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 IF SECTION
Tamb = 25°C, VCCIF = 5 V, VCC2 = 8V, IF input =10 mVRMS (at sync level for negative modulation, or at
peak white level for positive modulation).
Video modulation DSB, D = 90% and fSC = 33.4 MHz in B/G, D = 95% in L, fPC = 38.9 MHz.
Video Bandwidth = 5 MHz, AF = 1 kHz, Audio Bandwidth = 20 kHz, FMdev = ±27 kHz.
Volume Attenuation = 0 dB, AM carrier input: 10 mVRMS, 54% modulated unless otherwise specified.
4.4.1 PIF Amplifier
Symbol
VINPIF
RINPIF
CINPIF
GR
VMax.
Parameter
Input Sensitivity
Differential Input Resistance
Differential Input Capacitance
Gain Control Range
Maximum Input Signal
Test Conditions
-1dB at Video Output (INTCVBSOUT)
PIF Inputs.
PIF Inputs.
Min.
75
1.5
1.5
+1dB at Video Output (INTCVBSOUT) 0.12
Typ.
85
2
2
65
0.15
Max.
95
2.5
2.5
Unit
µVRMS
kW
pF
dB
VRMS
4.4.2 PIFAGC Negative Modulation
Symbol
IC
ID
IC/ID
Parameter
Charging Current at AGCPIFCAP Pin
Discharging Current at AGCPIFCAP
Pin
Charging/Discharging Current Ratio
Test Conditions
Min. Typ. Max. Unit
450 675 900 µA
10 15 20 µA
41 45 49
4.4.3 PIFAGC Positive Modulation
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
IC
Charging Current at AGCPIFCAP Pin
ID
Discharging Current at AGCPIFCAP
Pin
1.75 2.5 3.25 mA
0.15 0.25 0.35 µA
ICP
Additional Charging Current at
AGCPIFCAP Pin
L mode in case of missing VITS
pulses and no white in Video con- 2.8 4 5.2 µA
tent
THICP
IDP
THIDP
Threshold for additional charging cur- Referred to nominal black level
rent
2.3 VPP at INTCVBSOUT Pin
Additional Discharging Current
Threshold for additional discharging Referred to nominal black level
current
2.3 VPP at INTCVBSOUT Pin
160
mV
20 30 40 µA
-345
mV
4.4.4 Tuner AGC
Symbol
IAGCT
SAGCT
IAGCP
AGCST
STT
Parameter
Test Conditions
Maximum Sinked Current
Reg 03 (D7, D6)
00
Tuner AGC Slope (current)
01
10
11
Maximum Tuner plus Sinked Current (See Note 1)
Tuner AGC Starting Point (IF input
related signal)
Reg 03 (D5 to D0 = 10 0000)
Reg 03 (D5 to D0 = 00 0000)
Reg 03 (D5 to D0 = 11 1111)
Variation of take over point with tem-
perature
Min.
1.5
Typ.
2
50
95
170
270
40
12
2
80
Max.
2.5
Unit
mA
µA/dB
mA
mVRMS
0.03 0.07 dB/K
27/86
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