ADC0838CCN/NOPB

... NSC MICROWIRE compatible — direct interface to COPS family processors n Easy interface to all microprocessors, or operates “stand-alone” Typical Application TRI-STATE ® registered trademark of National Semiconductor Corporation. COPS ™ and MICROWIRE ™ are trademarks of National Semiconductor Corporation. © 2002 National Semiconductor Corporation n Operates ratiometrically or with 5 V ...

Connection Diagrams ADC0838 8-Channel Mux Small Outline/Dual-In-Line Package (WM and N) Top View ADC0834 4-Channel MUX Small Outline/Dual-In-Line Package (WM and N) COM internally connected to A GND Top View Top View ADC0832 2-Channel MUX Dual-In-Line Package (N) COM internally ...

Ordering Information Part Number Analog Input Channels ADC0831CCN 1 ADC0831CCWM ADC0832CIWM 2 ADC0832CCN ADC0832CCWM ADC0834BCN 4 ADC0834CCN ADC0834CCWM ADC0838BCV 8 ADC0838CCV ADC0838CCN ADC0838CIWM ADC0838CCWM See NS Package Number M14B, M20B, N08E, N14A, N20A or V20A Total Package Unadjusted Error ± ...

... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. + Current into V (Note 3) Supply Voltage, V (Note 3) CC Voltage Logic Inputs Analog Inputs Input Current per Pin (Note 4) Package Storage Temperature ...

Converter and Multiplexer Electrical Characteristics ≤ 5V REF REF CC apply from (Continued) MIN MAX Conditions Parameter CONVERTER AND MULTIPLEXER CHARACTERISTICS Power Supply Sensitivity ...

AC Characteristics The following specifications apply for V Parameter f , Clock Frequency Min CLK Max t , Conversion Time C Clock Duty Cycle Min (Note 10) Max Falling Edge or SET-UP Data Input Valid to CLK ...

Typical Performance Characteristics Unadjusted Offset Error vs. V Linearity Error vs. Temperature Power Supply Current vs. Temperature (ADC0838, ADC0831, ADC0834) Note: For ADC0832 add I . REF Voltage REF 00558343 00558345 Output Current vs. Temperature 00558347 7 Linearity Error vs. ...

Typical Performance Characteristics Leakage Current Test Circuit TRI-STATE Test Circuits and Waveforms www.national.com (Continued) Power Supply Current vs. f CLK 00558349 00558350 8 00558329 00558303 t 1H 00558351 t 0H 00558352 ...

Timing Diagrams Data Input Timing *LSB first output not available on ADC0831. 00558324 ADC0831 Start Conversion Timing ADC0831 Timing 9 Data Output Timing 00558325 00558326 00558327 www.national.com ...

Timing Diagrams (Continued) www.national.com ADC0832 Timing ADC0834 Timing 10 00558328 00558305 ...

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Functional Description 1.0 multiplexer Addressing The design of these converters utilizes a sample-data com- parator structure which provides for a differential analog input to be converted by a successive approximation routine. The actual voltage converted is always the difference be- ...

Functional Description Single-Ended MUX Mode MUX Address SGL/ ODD/ DIF SIGN Differential MUX Mode MUX Address SGL/ ODD/ DIF SIGN ...

Functional Description Since the input configuration is under software control, it can be modified, as required, at each conversion. A channel can be treated as a single-ended, ground referenced input for one conversion; then it can be reconfigured as part ...

Functional Description 8 Single-Ended 4 Differential FIGURE 1. Analog Input Multiplexer Options for the ADC0838 3. On each rising edge of the clock the status of the data in (DI) line is clocked into the MUX address shift register. The ...

Functional Description possible because the DI input is only “looked-at” during the MUX addressing interval while the DO line is still in a high impedance state. 3.0 Reference Considerations The voltage applied to the reference input to these convert- ers ...

Functional Description resistance of the analog signal source. Bypass capacitors should not be used if the source resistance is greater than 1 kΩ. This source resistance limitation is important with regard to the DC leakage currents of input multiplexer as ...

Applications FIGURE 4. Operating with a Temperature Compensated Reference FIGURE 5. Using the A/D as the System Supply Regulator Digital Link and Sample Controlling Software for theSerially Oriented COP420 and the Bit Programmable I/O INS8048 00558312 *4.5V ≤ V ≤ ...

Applications (Continued) Cop Coding Example Mnemonic Instruction LEI ENABLES SIO’s INPUT AND OUTPUT OGI G0=0 (CS =0) CLR A CLEARS ACCUMULATOR AISC 1 LOADS ACCUMULATOR WITH 1 XAS EXCHANGES SIO WITH ACCUMULATOR AND STARTS SK CLOCK ...

Applications (Continued) A “Stand-Alone” Hook-Up for ADC0838 Evaluation * Pinouts shown for ADC0838. For all other products tie to pin functions as shown. Low-Cost Remote Temperature Sensor 21 00558359 00558360 www.national.com ...

Applications (Continued) *V (− ≤ V ≤ XDR CC www.national.com Digitizing a Current Flow Operating with Ratiometric Transducers 22 00558315 00558337 ...

Applications (Continued) ≤3V Span Adjust: 0V≤V IN ≤5V Zero-Shift and Span Adjust: 2V≤ 00558361 00558362 www.national.com ...

Applications (Continued) Controller performs a routine to determine which input polarity (9-bit example) or which channel pair (10-bit example) provides a non-zero output code. This information provides the extra bits. www.national.com Obtaining Higher Resolution 00558363 a) 9-Bit A/D 00558364 b) ...

Applications (Continued) Diodes are 1N914 > all − < all − Protecting the Input 00558318 High Accuracy Comparators 00558338 25 www.national.com ...

Applications (Continued) • Uses one more wire than load cell itself • Two mini-DIPs could be mounted inside load cell for digital output transducer • Electronic offset and gain trims relax mechanical specs for gauge factor and offset • Low ...

Applications (Continued) • No power required remotely • 1500V isolation Isolated Data Converter 27 00558339 www.national.com ...

Applications (Continued) www.national.com Two Wire Interface for 8 Channels 28 00558321 ...

Applications (Continued) Two Wire 1-Channels Interface 29 00558322 www.national.com ...

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) Wide Body Molded Small-Outline Package (WM) NS Package Number M14B 30 ...

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Wide Body Molded Small-Outline Package (WM) NS Package Number M20B Molded Dual-In-Line Package (N) NS Package Number N08E 31 www.national.com ...

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) NS Package Number N14A Molded-Dual-In-Line Package (N) NS Package Number N20A 32 ...

... 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 ...