STV2247H View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STV2247H Datasheet PDF : 86 Pages
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STV224XH/228XH/223XH - ELECTRICAL CHARACTERISTICS
4.4.7 SIF Amplifier
Symbol
Parameter
VINSIF SIF Input Sensitivity
GRSIF
CINSIF
RINSIF
Gain Control Range
Differential Input Capacitance
Differential Input Resistance
Test Conditions
Min.
- 3dB at AM/FMOUT Pin (see Note 5)
AM output amplitude,
FM subcarrier amplitude
- 3dB to +1dB at AM/FMOUT Pin
SIF Inputs (see Note 6)
1.5
SIF Inputs
1.5
Typ.
55
40
60
2
2
Max.
2.5
2.5
Unit
µVRMS
dB
pF
kW
Note 5: L standard Sc/Pc = -10 dB, Nyquist Pc = -6 dB, SIF input -4 dB with PIF input = 84 µV, BG standard Sc/Pc = -
13 dB, Nyquist Pc = -6 dB, SIF input -7 dB with PIF input = 85 µV.
Note 6: This parameter is not tested during production. It is tested on the validation bench during the qualification phase.
4.4.8 SIF AGC (FM)
Symbol
IC
ID
Parameter
Charging Current
Discharging Current
Test Conditions
Min. Typ. Max. Unit
2.4
mA
100
µA
4.4.9 SIF AGC (AM)
Symbol
INORMAL
IFAST
Parameter
Charging/Discharging Current
Charging/Discharging Current
Test Conditions
Normal time constant
Fast time constant
Min. Typ. Max. Unit
±6
µA
±2.4
mA
4.4.10 FM Demodulator
Electrical parameter valid in both QSS and Intercarrier modes, unless otherwise specified.
Symbol
SIFMin
VOAF
DFMX
_norm
DFMX
_w_qss
THD_FM
S/N
AMR
SVR
S/N
vsvideo
Parameter
Min. Broadcast Sound/Video Carri-
er Ratio
FM Audio Output Amplitude at AM/
FMOUT Pin
Maximum FM Deviation
Maximum FM Deviation
Total Harmonic Distortion
Audio S/N
Amplitude Modulation Rejection
Supply Voltage Rejection
S/N versus picture content, Inter-
carrier mode
Test Conditions
Intercarrier mode: SAW filter K2955M
at SNR 35 dB
FM dev = ±27 kHz BGDKI
FM dev = ±13.5 kHz MN
THD < 10%, normal audio mode,
AF = 1 kHz
QSS mode, Audio FM Wide mode
(reg 04h, d3d2 = 11),
AF = 1 kHz
FM dev = ±27 kHz BGDKI
Weighted according to CCIR468-4
Quasi-Peak
m = 30%, AF = 1 kHz
See Note 4
Intercarrier mode: SAW filter K2955M
Black picture,
White picture,
250 kHz squarewave
Min.
400
Typ.
-30
500
200
400
0.3
55
32
45
52
50
52
Max. Unit
dB
630 mVRMS
kHz
kHz
1
%
dB
dB
dB
dB
4.4.11 De-emphasis
Symbol
Parameter
deemp-T1 De-emphasis Time Constant
deemp-T2 De-emphasis Time Constant
Test Conditions
B,G,D,K,I standards
M, N, standards
Min. Typ. Max. Unit
50
µs
75
µs
29/86
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