16-Bit/20-Bit Multi-Range with 4-Bit Latch following information

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16-Bit/20-Bit Multi-Range with 4-Bit Latch following information

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CS5525 CS5526
16-Bit/20-Bit Multi-Range with 4-Bit Latch
following information based technical datasheet:
DS202PP5 Please contact Cirrus Logic: Crystal Semiconductor Products Division further product information.
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Copyright Cirrus Logic, Inc. 1998 (All Rights Reserved)
PI202PP3
CS5525 CS5526
Features
16/20-Bit Multi-Range 4-Bit Latch
Features
Delta-Sigma Converter
Linearity Error: 0.0015%FS Noise Free Resolution: 18-bits Bipolar/Unipolar Input Ranges Chopper Stabilized Instrumentation Amplifier
On-Chip Charge Pump Drive Circuitry 4-Bit Output Latch Simple three-wire serial interface
SPIand MicrowireCompatible Schmitt Trigger Serial Clock (SCLK) Programmable Output Word Rates 3.76 202Hz (XIN 32.768 kHz) 11.47 (XIN kHz) Output Settles Conversion Cycle
Simultaneous 50/60 Noise Rejection System Self-Calibration with
Read/Write Registers
Single Analog Supply
+3.0 Digital Supply
Power Mode Consumption:
Input Ranges
PI202PP3
CS5525 CS5526
Description Description
16-bit CS5525 20-bit CS5526 highly integrated converters which include instrumentation amplifier, (programmable gain amplifier), eight digital filters, self system calibration circuitry. converters designed provide their negative supply which allows their on-chip instrumentation amplifiers measure bipolar ground-referenced signals ±100 directly supplying with -2.5 with ±2.5 signals (with respect ground) measured. digital filters provide programmable output update rates between 3.76 (XIN 32.768 kHz). Output word rates increased approximately using kHz. Each filter designed settle full accuracy output update rate conversion cycle. filters with word rates less (XIN 32.768 kHz) reject both line interference simultaneously. power, single conversion settling time, programmable output rates, ability handle negative input signals make these single supply products ideal solutions isolated non-isolated applications.
AGND
VREF+ VREF-
DGND Digital Filter
AIN+ AINNBV
Programmable Gain
Differential Order Delta-Sigma Modulator
Calibration Register Control Register Output Register
SCLK
Latch
Calibration Memory
Calibration
Clock Gen.
XOUT
PI202PP3
CS5525 CS5526
Overview Overview
CS5525 CS5526 20-bit converters respectively, employing Delta-Sigma topology. They highly integrated with onchip chopper stabilized instrumentation amplifier, programmable gain amplifier, charge pump drive circuitry negative bias voltage input operating from single supply. simple programming structure 3-wire SPIand Microwirecompatible interface enables selectable output word rates, system/self-calibration with read/write registers ability control external portions application circuit on-chip 4-bit output latch.
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?
PI202PP3
CS5525 CS5526
FAQs
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 11.47 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+)-
PI202PP3
CS5525 CS5526
FAQs
(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
PI202PP3
CS5525 CS5526
FAQs
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)]. 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?
PI202PP3
CS5525 CS5526
FAQs
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.
PI202PP3
CS5525 CS5526
Ordering Information
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.
Ordering Information
CS5525-AP CS5526-BP CS5525-AS CS5526-BS -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C 20-pin PDIP 20-pin PDIP 20-pin SSOP 20-pin SSOP
further information Crystal products, please visit website "www.crystal.com" call literature department (800) 888-5016 ext. 3594 (512) 912-3594 data sheets application notes.
PI202PP3
Sales Office Applications Support
UNITED STATES Sales Office Applications Support: WESTERN AREA Cirrus Logic Crystal Semiconductor Div. Airport Pkwy. Jose, 95110 408-437-7743 FAX: 408-437-4943
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EUROPE Sales Office Applications Support:
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KOREA Cirrus Logic, Korea Co., Ltd. 1302 SangKyung Bldg., 82421 YeokSam-Dong, KangNam-Ku, Seoul, Korea +82(2)565-8561 FAX: +82(2)565-8565 SINGAPORE Cirrus Logic Crystal International Kaki Bukit Ave. Ste. 03-03 Singapore 417940 +65-743-4111 FAX: +65-742-4111 TAIWAN Cirrus Logic International Ltd. Taiwan Branch 10F, No.214 North Taipei, Taiwan R.O.C. +886(2)2718-4533 FAX: +886(2)2718-4526
CENTRAL AREA Cirrus Logic Crystal Semiconductor Div. 14205 Burnet Rd., Ste. Austin, 78728 512-255-8893 FAX: 512-255-0733 EASTERN AREA Cirrus Logic Crystal Semiconductor Div. 5511 Capital Center Dr., Ste. Raleigh, 27606 919-859-5393 FAX: 919-859-5334
Cirrus Logic England Business Center, Ste. Andover, 01810 978-794-9138 FAX: 978-794-9998 Cirrus Logic Crystal Semiconductor Div. 10440 Little Patuxent Pkwy., Ste. Columbia, 21044-3559 410-740-5654 FAX: 410-740-6961
JAPAN EAST Sales Office Applications Support: CHINA Cirrus Logic International Ltd. A-1403, Qiancun Commercial Mansion Beijing, China 100029 (8610)6443-0783 (8610)6443-0784 (8610)6443-0785 FAX: (8610)6443-0786 HONG KONG Cirrus Logic International Ltd. 1203 Park Tower Austin Rd., Tsimshatsui Kowloon, Hong Kong (852)2376-0801 FAX: (852)2375-1202 Sales Office Applications Support: Cirrus Logic K.K. Shinjuku Green Tower, Bldg. 6-14-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo, Japan +81(03)3340-9111 FAX: +81(03)3340-9120
CRYSTAL SEMICONDUCTOR PRODUCTS DIVISION 17847 4210 INDUSTRIAL DRIVE AUSTIN, TEXAS 78744 512.445.7222 800.888.5016 FAX: 512.445.7581 WORLDWIDE WEB: http://www.crystal.com

16-Bit/20-Bit Multi-Range with 4-Bit Latch following information

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