I am looking to develop / build an AM stereo decoder, for 455kHz.

1. Can anyone point to a reference of how to decode CQUAM using
standard RF building blocks (eg. multipliers, PLLs, filters).

2. Motorola seemed to make IC CQUAM stereo decoders (MC13320, MC13322,
MC13328). Does anyone know if these are still available, and if so,
WTB?

3. Does anyone have any datasheets on the chips mentioned above?

Cheers,

Steve A