TDA4445.PDF

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SOUND IF AMPLIFIER
TDA4445A
TDA4445B
SOUND IF AMPLIFIER
. QUADRATURE INTERCARRIER DEMODU-
LATOR
. GOOD SIGNAL TO NOISE RATIO
. FAST AVERAGING AGC
. IF AMPLIFIER CAN BE SWITCHED OFF FOR
VTR MODE
. GOOD AM SUPPRESSION
. OUTPUT SIGNAL STABILIZED AGAINST
SUPPLY VOLTAGE VARIATIONS
. VERY FEW EXTERNAL COMPONENTS
DESCRIPTION
TDA4445A :
Sound IF amplifier, with FM processing for quasi
parallel sound system.
TDA4445B :
Sound IF amplifier, with FM processing and AM
demodulator, for multi-standard sound TV appli-
ances.
TDA4445B additionnal :
Bistandard applications (B/G and L)
No adjustment of the AM demodulator
Low AM distortion
DIP16
(Plastic Package)
ORDER CODE : TDA4445A - TDA4445B
PIN CONNECTIONS
IF INPUT
1
16
IF INPUT
NOT TO BE CONNECTED
2
15
NOT TO BE CONNECTED
IF AGC TIME CONSTANT
3
14
NOT TO BE CONNECTED
NOT TO BE CONNECTED
NOT TO BE CONNE CTED FOR TDA4445A
AVE RAGING CAP ACITOR FOR TDA4445B
NOT TO BE CONNE CTED FOR TDA4445A
A.F. SOUND OUTPU T FOR TDA4445B
4
13
GROUND
5
12
FM MODULATED SOUND OUTPUT
6
11
SUPPLY VOLTAGE
NOT TO BE CONNECTED
7
10
NOT TO BE CONNECTED
REFERENCE L.C. NETWORK
8
9
REFERENCE L.C. NETWORK
December 1992
1/6
. VERY HIGH INPUT SENSITIVITY
11043610.002.png
TDA4445A - TDA4445B
BLOCK DIAGRAMS
TDA4445A
TDA4445B
. Three symmetrical and gain controlled wide
band amplifier stages, which are extremely sta-
ble by quasi DC coupling without feedback.
. Sound-IF-amplifier stage with impedance con-
verter
. Averaging AGC with discharge control circuit
. AGC voltage generator
. Carrier controlled demodulator
. Audio frequency stage with impedance con-
verter
. High phase accuracy of the carrier signal proc-
. Averaging low pass AGC
Quasi parallel sound operation :
2/6
. Linear quadrature demodulator
essing, independent from AM
GENERAL DESCRIPTION
This circuit includes the following functions :
AM-Demodulation (only TDA4445B) :
11043610.003.png
TDA4445A - TDA4445B
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V CC
Supply Voltage Range
Pin 11
15
V
I CC
Supply Current
Pin 11
70
mA
V ext
External Voltages
Pin 3
Pin 12
12
8
V
V
V ext
External Voltages
TDA4445A - TDA4445B
TDA4445B
Pin 5
Pin 6
8
8
V
V
P to t
Power Dissipation
1
W
T j
Junction Temperature
125
° C
T amb
Ambient Temperature Range
0, + 70
° C
T stg
Storage Temperature Range
– 25, + 125
° C
THERMAL DATA
Symbol
Parameter
Value
Unit
R th(j-a)
Junction-ambient Thermal Resistance
70
°
C/W
ELECTRICAL OPERATING CHARACTERISTICS
T amb =+25
C, V CC = 12V (unless otherwise specified)
Symbol
Parameter
Min. Typ. Max. Unit
DC CHARACTERISTICS
V CC
Supply Voltage
Pin 13
10
12
15
V
I CC
Supply Current (V 3 = 3.5V)
Pin 11
45
60
mA
V O
DC Output Voltage (V 3 = 3.5V)
Pin 12
4.25
5
5.75
V
I
Output DC Current (V 3 = 3.5VV 11 = 12V)
Pin 12
1
2
mA
R
Input Impedance
Pins 1-16
2
k
W
C
Input Impedance
Pins 1-16
2
pF
V
Switch off Control Voltage for VTR Mode
Pin 3
9
10
V
I
Switch off Control Current for VTR Mode
Pin 3
150
m A
AGC CHARACTERISTICS
D
GIF
IF AGC Range
62
dB
QUASI PARALLEL SOUND OPERATION
(f PC = 38.9MHz, f SC1 = 33.4MHz, f SC2 = 33.16MHz, PC/SC 1 = 13dB, PC/SC2 = 20dB, PC unmodulated)
V I
Min. Input Voltage (5.5MHz - Output Signal - 3dB)
Pins 1-16
70
m V eff
V I
Max. Input Voltage (5.5MHz - Output Signal + 1dB)
Pins 1-16
90
mV eff
V O
Sound-IF-output Voltage (V 1-16 = 20mV eff SC unmodulated)
5.5MHz Output Voltage
5.74MHz Output Voltage
Pin 12
200
100
400
300
mV eff
mV eff
Signal to noise ratio measured according to CCIR 468-2
Picture Modulation Ratio 90%, Reference signal (V 1-16 = 10mV),
FM-frequency deviation30kHz
Pin 12
Ý
Out 1 350mV RMS
f mod = 1kHz, measured at audio-output
Out 2 350mV RMS
S
+
N
Black Screen (1. Channel/2. Channel)
Grid Screen (1. Channel/2. Channel)
55/50
45/40
dB
dB
N
AM DEMODULATI0N (TDA4445B only) (f SC = 39.2MHz, m = 80%, f mod = 1kHz)
V I
Min. Input Voltage (Audio Output Signal - 3dB)
Pins 1-16
70
m
V eff
V O
Output DC Voltage (V 1-16 = 10mV eff unmodulated)
Pin 6
3.3
4.5
V
I
Output DC Current (V 6 = 7.5V, V 3 = 3.5V)
Pin 6
0.3
1.2
mA
d
Distortion (V 1-16 = 10mV, f mod = 1kHz , m = 80%)
Pin 6
2.5
4
%
V O
AF Output Voltage (V 1-16 = 100mV eff , m = 50% , f mod = 10kHz) Pin 6
500
700 900 mV eff
3/6
°
11043610.004.png
TDA4445A - TDA4445B
TYPICAL APPLICATION
Figure 1 : Quasi Parallel Sound Operation
4/6
11043610.005.png
TDA4445A - TDA4445B
TYPICAL APPLICATION
Figure 2 : Bistandard Operation (FM stereo sound + AM sound)
5/6
11043610.001.png

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