adc1061cin National Semiconductor Corporation, adc1061cin Datasheet

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adc1061cin

Manufacturer Part Number
adc1061cin
Description
10-bit High-speed ?p-compatible A/d Converter With Track/hold Function
Manufacturer
National Semiconductor Corporation
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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adc1061cin Summary of contents

Page 1

... I/O port without the need for external interface logic. Simplified Block and Connection Diagrams TRI-STATE ® registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS010559 Features n 1.8 µs maximum conversion time to 10 bits n Low power dissipation: 235 mW (maximum) ...

Page 2

... This is the power supply ground pin. The ground pin should be connected to a “clean” ground reference point. DB0–DB9 These are the TRI-STATE output pins. (11-20) www.national.com (Continued) Dual-In-Line Package DS010559-1 Top View Order Number ADC1061CIN or ADC1061CIWM See NS Package J20A, M20B or N20A T 85˚C) Package A N20A M20B Function must be greater than V ...

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

Typical Performance Characteristics Zero (Offset) Error vs 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 ...

Page 7

Functional Description (Continued) FIGURE 3. Block Diagram of the Modified Half-Flash Converter Architecture The remaining four LSBs may now be determined using the same sixteen comparators that were used for the first flash conversion. The MSB Ladder tap voltage just ...

Page 8

Modes of Operation FIGURE 4. Typical connection. Note the multiple bypass capacitors on the reference and power supply pins ground using multiple capacitors (see 5.0 “Power Supply Considerations”). 2.0 Reference Considerations The ADC1061 has two reference inputs. ...

Page 9

Inherent Sample-and-Hold (Continued) The ADC1061 can perform accurate conversions of input signals at frequencies from DC to greater than 160 kHz with- out the need for external sampling circuitry. 5.0 Power Supply Considerations The ADC1061 is designed to operate ...

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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