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参数资料
| 型号： | TDA6930X |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 接收器 |
| 英文描述： | AM, AUDIO/VIDEO DEMODULATOR, PDSO28 |
| 封装： | PLASTIC, DSO-28 |
| 文件页数： | 8/36页 |
| 文件大小： | 822K |
| 代理商： | TDA6930X |
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Functional Description
3 - 8
TDA 6930
Wireless Components
Specification, August 1999
s
AM-Audio Sound demodulation
The AM-sound section uses the envelope detector of the AGC to demodu-
late the AM sound signal. An optimized special AM-sound demodulator and
the envelope detector garantee an extremely low AF output destortion. In
case of L or L‘ standard the AM-AF output is active, in other standards this
output is inactive.
According to the standard switches FM/NICAM and/or AM processing is per-
formed.
s
AFC + Adjust
The AFC consists of a high inpedance input comparator who gets its control
voltage from the loopfilter / VCO charge pump capacitor. Its OTA output volt-
age swing and gain can be controlled via the necessary external load resis-
tors
The adjust is controlled by norm switch inputs and is only aktive in L‘ mode.
The operation is performed by controlling the reference input voltage of the
AFC comparator.
s
Switches
The internal I2L norm switch decoding logic is buffered by PNP comparator
interfaces with hysteresis.
Therefore the input signal voltage margin at SSW1 and SSW2 is 0 - vcc
s
Voltage reference
The reference voltage is performed by a temperature compensated band-
gap structure with extremly low noise and high ripple rejection (PSSR). The
reference voltage distribution is done by 3 buffer amplifiers with extremly
high ripple rejection (PSSR).
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