STV2246 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STV2246 Datasheet PDF : 86 Pages
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STV224X, STV228X, STV223X - 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
Parameter
Test Conditions
Min. Typ. Max. Unit
VINPIF Input Sensitivity
RINPIF Differential Input Resistance
-1dB at Video Output (INTCVBSOUT) 75 85 95 µVRMS
PIF Inputs.
1.5 2 2.5 kΩ
CINPIF Differential Input Capacitance
PIF Inputs.
1.5 2 2.5 pF
GR Gain Control Range
VMax. Maximum Input Signal
65
+1dB at Video Output (INTCVBSOUT) 0.12 0.15
dB
VRMS
t(s) 4.4.2 PIFAGC Negative Modulation
Symbol
c IC
du ID
ro 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
P 4.4.3 PIFAGC Positive Modulation
te Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
le IC
Charging Current at AGCPIFCAP Pin
o ID
Discharging Current at AGCPIFCAP
Pin
1.75 2.5 3.25 mA
0.15 0.25 0.35 µA
bs 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
- O THICP
) IDP
t(s 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
uc 4.4.4 Tuner AGC
d Symbol
ro IAGCT
P SAGCT
leteIAGCP
bso AGCST
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)
Min.
1.5
Typ.
2
50
95
170
270
40
12
2
80
Max.
2.5
Unit
mA
µA/dB
mA
mVRMS
STT
Variation of take over point with tem-
perature
0.03 0.07 dB/K
27/86
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