TDA1001B Philips Semiconductors, TDA1001B Datasheet - Page 8

• Manufacturer Part Number: TDA1001B
• Description: Interference and noise suppression circuit for FM receivers
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Notes to application information
1. The interference suppression and noise feedback control thresholds can be determined by R13 or a capacitive
2. The suppression pulse duration is determined by C11 = 2,2 nF and R11 = 6,8 k .
3. The characteristic of the noise feedback control is determined by R12 (and R10).
4. The feedback control of the interference suppression threshold at higher repetition frequencies is determined by R10
5. The 19 kHz generator can be adjusted with R
6. Measuring conditions:
December 1982
Noise threshold feedback control (notes 1 and 3)
Noise input voltage (r.m.s. value) f = 120 kHz
sinewave for V
for V
for V
Amplification control voltage by interference intensity
(note 4)
Interference and noise suppression circuit
for FM receivers
at R13 = 0
at R13 = 2,7 k
at R13 = 0
at R13 = 2,7 k
at R13 = 0
at R13 = 2,7 k
V
V
at repetition frequency f
at repetition frequency f
voltage divider at the input of the high-pass filter and they are defined by the following formulae:
V
V
(and R12).
tolerances are used e.g. R < 1% and C < 2%.
The peak output noise voltage (V
grounded).
i(rms)
i(tr)M
s (R = 5 k , C = 10 nF); the reference value of 0 dB is V
i(tr)
ni
12-9
12-9
= (1
= (1
= 300 mV; r.m.s. value
= 425 mV (V
= 560 mV (V
= 50 mV; f = 19 kHz;
R13/R
R13/R
12-9
= 300 mV
PARAMETER
S
S
i(tr)O
i(tr)O
)
)
V
V
+ 3 dB)
+ 20 dB)
r
r
i(tr)O
niO
= 1 kHz
= 16 kHz
in which R
in which R
no m
, CCITT filter) shall be measured at the output with a de-emphazing time T = 50
S
S
= 2 k ;
= 2 k .
7-16
(and R
V
V
V
V
V
V
V
V
ni(rms)
ni(rms)
ni(rms)
ni(rms)
ni(rms)
ni(rms)
o6(rms)
o6(rms)
8
7-8
SYMBOL
o int
). Adjustment is not required if components with small
with the 19 kHz generator short-circuited (pin 7
2,3
33
49
45
MIN.
3,3
8,2
7,3
16,5
45
107
TYP.
TDA1001BT
Product specification
4,3
57
56
65
TDA1001B
MAX.
mV
mV
mV
mV
mV
mV
mV
mV
UNIT