Datasheet tda8577 DATASHEETS (Philips)

INTEGRATED CIRCUITS

DATA SH EET

TDA8577

Dual common-mode rejection
differential line receiver

Preliminary specification
File under Integrated Circuits, IC01

Philips Semiconductors

September 1995

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential

TDA8577

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 − 11 14 mA

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

no

| input impedance 100 240 − kΩ

|Z

i

CMRR common-mode rejection ratio R

noise output voltage − 3.7 5.0 µV

= 0 Ω−80 − dB

s

GENERAL DESCRIPTION

The TDA8577 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 a
9-pin single in-line package.

ORDERING INFORMATION

EXTENDED TYPE

NUMBER

TDA8577 9 SIL9 plastic SOT142

PACKAGE

PINS PIN POSITION MATERIAL CODE

September 1995 2

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential
line receiver

BLOCK DIAGRAM

V

CC

TDA8577

GND

9

8

OUTL

V

CC

5

SVRR

7

OUTR

6

MBD226

INL
INL

INR
INR

1

2

3

4

TDA8577

FUNCTIONAL DESCRIPTION

The TDA8577 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
TDA8577 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).

Fig.1 Block diagram.

PINNING

SYMBOL PIN DESCRIPTION

INL+ 1 positive input left
INL− 2 negative input left
INR− 3 negative input right
INR+ 4 positive input right
SVRR 5 half supply voltage
GND 6 ground
OUTR 7 output right
OUTL 8 output left
V

CC

9 supply voltage

INL

1

INL

2

INR

3
4

INR

5

SVRR

GND

OUTR

OUTL

V

CC

TDA8577
6
7
8
9

MBD227

Fig.2 Pin configuration.

September 1995 3

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential

TDA8577

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 RESISTANCE

SYMBOL PARAMETER THERMAL RESISTANCE

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

from junction to ambient in free air 80 K/W

September 1995 4

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential

TDA8577

line receiver

CHARACTERISTICS

V

= 8.5 V; T

CC

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

I

CC

V

O

t

set

G

v

α

cs

| channel unbalance −−0.5 dB

|∆G

v

f

L

f

H

| input impedance 100 240 − kΩ

|Z

i

| output impedance −−10 Ω

|Z

o

V

i(max)

V

no

V

CM(rms)

CMRR common-mode rejection ratio R

SVRR supply voltage ripple rejection note 5 55 65 − dB

THD total harmonic distortion V

THD

max

= 25 °C; f = 1 kHz; measured in test circuit of Fig.3; unless otherwise specified.

amb

supply voltage 5.0 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
voltage gain −0.5 0 +0.5 dB
channel separation Rs = 5 kΩ 70 80 − dB

low frequency roll-off −1 dB; note 2 20 −−Hz
high frequency roll-off −1 dB 20 −−kHz

maximum input voltage THD = 1% − 2 − V
noise output voltage Rs = 0 Ω; note 3 − 3.7 5.0 µV
common-mode input voltage

−−1V

(RMS value)

= 5 kΩ 66 70 − dB

s

= 0 Ω; note 4 − 80 − dB

R

s

note 6 − 60 − dB

= 1 V; − 0.02 − %

i

= 1 V;

V

i

−−0.1 %

f = 20 Hz to 20 kHz

total harmonic distortion at

Vi = 1 V; RL = 150 Ω− − 1%

maximum output current

Notes

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

CC

.

2. The frequency response is externally fixed by the input coupling capacitors.

3. The noise output voltage is measured in a bandwidth of 20 Hz to 20 kHz (unweighted).

4. The common-mode rejection ratio is measured at the output with a voltage source of 1 V (RMS) in accordance with
the test circuit (see Fig.3) while V

INL

and V

are shorted-circuited. Frequencies between 100 Hz and 100 kHz.

INR

5. The ripple rejection is measured at the output, with Rs = 2 kΩ, f = 1 kHz and a ripple amplitude of 2 V (p-p).

6. The ripple rejection is measured at the output, with Rs = 0 to 2 kΩ, f = 100 Hz to 20 kHz and a maximum ripple

amplitude of 2 V (p-p).

