TDA3857 データシートの表示（PDF） - Philips Electronics
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TDA3857 Datasheet PDF : 14 Pages
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Philips Semiconductors
Quasi-split sound processor with two FM demodulators
Product specification
TDA3857
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
QL
V10, 11
Q-factor of resonance circuit
DC voltage (pins 10 and 11)
Qo = 90
−
40
−
−
VP − 1 −
V
Intercarrier mixer output (pin 15)
Vo (RMS)
output signal for 5.5 MHz (RMS value)
71
output signal for 5.74 MHz (RMS
32
value)
B
IF bandwidth
−1 dB
6
−3 dB
7
VVID/V15 residual video AM on intercarrier
note 1
−
VVC (RMS) residual vision carrier (RMS value)
1st/2nd harmonic
−
(38.9/77.8 MHz)
R15
output resistance (emitter follower)
1 mA emitter current
−
Io
allowable AC output current (pin 15)
−
I15
allowable DC output current
−
V15
DC voltage
LC-circuit at pin 10, 11 1.5
adjusted to minimum
video content at pin 15
95
125 mV
43
56
mV
8.5 −
10
−
3
10
0.5 1
MHz
MHz
%
mV
30
−
Ω
−
±0.7 mA
−
−2
mA
1.75 2.0 V
Limiting amplifiers (pins 13 and 17)
Vi (RMS)
R13, 17
V13, 17
Vi (RMS)
∆Vi
minimum input signal (RMS value)
−3 dB AF signal
−
maximum input signal (RMS value)
200
input resistance
450
DC voltage
−
level detector threshold for no muting only 5.74 MHz channel 0.8
(RMS value, pin 17)
hysteresis of level detector
4
300 450 µV
−
−
mV
560 700 Ω
0
−
V
1.2 1.7 mV
7
12
dB
FM1 and FM2 demodulators
Measurements with FM IF input signals of 5.5 MHz and 5.74 MHz with Vi IF (RMS) = 10 mV (fmod = 1 kHz, deviation
∆f = ±50 kHz) at pins 13 and 17 without ceramic filters, Rs = 50 Ω.
De-emphasis 50 µs.
QL-factor = 11 for resonant circuits at pins 4-5 and 8-9 (including IC).
VIC (RMS)
intercarrier signals
(RMS values, pins 4-5 and 8-9)
−
100 −
mV
V
DC voltage (pins 4, 5, 8 and 9)
−
1.8 −
V
Vo (RMS)
AF output signals
(RMS values, pins 6 and 7)
0.84 0.95 1.07 V
∆Vo
difference of AF signals between
note 2
channels (pins 6 and 7)
−
−
1
dB
R6, 7
output resistance
75
100 130 Ω
V6, 7
DC voltage
1.8
2.1 2.4 V
June 1994
7
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