Rainbow-electronics ADC14061 Manual do Utilizador

ADC14061Self-Calibrating 14-Bit, 2.5 MSPS, 390 mW A/D ConverterGeneral DescriptionThe ADC14061 is a self-calibrating 14-bit, 2.5 Megasampleper second

Typical Performance CharacteristicsINL vs TemperatureDS100103-25DNL vs TemperatureDS100103-26SNR vs TemperatureDS100103-27INL vs VREFand TemperatureDS

Specification DefinitionsAPERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DEL

Timing Diagrams (Continued)DS100103-16TIMING DIAGRAM 2. Reset and Calibrationwww.national.com 12

Functional DescriptionOperating on a single +5V supply, the ADC14061 uses apipelined architecture and has error correction circuitry and acalibration

Applications Information (Continued)The sign bit of the output word will be a logic low when VIN+is greater than VIN− . When VIN+ is less than VIN−, t

Applications Information (Continued)To avoid signal clipping and distortion, VREF+OUTshould notexceed 3.3V, VREF−OUTshould not be below 750 mV andVCMs

Applications Information (Continued)DS100103-20FIGURE 7. Differential drive circuit ofFigure 6. All 5k resistors are 0.1%. Tolerance of the other resi

Applications Information (Continued)5.0 LAYOUT AND GROUNDINGProper grounding and proper routing of all signals are essen-tial to ensure accurate conve

Applications Information (Continued)6.0 DYNAMIC PERFORMANCEThe ADC14061 can achieve impressive dynamic perfor-mance. To achieve the best dynamic perfo

Applications Information (Continued)put alternates between 12 pF and 28 pF, depending upon thephase of the clock. This dynamic loaad is more difficult

Block DiagramDS100103-2www.national.com 2

Physical Dimensions inches (millimeters) unless otherwise notedLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENT

Pin Descriptions and Equivalent CircuitsPinNo.Symbol Equivalent CircuitDescriptionAnalog I/O1VIN+Non-Inverting analog signal Input. With a 2.0V refere

Pin Descriptions and Equivalent Circuits (Continued)Digital I/O10 ClockDigital clock input. The range of frequencies for this input is 300 kHz to 2.5M

Pin Descriptions and Equivalent Circuits (Continued)Digital Power20 VDPositive digital supply pin. This pin should be connected to the same clean,quie

Absolute Maximum Ratings (Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distribut

DC and Logic Electrical CharacteristicsThe following specifications apply for AGND=DGND=DGND I/O=0V, V+=VA=VD=+5.0V, VDI/O=3.0V or 5.0V,PD=+5V, VREF+=

AC Electrical Characteristics (Continued)The following specifications apply for AGND=DGND=DGND I/O=0V, V+=VA=VD=+5.0V, VDI/O=3.0V or 5.0V,PD=+5V, VREF

AC Electrical Characteristics (Continued)DS100103-13FIGURE 1. Transfer CharacteristicsDS100103-14FIGURE 2. Errors removed by Auto-Cal cyclewww.nationa