Rainbow-electronics ADC12038 Manual do Utilizador

TL/H/11354ADC12H030/ADC12H032/ADC12H034/ADC12H038,ADC12030/ADC12032/ADC12034/ADC12038Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with

Electrical Characteristics (Continued)TL/H/11354– 10FIGURE 1a. Transfer CharacteristicTL/H/11354– 11FIGURE 1b. Simplified Error Curve vs Output Code w

Electrical Characteristics (Continued)TL/H/11354– 12FIGURE 1c. Simplified Error Curve vs Output Code after Auto-Calibration CycleTL/H/11354– 13FIGURE

Typical Performance CharacteristicsThe following curves apply for 12-bitasign mode after auto-calibration unless otherwise specified. The performance

Typical Performance Characteristics (Continued)The following curves apply for 12-bitasign mode after auto-calibration unless otherwise specified. The

Typical Dynamic Performance Characteristics (Continued)The following curves apply for 12-bitasign mode after auto-calibration unless otherwise specifi

Test CircuitsDO ‘‘TRI-STATE’’ (t1H,t0H)TL/H/11354– 3DO except ‘‘TRI-STATE’’TL/H/11354– 4Leakage CurrentTL/H/11354– 5Timing DiagramsDO Falling and Risi

Timing Diagrams (Continued)DO Data Output Timing Using CSTL/H/11354– 21DO Data Output Timing with CS Continuously LowTL/H/11354– 22ADC12038 Auto Cal o

Timing Diagrams (Continued)ADC12038 Read Data without Starting a Conversion Using CSTL/H/11354– 24ADC12038 Read Data without Starting a Conversion wit

Timing Diagrams (Continued)ADC12038 Conversion Using CSwith 8-Bit Digital Output FormatTL/H/11354– 26ADC12038 Conversion Using CS with 16-Bit Digital

Timing Diagrams (Continued)ADC12038 Conversion with CSContinuously Low and 8-Bit Digital Output FormatTL/H/11354– 28ADC12038 Conversion with CS Contin

Connection Diagrams16-Pin Dual-In-Line andWide Body SO PackagesTL/H/11354– 6Top View20-Pin Dual-In-Line andWide Body SO PackagesTL/H/11354– 7Top View2

Timing Diagrams (Continued)ADC12038 Software Power Up/Down Using CSwith 16-Bit Digital Output FormatTL/H/11354– 52ADC12038 Software Power Up/Down with

Timing Diagrams (Continued)ADC12038 Hardware Power Up/DownTL/H/11354– 32Note: Hardware power up/down may occur at any time. If PD is high while a conv

Pin DescriptionsCCLK The clock applied to this input controls the su-cessive approximation conversion time intervaland the acquisition time. The rise

Pin Descriptions (Continued)VREFaThis is the positive analog voltage reference in-put. In order to maintain accuracy, the voltagerange of VREF(VREFeVR

TablesTABLE I. Data Out FormatsDO Formats DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 DB8 DB9 DB10 DB11 DB12 DB13 DB14 DB15 DB16Signwith17X X X X Sign MSB 10 9 8

Tables (Continued)TABLE III. ADC12034 Multiplexer AddressingAnalog Channel AddressedA/D InputMultiplexerModeMUX and AssignmentPolarityOutputAddress wi

Tables (Continued)TABLE V. Mode ProgrammingADC12038 DI0 DI1 DI2 DI3 DI4 DI5 DI6 DI7Mode Selected(Current)(next ConversionDO FormatCycle)ADC12034 DI0 D

Tables (Continued)TABLE VII. Status RegisterStatus BitDB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 DB8LocationStatus Bit PU PD Cal 8 or 9 12 or 13 16 or 17 Sign Ju

Application Hints (Continued)it will expect to see 13 SCLK pulses for each I/O transmis-sion. The number of SCLK pulses that the ADC expects tosee is

Application Hints (Continued)1.6 User Mode and Test ModeAn instruction may be issued to the ADC to put it into testmode. Test mode is used by the manu

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

Application Hints (Continued)With the single-ended multiplexer configuration CH0through CH7 can be assigned to the MUXOUT1 pin. TheCOM pin is always a

Application Hints (Continued)For pseudo-differential signed operation, the biasing circuitshown inFigure 10shows a signal AC coupled to the ADC.This g

Application Hints (Continued)TL/H/11354– 49FIGURE 12. Pseudo-Differential Biasing without the Loss of Digital Output RangeTL/H/11354– 50FIGURE 13. Ful

Application Hints (Continued)3.0 REFERENCE VOLTAGEThe difference in the voltages applied to the VREFaandVREFbdefines the analog input span (the differ

Application Hints (Continued)6.0 INPUT SOURCE RESISTANCEFor low impedance voltage sources (k600X), the inputcharging current will decay, before the en

Application Hints (Continued)11.0 CLOCK SIGNAL LINE ISOLATIONThe ADC12030/2/4/8’s performance is optimized by rout-ing the analog input/output and ref

Application Hints (Continued)TL/H/11354– 44Note: VAa,VDa, and VREFaon the ADC12038 each have 0.01 mF and 0.1 mF chip caps, and 10 mF tantalum caps. Al

Application Hints (Continued)’variables DOL4Data Out word length, DI4Data string for A/D DI input,’DO4A/D result string’SET CS# HIGHOUT &H3FC, (&a

Physical Dimensions inches (millimeters)Order Number ADC12030CIWM or ADC12H030CIWMNS Package Number M16BOrder Number ADC12032CIWM or ADC12H032CIWMNS P

Physical Dimensions inches (millimeters) (Continued)Order Number ADC12034CIWM or ADC12H034CIWMNS Package Number M24BOrder Number ADC12038CIWM or ADC12

Converter Electrical Characteristics (Continued)The following specifications apply for VaeVAaeVDaea5.0 VDC,VREFaea4.096 VDC,VREFbe0VDC, 12-bitasign co

Physical Dimensions inches (millimeters) (Continued)Order Number ADC12030CIN or ADC12H030CINNS Package Number N16EOrder Number ADC12032CIN or ADC12H03

Physical Dimensions inches (millimeters) (Continued)Order Number ADC12034CIN or ADC12H034CINNS Package Number N24C41

ADC12H030/ADC12H032/ADC12H034/ADC12H038,ADC12030/ADC12032/ADC12034/ADC12038Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sa

Electrical CharacteristicsThe following specifications apply for VaeVAaeVDaea5.0 VDC,VREFaea4.096 VDC,VREFbe0VDC, 12-bitasign conversion mode, fCKefSK

DC and Logic Electrical CharacteristicsThe following specifications apply for VaeVAaeVDaea5.0 VDC,VREFaea4.096 VDC,VREFbe0VDC, 12-bitasign conversion

AC Electrical CharacteristicsThe following specifications apply for VaeVAaeVDaea5.0 VDC,VREFaea4.096 VDC,VREFbe0VDC, 12-bitasign conversion mode, tret

AC Electrical Characteristics (Continued)The following specifications apply for VaeVAaeVDaea5.0 VDC,VREFaea4.096 VDC,VREFbe0VDC, 12-bitasign conversio

Electrical Characteristics (Continued)Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings