Audio ICs
RDS / RBDS decoder
BU1923 / BU1923F
The BU1923 and BU1923F are RDS / RBDS decoders that employ a digital PLL ...
Audio ICs
RDS / RBDS decoder
BU1923 / BU1923F
The BU1923 and BU1923F are RDS / RBDS decoders that employ a digital PLL and have a built-in anti-aliasing filter and an eight-stage BPF (switched-capacitor filter). Linear
CMOS circuitry is used for low power consumption.
FApplications RDS / RBDS compatible FM receivers for American and European markets, car stereos, high-fidelity stereo systems and components, and FM pagers.
FFeatures 1) Low current. 2) Two-stage anti-aliasing filter (LPF). 3) 57kHz band-pass filter. FAbsolute maximum ratings (Ta = 25_C)
4) DSB demodulation (digital PLL). 5) Quality indication output for demodulated data.
FRecommended operating conditions (Ta = 25_C)
828
Audio ICs
FBlock diagram
BU1923 / BU1923F
829
Audio ICs
FPin descriptions
BU1923 / BU1923F
FInput / output circuits
830
Audio ICs
BU1923 / BU1923F
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VDD1 = VDD2 = 5.0V, VSS1 = VSS2 = 0.0V)
831
Audio ICs
FOutput data timing
BU1923 / BU1923F
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 ei-
ther 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 FElectrical characteristic cu...