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參數(shù)資料
| 型號(hào)： | TDA7405TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, ROHS COMPLIANT, TQFP-44 |
| 文件頁(yè)數(shù)： | 25/58頁(yè) |
| 文件大?。?/td> | 762K |
| 代理商： | TDA7405TR |
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TDA7405
The stereodecoder-part of the A631 (see Figure 28) contains all functions necessary to demodulate the MPX-
signal like pilottone-dependent MONO/STEREO-switching as well as "stereoblend" and "highcut". Adaptations
like programmable input gain, roll-off compensation, selectable deemphasis time constant and a programmable
fieldstrength input allow to use different IF-devices.
10.1 Stereodecoder-Mute
The A631 has a fast and easy to control RDS-Mute function which is a combination of the audioprocessor's Soft-
Mute and the high-ohmic mute of the stereodecoder. If the stereodecoder is selected and a SoftMute command
is sent (or activated through the SM-pin) the stereodecoder will be set automatically to the high-ohmic mute con-
dition after the audio-signal has been softmuted. Hence a checking of alternate frequencies could be performed.
Additionally the PLL can be set to "Hold"-mode, which disables the PLL input during the mute time. To release
the system from the mute condition simply the unmute-command must be sent: the stereodecoder is unmuted
immediately and the audioprocessor is softly unmuted. Figure 30 shows the output-signal VO as well as the in-
ternal stereodecoder mute signal. This influence of SoftMute on the stereodecoder mute can be switched off by
setting bit 3 of the SoftMute byte to "0". A stereodecoder mute command (bit 0, stereodecoder byte set to "1")
will set the stereodecoder in any case independently to the high-ohmic mute state.
If any other source than the stereodecoder is selected the decoder remains muted and the MPX-pin is connect-
ed to Vref to avoid any discharge of the coupling capacitor through leakage currents. No further mute command
should be applied.
Figure 30. Signals during stereodecoder's SoftMute
Figure 31. Signal-Control via SoftMute-Pin
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