TEA6821T Philips Semiconductors, TEA6821T Datasheet - Page 18

• Manufacturer Part Number: TEA6821T
• Description: ICE car radio
• Manufacturer: Philips Semiconductors

Philips Semiconductors
September 1993
High-cut control (see Fig.22)
V
The nominal de-emphasis value can be changed to 75 s with C
Voltage controlled oscillator
The VCO is adjusted by means of a digital auxiliary PLL.
f
Noise blanker
Interference detection at pin 50 level unweighted or MPXOUT (pin 47)
T
f
IAC control
I
V
V
V
I
osc
c
51
os
deemph
sup
V
V
18
pulse
tr
tr
ICE car radio
SYMBOL
DC
DC
(pin 46)
(pin 46)
0.75V
(pin 51)
(pin 51)
21
control range of de-emphasis
control voltage
oscillator frequency range
interference suppression time
high-pass input filter for interference
pulse, 2nd order
charge current (into 4 V)
discharge current (from 8.5 V)
trigger sensitivity
trigger threshold measured with
f
gate input offset current at pins 31
and 32 during suppression pulse
duration
int
= 250 kHz
PARAMETER
3 dB frequency
V
V
V
V
deemph
deemph
pulse
noise
DC
noise
DC
18
(pin 51) = 7.7 V
(pin 51) = 6.7 V
= 10 s
(pin 46) = 10 mV
(pin 46) = 100 mV
CONDITIONS
= 50 s
= 80 s
31
, C
32
= 10 nF.
50
0
450
150
5.0
MIN.
0.5
200
10
2.3
100
456
40
200
10
20
Preliminary specification
TYP.
300
1.0
TEA6821T
80
462
50
250
18
20
50
MAX.
1.8
mV
mV
kHz
kHz
mA
mV
mV
mV
V
V
nA
UNIT
s
s
A