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參數(shù)資料
| 型號： | ADCDS-1403 |
| 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)： | 6/9頁 |
| 文件大?。?/td> | 198K |
| 代理商： | ADCDS-1403 |
ADCDS -1403
6
Table 1. Out-of-Range Conditions
Table 2. Output Coding
OUT
OVER
RANGE
UNDER
RANGE
INPUT
SIGNAL
OF RANGE
MSB
0
0
1
1
0
1
0
1
0
0
0
1
0
0
1
0
In Range
In Range
Underrrange
Overrange
Notes:
Input Amplifier V
OUT
= (Video Signal - Reference Level)
The video portion of the differential signal (input-amplifier's V
OUT
) must be more negative than its associated reference
level and V
OUT
should not exceed ±2.8V DC.
Video Signal-Reference Signal
>
–
2.80000
–
2.80000
–
2.10000
–
1.40000
–
0.70000
–
0.35000
–
0.000171
0
<0
>Full Scale
–
1LSB
Full Scale
–
1LSB
3/4FS
1/2FS
1/4FS
1/8FS
1 LSB
0
<0
11 1111 1111 1111
11 1111 1111 1111
11 0000 0000 0000
10 0000 0000 0000
01 0000 0000 0000
00 1000 0000 0000
00 0000 0000 0001
00 0000 0000 0000
00 0000 0000 0000
1
0
0
0
0
0
0
0
1
Video Signal-Reference Signal
INPUT AMPLIFIER V
OUT
,
à
(VOLTS P-P)
SCALE
DIGITAL OUTPUT OUT-OF-RANGE
Output Coding
The ADCDS-1403's output coding is Straight Binary as
indicated in Table 2. The table shows the relationship between
the output data coding and the difference between the
reference signal voltage and its corresponding video signal
voltage. (These voltages are referred to the output of the
ADCDS-1403's input amplifier's V
OUT
).
Programmable Analog Bandwidth Function
When interfacing to CCD arrays with very high-speed "read-
out" rates, the ADCDS-1403's input stage must have sufficient
analog bandwidth to accurately reproduce the output signals
of the CCD array. The amount of analog bandwidth
determines how quickly and accurately the "Reference Hold"
and the "CDS output" signals will settle. If only a single analog
bandwidth was offered, the ADCDS-1403's bandwidth would
be set to acquire and digitize CCD output signals to 14-bit
accuracy, at maximum conversion rate of 3MHz (333ns see
Figure 11. for details). Applications not requiring the maximum
conversion rate would be forced to use the full analog
bandwidth at the possible expense of noise performance.
The ADCDS-1403 avoids this situation by offering a fully
programmable analog bandwidth function. The ADCDS-1403
allows the user to "bandwidth limit" the input stage in order to
realize the highest level of noise performance for the
application being considered. Table 3. describes how to
select the appropriate reference hold "aquisition time" and
CDS output "settling time" needed for a particular application.
Each of the selections listed in Table 3. have been optimized
to provide only enough analog bandwidth to acquire a full
scale input step, to 14-bit accuracy, in a single conversion.
Increasing the analog bandwidth (using a faster settling and
acquisition time) would only serve to potentially increase the
amount of noise at the ADCDS-1403's output. The ADCDS-
1403 uses a two bit digital word to select four different analog
bandwidths for the ADCDS-1403's input stage (See Table 3.
for details).
MSB
OUT-OF-RANGE
"OVERRANGE"
"UNDERRANGE"
Figure 8. Overrange/ Underrange Circuit
to avoid interaction. The fine gain adjust provides ±256 codes
of adjust when ±5V supplies are used for the Fine Gain Adjust
Circuit.
Out-of-Range Indicator
The ADCDS-1403 provides a digital Out-of-Range output
signal (pin 24) for situations when the video input signal
(saturated signal) is beyond the input range of the internal A/D
converter. The digital output bits and the Out-of-Range signal
correspond to a particular sampled video input voltage, with
both of these signals having a common pipeline delay.
Using the circuit described in Figure 8., both overrange and
underrange conditions can be detected (see Table 1). When
combined with a D/A converter, digital detection and orrection
can be performed for both the gain and offset errors.
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADCDS-1403EX | 制造商:Murata Power Solutions 功能描述:Video Proc 12V/5V/-5V 0.016A/0.046A/-0.035A 40-Pin TDIP |
| 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 |
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| 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 |
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