TDC1044AR4C FAIRCHILD [Fairchild Semiconductor], TDC1044AR4C Datasheet

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TDC1044AR4C

Manufacturer Part Number
TDC1044AR4C
Description
Monolithic Video A/D Converter 4-Bit, 25 Msps
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
Features
• 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
Applications
• Digital communications
• Video special effects
• Radar data conversion
• Medical imaging
Block Diagram
TDC1044A
Monolithic Video A/D Converter
4-Bit, 25 Msps
NMINV
NLINV
CONV
V
R
R
R
IN
M
B
T
REFERENCE
RESISTOR
CHAIN
R/2
R
R
R
R
R
R
R
1
DIFFERENTIAL
COMPARATORS
(15)
1
2
8
14
15
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’s complement
codes.
DECODER
15 TO 4
LATCH
www.fairchildsemi.com
65-1044A-01
4
D
1
Rev. 1.1.2
–D
4

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TDC1044AR4C Summary of contents

Page 1

TDC1044A Monolithic Video A/D Converter 4-Bit, 25 Msps Features • 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 Applications • Digital ...

Page 2

TDC1044A 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. All the comparators ...

Page 3

PRODUCT SPECIFICATION 1 Table 1. Output Coding Range True -1.00V FS NMINV = 1 NLINV = 1 0.000V 0000 -0.067V 0001 -0.133V 0010 -0.200V 0011 -0.267V 0100 -0.333V 0101 -0.400V 0110 -0.467V 0111 -0.533V 1000 -0.600V 1001 -0.667V 1010 -0.733V ...

Page 4

TDC1044A Pin Descriptions Pin Number Pin Name DIP Power GND A 1 GND Reference Control NMINV 9 NLINV 7 Convert CONV 16 Analog ...

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PRODUCT SPECIFICATION Absolute Maximum Ratings (beyond which the device may be damaged) Type Parameter Supply Voltages V (measured (measured (measured to D GND Input Voltages CONV, NMINV, NLINV (measured ...

Page 6

TDC1044A Electrical Characteristics Within specified operating conditions Parameter I Positive Supply Current CC I Negative Supply Current EE I Reference Current REF R Total Reference Resistance REF R Input Equivalent Resistance IN C Input Capacitance IN I Input Constant Bias ...

Page 7

PRODUCT SPECIFICATION System Performance Characteristics Within specified operating conditions Parameter E Linearity Error Integral Independent LI E Linearity Error Differential LD CS Code Size E Offset Error Top OT E Offset Error Bottom OB T Offset Error Temperature Coefficient CO ...

Page 8

TDC1044A Equivalent Circuits V IN REFERENCE RESISTOR V EE CHAIN Figure 1. Simplified Analog Input Equivalent Circuit V CC 20K INPUT 65-1044A-06 Figure 2. Digital Input Equivalent Circuit 1-OF-15 COMPARATORS V EE 10K PRODUCT SPECIFICATION C IN ...

Page 9

PRODUCT SPECIFICATION Applications Discussion Calibration To calibrate the TDC1044A, adjust V RT 1st and 15th thresholds to the desired voltages. Assuming -1V desired range, continuously strobe the converter with -0.0033V (1/2 LSB from 0.000V) on the analog ...

Page 10

TDC1044A +5V R1 37.4 VIDEO INPUT 1Vp LM313 24V 10-TURN 2K "GAIN" 10-TURN C7 "OFFSET" 0.1 50V CLK –5. FERRITE BEAD 220 INDUCTOR C12 1–6pF ...

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PRODUCT SPECIFICATION Notes: TDC1044A 11 ...

Page 12

TDC1044A Notes: 12 PRODUCT SPECIFICATION ...

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PRODUCT SPECIFICATION Mechanical Dimensions 16-Lead Ceramic DIP Package Inches Millimeters Symbol Min. Max. Min. Max. A — .200 — 5.08 b1 .014 .023 .36 b2 .050 1.27 .065 1.65 c1 .008 .015 .20 D .745 .840 18.92 21.33 E .220 ...

Page 14

TDC1044A Mechanical Dimensions 16-Lead Plastic DIP Package Inches Millimeters Symbol Min. Max. Min. A — .210 — A1 .015 — .38 A2 .115 .195 2.93 B .014 .022 .36 B1 .045 .070 1.14 C .008 .015 .20 D .745 .840 ...

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PRODUCT SPECIFICATION Mechanical Dimensions 20-Lead PLCC Package Inches Millimeters Symbol Min. Max. Min. Max. A .165 .180 4.19 4.57 A1 .090 .120 2.29 3.05 A2 .020 — .51 B .013 .021 .33 B1 .026 .032 .66 D/E .385 .395 9.78 ...

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... Temperature Range TDC1044AB9C 0°C to 70°C TDC1044AN9C 0°C to 70°C TDC1044AR4C 0°C to 70°C LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1 ...

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