tda4455 ATMEL Corporation, tda4455 Datasheet - Page 5

• Manufacturer Part Number: tda4455
• Description: Multistandard Amplifier Demodulator
• Manufacturer: ATMEL Corporation

Rev. A1: 08.05.1995
Notes
1. A peak white value for at least 10 s must be trans-
2. Loop filter: R1 = 500
3. Pin 7 unloaded
4. Residual carrier: 10% carrier amplitude
5. Blanking level: 30% carrier amplitude
6. Without control voltage at Pin 11 – standard B/G is
7. Without control voltage at Pin 16 – input 1 is auto-
TELEFUNKEN Semiconductors
IF residual voltage
f = 38.9 MHz
f = 77.8 MHz
Upsetting factor of sync
pulse in the AGC range
Tilt of half picture
between black and white
Ultra black limiting
threshold
Ultra white limiting
threshold
Standard switch
Control voltage B/G
Control voltage L
Control voltage D2MAC
Input selector switch
Control voltage – input 1
active
Control voltage – input 2
active
mitted for each complete frame
Capacitor VCO circuit: C
automatically selected
matically active
Parameters
W
– 1 k, C1 = 0.47
VCO
Standard L
Below sync level
Above ultra white level
Note 6
Note 7
Test Conditions / Pins
= 27 – 47 pF
Preliminary Information
Pin 11
Pin 16
m
F
Alignment of the VCO
1. Apply 4.5 V to Pin 6, to disable the broadband
2. Measure the dc-voltage at Pin 12 (phase detector).
3. Apply a 38.9 MHz unmodulated carrier signal to the
4. Adjust the VCO circuit until at Pin 12 is the same DC-
D
Symbol
D
D
Vsync
V
V
V
V
V
Vsync
V
V
amplifier.
IF input (Pins 1–2 or Pins 17–18); adjust the input
level so that the AGC voltage at Pin 6 is between
2.0 V and 2.5 V.
voltage as measured in step 2.
res1
res2
sw1
sw2
sw3
lim1
lim2
Min.
2.5
5.0
5.0
0
0
Typ.
250
500
2
5
3
5
TDA4455
Max.
4.0
1.5
2.5
V
10
V
S
s
Unit
mV
mV
mV
mV
%
%
V
V
V
V
V
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