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| 型號： | tda 6930 |
| 廠商： | SIEMENS AG |
| 英文描述： | Multistandard VIF-PLL(多級標(biāo)準(zhǔn)的VIF-PLL) |
| 中文描述： | 多標(biāo)準(zhǔn)資料表格鎖相環(huán)（多級標(biāo)準(zhǔn)的資料表格，鎖相環(huán)） |
| 文件頁數(shù)： | 16/36頁 |
| 文件大小： | 822K |
| 代理商： | TDA 6930 |
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Functional Description
3 - 8
TDA 6930
Wireless Components
Specification, August 1999
I
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.
I
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.
I
Switches
The internal I
2
L 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
I
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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