Audio ICs
RDS / RBDS decoder
BU1920 / BU1920F / BU1920FS
The BU1920, BU1920F and BU1920FS are RDS / RBDS decoders that employ a digital PLL. It has a built-in anti-aliasing filter and an eight-stage BPF (switched-capacitor filter). Linear CMOS circuitry is used for low current dissipation.
FApplications RDS / RBDS compatible FM receivers for Europe and North America, car stereo systems, home stereo systems and FM pagers.
FFeatures 1) Low current dissipation. 2) Two-stage anti-aliasing filter. 3) 57kHz bandpass filter.
4) DSB demodulation (digital PLL). 5) ARI signal discrimination. 6) Quality indication output for demodulated data.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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Audio ICs
FBlock diagram Application example
BU1920 / BU1920F / BU1920FS
Pin assignments
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Audio ICs
FPin descriptions
BU1920 / BU1920F / BU1920FS
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Audio ICs
FInput / output circuits
BU1920 / BU1920F / BU1920FS
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Audio ICs
BU1920 / BU1920F / BU1920FS
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VDD = 5.0V and GND = 0.0V)
Filter block
Demodulator block
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Audio ICs
FOutput data timing
BU1920 / BU1920F / BU1920FS
The clock (RCLK) frequency is 1187.5Hz. Depending on the state of the internal PLL clock, the data (RDATA) is replaced in synchronous with either the rising or falling edge of the clock. To read the data, you may
choose either the rising or falling edge of the clock as the reference. The data is valid for 416.7µs, after the reference clock edge.
QUAL pin operation: Indicates the quality of the demodulated data. (1) Good data : HI (2) Poor data : LO ARI pin operation: ARI / RDS discrimination. (1) ARI : LO (2) RDS + ARI : LO (3) RDS : HI (4) No signal : unstable FElectrical characteristics curve
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