HTML datasheet архив (поиск документации на электронные компоненты) Поиск даташита (1.687.043 компонентов)
Где искать

Datasheet: U4454B (TEMIC Semiconductors)

Quasi-split-sound Processing and Am-demodulator

 

Скачать: PDF   ZIP
TEMIC Semiconductors
U4454B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 23-Feb-96
1 (7)
Quasi-Split-Sound Processing and AM-Demodulator
Description
The U4454B quasi-split-sound processor is a bipolar
integrated circuit for all FM-TV standards and NICAM
sound systems. For FM/NICAM the IC operates as
QSS-mixer. In case of AM sound the circuit can be used
as AM demodulator.
Features
D PLL intercarrier-mixer for all FM standards
(incl. NICAM sound system)
D High grade signal processing for FM/NICAM
sound systems
D Also suitable as AM-demodulator
D Gain controlled wideband amplifier
D AGC operates as a peak- and mean-level detector
D High input sensitivity
D Wide supply voltage range (6.8 V up to 13 V)
D Low power consumption
D ESD protection
Case: 16-pin DIL plastic
Block Diagram
Lock
detector
90
8
9
VCO
11
Video
Overload
detector
Lock
detector
16
1
IF Input
12
14
6
Output
Interference
rejection
13
Average
7
10
4
15
IF AGC
5
2
NC
3
Loop filter
VCO Tank
+V
S
AGC
+/
93 7653
0
NC
Figure 1.
U4454B
TELEFUNKEN Semiconductors
Rev. A1, 23-Feb-96
Preliminary Information
2 (7)
Pin Description
NC
GND
C
5
V
out
C
7
V
VCO
IF
in
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
95 11256
V
S
C
Ref
LF
LF
GND
V
VCO
IF
in
GND
Pin
Symbol
Function
1
IF
in
IF input
2
NC
Not connected
3
NC
Not connected
4
GND
Ground
5
C
5
IF-AGC time constant
6
V
out
Output for AM (audio frequency) or
FM (intercarrier frequency)
7
C
7
Averaging value (IF-AGC function)
8
V
VCO
VCO circuit
9
V
VCO
VCO circuit
10
GND
Ground
11
LF
PLL loop filter
12
LD
PLL time constant switch
13
C
Ref
Reference voltage (internal use only)
14
V
S
Supply voltage
15
GND
Ground
16
IF
in
IF input
Absolute Maximum Ratings
Reference point Pin 4, unless otherwise specified
Parameters
Symbol
Value
Unit
Supply voltage
Pin 14
V
s
6.8 to 13.0
V
Supply current
Pin 14
I
S
55
mA
Output current
Pin 6
I
out
5.0
mA
Maximum power dissipation
P
720
mW
Junction temperature
T
j
+125
C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
note 1
R
thJA
60
K/W
Ambient temperature
T
amb
25 to +85
C
Storage temperature
T
stg
25 to +125
C
U4454B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 23-Feb-96
3 (7)
Electrical Characteristics
Vs = 8 V, T
amb
= 25
C, reference point Pin 4, unless otherwise stated
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
DC-supply
Pin 14
Supply voltage
V
s
6.8
8.0
13.0
V
Supply current
I
s
45
55
mA
IF-amplifier
Pins 116
Input sensitivity
RMS value
change of output signal at
Pin 6: 3 dB
V
in
80
120
V
RMS
Input impedance
R
in
1.2
k
W
Input capacitance
C
in
2
pF
IF-AGC
Pins 5 and 7
IF gain control range
G
v
60
66
dB
AGC capacitor
C
5
