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4-bit resolution
1/4 LSB non-linearity
Sample-and-hold circuit not required
25 Msps conversion rate
Selectable output format
16-lead DIP and 20-lead PLCC packages
Description
The TDC1044A is a 25 Msps (Megasample per second) full-
parallel analog-to-digital converter, capable of converting an
analog signal with full-power frequency components up to
12.5 MHz into 4-bit digital words. Use of a sample-and-hold
circuit is not necessary for operation of the TDC1044A. All
digital inputs and outputs are TTL compatible.
The TDC1044A consists of 15 latching comparators, encod-
ing logic, and an output register. A single convert signal
controls the conversion operation. Output formats are
true/inverted binary or true/inverted offset two鈥檚 complement
codes.
Applications
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Digital communications
Video special effects
Radar data conversion
Medical imaging
Block Diagram
NMINV
NLINV
CONV
V
IN
R
T
R
1
R
2
R
1
R
R
M
R
8
15 TO 4
DECODER
LATCH
4
D
1
鈥揇
4
R
14
65-1044A-01
R
15
R/2
R
B
REFERENCE
RESISTOR
CHAIN
DIFFERENTIAL
COMPARATORS
(15)
Rev. 1.1.2
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