BU1924 / BU1924F / BU1924FS
Audio ICs
RDS / RBDS decoder
BU1924 / BU1924F / BU1924FS
The BU1924, BU1924F and BU1924FS 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
Limits
Symbol
Unit
Conditions
Power supply voltage
VDD
−0.3~+7.0
V
VDD1 VDD2
Maximum input voltage
VMax.
−0.3~VDD+0.3
V
All input pins
Maximum output voltage
IMax.
±4.0
mA
All output pins
1000∗1(BU1924)
Power dissipation
Pd
300∗2(BU1924F)
mW
−
500∗3(BU1924FS)
Operating temperature
Topr
−40~+85
°C
−
Storage temperature
Tstg
−55~+125
°C
−
∗1 Reduced by 10.0mW for each increase in Ta of 1°C over 25°C.(BU1924)
∗2 Reduced by 3.0mW for each increase in Ta of 1°C over 25°C.(BU1924F)
∗3 Reduced by 5.0mW for each increase in Ta of 1°C over 25°C.(BU1924FS)
Recommended operating conditions (Ta = 25°C)
Parameter
Power supply voltage
Symbol
Min.
Typ.
Max.
Unit
VDD1
2.7
−
5.5
V
VDD2
2.7
−
5.5
V
1/5