4.7
F
Average capacitor
C
7
0.33
1.0
mF
PLL
Pins 89, 11 and 12
see note 2
PLL capture range
Df
cap
1.5
MHz
VCO-tuning range
Df
vco
3.0
MHz
VCO-tuning sensitivity
Df / Du
3.0
4.5
kHz/mV
FM-mode: Intercarrier mixer operation
Pin 6
see note 3
DC output voltage
V
5
= 4.5 V, v
in
= 0
V
DC
4.2
V
Output resistance
R
out
100
W
Sound IF output voltage
5.50 MHz output voltage
5.74 MHz output voltage
V
in
= 10 mV
V
out
V
out
80
35
120
55
180
80
mV
RMS
mV
RMS
Weighted signal to noise
ratio: (CCIR 468)
Black screen: 1. Channel
2. Channel
Grid pattern: 1. Channel
2. Channel
Grey screen 50%:
1. Channel
2. Channel
ref. signal: v
in
=10 mV,
f
dev
=
"30 kHz,
f
mod
= 1 kHz,
measured with FM demo-
dulator U2831B,
standard B/G modulated IF
signal
(residual carrier 10%);
S/N
S/N
S/N
S/N
S/N
S/N
62
60
52
50
59
58
dB
dB
dB
dB
dB
dB
U4454B
TELEFUNKEN Semiconductors
Rev. A1, 23-Feb-96
Preliminary Information
4 (7)
Unit
Max.
Typ.
Min.
Symbol
Test Conditions / Pins
Parameters
AM mode:
Pin 6
see note 4
DC output voltage
V
5
= 4.5 V, v
in
=0
V
DC
4.2
V
Output resistance
R
out
100
W
AF output voltage
V
o,AF
420
560
750
mV
RMS
Total harmonic distortion
m = 80%
f
mod
= 40 Hz
f
mod
= 1 kHz
f
mod
= 12.5 kHz
THD
3
%
Signal to noise ratio
Reference:
m = 54%
f
mod
= 1 kHz
22 kHz low pass
S/N
65
dB
Ripple rejection
Pin 15/Pin 7
28
dB
Notes
1.
When soldered to PCB
2.
With: VCO-capacitor: C
VCO
= 22 pF;
Loop filter: R
1
= 150
W, C
1
= 470 nF, C
2
= 1.5 nF
3.
Picture carrier PC = 38.9 MHz; sound carrier
SC
1
= 33.4 MHz, SC
2
= 33.16 MHz; PC/SC
1
= 13 dB;
PC/SC
2
= 20 dB; PC unmodulated (equivalent to
sync peak level
4.
Sound carrier SC = 32.4 MHz, modulated with
f
mod
= 1 kHz, m = 54%, V
in
= 10 mV
Alignment of the VCO
1.
Apply 4.5 V to Pin 5, to disable the broadband
amplifier.
2.
Measure the dc-voltage at Pin 11 (phase detector).
3.
Apply a 38.9 MHz unmodulated carrier signal to the
IF input (Pins 116); adjust the input level so that the
AGC voltage at Pin 5 is between 2.5 V and 3.3 V.
4.
Adjust the VCO circuit until Pin 11 has the same
dc-voltage as measured in step 2.
5.
Step 14 is a coarse alignment but sufficient for AM-
mode. For sound optimum in FM-mode adjust for the
minimum buzz at critical test pattern (grid pattern) in
the second sound channel.
U4454B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 23-Feb-96
5 (7)
Typical Application Circuit
16
15
14
13
1
2
3
4
U4454B
12
11
10
5
6
7
9
8
10 nF
22
mF
470 nF
C
1
R
1
150
W
C
2
1.5 nF
12 pF
L
1
15 pF
10 k
W
10 nF
S1
38.9 MHz
32.4 MHz
38.9 MHz
(32.4 MHz)
22
mH
10 k
W
10 nF
4.7
mF
1
mF
IF
+ V
S
TSB 5304
16
15
14
13
1
2
3
4
U2831B
12
11
10
5
6
7
9
8
22 nF
22 nF
SFE
5.74 MC
SFE
5.5 MC
680
W
680
W
22 nF
22 nF
L
2
3.3 nF
2.2 k
W
AF (AM)
4.7
mF
1 k
1 nF
5.74 MHz
3.3 k
W 3.3 kW
15 nF
15 nF
22
mF
22 nF
1 nF
1 k
W
L
3
5.5 MHz
+V
S
= 9 V
AF2
AF1
32.4 MHz
TSB 5307
93 7654
© 2020 • ChipFind
Контакты
Главная страница