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参数资料
| 型号： | TDA6930S |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 接收器 |
| 英文描述： | AM, AUDIO/VIDEO DEMODULATOR, PDIP30 |
| 封装： | SDIP-30 |
| 文件页数： | 7/36页 |
| 文件大小： | 822K |
| 代理商： | TDA6930S |
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Functional Description
3 - 7
TDA 6930
Wireless Components
Specification, August 1999
They have a quick charge circuit which increases the charge current by a
factor of 1500 if the mean value of the signal increases by more than 10 dB.
The time constants of the AGCs can be set by the according external capac-
itor.
s
FPLL
FPLL carrier Recovery
High perfomance in terms of FM sound, digital sound and videotext is
obtained by means of a combined path for carrier recovery and FM/NICAM
SIF (QPT). The input signal for this section is derived from the QPT SIF I/II
input to overcome Nyquist slope distortions in all cases. For L‘-applications
the VCO frequency is switched internally, thus no external tank circuit
switching is necessary. Adjustment of the tank circuit (only necessary for the
AFC) is achieved by aligning the AFC voltage to a certain value except in L‘-
mode. In L‘-mode the AFC needs to be adjusted via control voltage at pin
SSW2.
APC
For best video demodulation a phase locked clean carrier is needed. Due to
differences in the filter and amplifier characteristics of the amplifier channels
it is necessary to align the phase of the recovered carrier to the incoming sig-
nal of VIF port . The possible phase control margin of the therefore used
APC is +180
° to -180 °.
For best performance 2 external low pass capacitors are added at the P-
DSO-32 package. In this case the APC is extremly stable at carrier zero time
and over modulation. This feature is not available in the less than 32 pin
packages .
VCO
The VCO consists of a temperature compensated stacked symmetrical ECL
multivibrator and devider by 2 . The main tank circuit is aligned to twice of
the recovery frequency. All internal signals are of symmetrical ECL type.
This is necessary for small amplitudes with high temperature stability and
low oscillator radiation.
s
Video demodulation + output
Video IF Demodulation
A real synchronous demodulator receives an inphase carrier via the auto-
matic phase control (APC) from the FPLL. Thus, low differential phase and
gain, high intermodulation ratio und good impuls response is achieved with-
outh any aligment.
s
DF-Mixer / FM sound conversion
The SIF-Sound/PIC-carrier section gets its input signal from SIF1 except in
L‘-NICAM mode, then input SIF 2 is active. The SIF- signal is mixed with the
90
°-carrier from the FPLL to generate the 2. sound IF at the according output
(DF). This output is always active except in Mac standard, there both sound
outputs are off.
相关PDF资料 |
PDF描述 |
|---|---|
| TDA6930X | AM, AUDIO/VIDEO DEMODULATOR, PDSO28 |
| TDA6931X | AM, AUDIO/VIDEO DEMODULATOR, PDSO32 |
| TDA6930S | AUDIO/VIDEO DEMODULATOR, PDIP30 |
| TDA6930X | AUDIO/VIDEO DEMODULATOR, PDSO28 |
| TDA6931X | AUDIO/VIDEO DEMODULATOR, PDSO32 |
相关代理商/技术参数 |
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| TDA7000 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:FM radio circuit |
| TDA7010 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:FM radio circuit |
| TDA7010T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:FM radio circuit |
| TDA7010T/V3 | 制造商:NXP Semiconductors 功能描述:FM RADIO CIRCUIT SMD 7010 SOIC16 |
| TDA7010T/V3 | 制造商:NXP Semiconductors 功能描述:FM RADIO CIRCUIT SMD 7010 SOIC16 |
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