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參數(shù)資料
| 型號： | TDA4504B |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Small signal combination for multistandard colour TV |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP32 |
| 封裝： | PLASTIC, SOT-201, DIP-32 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 190K |
| 代理商： | TDA4504B |
February 1992
7
Philips Semiconductors
Product specification
Small signal combination for multistandard colour TV
TDA4504B
AGC circuit
For signals employing negative modulation the AGC detector operates on peak sync level but upon peak white content
with those having positive modulation. Selection is facilitated by the system switch (pin 32):
The AGC detector currents are:
With a 6.8
μ
F AGC capacitor, the video tilt will be
<
10% for positively modulated signals and
<
2% for negative
modulation.
To obtain a rapid AGC action when executing a search tuning operation with the circuit set for peak white AGC, the
charge current is held at 55
μ
A until the detection of a transmitted signal.
The transmitter identification
A mute signal is generated to disable the audio preamplifier of an audio demodulator during the absence of a
transmission signal. When the video switch is in the internal mode, the identification of a transmitted signal is derived
from the coincidence detector.
In the external mode the IF part of the circuit has its own identification system. The system relies upon the detection of
sync. pulses on the incoming IF signal. The separated horizontal sync pulse charges the capacitor on pin 25 which drives
the mute output (pin 14).
The connection of a 1 M
resistor between pin 25 and V
CC
results in the mute information being overruled by the
50/60 Hz information derived from the internal vertical divider section
(see 50/60 Hz truth table).
MUTE Truth Table:
pin 32
pin 32
HIGH/open:
LOW:
positive modulation
negative modulation
positive modulation
1
μ
A
3 mA
negative modulation
55
μ
A
1.5 mA
charge
discharge
Input signal
Pins 9 and 10
50 H
z
60 H
z
none
50/60 Hz
50/60 H
z
50/60 H
z
none
pin 25
pin 28
pin 18
9.5 V
50 Hz
LOW
9.5 V
60 Hz
LOW
0.3 V
none
LOW/
HIGH
0.3 V
9.5 V
50 Hz
HIGH
9.5 V
60 Hz
HIGH
9.5 V
none
HIGH
0.3 V
50/60 Hz
HIGH
pin 14
12 V
9 V
12 V
9 V
12 V
0.3 V
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