adc0808cj Microsemi Corporation, adc0808cj Datasheet

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adc0808cj

Manufacturer Part Number
adc0808cj
Description
8-bit Compatible Converters With 8-channel Multiplexer
Manufacturer
Microsemi Corporation
Datasheet

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© 1999 National Semiconductor Corporation
ADC0808/ADC0809
8-Bit µP Compatible A/D Converters with 8-Channel
Multiplexer
General Description
The ADC0808, ADC0809 data acquisition component is a
monolithic CMOS device with an 8-bit analog-to-digital con-
verter, 8-channel multiplexer and microprocessor compatible
control logic. The 8-bit A/D converter uses successive ap-
proximation as the conversion technique. The converter fea-
tures a high impedance chopper stabilized comparator, a
256R voltage divider with analog switch tree and a succes-
sive approximation register. The 8-channel multiplexer can
directly access any of 8-single-ended analog signals.
The device eliminates the need for external zero and
full-scale adjustments. Easy interfacing to microprocessors
is provided by the latched and decoded multiplexer address
inputs and latched TTL TRI-STATE
The design of the ADC0808, ADC0809 has been optimized
by incorporating the most desirable aspects of several A/D
conversion techniques. The ADC0808, ADC0809 offers high
speed, high accuracy, minimal temperature dependence, ex-
cellent long-term accuracy and repeatability, and consumes
minimal power. These features make this device ideally
suited to applications from process and machine control to
consumer and automotive applications. For 16-channel mul-
tiplexer with common output (sample/hold port) see
ADC0816 data sheet. (See AN-247 for more information.)
Block Diagram
TRI-STATE
®
is a registered trademark of National Semiconductor Corp.
®
outputs.
DS005672
See Ordering
Information
Features
n Easy interface to all microprocessors
n Operates ratiometrically or with 5 V
n No zero or full-scale adjust required
n 8-channel multiplexer with address logic
n 0V to 5V input range with single 5V power supply
n Outputs meet TTL voltage level specifications
n Standard hermetic or molded 28-pin DIP package
n 28-pin molded chip carrier package
n ADC0808 equivalent to MM74C949
n ADC0809 equivalent to MM74C949-1
Key Specifications
n Resolution
n Total Unadjusted Error
n Single Supply
n Low Power
n Conversion Time
adjusted voltage reference
DS005672-1
DC
±
1
2
or analog span
LSB and
October 1999
www.national.com
±
15 mW
100 µs
1 LSB
5 V
8 Bits
DC

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adc0808cj Summary of contents

Page 1

ADC0808/ADC0809 8-Bit µP Compatible A/D Converters with 8-Channel Multiplexer General Description The ADC0808, ADC0809 data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital con- verter, 8-channel multiplexer and microprocessor compatible control logic. The 8-bit A/D converter uses ...

Page 2

... Package Outline N28A Molded DIP www.national.com Molded Chip Carrier Package Order Number ADC0808CCV or ADC0809CCV DS005672-11 −40˚C to +85˚C ADC0808CCV ADC0809CCV V28A Molded Chip Carrier 2 DS005672-12 See NS Package V28A −55˚C to +125˚C ADC0808CCJ ADC0808CJ J28A Ceramic DIP J28A Ceramic DIP ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V ) (Note 3) CC Voltage at Any Pin −0. Except Control Inputs Voltage at ...

Page 4

Electrical Characteristics Digital Levels and DC Specifications: ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75 V −40˚C T +85˚C unless otherwise noted A Symbol Parameter DATA OUTPUTS AND EOC (INTERRUPT) V Logical “1” Output Voltage OUT(1) V Logical “0” Output Voltage OUT(0) ...

Page 5

Functional Description Multiplexer. The device contains an 8-channel single-ended analog signal multiplexer. A particular input channel is se- lected by using the address decoder. Table 1 shows the input states for the address lines to select any channel. The ad- ...

Page 6

Functional Description FIGURE 2. 3-Bit A/D Transfer Curve www.national.com (Continued) FIGURE 1. Resistor Ladder and Switch Tree DS005672-13 FIGURE 3. 3-Bit A/D Absolute Accuracy Curve FIGURE 4. Typical Error Curve 6 DS005672-2 DS005672-14 DS005672-15 ...

Page 7

Timing Diagram FIGURE 5. 7 DS005672-4 www.national.com ...

Page 8

Typical Performance Characteristics DS005672-16 FIGURE 6. Comparator 5V REF TRI-STATE Test Circuits and Timing Diagrams DS005672- DS005672-21 Applications Information OPERATION 1.0 RATIOMETRIC CONVERSION ...

Page 9

Applications Information (Continued) tem reference must be used which relates the full-scale volt- age to the standard volt. For example then the full-scale range is divided into 256 standard steps. The smallest standard step is 1 LSB ...

Page 10

Applications Information FIGURE 11. Ground Referenced Conversion System with www.national.com (Continued) FIGURE 10. Ground Referenced Conversion System Using Trimmed Supply Reference Generating V Supply CC 10 DS005672-24 DS005672-25 ...

Page 11

Applications Information (Continued) FIGURE 12. Typical Reference and Supply Circuit = Ratiometric transducers FIGURE 13. Symmetrically Centered Reference 3.0 CONVERTER EQUATIONS The transition between adjacent codes N and N+1 is given by: The center of ...

Page 12

Applications Information 4.0 ANALOG COMPARATOR INPUTS The dynamic comparator input current is caused by the pe- riodic switching of on-chip stray capacitances. These are connected alternately to the output of the resistor ladder/ switch tree network and to the comparator ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted Order Number ADC0808CCN or ADC0809CCN Order Number ADC0808CCV or ADC0809CCV Molded Dual-In-Line Package (N) NS Package Number N28B Molded Chip Carrier (V) NS Package Number V28A 13 www.national.com ...

Page 14

LIFE SUPPORT POLICY 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 ...

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