Philips TDA8579T-N1, TDA8579-N1 Datasheet
DATA SH EET
Product specification
Supersedes data of January 1994
File under Integrated Circuits, IC01
1995 Dec 15
INTEGRATED CIRCUITS
TDA8579
Dual common-mode rejection
differential line receiver
1995 Dec 15 2
Philips Semiconductors Product specification
Dual common-mode rejection
differential line receiver
TDA8579
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.
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.
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
CC
supply voltage 5.0 8.5 18 V
I
CC
supply current VCC= 8.5 V − 11 14 mA
G
v
voltage gain −0.5 0 +0.5 dB
SVRR supply voltage ripple rejection 55 60 − dB
V
no
noise output voltage − 3.7 5.0 µV
Z
i
input impedance 100 240 − kΩ
CMRR common-mode rejection ratio R
s
=0Ω−80 − dB
TYPE
NUMBER
PACKAGE
NAME DESCRIPTION VERSION
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 3
Philips Semiconductors Product specification
Dual common-mode rejection
differential line receiver
TDA8579
BLOCK DIAGRAM
Fig.1 Block diagram.
MBD230
TDA8579
V
CC
7
4
6
1
2
3
8
V
CC
GND
INR
INL
IN
OUTL
SVRR
OUTR
5
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
Fig.2 Pin configuration.
1
2
3
4
8
7
6
5
TDA8579
INR
IN
INL
SVRR
GND
OUTR
OUTL
V
CC
MBD231
1995 Dec 15 4
Philips Semiconductors Product specification
Dual common-mode rejection
differential line receiver
TDA8579
LIMITING VALUES
in accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
CC
supply voltage operating − 18 V
I
ORM
repetitive peak output current − 40 mA
V
sc
AC and DC short-circuit safe voltage − 18 V
T
stg
storage temperature −55 +150 °C
T
amb
operating ambient temperature −40 +85 °C
T
j
maximum junction temperature − +150 °C
SYMBOL PARAMETER VALUE UNIT
R
th j-a
thermal resistance from junction to ambient in free air
TDA8579 (DIP8) 110 K/W
TDA8579T (SO8) 160 K/W
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