Page 1
TELEFUNKEN Semiconductors
TDA4445A/TDA4445B
Quasi Parallel Sound Processing with Quadrature
Intercarrier Demodulator
Technology: Bipolar
Features
D
Very high input sensitivity
D
Excellent signal to noise ratio
D
Fast averaged AGC
D
IF amplifier can be switched off for VTR mode
D
Output signal stabilized against V
D
Very few external components
variations
S
TDA4445B additional
D
Targeting bistandard applications (B/G and L)
D
Alignment free AM demodulator
D
Low AM distortion
Case: DIP16
Figure 1. Block diagram TDA4445A
Figure 2. Block diagram TDA4445B
Rev . A1: 14.09.1995 1 (8)
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TDA4445A/TDA4445B
TELEFUNKEN Semiconductors
Pin Description
Pin Symbol Function
1–16 IF input
3 If AGC time constant
8–9 Tuned circuit
11 Supply voltage
12 Sound-IF-output
13 Ground
2, 4,
7, 10,
14, 15
not connected
TDA4445B additional
Pin Symbol Function
5 Average capacitor
6 AF output
Circuit Description
This circuit includes the following functions
D
Three symmetrical and gain controlled wide band
amplifier stages, which are extremely stable by quasi
DC coupling without feedback
D
Averaged AGC with discharge control circuit
D
AGC voltage generator
Quasi parallel sound operation
D
High phase accuracy of the carrier signal processing,
independent from AM
D
Linear quadrature demodulator
D
Sound–IF–amplifier stage with impedance converter
AM–Demodulation (TDA4445B only)
D
Carrier controlled demodulator
D
Audio frequency stage with impedance converter
D
Averaged low pass AGC
Absolute Maximum Ratings
Reference point pin 3, unless otherwise specified
Parameters Symbol Value Unit
Supply voltage range Pin 11 V
Supply current Pin 11 I
External voltages
TDA4445A, B Pin 3
Pin 12
TDA4445B only Pin 5, 6
Power dissipation in soldered position P
Junction temperature T
Ambient temperature range T
Storage temperature range T
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient R
V
S
S
ext
tot
j
amb
stg
thJA
10 ... 15 V
70 mA
12
8
8
1 W
125 °C
–25 to +70 °C
–25 to +125 °C
60 K/W
V
Rev . A1: 14.09.19952 (8)
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TELEFUNKEN Semiconductors
i
TDA4445A/TDA4445B
Electrical Characteristics
V
= 12 V, T
S
= + 25°C, reference point pin 13, unless otherwise specified
amb
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Supply current V
DC output voltage V
= 10 mV
1–16
or V
= 3.5 V Pin 11
3
= 10 mV,
1–16
I
S
V
O
60 mA
5.0 V
unmodulated Pin 12
DC output current V11 = 7.5 V,
V
= 3.5 V Pin 12 I
3
Input impedance Pin 1–16
Pin 1–16
max
R
C
1.8 V
1.6
2.0
Switch off control voltage VTR mode Pin 3 V 8 10 V
Switch off control current VTR mode Pin 3 I 50 150
Quasi Parallel Sound Operation
k
PF
m
W
A
fPC = 38.9 MHz, f
= 33.4 MHz, f
SC1
= 33.16 MHz, PC/SC = 13 dB, PC/SC2 = 20 dB,
SC2
PC unmodulated (equivalent to sync. peak current)
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Minimum input voltage 5.5 MHz output signal
–3dB Pin 1–16
Maximum input voltage 5.5 MHz output signal
+1 dB Pin 1–16
IF AGC range ∆G
AGC capacitor control time constant, Pin 3 C
Sound-IF-output voltage V
5.5 MHz output voltage
= 10 mV, SC unmodulated
1–16
Pin 12 v
5.74 MHz output voltage
Signal to noise ratio: measured according to CCIR 468–2
reference signal: v
f
= 1 kHz, measured at audio-output sound IF demodulator U2829B
mod
1. Channel/ 2. Channel
Standard B/G modulated IF signal
(residual carrier 10%)
= 10 mV, FM-frequency deviation = +30 kHz
1–16
Black screen Pin 12
Grid pattern
Bistandard Operation
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
IF AGC range ∆
AGC capacitor
(control time constant)
Pin 3
Pin 5
v
i
v
i
3
i
S+N
N
G
IF
C
3
C
5
50
m
V
80 mV
IF
0.33 10
64 dB
250
m
mV
F
110
62/58
dB
52/49
64 dB
10
m
F
4.7
Rev . A1: 14.09.1995 3 (8)
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TDA4445A/TDA4445B
TELEFUNKEN Semiconductors
Quasi Parallel Sound Operation
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
fPC = 38.9 MHZ, f
PC/SC= 13 dB, PC/SC2= 20 dB, PC unmodulated (equivalent to sync. peak current)
Minimum input voltage
Maximum input voltage
Sound-IF-output voltage v
= 33.4 MHZ, f
SCI
= 33.16 MHz,
SC2
5.5 MHz output signal
–3dB Pin 1–16
+1dB Pin 1–16
= 10 mV, Pin 12
1–16
SC unmodulated,
5.5 MHz signal
5.74 MHz signal
v
i
v
i
v 250
AM-Demodulation
50
80
110
m
V
mV
mV
Parameters Test Conditions / Pin Symbol Min. Typ. Max. Unit
Minimum input voltage Audio output signal –3dB
DC output voltage v
DC output current V6 = 7.5 V, V
Distortion v
AF output voltage v
=
Pin 1–16
= 10 mV,
1–16
unmodulated Pin 6
= 3.5 V
3
Pin 6
= 10 mV, m =80 %,
1–16
f
= 1 kHz Pin 6 d 1.5 3.0 %
mod
= 10 mV, m = 80 %,
1–16
f
= 1 kHz Pin 6 v 850 mV
mod
v 50
V 4.1 V
0.65 mA
m
Rev . A1: 14.09.19954 (8)
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TELEFUNKEN Semiconductors
TDA4445A/TDA4445B
Figure 3. Quasi parallel sound operation
Rev . A1: 14.09.1995 5 (8)
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TDA4445A/TDA4445B
TELEFUNKEN Semiconductors
Figure 4. Bistandard operation
Rev . A1: 14.09.19956 (8)
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TELEFUNKEN Semiconductors
Dimensions in mm
Package: DIP16
TDA4445A/TDA4445B
94 9128
Rev . A1: 14.09.1995 7 (8)
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TDA4445A/TDA4445B
TELEFUNKEN Semiconductors
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423
Rev . A1: 14.09.19958 (8)
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