(FREQUENCLY ASKED QUESTIONS) have four channel part? What recomme

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(FREQUENCLY ASKED QUESTIONS) have four channel part? What recomme

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CS5525/6/9
(FREQUENCLY ASKED QUESTIONS)
have four channel part? What recommended need more less bandwidth than provided on-chip digiNot this time, have plans multital filter? channel product `97. also have digital output lines which used control either external clock between switches multiplexer through ADC's se100 scale digital filters corner frerial port, thus eliminating extra port quency accordingly. Example: Using clock system additional opto-isolators 3x32.768 word rate isolated applications. 3.76 11.28
does 4-bit digital latch fast converter shift data from seallow change channels? rial port? CS5525 CS5526 well CS5504 MHz. family ADC's designed settle does instrumentation amplifier's chopconversion cycle. This means ping frequency affect converter's input imswitched from channel-to-channel with every pedance input current? conversion while maintaining resolution acThe input impedance converter dycuracy. namic impedance depends whether What determines input span convertinstrumentation amplifier engaged not. lower ranges mV), Performing full scale gain calibration, modinstrumentation amplifier engaged setting ifying reference voltage. example, input impedance 1/fC (where reference voltage reduced default chopping frequency, either input ranges scale half. Example: 32,768). typical input impedance lowVref ranges 1900 (with 256, Vref 1.25 12.5 pF). higher ranges amplifier bypassed leaving equiv4) does output word rate affect ADC's alent input impedance 1/fC where bandwidth? either 32,768. typical input imThe input bandwidth limited selectpedance higher ranges (with output word rate Nyquist theory pF). sampling. Example: With default outThe input current dynamic current also word rate available signal bandwidth depends whether instrumentation amplithe fier engaged not. lower ranges further information, please contact Crystal Semiconductor (512) 445-7222 (800) 888-5016
Cirrus Logic, Inc. Crystal Semiconductor Products Division P.O. 17847, Austin, Texas 78760 (512) 7222 FAX: (512) 7581 http://www.crystal.com
Copyright Cirrus Logic, Inc. 1997 (All Rights Reserved)
DS202TB1
CS5525/6/9
mV), input current fVosC (where offset instrumentation amplifier, typically less than chopping frequency, either 32,768, pF). typical input current lower ranges higher ranges input current [(VAIN+)-(VAIN-)]fC where (VAIN+)(VAIN-) voltage between AIN+ AIN-, either 32,768, typical input current higher ranges µA/V. When reading conversion data zeroes matter what analog signal Please explain why. Check voltage between pins (VREF+ VREF-). zero, converter will compute zeros because digital output word represents ratio input signal voltage reference. calibration required converter? When CS5525/26 reset, registers known values. signal measured converter within nominal range, converter perform conversions without need calibrations. Errors system remain present when calibration performed, however, this acceptable errors insignificant measurement errors removed some other means, such software registers microcontroller. often need recalibrate? answer this question must ask: What accuracy required from converter? What effects will temperature changes have upon entire circuit, including components outside A/D? obtain optimum calibration accuracy, calibration should performed approximately minute after power applied allow chip reach thermal equilibrium. higher accuracy measurement requirement will generally require calibrations more often, because, after initial calibration been performed, converter subject some drift operating temperature changes. Typical offset drift gain drift given data sheet tables. observed drift application circuit considerably greater parasitic thermocouple effects gain drift caused limited tempco tracking external resistors. Once estimate drift determined entire application circuit (drift will usually dominated error sources external converter), assessment affects measurement accuracy temperature changes made. Once amount drift known, determine calibration required. good rule thumb recalibrate converter system) with every degrees ambient temperature change. What numbers calibration registers actually mean? There internal read/write calibration registers CS5525/26 (offset, gain). offset register 2-24 proportion input span (bipolar span times unipolar span). offset register determines offset that trimmed either positive negative. converter typically trim ±50% input span. gain register spans from 2-23). decimal equivalent meaning gain register b020+ b12-1 b22-2 b32-3 bN2-N where binary numbers have value either zero one. After gain calibration been performed, numeric value gain register should exceed range (decimal) [400000(Hex) FFFFFF(Hex)].
