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參數(shù)資料
| 型號： | 9412AVK |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 14 X 14 MM, 2 MM HEIGHT, PLASTIC, MS-022, MQFP-80 |
| 文件頁數(shù)： | 116/126頁 |
| 文件大小： | 1673K |
| 代理商： | 9412AVK |
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DATA SHEET
Micronas
Aug. 16, 2004; 6251-552-1DS
9
2.1.4. Synchronization
After elimination of the high frequent components of
the CVBS signal by a low pass filter, horizontal and
vertical sync pulses are separated. Horizontal sync
pulses are generated by a digital phase locked loop.
The time constant can be adjusted between fast and
slow behavior in four steps (PLLTC) to accommodate
different input sources (e.g. VCR). The time-constant
can be changed during normal operation without visi-
ble picture degradation. A fine tuning of the PLL time
constant can be done by NSRED.
Additional weak input signals from a satellite dish
(’fish’) become more stable when SATNR is enabled.
Vertical sync pulses are separated by integration of
equalizing pulses. A vertical flywheel mode improves
vertical sync separation for weak signals (VFLYWHL,
VFLYWHLMD).
Additionally, v-syncs may be gated by VTHRL and
VTHRH to reject invalid v-syncs (independently adjust-
able for 50 and 60 Hz sources) if no input signal is con-
nected the device switches to a freeruning mode. The
device can be configured to switch-on background
color when no or only a weak signal is applied (NOS-
IGB). 50 Hz or 60 Hz operation for sync separation
may be forced separately or selected to work automat-
ically (FLNSTRD).
2.1.5. Chroma Decoder
The digital multistandard chroma decoder is able to
decode NTSC and PAL signals with a subcarrier fre-
quency of 3.58 MHz and 4.43 MHz (PAL B*/N/
60,NTSC M/4.4) as well as SECAM signals with auto-
matic standard detection. Alternatively a standard can
be forced. The demodulation is done with a regener-
ated color-carrier. To enable a factory adjustment of
the crystal frequency, the frequency of the regenerated
subcarrier can be adjusted via SCADJ. For this pur-
pose the crystal deviation (SCDEV) can be read out
via I2C after chroma PLL locking (indicated by
SCOUTEN) and can be stored in
C ROM for SCADJ.
For test purposes, CPLLOF allows the opening of the
chroma PLL loop.
For adjustment to the specific operational area an
automatic norm detection is selectable. Available
50 Hz color standards are PAL B, PAL N and SECAM.
Available 60 Hz color standards are NTSC M, PAL M,
PAL60 and NTSC44. For each line standard, one or
more color standards can be enabled for automatic
chroma standard detection. Please refer to Table 2–
3: and Table 2–4: for allowed combinations.
The standard detection process can be set to slow or
fast behavior (LOCKSP). In slow behavior, 25 fields
are used to detect the standard, whereas 15 fields are
used in fast behavior. If the detection was not success-
ful during this time frame, the system will switch to the
next enabled TV Standard.
Table 2–2: Clamping Adjustment
Signal
Description
CLMPST1
Measurement pulse start for ADC1
CLMPD1
Measurement pulse duration for ADC1
CLMPST1S
Clamping pulse start for ADC1
CLMPD1S
Clamping pulse duration for ADC1
CLMPST2
(Measurement pulse start for ADC2)
CLMPD2
(Measurement pulse duration for ADC2)
CLMPST2S
Measure and clamp start for RGBF-ADC (clamping start for ADC2)
CLMPD2S
Measure and clamp duration for RGBF-ADC (clamping duration for ADC2
*
PAL B is representative for PAL B/G/H/I/N
PAL60 and NTSC44 are nonstandard signals which
are generated by some VCR or DVD player
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