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參數(shù)資料
| 型號： | ADCDS-1403EX |
| 廠商： | CD TECHNOLOGIES INC |
| 元件分類： | ADC |
| 英文描述： | 14-Bit, 3 Megapixels/Second Imaging Signal Processor |
| 中文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, DIP40 |
| 封裝： | TDIP-40 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 198K |
| 代理商： | ADCDS-1403EX |
ADCDS -1403
5
Figure 6. Offset Adjustment vs. External Series Resistor
Offset Adjustment vs. External Series Resistor
10
100
1000
10000
0
5k
10k
15k
20k
25k
30k
35k
40k
45k
50k
55k
60k
External Series Resistor (Ohm's)
±
Figure 5. Fine Gain Adjustment Circuit
ADCDS-1403
Fine
Gain
Adjust
1
+5V
–
5V
20K
External Series Resistor Value (Ohms)
0.01
0.1
1
10
100
0
5K
10K 15K 20K 25K 30K 35K 40K 45K 50K 55K 60K
Offset Adjustment Sensitivity
External Series Resistor vs. Output Variation (LSB's)
O
Peak-Peak
variation at
potentiometer
1mV
10mV
100mV
Figure 7. Offset Adjustment Sensitivity
Offset Adjustment
Manual offset adjustment for the ADCDS-1403 can be
accomplished using the adjustment circuit shown in Figure
3. A software controlled D/A converter can be substituted for
the 20K
potentiometer. The offset adjustment feature
allows the user to adjust the Offset/Dark Current level of the
ADCDS-1403 until the output bits are 00 0000 0000 0000
and the LSB flickers between 0 and 1. Offset adjust should
be performed before gain adjust to avoid interaction. The
ADCDS-1403's offset adjustment is dependent on the value
of the external series resistor used in the offset adjust circuit
(Figure 3). The Offset Adjustment graph (Figure 6) illustrates
the typical relationship between the external series resistor
value and its offset adjustment capability utilizing ±5V
supplies.
Offset Adjustment Sensitivity
It should be noted that with increasing amounts of offset
adjustment (smaller values of external series resistors), the
ADCDS-1403 becomes more susceptible to power supply
noise or voltage variations seen at the wiper of the offset
potentiometer.
For Example:
External 50K resistor:
1.10mV of noise or voltage variation at the potentiometer
will produce 0.25LSB's of output variation.
2.100mV of noise or voltage variation at the potentiometer
will produce 2.5LSB's of output variation.
The Offset Adjustment Sensitivity graph (Figure 7) illustrates
the offset adjustment sensitivity over a wide range of external
resistor and noise values. If a large offset voltage is required,
it is recommended that a very low noise external reference
be used in the offset adjust circuit in place of power supplies.
The ADCDS-1403's +2.4V reference output could be
configured to provide the reference voltage for this type of
application.
Fine Gain Adjustment
Fine gain adjustment (pin 1) is provided to compensate for
the tolerance of the external coarse gain resistor (Rext) and/
or the unavailability of exact coarse gain resistor (Rext)
values. Note, the fine gain adjustment will not change the
expected input amplifier's full scale V
OUT
(2.8Vp-p.) Instead,
the gain of the ADCDS-1403's internal A/D is adjusted
allowing the actual input amplifier's full scale V
OUT
to
produce an output code of all ones (11 1111 1111 1111).
Fine gain adjustment for the ADCDS-1403 is accomplished
using the adjustment circuit shown below (Figure 5). A
software controlled D/A converter can be substituted for the
20K
potentiometer. The fine gain adjust circuit ensures that
the video input signal (saturated signal) will be properly
scaled to obtain the desired Full Scale digital output of 11
1111 1111 1111, with the LSB flickering between 0 and 1. Fine
gain adjust should be performed following the offset adjust
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADCDS-1405 | 制造商:Murata Power Solutions 功能描述:CCD Signal Processor 40-Pin TDIP |
| ADCDS-1405EX | 制造商:Murata Power Solutions 功能描述:CCD Signal Processor 40-Pin TDIP |
| ADCDS-1410 | 功能描述:多媒體雜項 0 to 70C TDIP 40pin 14Bit 10Mpixel RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube |
| ADCDS-1410EX | 制造商:MURATA-PS 制造商全稱:Murata Power Solutions Inc. 功能描述:14-Bit, 10 Megapixels/Second, CCD Signal Processor |
| ADCDS-1603 | 制造商:MURATA-PS 制造商全稱:Murata Power Solutions Inc. 功能描述:16-Bit, 2.3 Megapixels/Second CCD Signal Processor |
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