Fairchild Semiconductor TDC1044AN9C
The TDC1044A is a 25 Msps (Megasample per second) fullparallel 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. The TDC1044A consists of 15 latching comparators, encoding logic, and an output register.FEATURES
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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
Use of a sample-and-hold circuit is not necessary for operation of the TDC1044A. All digital inputs and outputs are TTL compatible. A single convert signal controls the conversion operation. Output formats are true/inverted binary or true/inverted offset two’s complement codes.APPLICATIONS
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● Digital communications Video special effects Radar data conversion Medical imaging Block Diagram NMINV NLINV CONV VIN RT R1 R 2 R 1 R RM R 8 15 TO 4 DECODER LATCH 4 D1–D4 R 14 65-1044A-01 R 15 R/2 RB REFERENCE RESISTOR CHAIN DIFFERENTIAL COMPARATORS (15) Rev. 1.1.2 TDC1044A PRODUCT SPECIFICATION Functional
DESCRIPTION
General Information The TDC1044A has three functional sections: a comparator array, encoding logic, and an output register. The comparator array compares the input signal with 15 reference voltages to produce an N-of-15 thermometer code.