TDA3857 Datasheet, PDF (7/14 Pages) NXP Semiconductors – Quasi-split sound processor with two FM demodulators

Philips Semiconductors
Quasi-split sound processor with two FM demodulators
Product specification
TDA3857
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Q_L
V_{10, 11}
Q-factor of resonance circuit
DC voltage (pins 10 and 11)
Q_o = 90
−
40
−
−
V_P − 1 −
V
Intercarrier mixer output (pin 15)
V_{o (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
V_VID/V₁₅ residual video AM on intercarrier
note 1
−
V_{VC (RMS)} residual vision carrier (RMS value)
1st/2nd harmonic
−
(38.9/77.8 MHz)
R₁₅
output resistance (emitter follower)
1 mA emitter current
−
I_o
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)
V_{i (RMS)}
R_{13, 17}
V_{13, 17}
V_{i (RMS)}
∆V_i
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 V_{i IF (RMS)} = 10 mV (f_mod = 1 kHz, deviation
∆f = ±50 kHz) at pins 13 and 17 without ceramic filters, R_s = 50 Ω.
De-emphasis 50 µs.
Q_L-factor = 11 for resonant circuits at pins 4-5 and 8-9 (including IC).
V_{IC (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
V_{o (RMS)}
AF output signals
(RMS values, pins 6 and 7)
0.84 0.95 1.07 V
∆V_o
difference of AF signals between
note 2
channels (pins 6 and 7)
−
−
1
dB
R_{6, 7}
output resistance
75
100 130 Ω
V_{6, 7}
DC voltage
1.8
2.1 2.4 V
June 1994
7