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| 型號： | TDA8341 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Television IF amplifier and demodulator |
| 中文描述： | AM, VIDEO DISCRIMINATOR, PDIP16 |
| 封裝： | PLASTIC, SOT-38, DIP-16 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 111K |
| 代理商： | TDA8341 |
November 1987
4
Philips Semiconductors
Product specification
Television IF amplifier and demodulator
TDA8340
TDA8341
PINNING
FUNCTIONAL DESCRIPTION
IF amplifier
This is a 3-stage, gain-controlled IF amplifier with a wide dynamic range. On-chip capacitors in the d.c. feedback loop of
the amplifier maintain stability at maximum gain. Internal stabilization of the supply voltage ensures the desired sensitivity
and gain control range over the whole supply voltage range and also gives very good power supply ripple rejection in this
part of the circuit.
Demodulator
The redesigned IF demodulator is a quasi-synchronous circuit that employs passive carrier regeneration and logarithmic
clamping to give improved signal handling. The demodulator input is a.c. coupled to the IF amplifier to reduce d.c. offsets
and thus minimize residual IF carrier in the output signal.
Video amplifier
The linearity and bandwidth of the video amplifier are sufficient to meet all wide band requirements, e.g. for teletext
transmissions. Second harmonics of the IF carrier are effectively reduced by a Sallen-Key low pass interstage filter
between the demodulator output and the video amplifier input. An integrated filter in the noise inverter reduces the
sensitivity of the video amplifier for high sound carriers.
White spot protection comprises a white spot clamp system combined with a delayed-action inverter which is also highly
resistant to high sound carriers.
Note. To prevent radiated video output at the input pins, connect a 6,8
μ
H inductor in series with pin 12 and fit as close
as possible to the IC body. Use short leads.
AGC detector
A Bessel low-pass filter between the video output and the AGC detector improves the detector function in the presence
of high sound carriers. No ‘hang-up’ occurs in the detector after pin 14 has been short-circuited to ground (VCR switch
operated). The detector also generates the sample-and-hold pulse for the AFC system.
1 and 16
2 and 15
3
4
5
6
7 and 10
8 and 9
11
12
13
14
Balanced IF inputs
IF amplifier decoupling
Tuner AGC starting point adjustment
Tuner AGC output
AFC output
AFC on/off switch and sample-and-hold capacitor
Reference carrier
π
/2 rad. phase shift
IF picture carrier passive regeneration
Positive supply voltage (V
CC
)
Video output
Ground (V
EE
)
IF AGC capacitor and VCR switch
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相關(guān)代理商/技術(shù)參數(shù) |
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| TDA8349 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard IF amplifier and demodulator |
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