TDA1581 Просмотр технического описания (PDF) - Philips Electronics

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TDA1581

Decoder for traffic warning (VWF) radio transmissions

Philips Electronics 

Philips Semiconductors

Decoder for traffic warning (VWF) radio

transmissions

Preliminary specification

TDA1581T

APPLICATION INFORMATION (see Fig.3)

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

ViSKon

mBKon

m-m-----BB---KK---oo---fn--f

SK switch-on threshold level

SK switch-on threshold level

SK switch hysteresis

mBK = 60 %

ViSK = 8 mV

−

1.8

−

mV

−

32

−

%

3.0

3.5

4.0

dB

tdSKon

tdSKoff

ViDKon

mDKon

m-m-----DD---KK----oo--f-n-f

SK switch-on delay

SK switch-off delay

DK switch-on threshold level

DK switch-on threshold level

DK switch hysteresis

note 1

note 2

mDK = 30 %

ViDK = 8 mV

−

95

200

ms

380

500

700

ms

−

1.5

−

mV

−

13

−

%

3.1

3.6

4.1

dB

tdDKon

tdDKoff

DK switch-on delay

DK switch-off delay

note 1

note 2

−

750

1000 ms

600

750

1000 ms

Notes to the application information

1. Sequence for measuring switch-on delay times (tdon)

a) Nominal BK or DK input signal at pin 15: Vi(p-p)= 8 mV; f = 57 kHz; modulation-on.

b) Pin 4 of the BK detector (pin 18 of the DK detector) is switched to ground to cause a low signal at the SK output

at pin 3 (DK output at pin 2).

c) tdon commences when the ground connection is removed from pin 4 (pin 18) as the positive-going VoBK signal at

pin 5 (VoDK signal at pin 17) crosses zero.

tdon ends when the positive-going edge of the SK output arrives at pin 15 (DK at pin 2).

2. Sequence for measuring switch-off delay times (tdoff)

a) Nominal operating conditions as in note 1.

b) tdoff commences when the input is switched off as the negative-going VoBK signal at pin 5 (VoDK signal at pin 17)

crosses zero.

tdoff ends when the negative-going edge of the SK output arrives at pin 3 (DK at pin 2).

March 1992

7

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