BU1924 / BU1924F
Audio ICs
RDS / RBDS decoder
BU1924 / BU1924F
The BU1924 and BU1924F 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.
!Applications
RDS / RBDS compatible FM receivers for American and European markets, car stereos, high-fidelity stereo systems and
components, and FM pagers.
!Features
1) Low current.
2) Two-stage anti-aliasing filter (LPF).
3) 57kHz band-pass filter.
4) DSB demodulation (digital PLL).
5) Quality indication output for demodulated data.
!Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits ConditionsUnit
Power supply voltage VDD −0.3~+7.0 V
Maximum input voltage VMax. −0.3~VDD+0.3 V
Maximum output voltage IMax. ±4.0 mA
Power dissipation Pd 350
∗
mW
Operating temperature Topr −40~+85 °C
Storage temperature Tstg −55~+125 °C
VDD1 VDD2
All input pins
All output pins
∗Reduced by 3.5mW for each increase in Ta of 1°C over 25°C.
−
−
−
!Recommended operating conditions (Ta = 25°C)
Parameter
VDD1 4.5 5.5 V−
Power supply voltage
VDD2 4.5 5.5 V−
Symbol Min. Typ. Max. Unit