TEA6821T Просмотр технического описания (PDF) - Philips Electronics

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TEA6821T

ICE car radio

Philips Electronics 

Philips Semiconductors

ICE car radio

Preliminary specification

TEA6821T

SYMBOL

PARAMETER

CONDITIONS

High-cut control (see Fig.22)

τdeemph

control range of de-emphasis

V18 − 0.75V21 control voltage

τdeemph = 50 µs

τdeemph = 80 µs

The nominal de-emphasis value can be changed to 75 µs with C31, C32 = 10 nF.

Voltage controlled oscillator

The VCO is adjusted by means of a digital auxiliary PLL.

fosc

oscillator frequency range

Noise blanker

Interference detection at pin 50 level unweighted or MPXOUT (pin 47)

Tsup

interference suppression time

fc

high-pass input filter for interference 3 dB frequency

pulse, 2nd order

IAC control

I51

charge current (into 4 V)

discharge current (from 8.5 V)

Vpulse

∆VDC (pin 51)

Vtr (pin 46)

∆VDC (pin 51)

Vtr (pin 46)

Ios

trigger sensitivity

trigger threshold measured with

fint = 250 kHz

gate input offset current at pins 31

and 32 during suppression pulse

duration

τpulse = 10 µs

Vnoise (pin 46) = 10 mV

VDC (pin 51) = 7.7 V

Vnoise (pin 46) = 100 mV

VDC (pin 51) = 6.7 V

MIN. TYP. MAX. UNIT

50

−

80

µs

0

−

−

mV

−

−300 −

mV

450 456 462 kHz

−

40

50

µs

150 200 250 kHz

5.0 10

18

µA

−0.5 −1.0 −1.8 mA

−

−

20

mV

−

200 −

mV

−

10

−

mV

−

2.3 −

V

−

100 −

V

−

20

50

nA

September 1993

18

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