DS202TB1
CS5525/6/9
gain calibrated full-scale signal available? CS5525/26 gain calibrated with some input signal other than full scale. example, when converter reset, gain register's calibration word (decimal). signal representing percent full scale reads three percent less than should, value gain register scaled three percent. Gain accuracy improved output words averaged while using this technique. caution when calibration signal less than full scale being used. transfer function transducer being used generate percent signal happens have major nonlinearity point which calibration being performed, will cause rest transfer function incorrect. does offset move when CS5525/26 with reference, calibrated several times? What done prevent this? CS5526 20-bit with inherent Gaussian thermal quantization noise associated with each conversion. Therefore, every time converter calibrated, different offset calibration output chance occurring. averaging conversions, peak-to-peak noise reduced factor 1/sqrt(n) (where number samples taken). offset register accessed after calibration, offset uncertainty converter almost eliminated code) averaging. CS5525 (16-bits) always count variability, even averaged, because noise calibration occur boundary between codes. calibration code boundary random noise could toggle offset between codes. different calibration required each gain getting? maximum accuracy, calibrations should performed offset gain each gain setting. factory calibration performed using system calibration, offset gain register contents read system microcontroller stored EEPROM. These same calibration words then uploaded into offset gain registers converter when power re-applied system, when gain range changed. What advantage performing calibrations lower output word rates? Calibrations performed output word rate selected WR2-WR0 bits configuration register. Since higher word rates result conversion words with more peak-topeak noise, better calibrate lower output word rates. minimize digital noise near device, user should wait each calibration step completed before reading writing serial port. best noise performance from CS5525/26? bipolar mode increase reference voltage, since each these increase size LSB. charge pump engaged, ensure that converter external components intrinsically safe? Intrinsic safety prohibits electrolytic bipolar) capacitors thus limiting certain size capacitors. Although cap. recommended charge pump, 0.47 ceramic caps parallel used.
DS202TB1
CS5525/6/9
What benefit does evaluation board offer? CDB5525/26 evaluation board saves time money over prototyping. preassembled board comes equipped with 80C51 microcontroller 9-pin cable link evaluation board PC-compatible computer. evaluation system also includes software which provides easy access internal registers converter displays converter's time domain, frequency domain noise histogram performance. analog power supply configurations differ between CS5525/26 CS5529? CS5525/26 converters powered from single analog supply either +3.3 digital supply. They have charge pump which uses external diodes external capacitors generate negative supply negative bias voltage) allowing digitization ground-referenced signals. negative bias voltage supplied from separate negative supply, desired. CS5529 converter designed operate from single dual ±2.5 analog supply either +3.3 digital supply. Since CS5529 powered from negative analog supply, level shifting circuitry eliminated when measuring ground-referenced signals. voltage references differ between CS5525/26 CS5529? CS5529 supports differential reference voltages analog supply allowing analog supply serve reference voltage. reference's inputs buffered through coarse/fine charge buffer. Since inputs buffered, dynamic current typically independent reference voltage. CS5525/26 have buffers support differential reference voltage Since their reference inputs aren't buffered dynamic input current typically µA/V. CS5525/26 CS5529 analog input ranges differ? CS5529 nominal input range ±2.5 (with VREF=2.5 analog inputs this range have coarse/fine charge buffer which reduces dynamic current typically CS5525/26 have instrumentation amplifier programmable gain amplifier which provides nominal input ranges instrumentation amplifier chopper stabilized amplifier serves buffer reducing dynamic input current typically ranges CS5525/26, instrumentation amplifier bypassed buffer exists reduce input current. these ranges input current typically µA/V. output word rates differ between CS5525/26 CS5529? three converters have eight output word rates. CS5529 samples rate CS5525/26. Therefore, CS5529's output word rate CS5525/26.
DS202TB1
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