Rainbow-electronics АDC0805 Manual de usuario

TL/H/5671ADC0801/ADC0802/ADC0803/ADC0804/ADC08058-Bit mP Compatible A/D ConvertersDecember 1994ADC0801/ADC0802/ADC0803/ADC0804/ADC08058-Bit mP Compati

Typical Applications (Continued)Handlingg5V Analog InputsTL/H/5671–33*Beckman InstrumentsÝ694-3-R10K resistor arrayRead-Only InterfaceTL/H/5671–34mP I

Typical Applications (Continued)3-Decade Logarithmic A/D ConverterNoise Filtering the Analog InputfCe20 HzUses Chebyshev implementation for steeper ro

Typical Applications (Continued)Sampling an AC Input SignalNote 1: Oversample whenever possible[keep fsl2f(b60)]to eliminate input frequency folding(a

Functional Description1.0 UNDERSTANDING A/D ERROR SPECSA perfect A/D transfer characteristic (staircase waveform) isshown inFigure 1a. The horizontal

Functional Description (Continued)2.0 FUNCTIONAL DESCRIPTIONThe ADC0801 series contains a circuit equivalent of the256R network. Analog switches are s

Functional Description (Continued)After the ‘‘1’’ is clocked through the 8-bit shift register(which completes the SAR search) it appears as the input

Functional Description (Continued)The voltage on this capacitance is switched and will result incurrents entering the VIN(a) input pin and leaving the

Functional Description (Continued)*Add if VREF/2s1VDCwith LM358to draw 3 mA to ground.TL/H/5671–16a) Analog Input Signal Example b) Accommodating an A

Functional Description (Continued)2.5.3 Adjusting for an Arbitrary Analog Input VoltageRangeIf the analog zero voltage of the A/D is shifted away from

Functional Description (Continued)A single point analog ground that is separate from the logicground points should be used. The power supply bypasscap

Absolute Maximum Ratings (Notes1&2)If Military/Aerospace specified devices are required,please contact the National Semiconductor SalesOffice/Dist

Functional Description (Continued)FIGURE 8. A/D Tester with Analog Error OutputTL/H/5671–19FIGURE 9. Basic ‘‘Digital’’ A/D TesterTABLE I. DECODING THE

Functional Description (Continued)TL/H/5671–20Note 1: *Pin numbers for the DP8228 system controller, others are INS8080A.Note 2: Pin 23 of the INS8228

Functional Description (Continued)The standard control bus signals of the 8080 CS,RDandWR) can be directly wired to the digital control inputs of theA

Functional Description (Continued)4.2 Interfacing the Z-80The Z-80 control bus is slightly different from that of the8080. General RDand WR strobes ar

Functional Description (Continued)SAMPLE PROGRAM FORFIGURE 14ADC0801-MC6800 CPU INTERFACE0010 DF 36 DATAIN STX TEMP2 ; Save contents of X0012 CE 00 2C

Functional Description (Continued)SAMPLE PROGRAM FORFIGURE 15ADC0801– MC6820 PIA INTERFACE0010 CE 00 38 DATAIN LDX #$0038 ; Upon IRQlow CPU0013 FF FF

Functional Description (Continued)TL/H/5671–26Note 1: Numbers in parentheses refer to MC6800 CPU pin out.Note 2: Numbers of letters in brackets refer

Functional Description (Continued)SAMPLE PROGRAM FORFIGURE 16INTERFACING MULTIPLE A/Ds IN AN MC6800 SYSTEMADDRESS HEX CODE MNEMONICS COMMENTS0033 A7 0

Functional Description (Continued)Note 1: R2e49.5 R1Note 2: Switches are LMC13334 CMOS analog switches.Note 3: The 9 resistors used in the auto-zero s

A flow chart for the zeroing subroutine is shown inFigure19. It must be noted that the ADC0801 series will output anall zero code when it converts a n

AC Electrical Characteristics (Continued)The following specifications apply for VCCe5VDCand TMINsTAsTMAX, unless otherwise specified.Symbol Parameter

3D00 3E90 MVI 903D02 D3E7 Out Control Port ; Program PPI3D04 2601 MVI H 01 Auto-Zero Subroutine3D06 7C MOV A,H3D07 D3E6 OUT C ; Close SW1 open SW23D09

TL/H/5671–29FIGURE 21. Multiple A/Ds with Z-80 Type MicroprocessorINTERRUPT SERVICING SUBROUTINESOURCELOC OBJ CODE STATEMENT COMMENT0038 E5 PUSH HL ;

Ordering InformationTEMP RANGE 0§CTO70§C0§CTO70§C0§CTO70§Cb40§CTOa85§Cg(/4 Bit ADC0801LCNAdjustedERRORg(/2 Bit ADC0802LCWM ADC0802LCV ADC0802LCNUnadju

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Physical Dimensions inches (millimeters)Dual-In-Line Package (J)Order Number ADC0801LJ, ADC0802LJ, ADC0801LCJ,ADC0802LCJ, ADC0803LCJ or ADC0804LCJADC0

Physical Dimensions inches (millimeters) (Continued)Molded Dual-In-Line Package (N)Order Number ADC0801LCN, ADC0802LCN,ADC0803LCN, ADC0804LCN or ADC08

ADC0801/ADC0802/ADC0803/ADC0804/ADC08058-Bit mP Compatible A/D ConvertersPhysical Dimensions inches (millimeters) (Continued)Molded Chip Carrier Packa

Typical Performance CharacteristicsLogic Input Threshold Voltagevs. Supply VoltageDelay From Falling Edge ofRDto Output Data Validvs. Load Capacitance

TRI-STATE Test Circuits and Waveformst1Ht1H,CLe10 pFtre20 nst0Ht0H,CLe10 pFtre20 nsTL/H/5671–3Timing Diagrams (All timing is measured from the 50% vol

Typical Applications (Continued)6800 Interface Ratiometric with Full-Scale AdjustNote: before using caps at VINor VREF/2,see section 2.3.2 Input Bypas

Typical Applications (Continued)Directly Converting a Low-Level SignalVREF/2e256 mVA mP Interfaced ComparatorFor: VIN(a)lVIN(b)OutputeFFHEXFor: VIN(a)

Typical Applications (Continued)Self-Clocking Multiple A/Ds*Use a large R valueto reduce loadingat CLK R output.External Clocking100 kHzsfCLKs1460 kHz

Typical Applications (Continued)mP Compatible Differential-Input Comparator with Pre-Set VOS(with or without Hysteresis)*SeeFigure 5to select R valueD