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參數(shù)資料
| 型號： | TFP6424PAP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, THERMALLY ENHANCED, POWER, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 20/65頁 |
| 文件大?。?/td> | 813K |
| 代理商： | TFP6424PAP |
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TFP6422, TFP6424
PanelBus
DIGITAL TRANSMITTER/VIDEO ENCODER COMBO
SLDS118 – MARCH 2000
27
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
chrominance encoding (continued)
The frequency, the phase of the modulating subcarrier and the amplitude of the color burst are all
programmable. The S_CARR registers at subaddresses 63,64,65 and 66 control the subcarrier frequency. The
values of the registers are computed based on the desired subcarrier frequency and the internal video encoding
clock CLKENC using the equation in the register description. C_PHASE register at subaddress 5A controls the
phase of the subcarrier. The phase of the color subcarrier is reset to C_PHASE. Four modes of color subcarrier
reset are provided: reset every two lines, every two fields or every eight fields. Users can use C_PHASE register
to adjust SCH (subcarrier to horizontal sync phase). BSTAP[6:0] of BSTAMP register at subaddress 62 sets the
amplitude of the color burst. PAL bit of M_CONTROL register enables Phase Alternation Line encoding. A
sweeping subcarrier is generated to encode the chrominance signal, when PAL bit is set to 1. Otherwise a
normal subcarrier is generated. Phase Alternation Line refers to the encoding scheme in which subcarrier
alternate between two phases every scan line. There are two possible alternation sequences and PALPHS bit
of M_CONTROL register selects one of the sequences.
f – Frequency – MHz
–60.00
–50.00
–40.00
–30.00
–20.00
–10.00
0.00
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
GAIN
vs
FREQUENCY
PAL_SQP
Gain
–
dB
NTSC_CCIR
PAL_CCIR
NTSC_SQP
Figure 7. Chroma Filter Frequency Response
closed caption encoding
TFP6422 and TFP6424 can be programmed to encode closed caption data and extended data in the selected
line. The closed caption data are sent to TFP6422 and TFP6424 through I2C. The data stream consists of
seven-bit US-ASCII code and one odd parity bit as shown in Figure 8.
Odd-Parity
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MSB
US-ASCII
LSB
Figure 8. Closed Caption Data Format
PRODUCT
PREVIEW
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