File under Integrated Circuits, IC01

1997 Jun 27

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

FEA TURES

• Operating voltage from 1.9 to 30 V

• Very low quiescent current

• Low distortion

• Few external components

APPLICATIONS

• Portable telephones

• Walk-mans

• Portable audio

• Mains fed equipment.

• Differential inputs

• Usable as a mono amplifier in Bridge-Tied Load (BTL) or

stereo Single-Ended (SE)

• Single-ended mode without loudspeaker capacitor

• Mute and standby mode

• Short-circuit proof to ground, to supply voltage (<10 V)

and across load

• No switch on or switch off clicks

• ESD protected on all pins.

GENERAL DESCRIPTION

The TDA8559 is a stereo amplifier that operates over a wide supply voltage range from 1.9 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.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

V I

q(tot)

stb

operating supply voltage 1.9 3 30 V total quiescent current − 2.75 4 mA standby supply current −−10 µA

Stereo application

THD total harmonic distortion P

output power THD = 10% 30 35 − mW

=20mW; fi= 1 kHz − 0.075 0.15 %

=20mW; fi= 10 kHz − 0.1 − %

voltage gain 25 26 27 dB small signal roll-off frequency −1dB − 750 − kHz

BTL application

THD total harmonic distortion P

output power THD = 10% 125 140 − mW

=70mW; fi= 1 kHz − 0.05 0.1 %

=70mW; fi= 10 kHz − 0.2 − %

voltage gain 31 32 33 dB

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA8559 DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 TDA8559T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

1997 Jun 27 2

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

BLOCK DIAGRAM

handbook, full pagewidth

STANDBY

+IN1

−IN1

MUTE

MODE

+IN2

−IN2

SVRR

2 3

7 8

5 6

REFERENCE

50 kΩ

kΩ

100 kΩ

V/I

−

50 kΩ

INPUT

LOGIC

V/I

−

50 kΩ

TDA8559

− +

−

BUFFER

50 kΩ

DQC

50 kΩ

P1 1615

OUT1

OUT2

BUFFER

n.c. GND

Fig.1 Block diagram.

1997 Jun 27 3

139,10

MGD115

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

PINNING

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 (0.5V

)

GND 13 ground OUT1 14 output 1 V

15 high supply voltage 16 low supply voltage

handbook, halfpage

STANDBY

+IN1

2 3

−IN1 4

SVRR

+IN2

−IN2

MUTE

MODE

5 6 7 8

TDA8559

MGD114

Fig.2 Pin configuration.

16 15 14 13 12 11 10

OUT1 GND BUFFER OUT2 n.c. n.c.

FUNCTIONAL DESCRIPTION

The TDA8559 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 (I

<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 0.5VP 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.

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 = 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).

1997 Jun 27 4

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

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).

Buffer

The buffer delivers 0.5V

to the output with a maximum

output (sink and source) current of 200 mA (peak).

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 cross-over 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.

Stabilizer

The TDA8559 has a voltage supply range from

1.9 to 30 V. This range is divided over two supply voltage pins. Pin 16 is 1.9 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 V

approximately 6 to 30 V. The stabilizer output is internally connected to the supply voltage pin 16. In the range from 6 to 18 V, the voltage drop to pin 16 is 1 V. In the range from 18 to 30 V the stabilizer output voltage (to pin 16) is approximately 17 V.

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 V

when 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.

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.

1997 Jun 27 5

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

P2(max)

P1(max)

i(max)

ORM

tot

amb

stg

maximum supply voltage (pin 15) − 30 V maximum supply voltage (pin 16) − 18 V maximum input voltage − 18 V peak output current repetitive − 150 mA total power dissipation SO16 − 1.19 W

DIP16 − 2.4 W operating ambient temperature −40 +85 °C storage temperature −55 +150 °C virtual junction temperature − 150 °C short-circuiting time VP<10V − 1 hour

QUALITY SPECIFICATION

Quality in accordance with specification can be found in the

“SNW-FQ-611E

”, if this type is used as an audio amplifier. The number of the quality

“Quality Reference handbook”

. The handbook can be ordered using the code

9397 750 00192.

THERMAL CHARACTERISTICS

SYMBOL DESCRIPTION VALUE UNIT

th j-a

thermal resistance from junction to ambient in free air

DIP16 52 K/W SO16 105 K/W

CHARACTERISTICS

=3V; T

=25°C; fi= 1 kHz; unless otherwise speciﬁed.

amb

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

DC characteristics

V I

q(tot)

stb

operating supply voltage note 1 1.9 3 30 V total quiescent current open load − 2.75 4 mA standby supply current open load −−10 µA standby mode voltage standby 0 − 0.5 V

operating 1.5 − 18 V

mute mode voltage mute 0 − 0.5 V

operating 1.5 − 18 V

bias

input bias current − 100 300 nA

1997 Jun 27 6

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Single-ended stereo application (R

output power THD = 10% 30 35 − mW

THD total harmonic distortion P

∆G

no(mute)

o(mute)

voltage gain 25 26 27 dB small signal roll-off frequency −1dB − 750 − kHz channel separation Rs=5kΩ 40 −−dB

 channel unbalance −−1dB

noise output voltage note 3 − 70 85 µV noise output voltage in mute note 3 − 20 30 µV output voltage in mute note 4 −−30 µV mid-tap voltage 1.4 1.5 1.6 V input impedance 75 100 125 kΩ DC output offset voltage note 5 −−100 mV

=32Ω)

