Rainbow-electronics ADC08038 Manual do Utilizador

TL/H/10555ADC08031/ADC08032/ADC08034/ADC08038 8-Bit High-Speed Serial I/O A/D Converters withMultiplexer Options, Voltage Reference, and Track/Hold Fu

ADC08038 Functional Block DiagramTL/H/10555–17*Some of these functions/pins are not available with other options.Note 1: For the ADC08034, the ‘‘SEL 1

Functional Description1.0 MULTIPLEXER ADDRESSINGThe design of these converters utilizes a comparator struc-ture with built-in sample-and-hold which pr

Functional Description (Continued)TABLE II. MUX Addressing: ADC08038 (Continued)Differential MUX ModeMUX Address Analog Differential Channel-PairÝSTAR

Functional Description (Continued)Since the input configuration is under software control, itcan be modified as required before each conversion. Achan

Functional Description (Continued)3. When the start bit has been shifted into the start locationof the MUX register, the input channel has been assign

Functional Description (Continued)4.0 THE ANALOG INPUTSThe most important feature of these converters is that theycan be located right at the analog s

ApplicationsA ‘‘Stand-Alone’’ Hook-Up for ADC08038 Evaluation*Pinouts shown for ADC08038.For all other products tie to pin functions as shown.Low-Cost

Applications (Continued)Digitizing a Current FlowTL/H/10555–22Operating with Ratiometric Transducers*VIN(b)e0.15 VCC15% of VCCsVXDRs85% of VCCTL/H/105

Applications (Continued)Span Adjust; 0VsVINs3VZero-Shift and Span Adjust: 2VsVINs5VTL/H/10555–2418

Applications (Continued)Protecting the InputDiodes are 1N914TL/H/10555–25High Accuracy ComparatorsDOeall 1s ifaVINlbVINDOeall 0s ifaVINkbVINTL/H/10555

Connection DiagramsADC08038TL/H/10555–2ADC08034TL/H/10555–3ADC08032Dual-In-Line PackageTL/H/10555–4ADC08031Dual-In-Line PackageTL/H/10555–5ADC08032Sma

Applications (Continued)4 mA– 20 mA Current Loop Converter#All power supplied by loop TL/H/10555–28#1500V isolation at outputIsolated Data Converter#N

Physical Dimensions inches (millimeters)Order Number ADC08031BIWM, ADC08031CIWM,ADC08032BIWM, ADC08032CIWM,ADC08034BIWM or ADC08034CIWMNS Package Numb

Physical Dimensions inches (millimeters) (Continued)Order Number ADC08038BIWM or ADC08038CIWMNS Package Number M20BOrder Number ADC08031BIN, ADC08031C

Physical Dimensions inches (millimeters) (Continued)Order Number ADC08034BIN or ADC08034CINNS Package Number N14A23

ADC08031/ADC08032/ADC08034/ADC08038 8-Bit High-Speed Serial I/O A/D Converters withMultiplexer Options, Voltage Reference, and Track/Hold FunctionPhys

Absolute Maximum Ratings (Notes1&3)If Military/Aerospace specified devices are required,please contact the National Semiconductor SalesOffice/Dist

Electrical Characteristics (Continued)The following specifications apply for VCCeVREFea5VDC, and fCLKe1 MHz unless otherwise specified. Boldface limit

Electrical Characteristics (Continued)The following specifications apply for VCCeVREFea5VDC, and tretfe20 ns unless otherwise specified. Boldface limi

Typical Performance CharacteristicsReference VoltageLinearity Error vsTemperatureLinearity Error vsClock FrequencyLinearity Error vsADC08034, ADC08031

TRI-STATE Test Circuits and Waveformst1Ht0HTL/H/10555–8t1Ht0HTL/H/10555–9Timing DiagramsData Input TimingTL/H/10555–10*To reset these devices, CLK and

Timing Diagrams (Continued)ADC08031 TimingTL/H/10555–13*LSB first output not available on ADC08031.LSB information is maintained for remainder of cloc

Timing Diagrams (Continued)ADC08038 TimingTL/H/10555–16*Make sure clock edgeÝ18 clocks in the LSB before SE is taken low9