8-Channel, 24-Bit Multi-Range following information based technic
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CS5522/24/28
8-Channel, 24-Bit Multi-Range
following information based technical datasheet:
CS5522/24/28 DS265PP1 Please contact Cirrus Logic Crystal Semiconductor Products Division further information.
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Copyright Cirrus Logic, Inc. 1998 (All Rights Reserved)
PI265PP1
CS5522/24/28
Features
8-Channel, 24-Bit Multi-Range
Features
Delta-Sigma Converter
Linearity Error: 0.0007%FS Noise Free Resolution: 18-bits Bipolar/Unipolar Input Ranges Chopper Stabilized Instrumentation Amplifier
On-Chip Charge Pump Drive Circuitry Multiplexer Conversion Data FIFO 2-Bit Output Latch Simple three-wire serial interface
SPIand MicrowireCompatible Schmitt Trigger Serial Clock (SCLK) Output Settles Conversion Cycle
50/60 Simultaneous Rejection Voltage Reference Input Capability System Self-Calibration with Registers
Channel Single Analog Supply +3.0 Digital Supply Programmable Channel Sequencer Power Mode Consumption:
PI265PP1
CS5522/24/28
Description Description
24-bit CS5522/24/28 highly integrated converters which include instrumentation amplifier, (programmable gain amplifier), multi-channel multiplexer, digital filters, self system calibration circuitry. chips designed provide their negative supply which enables 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 3.76 when operating from crystal. CS5522/24/28 capable producing output update rates with clock. filters designed settle full accuracy selected output update rate within conversion cycle. When operated word rates less, digital filters 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.
AIN1+ AIN1AIN2+ AIN2-
AGND
VREF+ VREFDifferential Order Modulator
DGND Digital Filter
CS5522 shown
Programmable Gain
Calibration Register Control Register Output Register
SCLK
Latch
Calibration Memory
Calibration
Clock Gen.
XOUT
PI265PP1
CS5522/24/28
Overview Overview
CS5522/24/28 24-bit converters which include chopper-stabilized instrumentation amplifier input, on-chip programmable gain amplifier. They optimized measuring low-level unipolar bipolar signals process control medical applications. CS5522/24/28 also include fourth order delta-sigma modulator, calibration microcontroller, eight digital filters used select between eight output update rates, 2-bit analog latch, multiplexer, serial port. CS5522/24/28 include (Charge Pump Drive) output which provides negative bias voltage on-chip instrumentation amplifier when used with combination external diodes capacitors. This makes converters ideal thermocouple temperature measurements because biasing scheme enables CS5522/24/28 measure negative voltages with respect ground without need negative supply.
PI265PP1
CS5522/24/28
FAQs FAQs
have multi-channel channel version CS5525/26? Yes, CS5522 2-channel version, CS5524 4-channel version, CS5528 8-channel version CS5525/26. These parts also have 2-bit output latch which used control either switches multiplexer through ADC's serial port. This latch eliminates need extra port system micro-controller reduces opto-isolator count isolated applications. many conversion cycles does take converter settle full scale step input? CS5522/24/25/26/28/29 well CS5504 family converters designed settle conversion cycle. This makes converters ideally suited various input level multiplexer applications converters switched from channel channel with every conversion while maintaining resolution accuracy. What determines input span converter? CS5522/24/28 provide default input ranges. With 2.5V reference default ranges converter also offers system gain calibration which used full scale input. Each range exceeded approximately percent. reference voltage also used modify input range. example, reference voltage reduced percent default input ranges scale half. Example: VREF VREF 1.25 12.5 VREF
PI265PP1
CS5522/24/28
FAQs
does output word rate affect ADC's bandwidth? Nyquist criterion, input bandwidth limited selected output word rate. example with default output word rate selected available input signal bandwidth converter What recommended need more less bandwidth than provided on-chip digital filter? external clock between scale digital filters corner frequency. using higher rate clock filter's corner frequency scales linearly with clock rate. example, using clock, default rate scales approximatey input bandwidth increases approximately 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 1000 (with 256, pF). higher ranges amplifier bypassed leaving equivalent input impedance 1/fC where either 1024 4096 32,768 typical input impedance higher ranges (with pF). input current dynamic current also depends whether
PI265PP1
CS5522/24/28
FAQs
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 VREF+ VREF- pins. zero, converter will compute zeros because digital output word represents ratio input signal voltage reference. calibration required converter? When converter 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.
