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參數資料
| 型號： | THS8083APZP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | GREEN, PLASTIC, HTQFP-100 |
| 文件頁數： | 49/63頁 |
| 文件大小： | 320K |
| 代理商： | THS8083APZP |
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A1
Appendix A
PLL Formulas and Register Settings
If:
F(XTL) = frequency of external crystal or master clock connected to XTL1 input of THS8083A
F(VCO) = frequency of THS8083Ainternal VCO
F(DTO) = frequency of THS8083Ainternal DTO
F(DTOCLK) = frequency of externally available DTO clock output
F(HS) = frequency of HS input
CLKDIV = clock output divider setting
VCODIV = feedback divider in THS8083Ainternal analog PLL loop
TERMCNT = feedback divider in THS8083Ainternal digital PLL loop
DTO_INC = DTO increment (when NOM_INC is programmed, DTO_INC is initialized to NOM_INC)
Then:
F(VCO) = F(XTL) x VCODIV
F(DTO) = 32 x F(VCO) / DTO_INC
F(DTOCLK) = F(DTO) / CLKDIV
And, if PLL is locked:
F(DTOCLK) = TERMCNT * F(HS)
Summarizing:
DTO_INC = [32xF(XTL)xVCODIV] / [F(DTOCLK)xCLKDIV]
The formats of DTO_INC and NOM_INC:
Both are 33-bit values consisting of a 6-bit integer and a 27-bit fractional part. So, in hexadecimal notation,
the value is between 00.0000000hex and 3F.7FFFFFFhex. The decimal value of the increment is: <integer
part>.<fractional part interpreted as integer value>x2^(27). This means, to arrive at the decimal value of
the increment:
1.
Interpret the 6 MSBs as an integer value
2.
Interpret the 27 LSBs expressed as a decimal integer value and multiply this by 2^(27) to arrive at a
fractional value
3.
Add 1 and 2.
Additional restrictions:
NOM_INC must be within the range [16,32]. During an unlocked condition of the PLL (e.g., during video
format changes), the user needs to take care that the instantaneous DTO increment does not go outside
this valid range. This can be achieved by monitoring the SYNC_DETECT register bit (for no video input)
and the LOCK pin (for unlock) and disabling the PFD (DISABLE_PFD register bit) when no video input or
unlock is detected. This will keep the DTO operting at the nominal frequency. This update must be done
within a few PFD updates (i.e., within a few video line periods) to avoid the DTO from drifting outside its
valid range. When drifting outside this range, the DTO output might become unstable or absent. Since the
I2C interface requires a valid DTO clock, I2C communication errors will occur (no I2C ACK) when a stable
DTO clock is lost. When this happens, a hardware reset (/RESET pin) will be needed to recover.
CLKDIV must be chosen for different output clock frequency ranges as shown in register map description
for SEL_CLK.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS8083APZP | 制造商:Texas Instruments 功能描述:8BIT ADC 80MSPS TRIPLE SMD 8083 |
| THS8083APZPG4 | 功能描述:視頻模擬/數字化轉換器集成電路 Tr 8B 95MSPS 3.3V Vid & Graphics Dig RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉換器數量:1 ADC 輸入端數量:4 轉換速率:3 Gbps 分辨率:8 bit 結構: 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| THS8083CPZP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| THS8083EVM | 制造商:Texas Instruments 功能描述:THS8083EVM - Bulk |
| THS8083T | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Triple 8-Bit, 80 MSPS, 3.3-V Video and Graphics Digitizer With Digital PLL |
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