HD6433937 Datasheet, PDF (343/521 Pages) Hitachi Semiconductor – Hardware Manual

Synthesizer Programming Control
Receiver
Audio
Audio to Digital
Convertor
Receiver
Control
EXTS1
EXTS0
Low Battery
Detector
LOBAT
This LSI
User
Interface
38.4 clock
76.8 kHz Oscillator
Figure 12-2 Example Block Diagram Using External Demodulator
The FLEX decoder can also be configured to connect to a receiver capable of converting a 4 level
audio signal into a 2 bit digital signal. In this mode, the FLEX decoder has 8 receiver control lines
used for warming up and shutting down a receiver in stages. It also includes configuration settings
for the two post detection filter bandwidths required to decode the two symbol rates of the FLEX
signal. Also when using an external demodulator, the oscillator (or external clock) must be 76.8
kHz and the CLKOUT signal (when enabled) is 38.4 kHz clock output capable of driving other
devices.
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