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 converter? obtain optimum calibration accuracy, calibration should performed
PI265PP1
CS5522/24/28
FAQs
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 every input channel CS5522/24/28 (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 2-22). decimal equivalent meaning gain register bMSB21+ (b020 b12-1 b22-2 bN2-N) where binary numbers have value either zero one. 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
PI265PP1
CS5522/24/28
FAQs
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 register's content change when converter calibrated several times? What done prevent this? converter 24-bit ADCs 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 micro-controller stored EEPROM. These same calibration words then uploaded into offset gain registers converter when power re-applied system, when gain range changed.
PI265PP1
CS5522/24/28
FAQs
What advantage performing calibrations lower output word rates? Calibrations performed output word rate selected WR2-WR0 bits. 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.
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.
does serial port CS5522/24/28 differ from CS5525/ 26/29? CS5522/24/28 contain same 3-wire interface (SPIand Microwirecompatible), unlike CS5525/26 CS5522/24/28 contain programmable channel sequencer conversion data FIFO. sequencer used program sequence number times particular channel converted FIFO used store that sequence conversions until conversions loaded micro-controller later time.
PI265PP1
CS5522/24/28
FAQs
What benefit does evaluation board offer? CDB5522/24/28 evaluation board saves time money over prototyping. preassembled board comes equipped with 80C51 micro-controller 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.
PI265PP1
CS5522/24/28
Ordering Information Ordering Information
Model Number CS5522-AP CS5522-AS CS5524-AP CS5524-AS CS5528-AP CS5528-AS Linearity Error (Max) ±0.0015% ±0.0015% ±0.0015% ±0.0015% ±0.0015% ±0.0015% Temperature Range -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C Package 20-pin 0.3" Skinny Plastic 20-pin 0.2" Plastic SSOP 24-pin 0.3" Skinny Plastic 24-pin 0.2" Plastic SSOP 24-pin 0.3" Skinny Plastic 24-pin 0.2" Plastic 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.
PI265PP1
CS5522/24/28
Ordering Information
PI265PP1
Sales Office Applications Support
UNITED STATES Western Area Cirrus Logic, Inc. 3100 West Warren Ave. Fremont, 94538 510-623-8300 FAX: 510-252-6020
Southern California, Sales Westlake Village Townsgate Executive Bldg. 2659 Townsgate Road, Suite Westlake Village, 91361 805-371-5860 805-371-5861 Cirrus Logic, Inc. 6650 S.W. Redwood Lane, Ste. 105, First Floor Bldg. Portland, Oregon 97224 503-620-5547 FAX: 503-620-5665
EUROPE
Cirrus Logic International SARL Immeuble Andre Malraux Rome F-93561 Rosny-sous-Bois CEDEX, France +33148122812 FAX: +33148122810 Cirrus Logic Angler's Court Spittal Marrlow Bucks, England +44(0)1628 FAX: +44(0)1628 Cirrus Logic GmbH Muehlfelder-Strasse D-82211 Herrsching, Germany +49815292460 FAX: +498152924699
Korea Cirrus Logic, Korea Co., Ltd. 1302 SangKyung Bldg., 824-21 YeokSam-Dong, Kang Nam-Ku, Seoul, Korea +82(2)565-8561 FAX: +82(2)565-8565 Singapore Cirrus Logic 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(22)718-4533 FAX: +886(22)718-4526
Central Area Cirrus Logic, Inc. 14205 Burnet Rd., Ste. Austin, 78728 512-255-8893 FAX: 512-255-0733 Sotheastern Area Cirrus Logic, Inc. 5511 Capital Center Dr., Ste. Raleigh, 27606 919-859-5210 FAX: 919-859-5334 Northeastern Area Cirrus Logic, Inc. England Business Center, Ste. Andover, 01810 978-794-9992 FAX: 978-794-9998
Cirrus Logic, Inc. 10440 Little Patuxent Pkwy., Ste. Columbia, 21044-3559 410-740-5654 FAX: 410-740-6961
EAST 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 JAPAN
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
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