Philips tda8579 DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
TDA8579
Dual common-mode rejection
differential line receiver
Product specification
Supersedes data of January 1994
File under Integrated Circuits, IC01
1995 Dec 15
Philips Semiconductors Product specification
Dual common-mode rejection
TDA8579
differential line receiver
FEATURES
• Excellent common-mode rejection, up to high
frequencies
• Elimination of source resistance dependency in the
common-mode rejection
• Few external components
• High supply voltage ripple rejection
• Low noise
• Low distortion
• All pins 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 5.0 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
CMRR common-mode rejection ratio R
noise output voltage − 3.7 5.0 µV
s
GENERAL DESCRIPTION
The TDA8579 is a two channel differential amplifier with
0 dB gain and low distortion. The device has been
primarily developed for car radio applications where long
connections between signal sources and amplifiers (or
boosters) are necessary and where ground noise has to be
eliminated. The device is intended to be used to receive
line inputs in audio applications that require a high level of
common-mode rejection. The device is contained in an
8-pin small outline (SO) or dual in-line (DIP) package.
=0Ω−80 − dB
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA8579 DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
TDA8579T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
1995 Dec 15 2
Philips Semiconductors Product specification
Dual common-mode rejection
differential line receiver
BLOCK DIAGRAM
V
CC
TDA8579
GND
8
7
V
CC
4
6
5
MBD230
INL
INR
1
2
IN
3
Fig.1 Block diagram.
OUTL
SVRR
OUTR
TDA8579
FUNCTIONAL DESCRIPTION
The TDA8579 contains two identical differential amplifiers
with a voltage gain of 0 dB. The device is intended to
receive line input signals for audio applications. The
TDA8579 has a very high level of common-mode rejection
and thus eliminates ground noise. The common-mode
rejection remains constant up to high frequencies (the
amplifier gain is fixed at 0 dB). The inputs have a high input
impedance. 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 capacitor
connected to the negative input is advised. Because the
input impedance is relatively high, this results in a large
settling time of the DC input voltage. Therefore a
quick-charge circuit is included to charge the input
capacitor within 0.2 seconds.
All input and output pins are protected against high
electrostatic discharge conditions (4000 V, 150 pF, 150 Ω).
PINNING
SYMBOL PIN DESCRIPTION
INL+ 1 positive input left
IN− 2 common negative input
INR+ 3 positive input right
SVRR 4 half supply voltage
GND 5 ground
OUTR 6 output right
OUTL 7 output left
V
CC
8 supply voltage
INL
1
IN
2
INR
SVRR
TDA8579
3
4
MBD231
Fig.2 Pin configuration.
V
8
CC
OUTL
7
OUTR
6
5
GND
1995 Dec 15 3
Philips Semiconductors Product specification
Dual common-mode rejection
TDA8579
differential 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
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
maximum junction temperature − +150 °C
thermal resistance from junction to ambient in free air
TDA8579 (DIP8) 110 K/W
TDA8579T (SO8) 160 K/W
1995 Dec 15 4
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