September 1995 5

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential
line receiver

220 nF

R

s

V

INL

5 k

Ω

22 µ

F

V

CM

V

INR

220 nF

R

s

Ω5 k

1

2

3

4

9

TDA8577

SVRR

TDA8577

8.5 V

100 nF

2.2 µ

47 µ

2.2 µ

F

OUTL

F

F

OUTR

R
10 k

MBD229

R

L

L

10 k

Ω

Ω

8

V

CC

5

7

6

10

THD

(%)

10

10

Fig.3 Test circuit.

1

2

3

10

2

10

3

10

4

10

f (Hz)

MBD215

5

10

September 1995 6

Fig.4 Total harmonic distortion as a function of frequency; Vi = 1V (RMS).

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential
line receiver

0

CMR

(dB)

20

40

60

80

100

10

(1) Rs = 5 kΩ
(2) Rs = 2 kΩ
(3) Rs = 0 kΩ

2

10

3

10

TDA8577

MBD216

(1)

(2)

(3)

4

10

f (Hz)

5

10

THD

(%)

10

10

10

Fig.5 Common-mode rejection ratio as a function of frequency; VCM = 1 V (RMS).

1

1

2

3

2

1010

3

10

V (mV)

i (rms)

MBD213

4

10

September 1995 7

Fig.6 Total harmonic distortion as a function of input voltage; f = 1 kHz.

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential
line receiver

40

CMR

(dB)

50

60

70

80

90

100 300 500 700 900

1100

V (mV)

CM (rms)

TDA8577

MBD214

1300

0

CMR

(dB)

20

40

60

80

100

10

(1) C2 = 22 µF
(2) C2 = 47 µF
(3) C2 = 100 µF

Fig.7 Common-mode rejection ratio as a function of input voltage; f = 1 kHz.

(1)
(2)
(3)

2

10

3

10

4

10

f (Hz)

MBD211

5

10

Fig.8 Common-mode rejection ratio as a function of frequency; VCM = 1 V (RMS).

September 1995 8

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential
line receiver

30

SVR
(dB)

40

50

60

70

10

2

10

TDA8577

MBD212

3

10

f (Hz)

4

10

Fig.9 Supply voltage ripple rejection as a function of frequency; V

APPLICATION INFORMATION

V

INL

V

INR

R

s

5 k

10 µF

10 µF

R

s

Ω

Ω5 k

220 nF

220 nF

1

2

TDA8577

3

4

9

SVRR

= 2 V (p-p), Rs = 2 kΩ.

ripple

8.5 V

100 nF

2.2 µ

47 µ

2.2 µ

F

OUTL

F

F

OUTR

R
10 k

MBD228

R

L

L

10 k

Ω

Ω

8

V

CC

5

7

6

September 1995 9

Fig.10 Application circuit with balanced signal source

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential
line receiver

PACKAGE OUTLINE

22.00

21.35

21.4

20.7

5

6789

2.54
(8x)

0.67

0.50

1.40

1.14

seating plane

1.0

0.3

1.40

1.14

1234

1.0

0.7

0.45

0.25

0.25
(9x)

TDA8577

3.85

3.45

1.75

1.55

1.8

1.4

6.48

6.14

12
11

0.76

3.9

3.4

0.47

0.38

M

MBC375

Dimensions in mm.

Fig.11 9-lead single in-line; plastic (SOT142).

SOLDERING
Plastic single in-line packages

B

Y DIP OR WAVE

The maximum permissible temperature of the solder is
260 °C; this temperature must not be in contact with the
joint for more than 5 s. The total contact time of successive
solder waves must not exceed 5 s.

The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified storage maximum. If the printed-circuit board has
been pre-heated, forced cooling may be necessary
immediately after soldering to keep the temperature within
the permissible limit.

R

EPAIRING SOLDERED JOINTS

Apply the soldering iron below the seating plane (or not
more than 2 mm above it). If its temperature is below
300 °C, it must not be in contact for more than 10 s; if
between 300 and 400 °C, for not more than 5 s.

September 1995 10

Philips Semiconductors Preliminary specification

Dual common-mode rejection differential

TDA8577

line receiver

DEFINITIONS

Data sheet status

Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

September 1995 11

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th

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SCD27 © Philips Electronics N.V. 1993

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Philips Semiconductors