參數(shù)資料
型號(hào)： THS8134BCPHP
廠商： TEXAS INSTRUMENTS INC
元件分類： DAC
英文描述： PARALLEL, 8 BITS INPUT LOADING, 0.005 us SETTLING TIME, 8-BIT DAC, PQFP48
封裝： PLASTIC, HTQFP-48
文件頁(yè)數(shù)： 14/27頁(yè)
文件大小： 553K
代理商： THS8134BCPHP
THS8134, THS8134A, THS8134B
TRIPLE 8BIT, 80 MSPS VIDEO D/A CONVERTER
WITH TRILEVEL SYNC GENERATION
SLVS205D MAY 1999 REVISED MARCH 2000
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
APPLICATION INFORMATION
comparison to EIA RS-343/RS-170 levels
Traditionally, video amplitude levels are specified according to the EIA RS-343 or RS-170 standards. RS-343
uses a bi-level negative going sync. Also, there is a difference between the reference blanking and black video
level. Figure 15 shows the relative amplitudes and the current drives that would be needed to generate
compliant relative amplitudes with a double-terminated 75-
load, as is specified for RS-343. RS-170 compliant
levels can be reached using the same current sources but a different 150-
source termination resistor, which
brings the load to 150 || 75
= 50 . In this case a blank-to-white level of approximately 1 V is reached
(0.714 V
× 50 ÷ 37.5) as required by RS-170.
7.5 IRE
40 IRE
92.5 IRE
BLACK Level
BLANK Level
SYNC Level
With Sync Insertion
Without Sync Insertion
V
mA
V
mA
1.000
26.67
0.714
19.05
0.340
9.05
0.340
1.44
0.286
7.62
0
Figure 15. RS-343 Video Definition
The video signal contains 140 IRE, equal to 1 Vpp. This is split into 40 IRE for the composite sync, 7.5 IRE for
blanking-to-black and 92.5 IRE for the active video portion.
designing with PowerPAD
The THS8134 is housed in a high-performance, thermally enhanced, 48-pin PowerPAD package (TI package
designator: 48-PHP). Use of the PowerPAD package does not require any special considerations except to note
that the PowerPAD, which is an exposed die pad on the bottom of the device, is a metallic thermal and electrical
conductor. Therefore, if not implementing the PowerPAD PCB features, solder masks (or other assembly
techniques) may be required to prevent any inadvertent shorting by the exposed PowerPAD of connection
etches or vias under the package. The recommended option, however, is not to run any etches or signal vias
under the device, but to have only a grounded thermal land as explained below. Although the actual size of the
exposed die pad may vary, the minimum size required for the keep-out area for the 48-pin PHP PowerPAD
package is 7 mm
× 7 mm.
It is recommended that there be a thermal land, which is an area of solder-tinned-copper, underneath the
PowerPAD package. The thermal land will vary in size, depending on the PowerPAD package being used, the
PCB construction, and the amount of heat that needs to be removed. In addition, the thermal land may or may
not contain numerous thermal vias, depending on PCB construction.
More information on this package and other requirements for using thermal lands and thermal vias are detailed
in the TI application note PowerPAD
Thermally Enhanced Package Application Report, TI literature number
SLMA002, available via the TI Web pages beginning at URL: http://www.ti.com.
相關(guān)PDF資料
PDF描述
THS8134CPHP PARALLEL, 8 BITS INPUT LOADING, 0.005 us SETTLING TIME, 8-BIT DAC, PQFP48
THS8134ACPHP PARALLEL, 8 BITS INPUT LOADING, 0.005 us SETTLING TIME, 8-BIT DAC, PQFP48
THS8135-240IPHP PARALLEL, WORD INPUT LOADING, 10-BIT DAC, PQFP48
THS8135-80CPHP PARALLEL, WORD INPUT LOADING, 10-BIT DAC, PQFP48
THS8135-80IPHP PARALLEL, WORD INPUT LOADING, 10-BIT DAC, PQFP48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS8134BCPHP 制造商:Texas Instruments 功能描述:8BIT DAC 80MSPS TRIPLE SMD 8134
THS8134BCPHPG4 功能描述:數(shù)字化視頻/模擬轉(zhuǎn)換器集成電路 8-BIT 80MSPS TRIPLE DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:3 輸出類型:Current 轉(zhuǎn)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
THS8134BTQFP 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION
THS8134CPHP 制造商:Rochester Electronics LLC 功能描述:- Bulk
THS8134TQFP 制造商:TI 制造商全稱:Texas Instruments 功能描述:TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION
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