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| 型號(hào)： | TDA4455 |
| 英文描述： | Schottky Rectifier; Forward Voltage:0.45V; Forward Current:2A; Repetitive Reverse Voltage Max, Vrrm:20V; Package/Case:DO-220AA; Peak Surge Current:50A |
| 中文描述： | 多標(biāo)準(zhǔn)資料表格放大器和鎖相環(huán)解調(diào)器 |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大小： | 158K |
| 代理商： | TDA4455 |
TELEFUNKEN Semiconductors
TDA4455
Preliminary Information
Rev. A1: 08.05.1995
5 (12)
Unit
Max.
Typ.
Min.
Symbol
Test Conditions / Pins
Parameters
ááááááááááááááááááááááááááááá
á
ááááááááá
á
ááááááááááááááááááááááááááá
between black and white
á
ááááááááá
á
áááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááááá
Control voltage B/G
Note 6
ááááááááááááááááááááááááááááá
Input selector switch
Pin 16
Control voltage – input 1
active
Control voltage – input 2
active
f = 38.9 MHz
Upsetting factor of sync
pulse in the AGC range
á
ááááááá
ááááááá
á
Below sync level
V
sw1
V
sw2
V
sw3
á
V
res1
res2
Vsync
áá
áá
á
V
lim1
áá
2.5
0
5.0
á
áá
áá
áá
áá
á
2
áá
áá
áá
áá
4.0
1.5
V
s
á
áá
áá
áá
250
áá
V
V
V
á
mV
áá
áá
áá
áá
á
Ultra black limiting
Ultra white limiting
threshold
á
á
á
á
á
á
á
á
á
á
á
á
ááááááááááááááááááááááááááááá
áá
mV
Control voltage L
á
á
Above ultra white level
á
á
á
á
á
ááááááááááááááááááááááááááááá
Note 7
5.0
V
S
V
0
2.5
V
Notes
1.
A peak white value for at least 10
μ
s must be trans-
mitted for each complete frame
2.
Loop filter: R1 = 500 – 1 k, C1 = 0.47 F
Capacitor VCO circuit: C
VCO
= 27 – 47 pF
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
automatically selected
7.
Without control voltage at Pin 16 – input 1 is auto-
matically active
Alignment of the VCO
1.
Apply 4.5 V to Pin 6, to disable the broadband
amplifier.
2.
Measure the dc-voltage at Pin 12 (phase detector).
3.
Apply a 38.9 MHz unmodulated carrier signal to the
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.
4.
Adjust the VCO circuit until at Pin 12 is the same DC-
voltage as measured in step 2.
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