ADC1061 National Semiconductor, ADC1061 Datasheet

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ADC1061

Manufacturer Part Number
ADC1061
Description
10-Bit High-Speed P-Compatible A/D Converter with Track/Hold Function
Manufacturer
National Semiconductor
Datasheet

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© 1999 National Semiconductor Corporation
ADC1061
10-Bit High-Speed µP-Compatible A/D Converter with
Track/Hold Function
General Description
Using a modified half-flash conversion technique, the 10-bit
ADC1061 CMOS analog-to-digital converter offers very fast
conversion times yet dissipates a maximum of only 235 mW.
The ADC1061 performs a 10-bit conversion in two
lower-resolution “flashes”, thus yielding a fast A/D without
the cost, power dissipation, and other problems associated
with true flash approaches.
The analog input voltage to the ADC1061 is tracked and held
by an internal sampling circuit. Input signals at frequencies
from DC to greater than 160 kHz can therefore be digitized
accurately without the need for an external sample-and-hold
circuit.
For ease of interface to microprocessors, the ADC1061 has
been designed to appear as a memory location or I/O port
without the need for external interface logic.
Simplified Block and Connection Diagrams
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
DS010559
Features
n 1.8 µs maximum conversion time to 10 bits
n Low power dissipation: 235 mW (maximum)
n Built-in track-and-hold
n No external clock required
n Single +5V supply
n No missing codes over temperature
Applications
n Waveform digitizers
n Disk drives
n Digital signal processor front ends
n Mobile telecommunications
DS010559-2
www.national.com
June 1999

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ADC1061 Summary of contents

Page 1

... A/D without the cost, power dissipation, and other problems associated with true flash approaches. The analog input voltage to the ADC1061 is tracked and held by an internal sampling circuit. Input signals at frequencies from DC to greater than 160 kHz can therefore be digitized accurately without the need for an external sample-and-hold circuit ...

Page 2

... RD (4) This is the active low Read control input. When this pin is low, any data present in the ADC1061’s output registers will be placed on the data bus. In Mode 2, the Read signal must be low until INT goes low. Until INT goes low, the data at the output pins will be incorrect ...

Page 3

... Infrared (15 seconds) Junction Temperature, T −0.3V to +6V Storage Temperature Range + −0. +0. Operating Ratings 20 mA 875 mW Temperature Range 1500V ADC1061CIN, ADC1061CIWM Supply Voltage Range 260˚C = 5V, and V = GND unless otherwise specified. Boldface lim- REF(+) REF(− 25˚ Conditions Typical (Note 7) ± ...

Page 4

AC Electrical Characteristics + The following specifications apply for Boldface limits apply for MIN Symbol Parameter t Conversion Time from Rising Edge CONV Falling Edge of INT t ...

Page 5

TRI-STATE Test Circuits and Waveforms DS010559-5 Timing Diagrams FIGURE 1. Mode 1. The conversion time (t FIGURE 2. Mode 2 (RD Mode). The conversion time (t the sampling time, and is determined by the internal timer. (Continued) DS010559-6 DS010559-7 ) ...

Page 6

... Reference Voltage Mode 1 Conversion Time vs Temperature Functional Description The ADC1061 digitizes an analog input signal to 10 bits ac- curacy by performing two lower-resolution “flash” conver- sions. The first flash conversion provides the six most signifi- cant bits (MSBs) of data, and the second flash conversion provides the four least significant bits (LSBs) ...

Page 7

... In Mode 2, also called “RD mode”, the S /H and RD pins are tied together. A conversion is initiated by pulling both pins low. The ADC1061 samples the input voltage and causes the coarse comparators to become active. An internal timer then terminates the coarse conversion and begins the fine con- version. About 1.8 µ ...

Page 8

... ADC1061. 4.0 Inherent Sample-and-Hold Because the ADC1061 samples the input signal once during each conversion capable of measuring relatively fast in- put signals without the help of an external sample-hold conventional successive-approximation A/D converter, re- ...

Page 9

... CC CC these voltage limits are exceeded, the overdrive current into or out of any pin on the ADC1061 must be limited to less than 5 mA, and no more than overdrive current (all overdriven pins combined) should flow. In systems with mul- tiple power supplies, this may require careful attention to power supply sequencing. The ADC1061’ ...

Page 10

... Physical Dimensions inches (millimeters) unless otherwise noted www.national.com Order Number ADC1061CIWM NS Package Number M20B Order Number ADC1061CIN NS Package Number N20A 10 ...

Page 11

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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