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參數(shù)資料
| 型號： | SPT7755AIK |
| 廠商： | SIGNAL PROCESSING TECHNOLOGIES |
| 元件分類： | ADC |
| 英文描述： | 1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQFP80 |
| 封裝： | MQUAD-80 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 92K |
| 代理商： | SPT7755AIK |
SPT
6
11/30/01
SPT7755
OPERATION
The SPT7755 has 256 preamp/comparator pairs which
are each supplied with the voltage from VRT to VRB divided
equally by the resistive ladder as shown in the block dia-
gram. This voltage is applied to the positive input of each
preamplifier/comparator pair. An analog input voltage ap-
plied at VIN is connected to the negative inputs of each
preamplifier/comparator pair. The comparators are then
clocked through each one’s individual clock buffer. When
the CLK pin is in the low state, the master or input stage of
the comparators compare the analog input voltage to the
respective reference voltage. When the CLK pin changes
from low to high the comparators are latched to the state
prior to the clock transition and output logic codes in se-
quence from the top comparators, closest to VRT (0 V),
down to the point where the magnitude of the input signal
changes sign (thermometer code). The output of each
comparator is then registered into four 64-to-6 bit decod-
ers when the CLK is changed from high to low. At the out-
put of the decoders is a set of four 7-bit latches which are
enabled (“track”) when the clock changes from high to low.
From here, the output of the latches are coded into 6 LSBs
from 4 columns and 4 columns are coded into 2 MSBs.
Finally, 8 ECL output latches and buffers are used to drive
the external loads. The conversion takes one clock cycle
from the input to the data outputs.
Figure 2 – Timing Diagram
VIN
CLK
DRA
DRB
Data Bank B
N-1
N+1
N+3
N
N+1
N+2
N+3
N+4
N+5
N+6
N-2
N
N+2
N+4
1.75 ns
typ
1.4 ns
typ
Data Bank A
2.0 ns
1.75 ns
typ
1.4 ns
typ
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPT7755BIK | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:8-BIT, 750 MSPS, FLASH A/D CONVERTER |
| SPT7760 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT, 1 GSPS FLASH A/D CONVERTER |
| SPT7760AIK | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT, 1 GSPS FLASH A/D CONVERTER |
| SPT7760BIK | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT, 1 GSPS FLASH A/D CONVERTER |
| SPT7810 | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:10-BIT, 20 MSPS, ECL OUTPUT A/D CONVERTER |
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