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參數資料
| 型號： | THS8135PHP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.015 us SETTLING TIME, 10-BIT DAC, PQFP48 |
| 封裝： | GREEN, PLASTIC, HTQFP-48 |
| 文件頁數： | 25/25頁 |
| 文件大小： | 522K |
| 代理商： | THS8135PHP |
THS8135
TRIPLE 10BIT, 240 MSPS VIDEO DAC WITH TRILEVEL SYNC AND VIDEO
(ITUR.BT601)COMPLIANT FULL SCALE RANGE
SLAS343A MAY 2001 REVISED JUNE 2002
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
selection of full or reduced-scale ITU.BT601 modes (available in video DAC mode only) (continued)
When using reduced-scale range, the output sync:video amplitude ratio is still 7:3, but now takes into account
the reduced code range, not the full-scale range, to determine this ratio. Therefore, proper sync amplitudes are
preserved in either mode, when the full-scale current is modified as explained higher. When changing DAC
full-scale current using RFS, the sync amplitude level always scales proportionally with the video output
compliance.
Note that even when using reduced-scale range, the midscale blanking level on ABPb and ARPr channels still
corresponds to code 512 = [64+(960-64)/2] when using YCbCr color space configuration. Table 6 shows the
valid reduced input code ranges for RGB and YCbCr operation on each of the input data buses. While the
THS8135 allows reduced-scale code range with RGB data, video systems normally use it only with YCbCr type
data.
Table 6. Input Code Ranges for ITU.BT601 Modes
OPERATING MODE
GY[ ]
RPr[ ]
BPb[ ]
RGB
64940
YCbCr
64940
64960
DAC operation
The analog output drivers generate a current of which the drive level can be user-modified by choosing an
appropriate resistor value RFS, connected to the FSADJ pin.
All current source amplitudes (video, blanking, and sync) are derived from an internal voltage reference such
that the relative amplitudes of sync, blank, and video are always equal to their nominal relationships.
Figure 1 through Figure 4 show the nominal output voltage levels for full- or reduced-range input code range
configurations on R, G, B, and Y versus Cb and Cr channels.
Note that in full-scale input code range configuration, the blanking level is at 350 mV on all outputs; while in
reduced-scale operation it is at 400 mV on all outputs.
In reduced scale modes, after proper adjustment of RFS, the nominal 700-mV output compliance is reached from
an input code range of only 876 (=940-64) codes on G/Y, and of only 896 (=960-64) codes on R/Pr and B/Pr
output channels. The maximum excursions are ~817mV (= 1023/876 x 700 mV) on G/Y and ~800 mV (=
876/896 x 817 mV) on B/Pb and R/Pr channels. Figure 4 shows that when using reduced-scale input code
range, the blanking level needs to be at 400 mV to accommodate the maximum negative excursion on B/Pr and
R/Pr channels.
The figures also show the excursions for the sync level positions in either full-scale or reduced-scale
configurations. These levels are internally adjusted and assure 300-mV sync excursions when using nominal
termination loads and properly adjusting RFS, as explained before.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS8135PHP | 制造商:Texas Instruments 功能描述:10BIT DAC 240MSPS TRIPLE SMD |
| THS8135PHPG4 | 功能描述:數字化視頻/模擬轉換器集成電路 Tr 10B 240MSPS Video DAC RoHS:否 制造商:Texas Instruments 轉換器數量:3 輸出類型:Current 轉換速率:180 MSPs 分辨率:10 bit 接口類型:Parallel 電壓參考:Internal or External 積分非線性:- 2.5 LSB, 1.5 LSB 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:HTQFP 封裝:Tray |
| THS8136 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 10-BIT 180-MSPS GRAPHICS AND VIDEO DAC |
| THS8136IPHP | 功能描述:數字化視頻/模擬轉換器集成電路 Triple 10B 180MSPS Graphics & Video DAC RoHS:否 制造商:Texas Instruments 轉換器數量:3 輸出類型:Current 轉換速率:180 MSPs 分辨率:10 bit 接口類型:Parallel 電壓參考:Internal or External 積分非線性:- 2.5 LSB, 1.5 LSB 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:HTQFP 封裝:Tray |
| THS8136IPHPR | 功能描述:數字化視頻/模擬轉換器集成電路 Triple 10B 180MSPS Graphics & Video DAC RoHS:否 制造商:Texas Instruments 轉換器數量:3 輸出類型:Current 轉換速率:180 MSPs 分辨率:10 bit 接口類型:Parallel 電壓參考:Internal or External 積分非線性:- 2.5 LSB, 1.5 LSB 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:HTQFP 封裝:Tray |
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