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| 型号： | DAC1391X |
| 英文描述： | DAC1391X 2.5V 12BIT 80MSPS DAC|Data Sheet |
| 中文描述： | DAC1391X 2.5V的12位80Msps的发展援助委员会|数据资料 |
| 文件页数： | 14/15页 |
| 文件大小： | 228K |
| 代理商： | DAC1391X |
SEC ASIC
DAC1350X
10BIT 75MSPS Quad DAC
ANALOG
<figure 2>
If a standard doubly terminated 75 Ohm line is
assumed :
V100
1
I100 = -------- = --------- = 26.666mA
RLOAD
37.5
The relationship between the IR reference current
and DAC output current is shown below.
IR = 32 LSB
From the previous equation we have:
IRSET
0.7V
RSET = --------- = ------------- = 654
IR
1.069mA
Summation of all equations gives :
IRSET * C100 * RLOAD
RSET = ------------------------------
32 * V100
For most video applications an external resistor
of 649
(+/ 1%) would be selected when
driving doubly terminated loads (37.5
), and
an external resistor of 1.3K
(+/ 1%) would
be selected when driving loads of 75
, in
order to have 798 DAC codes correspond to a
1V delta output voltage swing. Then the DAC
output levels and the associated codes are as
shown below.
Table 1:Summary of DAC Voltage and Codes
Signal Level
CVBS/LUMA
DAC Code
IRE Value
DAC Voltage
Max output
1023
137.2
1.282V
100% White
810
100
1.015V
Black
282
7.37
353mV
Sync
12
-40
15mV
White - Black
570
100
714mV delta
White - Sync
798
140
1V delta
Color burst
228
40
285mV delta
DAC voltages assume the standard 140 IRE =
1V. Numbers shown are for NTSC type video
with a pedestal.
Reference
Generator
CCOMP
IREF
Current for
1 LSB
External
resistor
I
R
8 / 15
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