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SAA6581T

RDS/RBDS demodulator

Philips Electronics 

Philips Semiconductors

RDS/RBDS demodulator

Product specification

SAA6581T

Table 1 Control pin SYNC

SYNC

LOW

HIGH

ARI CLAMPING

internal ARI clamping disabled

ARI clamping allowed to be logged

Table 2 Control pins TCON and MODE

TCON

HIGH

HIGH

MODE

LOW

HIGH

OSCILLATOR FREQUENCY

4.332 MHz

8.664 MHz

SIGNAL QUALITY DETECTION

Output QUAL indicates the safety of the regenerated RDS

data (HIGH = ‘good’ data; LOW = ‘unsafe’ data).

Oscillator and system clock generator

For good performance of the bandpass and demodulator

stages, the demodulator requires a crystal oscillator with a

frequency of 4.332 or 8.664 MHz. The demodulator can

operate with either frequency (see Table 2), so that a radio

set with a microcontroller can run, in this case, with one

crystal only. The demodulator oscillator can drive the

microcontroller, or vice versa.

The clock generator generates the internal 4.332 MHz

system clock and timing signal derivatives.

Power supply and internal reset

The demodulator has separate power supply inputs for the

digital and analog parts of the device. For the analog

functions an additional reference voltage (1⁄2VDDA) is

internally generated and available via the output pin Vref.

The demodulator requires a defined reset condition. The

demodulator generates automatically a reset signal after

the power supply VDDA is switched on, or at a voltage-drop.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134).

SYMBOL

VDD

Vn

Ii

Ilu(prot)

Tamb

Tstg

Ves

PARAMETER

CONDITIONS

MIN.

supply voltage

voltage at pins 1 to 4, 7 to 10, and

13 to 16 with respect to pins 6 and 11

input current at pins 1 to 5, 7 to 11 and

13 to 16

latch-up protection current in pulsed

mode

ambient temperature

storage temperature

electrostatic handling voltage

pins 5 and 12 are

connected to VDD

pins 6 and 11 are

connected to ground

Tamb = −40 to +85 °C with

voltage limiting −2 to +10 V

Tamb = 25 °C with voltage

limiting −2 to +12 V

Tamb = −40 to +85 °C

without voltage limiting

note 1

note 2

0

−0.5

−10

−100

−200

−10

−40

−65

−4 000

−500

MAX.

UNIT

6.5

V

VDD + 0.5 ≤ 6.5 V

+10

mA

+100

mA

+200

mA

+10

mA

+85

°C

+150

°C

+4 000

V

+500

V

Notes

1. Human body model (equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor).

2. Machine model (equivalent to discharging a 200 pF capacitor through a 0 Ω series resistor and 0.75 µH inductance).

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

Rth(j-a)

thermal resistance from junction to ambient in free air

VALUE

104

UNIT

K/W

2001 May 07

5

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