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TDA2555 Datasheet(PDF) 6 Page - NXP Semiconductors

No. de pieza TDA2555
Descripción Electrónicos  Dual TV sound demodulator circuits
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA2555 Datasheet(HTML) 6 Page - NXP Semiconductors

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March 1986
6
Philips Semiconductors
Product specification
Dual TV sound demodulator circuits
TDA2555
TDA2557
Notes to the characteristics
1. THD
< 0,1% requires a double tuned demodulator circuit (QL = 20). With a single tuned circuit a THD of < 0,5% is
possible (see Fig.1 and Fig.3).
2. If higher a.c. output current is required an external resistor must be applied from output (pins 2 and 8) to ground
(min. 2 k
Ω) in order to improve the THD performance (−I2,8 < 4 mA).
3. The de-emphasis time constant is 50
µs.
4. Crosstalk attenuation is defined as:
5. In the MUTE state the a.f. output level attenuation is more than 60 dB. The MUTE function is only guaranteed for an
r.m.s. value of the input voltage lower than 60 mV. See also Fig.2.
AUDIO OUTPUT STAGE
emitter follower with 1,0 mA bias current
DC output voltage
V2,8-14
3,0
4,0
5,0
V
External DC load resistance
R2,8-14
2
−−
k
AC output current (note 2)
−I2,8-14(p-p)
−−
0,5
mA
De-emphasis input resistance (note 3)
R1,9-14
0,8
1,0
1,2
k
DC voltage (de-emphasis)
V1,9-14
3,7
4,7
5,7
V
Crosstalk attenuation
f = 1 kHz (note 4)
α12,21
60
−−
dB
Crosstalk attenuation
f = 10 kHz (note 4)
α12,21
60
−−
dB
Output impedance
R2,8-14
25
−Ω
AF output level (Fig.2, note 5)
MUTE function
Vi(rms) < 60 mV
α
60
−−
dB
Switching input current
V5-14 =0V
−I5
−−
500
µA
V5-14 =VP
I5
−−
500
µA
Internal d.c. voltage
no mute (pin 5 not connected)
V5-14
6,2
V
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
o
12
V
214
unmodulated
V814
--------------------------------------------------------
=
o
21
V
814
unmodulated
V
214
--------------------------------------------------------
=
.


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