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CDK1303AEMQ80 датащи(PDF) 8 Page - Cadeka Microcircuits LLC.

номер детали CDK1303AEMQ80
подробное описание детали  8-bit, 1 GSPS, Flash A/D Converter
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производитель  CADEKA [Cadeka Microcircuits LLC.]
домашняя страница  http://www.cadeka.com
Logo CADEKA - Cadeka Microcircuits LLC.

CDK1303AEMQ80 датащи(HTML) 8 Page - Cadeka Microcircuits LLC.

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©2008 CADEKA Microcircuits LLC
www.cadeka.com
8
Data Sheet
Operation
The CDK1303 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
diagram. This voltage is applied to the positive input of
each preamplifier/comparator pair. An analog input volt-
age applied 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 volt-
age 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 sequence from the top comparators, closest to
VRT (0V), 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 decoders when the CLK is changed from high to low.
At the output 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
CLK
DRA
DRA
DRB
DRB
Data Bank B
N-1
N+1
N+3
N
N+1
N+2
N+3
N+4
N+5
N+6
N+7
N-2
N
N+2
N+4
Data Bank A
1.4 ns typ
1.4 ns typ
1.75 ns typ
1.0 ns
1.75 ns typ


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