TDA8559.PDF

INTEGRATED CIRCUITS

DATA SHEET

TDA8559

Low-voltage stereo headphone

amplifier

Preliminary specication

File under Integrated Circuits, IC01

1996 Jan 02

Philips Semiconductors

Preliminary specication

Low-voltage stereo headphone amplier

TDA8559

FEATURES

APPLICATIONS

Operating voltage from 1.8 to 30 V

Portable telephones

Very low quiescent current

Walk-man’s

Low distortion

Portable audio

Few external components

Mains fed equipment.

Differential inputs

Usable as a mono amplifier in bridge-tied load (BTL) or

stereo single-ended (SE)

GENERAL DESCRIPTION

The TDA8559 is a stereo amplifier that operates over a

wide supply voltage range from 1.8 to 30 V and consumes

a very low quiescent current. This makes it suitable for

battery fed applications (2

Single-ended mode without loudspeaker capacitor

Mute and standby mode

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 W), or as a line driver in

mains applications.

Short-circuit proof to ground, to supply voltage (<18 V)

and across load

No switch on or switch off clicks

ESD protected on all pins.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

V P

operating supply voltage

1.8

I q(tot)

total quiescent current

2.75

I stb

standby supply current

Stereo application

P o

output power

THD = 10%

THD

total harmonic distortion

P o =20mW; f i = 1 kHz

0.05

0.1

P o =20mW; f i = 10 kHz

0.1

G v

voltage gain

f ss

small signal roll-off

frequency

1dB

750

kHz

BTL application

P o

output power

THD = 10%

125

140

THD

total harmonic distortion

P o =20mW; f i = 1 kHz

0.075

0.15

P o =20mW; f i = 10 kHz

0.2

G v

voltage gain

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

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

1996 Jan 02

Philips Semiconductors

Preliminary specication

Low-voltage stereo headphone amplier

TDA8559

BLOCK DIAGRAM

V P2

V P1

handbook, full pagewidth

STANDBY

REFERENCE

V P

INV1

V/I

INV1

OUT1

50 k

DQC

MUTE

INPUT

LOGIC

MODE

DQC

INV2

OUT2

V/I

INV2

V P

SVRR

BUFFER

TDA8559

9,10

MGD115

n.c.

GND

Fig.1 Block diagram.

1996 Jan 02

Philips Semiconductors

Preliminary specication

Low-voltage stereo headphone amplier

TDA8559

PINNING

SYMBOL

DESCRIPTION

STANDBY

standby select

INV1

non-inverting input 1

INV1

inverting input 1

handbook, halfpage

STANDBY

V P1

SVRR

supply voltage ripple rejection

INV2

non-inverting input 2

INV1

V P2

INV2

inverting input 2

INV1

OUT1

MUTE

mute select

SVRR

GND

TDA8559

MODE

input mode select

- INV2

BUFFER

n.c.

not connected

INV2

OUT2

n.c.

not connected

MUTE

n.c.

OUT2

output 2

BUFFER

buffer output (0.5V P )

MODE

n.c.

GND

ground

MGD114

OUT1

output 1

V P2

high supply voltage

Fig.2 Pin configuration.

V P1

low supply voltage

FUNCTIONAL DESCRIPTION

V/I converters

The TDA8559 contains two amplifiers with differential

inputs, a 0.5V P output buffer and a high supply voltage

stabiliser. Each amplifier consist of a voltage-to-current

converter (V/I), an output amplifier and its dynamic

quiescent controller. The gain of each amplifier is internally

fixed at 26 dB (= 20

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 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

bridge-tied load (BTL) configuration thereby resulting in

more output power.

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).

With three mode select pins, the device can be switched

into the following modes;

1. Standby mode (I P <10

2. Mute mode

3. Operation mode, with two input selections (the input

source is directly connected or connected via a

coupling capacitor 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.

1996 Jan 02

The V/I converters have a transconduction of 400

Philips Semiconductors

Preliminary specication

Low-voltage stereo headphone amplier

TDA8559

Output ampliers

Stabilizer

The output amplifiers have a transresistance of 50 k W , a

bandwidth of approximately 750 kHz and a maximum

output current of 150 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

0.5V P buffer. This reduces the distortion when the load is

connected between an output amplifier and the buffer

(because feedback is applied over the load).

The TDA8559 has a voltage supply range from

1.8 to 30 V. This range is divided over two supply voltage

pins. Pin 16 is 1.8 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 P is

approximately 6 to 30 V. The stabilizer output is internally

connected to the supply voltage pin 16 and in the range

from 6 to 18 V to pin 15. 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.

Buffer

The buffer delivers 0.5V P to the output with a maximum

output (sink and source) current of 300 mA (peak).

Input logic

Dynamic quiescent controller

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 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 its own output

amplifier. This will reduce the cross-over distortion that

normally occurs at high frequencies and low quiescent

current. The DQC gives two output currents that are linear

with the amplitude and the frequency of the output signal

of its own output amplifier. These currents control the

quiescent current.

The input mode pin must be connected to V P 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

1996 Jan 02

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