BU1924F Rohm, BU1924F Datasheet

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BU1924F

Manufacturer Part Number
BU1924F
Description
RDS / RBDS decoder
Manufacturer
Rohm
Datasheet

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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)
! ! ! ! Recommended operating conditions (Ta = 25°C)
∗Reduced by 3.5mW for each increase in Ta of 1°C over 25°C.
Power supply voltage
Maximum input voltage
Maximum output voltage
Power dissipation
Operating temperature
Storage temperature
Power supply voltage
Parameter
Parameter
Symbol
Symbol
Topr
V
Tstg
V
I
V
V
Pd
Max.
Max.
DD
DD1
DD2
Min.
2.7
2.7
−0.3~V
−0.3~+7.0
−55~+125
−40~+85
Limits
350
±4.0
Typ.
DD
+0.3
Max.
5.5
5.5
Unit
mW
mA
°C
°C
V
V
Unit
V
V
V
All input pins
All output pins
DD1
V
BU1924 / BU1924F
Conditions
DD2
1/5

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BU1924F Summary of contents

Page 1

... 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 ...

Page 2

... V and V are separated within the IC. DD1 DD2 ∗2 : Have V (digital power supply sufficiently low impedance. DD2 ∗3 : Match the capacitor constants with the crystal manufacturer BU1924 / BU1924F 560p CMP (7) (8) V SS3 comparator RCLK (16) QUAL (1) RDATA (2) Bi-phase Differential decoder decoder ...

Page 3

... Composite signal input (refer to input/output circuits) − C-junction (refer to input/output circuits ) Open or connected to ground Connects to 4.332MHz oscillator (refer to input/output circuits) − 1187.5Hz clock (refer to the timing diagram) Type B Type E + BU1924 / BU1924F Input/Output type Type C Type C Type E Type F − − Type D Type B − ...

Page 4

... Hz − − µs 4 =421µ BU1924 / BU1924F = 5.0V 0.0V) SS1 SS2 SS3 Conditions +I I DD1 DD2 Pin 3 =V MUX V IN DD1 =V MUX V IN SS1 = DD2 = SS2 =−1.0mA RCLK RDATA QUAL ...

Page 5

... FREQUENCY : f ( Fig.1 Band-pass filter characteristics ! ! ! ! External dimensions (Units : mm) BU1924 19.4±0 2.54 0.5±0.1 DIP16 BU1924F 16 7.62 0°~15° BU1924 / BU1924F ± 10.0 0 ± 1.27 0.4 0.1 0.3Min. 0.15 SOP16 5/5 ...

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