16-Bit, Programmable with 6-Bit Latch following information based

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16-Bit, Programmable with 6-Bit Latch following information based

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CS5529
16-Bit, Programmable with 6-Bit Latch
following information based technical datasheet: CS5529 DS246PP1 AUG'97 Please contact Cirrus Logic Crystal Semiconductor Products Division further information.
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Copyright Cirrus Logic, Inc. 1997 (All Rights Reserved)
PI246PP1
CS5529
Features
16-Bit, Programmable with 6-Bit Latch
Features
Delta-Sigma Converter
Linearity Error: 0.0015%FS Noise Free Resolution: 16-Bits Bipolar/Unipolar Input Range
6-Bit Output Latch Simple three-wire serial interface
SPIand MicrowireCompatible Schmitt Trigger SCLK Selectable Output Word Rates
Voltage Reference Input Capability Output Settles Conversion Cycle System Self-Calibration with Read/Write Registers Single Dual ±2.5 Analog Supply
+3.0 Digital Supply
Power Consumption:
Description
16-bit CS5529 low-power programmable converter which includes digital filter, self system calibration circuitry. chip designed operate from single analog supply ±2.5 analog supplies with either digital supply.
PI246PP1
CS5529
Overview
digital filter programmable with output update rates between 1.88 (XIN 32.768 kHz). Output word rates increased approximately using kHz. filter designed settle full accuracy selected output word rate conversion. When operated word rates less (XIN 32.768 kHz), filter rejects both line interference simultaneously. power, single conversion settling time, programmable output rates, ability handle negative input signals make this single dual supply product ideal solution isolated non-isolated applications.
VAAIN+
DGND Digital Filter Differential order deltasigma modulator
AINVREF+ VREF1X
Calibration Register Control Register
Output Register
SCLK
Latch
Calibration Memory
Calibration
Clock Gen.
XOUT
Overview
CS5529 16-bit monolithic CMOS converter optimized measure unipolar bipolar signals industrial applications. CS5529 includes coarse charge buffers, fourth order delta-sigma modulator, calibration microcontroller, digital filter with selectable decimation rates, 6-bit output latch, serial port. digital filter eight different output conversion word rates when chip operating from 32.768 watch crystal equivalent clock.
PI246PP1
CS5529
FAQs FAQs
have four channel part? this time, have plans multi-channel product `97. also have digital output lines which used control either switches multiplexer through ADC's serial port, thus eliminating extra port system additional opto-isolators isolated applications. does 4-bit digital latch allow change channels? CS5525 CS5526 well CS5504 family ADC's designed settle conversion cycle. This means switched from channel-to-channel with every conversion while maintaining resolution accuracy. What determines input span converter? Performing full scale gain calibration, modifying reference voltage. example, reference voltage reduced default input ranges scale half. Example: Vref Vref 1.25 12.5 does output word rate affect ADC's bandwidth? input bandwidth limited selected output word rate Nyquist theory sampling. Example: With default output word rate available signal bandwidth What recommended need more less bandwidth than provided on-chip digital filter? external clock between scale digital filters corner frequency accordingly. Example: Using clock 3x32.768 word rate 3.76 11.28
PI246PP1
CS5529
FAQs
fast converter shift data from serial port? MHz. does instrumentation amplifier's chopping frequency affect converter's input impedance input current? input impedance converter dynamic impedance depends whether instrumentation amplifier engaged not. lower ranges mV), instrumentation amplifier engaged setting input impedance 1/fC (where chopping frequency, either 32,768). typical input impedance lower ranges 1900 (with 256, pF). higher ranges amplifier bypassed leaving equivalent input impedance 1/fC where either 32,768. typical input impedance higher ranges (with pF). input current dynamic current also depends whether instrumentation amplifier engaged not. lower ranges 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.
PI246PP1
CS5529
FAQs
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.
PI246PP1
CS5529
FAQs
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)]. 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.
PI246PP1
CS5529
FAQs
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 WR2WR0 bits configuration register. Since higher word rates result conversion words with more peak-to-peak 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.
PI246PP1
CS5529
FAQs
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. 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.
PI246PP1
CS5529
FAQs
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 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.
PI246PP1
CS5529
Ordering Information Ordering Information
CS5529-AP CS5529-AS -40°C +85°C -40°C +85°C 20-pin PDIP 20-pin SSOP
have questions, please contact undersigned phone email. Also, visit website "www.crystal.com" call literature department (800) 888-5016 ext. 3594 (512) 912-3594 data sheets application notes.
PI246PP1
CS5529
Ordering Information
PI246PP1
CS5529
Ordering Information
PI246PP1
Sales Office Applications Support
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ABOVE CONTACT INFORMATION LAST UPDATED 10/16/97
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16-Bit, Programmable with 6-Bit Latch following information based

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