Rainbow-electronics ADC12048 Manual de usuario

TL/H/12387ADC12048 12-Bit Plus Sign 216 kHz 8-Channel Sampling Analog-to-Digital ConverterDecember 1995ADC1204812-Bit Plus Sign 216 kHz 8-Channel Samp

Electrical Characteristics (Continued)TL/H/12387–9FIGURE 5a. Transfer CharacteristicTL/H/12387–10FIGURE 5b. Simplified Error vs Output Code without Au

Electrical Characteristics (Continued)TL/H/12387–11FIGURE 5c. Simplified Error vs Output Code after Auto-Calibration CycleTL/H/12387–12FIGURE 6. Offse

Timing DiagramsTL/H/12387–13FIGURE 7a. Sync-Out Write (WMODEe1, BWe1), Read and Convert CyclesTL/H/12387–14FIGURE 7b. Sync-In Write (WMODEe1, BWe1), R

Timing Diagrams (Continued)TL/H/12387–46FIGURE 7c. Sync-Out Write (WMODEe0, BWe1), Read and Convert CyclesTL/H/12387–47FIGURE 7d. Sync-In Write (WMODE

Timing Diagrams (Continued)TL/H/12387–48FIGURE 7e. Sync-Out Read and Convert Cycles. The MUX channelis the channel selected on the most recent write c

Timing Diagrams (Continued)TL/H/12387–50FIGURE 7g. 8-Bit Bus Read Cycle (Sync-Out)TL/H/12387–51FIGURE 7h. 8-Bit Bus Read Cycle (Sync-In)15

Timing Diagrams (Continued)TL/H/12387–15FIGURE 7i. Write Signal Negates RDY (Writing the Standby, Auto-Cal or Auto-Zero Command)TL/H/12387–16FIGURE 7j

Typical Performance Characteristics (See Note 19, Electrical Characteristic Section)Integral Linearity Error (INL)Change vs Clock FrequencyTL/H/12387–

Typical Performance Characteristics (Continued) (See Note 21, Electrical Characteristic Section)Supply Currents vsClock FrequencyTL/H/12387–42Referenc

Typical Performance Characteristics (Continued) The curves were obtained under the followingconditions. RSe50X,TAe25§C, VAaeVDae5V, VREFe4.096V, fCLKe

Connection DiagramsPLCC PackageTL/H/12387–2Order Number ADC12048CIVSee NS Package Number V44APQFP PackageTL/H/12387–3Order Number ADC12048CIVFSee NS P

Pin DescriptionPLCC Pkg. PQFP Pkg.Pin Name DescriptionPin Number Pin Number6 44 CH0 The eight analog inputs to the Multiplexer. Active channels are se

Register Bit DescriptionCONFIGURATION REGISTER (Write Only)This is a 13-bit write-only register that is used to program the functionality of the ADC12

Functional DescriptionThe ADC12048 is programmed through a digital interfacethat supports an 8-bit or 16-bit data bus. The digital inter-face consists

Features and Operating Modes (Continued)less than 1 kX and any active or reactive source circuitrysettles to 12 bits in less than 500 ns. When source

Features and Operating Modes (Continued)conversion, two reads must be performed from theADC12048. The rising edge of the second read pulse willforce t

Analog Application InformationREFERENCE VOLTAGEThe ADC12048 has two reference inputs, VREFaandVREFb. They define the zero to full-scale range of the a

Analog Application Information (Continued)INPUT CURRENTAt the start of the acquisition window (tAcqSYNOUT) a charg-ing current (due to capacitive swit

Analog Application Information (Continued)TL/H/12387–38FIGURE 10. Top View of Printed Circuit Board for a 44-Pin PLCC ADC12048When measuring AC input

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Physical Dimensions inches (millimeters)44-Lead Molded Plastic Leaded Chip CarrierOrder Number ADC12048CIVNS Package Number V44A29

Absolute Maximum Ratings (Notes 1 and 2)If Military/Aerospace specified devices are required,please contact the National Semiconductor SalesOffice/Dis

ADC12048 12-Bit Plus Sign 216 kHz 8-Channel Sampling Analog-to-Digital ConverterPhysical Dimensions inches (millimeters) (Continued)44-Lead (10mm x 10

Power Supply Characteristics The following specifications apply to the ADC12048 for VAaeVDae5V,VREFae4.096V, VREFbe0.0V, 12-bitasign conversion mode,

Reference Inputs The following specifications apply to the ADC12048 for VAaeVDae5V, VREFae4.096V,VREFbe0.0V, 12-bitasign conversion mode, fCLKe12.0 MH

Digital Timing Characteristics The following specifications apply to the ADC12048, 13-bit data bus width,VAaeVDae5V, fCLKe12 MHz, tfe3 ns and CLe50 pF

Notes on Specifications (Continued)Note 6: Each input and output is protected by a nominal 6.5V breakdown voltage zener diode to GND; as shown below,

Electrical CharacteristicsTL/H/12387–5FIGURE 1. Output Digital Code vs the Operating Input Voltage Range (General Case)TL/H/12387–6FIGURE 2. Output Di

Electrical Characteristics (Continued)TL/H/12387–7FIGURE 3. VREFOperating Range (General Case)TL/H/12387–8FIGURE 4. VREFOperating Range for VAe5V9