=20mW; fi= 1 kHz; note 2 − 0.075 0.15 %

=20mW; fi= 10 kHz; note 2 − 0.1 − %

SVRR supply voltage ripple rejection note 6 45 55 − dB

BTL application (R

output power THD = 10% 125 140 − mW

THD total harmonic distortion P

no(mute)

o(mute)

voltage gain 31 32 33 dB small signal roll-off frequency −1dB − 750 − kHz noise output voltage note 3 − 100 120 µV noise output voltage in mute note 3 − 25 40 µV output voltage in mute note 4 −−40 µV DC output offset voltage note 7 −−150 mv

=25Ω)

=70mW; fi= 1 kHz; note − 0.05 0.1 %

=70mW; fi= 10 kHz; note 2 − 0.1 − %

SVRR supply voltage ripple rejection note 6 39 49 − dB Z

Line driver application (R

input impedance 39 50 61 kΩ

≥ 1kΩ)

line output voltage 0.1 − 2.9 V

Notes

1. The supply voltage range at pin VP1 is from 1.9 to 18 V. Pin VP2 is used for the voltage range from 6 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 0.5VP output.

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.

1997 Jun 27 7

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

APPLICATION INFORMATION General

For applications with a maximum supply voltage of 6 V (input mode LOW) the input pins need a DC path to ground (see Figs 3 and 4). For applications with supply voltages in the range from 6 to 18 V (input mode HIGH) the input DC level is 0.5V

+ 0.6 V. In this situation the input

configurations illustrated in Figs 5 and 6 have to be used. The capacitor Cb is recommended for stability

improvement. The value may vary between 10 and 100 nF. This capacitor should be placed close to the IC between pin 12 and pin 13.

Heatsink design

The standard application is stereo headphone single-ended with a 32 Ω load impedance to buffer (see Fig.9). The headphone amplifier can deliver a peak output current of 150 mA into the load.

For the DIP16 envelope R sine wave power dissipation for T

2.4 W

For T

1.7 W

For the SO16 envelope R

150 25–

---------------------52

=60°C the maximum total power dissipation is:

amb

150 60–

---------------------52

th j-amb

sinewave power dissipation for T

1.2 W

For T

0.85 W

150 25–

----------------------

105

=60°C the maximum total power dissipation is:

amb

150 60–

---------------------105

= 52 K/W; the maximum

th j-amb

=25°C is:

amb

= 105 K/W; the maximum

=25°C is:

amb

Test conditions

=25°C; unless otherwise specified: VP=3V,

amb

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).

• The graphs for the single-ended application have been measured with the application illustrated in Fig.9; input configuration for input mode low (Fig.4) and input configuration for input mode high (Fig.6).

• The graphs for the BTL application ‘input mode low’ have been measured with the application circuit illustrated in Fig.11 and the input configuration illustrated in Fig.4.

• The graphs for the line-driver application have been measured with the application circuit illustrated in Fig.13 and the input configuration illustrated in Fig.6; input mode high.

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 (V

− 1.8 V). A DC path to ground is needed.

The maximum output voltage is approximately

2.1 V (RMS). Input configurations illustrated in Figs 3 and 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 Figs 5 and 6 should be used.

1997 Jun 27 8

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

2.2 µF

5 kΩ INPUT

pins 2 and 5

pins 3 and 6

MGD123

Fig.3 Input configuration; with input capacitor

(VP< 6 V).

220 nF

pins 2 and 5 INPUT

pins 3 and 6

MGD125

handbook, halfpage

pins 2 and 5 INPUT

pins 3 and 6

MGD124

Fig.4 Input configuration; without input capacitor

(VP< 6 V).

pin 2

100 nF

220

100 nF

pin 3

pin 6

pin 5

MGD126

Fig.5 Input configuration (VP> 6 V).

620 kΩ

47 kΩ

mute

220 nF

MGL135

Fig.7 Soft mute.

1997 Jun 27 9

Fig.6 Input configuration (at VP> 6 V, combined

negative inputs).

Standby/mute

• The standby mode (V1< 0.5 V) is intended for power saving purpose. Then the total quiescent current is <10 µA.

• 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.

Philips Semiconductors Product speciﬁcation

Low-voltage stereo headphone ampliﬁer TDA8559

Application 1: SE with loudspeaker capacitor

(see Fig.8) The value of capacitor Cr influences the behaviour of the

Supply Voltage Ripple Rejection (SVRR) at low frequencies; increasing the value of Cr increases the performance of the SVRR.

Application 2: SE to buffer (without loudspeaker capacitor) (see Fig.9)

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.

Application 3: Improved SE to buffer (without loudspeaker capacitor) (see Fig.10)

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.

Application 4: Bridge tied load mono ampliﬁer

(see Fig.11) 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.

Application 6: Line driver application 6 V < V

<18V

(see Fig.13) The TDA8559T delivers a virtual rail-to-rail output voltage.

Because the input mode has to be high, the input configurations illustrated in Figs 5 and 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.

The value of capacitor Cr influences the behaviour of the SVRR at low frequencies; increasing the value of Cr increases the performance of the SVRR.

Application 7: Line driver application 6V < V

<30V

(see Fig.14) 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 Figs 5 and 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.

Application 5: Line driver application 1.9 V < V

<6V

(see Fig.12) The TDA8559 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 Figs 3 and 4 should be used. The value of capacitor Cr influences the behaviour of the SVRR at low frequencies; increasing the value of Cr increases the performance of the SVRR.

1997 Jun 27 10

+ 22 hidden pages