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參數(shù)資料
| 型號： | STV2247 |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運(yùn)算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 17/76頁 |
| 文件大?。?/td> | 2157K |
| 代理商： | STV2247 |
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STV223XD/224XC - FUNCTIONAL DESCRIPTION
17/76
3 FUNCTIONAL DESCRIPTION
The STV2238D is an integrated device that proc-
esses PIF, SIF, Video and Chroma signals while
scanning for PAL, SECAM and NTSC standards. It
includes a base band chroma delay line, Video,
SVHS and audio switches.
3.1 DETAILED FEATURES
3.1.1 Power Supplies
V
CCIF
: 5 V power supply dedicated to IF proces-
sors.
V
CCD
: 5 V power supply dedicated to I2C bus and
digital parts. GNDD is the ground reference of
these parts.
V
CC1
: 8 V power supply for video switches, scan-
ning part and the chroma decoder. GND 1 is the
ground reference of all these functions.
V
CC2
: 8 V power supply for the luminance, RGB
processing parts audio switch and internal CVBS
output. GND2 is the ground reference of these
parts.
3.1.2 Picture Intermediate Frequency (PIF)
– AGC amplifier.
– PLL synchronous demodulator. Bus-controlled
VCO for integrated tuning of the external LC res-
onator. For a 38.9 MHz VCO, the LC coil specifi-
cation has to be:
C = 39pF, f = 44 MHz ±2% (LC not connected).
For a 33.9 MHz VCO (L’), the VCO can be
switched via the bus control.
– Digital AFC via bus.
– IF Automatic Gain Control (AGC)
Negative modulation: top sync regulation, regu-
lation of overmodulated signals (overmodulation
regulation circuit enabled through bus control).
Positive modulation: main regulation on white
level with black level limitation.
– Tuner-delayed AGC with bus control for AGC
gain and threshold. When tuner AGC output is
active, read register 03hex, data D7 is set to “1”.
– CVBS output with 2 bus-controlled amplitudes.
CVBS output at 2 V
PP
if external sound trap is
not connected (QSS mode). CVBS output at 2.3
V
PP
if external sound trap is connected (Intercar-
rier mode).
3.1.3 Sound Intermediate Frequency (SIF) and
Sound Demodulators
– QSS structure.
– SIF Automatic Gain Control (QSS mode).
– Built-in sound bandpass.
– PLL FM Demodulator for 4.5, 5.5, 6.0 or 6.5 MHz
carriers. The Sound Standard is selected by the
MCU. The FM demodulator VCO is automatically
calibrated using the chroma crystal VCO refer-
ence frequency. The FM Demodulator VCO is
automatically calibrated for all sound standards
independently of the chroma crystal VCO fre-
quency, which is either 4.4 MHz or 3.5 MHz. For
each sound carrier frequency, the IC sends an
indication of the sound subcarrier level to the
MCU so that it can select the proper standard.
– The sound subcarrier level is valid when the FM
Demodulation VCO is calibrated. This informa-
tion can be read via the I2C Bus.
– Bus controls for FM de-emphasis (50 or 75 μs)
and FM deviation ±25 or ±50 kHz).
– AM demodulator.
– Sound demodulator output: either an AM or FM
signal can be the output for the Mono chassis
– Sound subcarriers for the Stereo chassis.
3.1.4 Audio Switch
– One SCART switch.
– Bus-controlled volume and mute. Zero-crossing
function on volume control.
– Automatic Volume Levelling (AVL) function can
be enabled via the I2C bus. Two time constants
(gain increase) can be selected via the I2C bus.
– The AM sound can be selected on the main au-
dio output for the Stereo chassis.
3.1.5 Surface Acoustic Wave (SAW) Filter
Switch Control
– SAW filter switch control pin is available in the
TQFP64 package. The SAW filter switch control
pin is used to select the correct SAW filter char-
acteristics (e.g.: M/N or BGDK characteristics).
In a multi-standard chassis, two output voltages
are selected via the I2C bus (low level voltage at
0.4 V Max., and high level voltage at 4 V Min.).
3.1.6 Video Switches
– Video switch with three CVBS inputs and one
CVBS output (CVBSOUT1) which may be used
to drive a teletext decoder.
– A second CVBS output (CVBSOUT2) is able to
output recombined Y+C signals.
All switches are independently controlled.
– SVHS switch, Y input is combined with CVBS 3
input. CVBS/SVHS modes can be selected ei-
ther by bus control (software selection), or by
sensing the DC voltage on the Chroma Input pin
(hardware selection). If the Chroma Input is
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|---|---|
| STV2247C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:I2C BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
| STV2247H | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IC BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
| STV2248 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:I2C bus-controlled multistandard single chip TV processor |
| STV2248C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:I2C BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
| STV2248H | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IC BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
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