Philips TDA8578T, TDA8578 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA8578

Dual common-mode rejection
differential line receiver

Product specification
Supersedes data of November 1993
File under Integrated Circuits, IC01

1995 Dec 15

Philips Semiconductors Product specification

Dual common-mode rejection differential

TDA8578

line receiver

FEATURES

• Excellent common-mode rejection up to high
frequencies

• Elimination of source resistance in the common-mode
rejection

• Few external components

• High supply voltage ripple rejection

• Low noise

• Low distortion

• Protected against electrostatic discharge

• AC and DC short circuit safe to ground and V

CC

• Fast DC settling.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

I

CC

G

v

supply voltage 5 8.5 18 V
supply current VCC= 8.5 V − 11 14 mA

voltage gain −0.5 0 +0.5 dB
SVRR supply voltage ripple rejection −55 −60 − dB
V

no

Z

 input impedance 100 240 − kΩ

i

noise output voltage − 3.7 5 µV

CMRR common-mode rejection ratio R

APPLICATIONS

• Audio

• Car radio.

GENERAL DESCRIPTION

The TDA8578 is a two-channel differential amplifier in a
16 pin DIL or SO package intended to receive line inputs
in audio applications requiring a high-level of
common-mode rejection. The amplifier has a gain of 0 dB
and a low distortion. The device is primarily developed for
those car radio applications where long connections
between signal sources and amplifiers (or boosters) are
necessary and ground noise has to be eliminated.

=0Ω−80 − dB

s

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA8578 DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1

TDA8578T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

1995 Dec 15 2

Philips Semiconductors Product specification

Dual common-mode rejection differential
line receiver

BLOCK DIAGRAM

V

CC

TDA8578

GND

16

12

OUTL

V

CC

8

SVRR

11

OUTR

9

MBD209

INL
INL

INR
INR

1

5

6

7

TDA8578

FUNCTIONAL DESCRIPTION

The TDA8578 contains two identical differential amplifiers
with a voltage gain of 0 dB. The device is intended to
receive line input signals. The device has a very high-level
of common-mode rejection and it eliminates ground noise.
The common-mode rejection keeps constant up to high
frequencies. The gain of the amplifiers is fixed at 0 dB. The
inputs have a high-input impedance and the output stage
is a class AB stage with a low-output impedance. For a
large common-mode rejection also at low frequencies, an
electrolytic input capacitor at the negative input pin is
advised. The input impedance is relative high, this would
result in a large settling time of the DC input voltage.
Therefore a quick charge circuit is included that charges
the input capacitor within 0.2 s.

All input and output pins are protected against high
electrostatic discharge conditions (4000 V, 150 pF, 150 Ω).

Fig.1 Block diagram.

PINNING

SYMBOL PIN DESCRIPTION

INL+ 1 positive input left
n.c. 2 not connected
n.c. 3 not connected
n.c. 4 not connected
INL− 5 negative input left
INR− 6 negative input right
INR+ 7 positive input right
SVRR 8 half supply voltage
GND 9 ground
n.c. 10 not connected
OUTR 11 output right
OUTL 12 output left
n.c. 13 not connected
n.c. 14 not connected
n.c. 15 not connected
V

CC

16 supply voltage

1

INL

2

n.c.

3

n.c.

4

n.c.
INL
INR
INR

SVRR

TDA8578

5
6
7
8

MBD210

Fig.2 Pin configuration.

V

16

CC

15

n.c.
n.c.

14
13

n.c.
OUTL

12

OUTR

11

n.c.

10

GND

9

1995 Dec 15 3

Philips Semiconductors Product specification

Dual common-mode rejection differential

TDA8578

line receiver

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

I

ORM

V

sc

T

stg

T

amb

T

j

HANDLING

Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling integrated circuits.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

R

th j-a

supply voltage operating − 18 V
repetitive peak output current − 40 mA
AC and DC short-circuit safe voltage − 18 V
storage temperature −55 +150 °C
operating ambient temperature −40 +85 °C
junction temperature − +150 °C

thermal resistance from junction to ambient in free air

TDA8578 (DIP16) 75 K/W
TDA8578T (SO16) 120 K/W

DC CHARACTERISTICS

V

= 8.5 V; T

CC

=25°C; in accordance with test circuit (see Fig.3); unless otherwise specified.

amb

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

I

CC

V

O

t

set

supply voltage 5 8.5 18 V
supply current − 11 14 mA
DC output voltage note 1 − 4.3 − V
DC input voltage settling time − 0.2 − s

Note

1. The DC output voltage with respect to ground is approximately 0.5V

CC

.

1995 Dec 15 4