AD2S83: Incremental output with low frequency excitation

Q we used AD2S83 before, now he hope our AD2Sxx have incremental encoder output, so he select AD2S90. But the frequency of his resolver's output signal is only 50 Hz. And AD2S90's input signal's frequency is 3 KHz minimum. So it seems AD2S90 isn't the correct choice, isn't it? Then which ADI's part can meet his requirement, that is, 50 Hz input signal, incremental encoder output? A You are right. The frequency low limit of AD2S90 device is 3 kHz which means the AD2S90 won’t work with the excitation frequency selected to 50 Hz. However if customer is looking for incremental encoder output with low excitation frequency signal we may suggest him simple solution based on the AD2S83 which he was using in the past. Please open link below: http://www.analog.com/static/imported-files/application_notes/5033918389419AN-26 5.pdf Chapter 5 of this PDF document explain how to modify the AD2S83 circuitry to create incremental encoder outputs. Basically what they need is one XOR gate, one inverter and two D type flip flops. Connection diagram is presented in the figure 6.

Q We have tried to get position from chip. It gives us quite strange output. While position sensor is static some bits of output toggles on/off quite randomly.Output is like 0x4040-> 0x8080 -> 0xC040 etc. Reference freq is 400 hz, sampling rate 100ms. Mode is 16-bit. sensor rotates in actual application quite slow. Do you have 'pseudo' code how to program parallel interface? Just to verife operation. Now we pull inhibit 500 uS low before pulling enable low and reading bits out. Complement & dataload is not used, should ? A Improved, layout, grounding, shielding and or filtering of the Resolver outputs may eliminate the problems. Do note that if you do use a filter on the resolver sine / cosine outputs, the filter should be well matched with corner frequency 2 or 3 decades higher than the excitation frequency. Otherwise the filter will introduce static errors. The AD2S83 uses synchronous demodulation and a tracking converter to null an error signal and produce the digital output. The part is ratiometric with the excitation (reference) signal in that the absolute amplitude of the excitation signal has little or no effect on accuracy. However, disturbances on the Sin and Cosine inputs will affect the demodulator and produce erroneous results. On the AD2S83 several 'Logic' inputs are referenced to the +Vs(+12V)supply. These are DATALOAD, SC1 and SC2. You need to tie DATALOAD and SC2 to +12V instead of +5V to achieve a logic HI. (These inputs have internal pull-up resistors, and could also be left floating.) We do not have any code. There is some background on using the AD2S83 in the applications note at : http://www.analog.com/media/en/technical-documentation/application-notes/1028882 32AN-236.pdf Note that the AD2S83 is an older (mature) IC. For new designs we are recommending the AD2S1200 which includes the oscillator circuitry on the chip.

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The AD2S83 is a monolithic 10-, 12-, 14-, or 16-bit tracking resolver-to-digital converter. The converter allows users to select their own resolution and...
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Table of Contents

+Documents
+General: FAQ
+AD1139: FAQ
+AD7091R Conversion Result Change
+AD1556: FAQ
+AD1580: FAQ
+AD1582: FAQ
+AD2S1200: FAQ
+AD2S1205: FAQ
+AD2S1210: FAQ
+AD2S75: FAQ
+AD2S80: FAQ
+AD2S80A: FAQ
+AD2S82A: FAQ
-AD2S83: FAQ
- AD2S83: Incremental output with low frequency excitation
- AD2S83
+AD2S90: FAQ
+AD2S99: FAQ
+AD4110-1: FAQ
+AD411x: FAQ
+AD5940: FAQ
+AD598: FAQ
+AD650: FAQ
+AD652: FAQ
+AD654: FAQ
+AD7091: FAQ
+AD7091R-X: FAQ
+AD711: FAQ
+AD7124-4: FAQ
+AD7124-8: FAQ
+AD7134: FAQ
+AD713: FAQ
+AD7142: FAQ
+AD7147: FAQ
+AD7148: FAQ
+AD7150: FAQ
+AD7151: FAQ
+AD7175-2: FAQ
+AD7176-2: FAQ
+AD7176: FAQ
+AD717x: FAQ
+AD7190: FAQ
+AD7192: FAQ
+AD7193: FAQ
+AD7195: FAQ
+AD719x: FAQ
+AD7265: FAQ
+AD7266: FAQ
+AD7280: FAQ
+AD7291: FAQ
+AD7298: FAQ
+AD7305: FAQ
+AD7321: FAQ
+AD7323: FAQ
+AD7328: FAQ
+AD7366-5: FAQ
+AD7367: FAQ
+AD736ARZ: FAQ
+AD737: FAQ
+AD738x : FAQ
+AD7398: FAQ
+AD7400A: FAQ
+AD7401: FAQ
+AD7403: FAQ
+AD74111: FAQ
+AD7415: FAQ
+AD7416: FAQ
+AD7417: FAQ
+AD7418: FAQ
+AD7450: FAQ
+AD7475: FAQ
+AD7484: FAQ
+AD7490: FAQ
+AD7492: FAQ
+AD75019: FAQ
+AD7503: FAQ
+AD7541A: FAQ
+AD7546: FAQ
AD7547: FAQ
+AD7568: FAQ
+AD7578: FAQ
+AD7606-4: FAQ
+AD7606: FAQ
+AD7606B: FAQ
+AD7606C: FAQ
+AD7608: FAQ
+AD7616 FAQ
+AD7616-P: FAQ
+AD7621: FAQ
+AD7625: FAQ
+AD7626: FAQ
+AD7631: FAQ
+AD7653: FAQ
+AD7654: FAQ
+AD7655: FAQ
+AD7656: FAQ
+AD7657-1: FAQ
+AD7663: FAQ
+AD7674: FAQ
+AD7675: FAQ
+AD7678: FAQ
+AD7682: FAQ
+AD7683: FAQ
+AD7684: FAQ
+AD7685: FAQ
+AD7688: FAQ
+AD7689: FAQ
+AD7690: FAQ
+AD7691: FAQ
+AD7705: FAQ
+AD7706: FAQ
+AD7707: FAQ
+AD7708: FAQ
+AD7709: FAQ
+AD7710: FAQ
+AD7711A: FAQ
+AD7712: FAQ
+AD7713: FAQ
+AD7714: FAQ
+AD7714YN: FAQ
+AD7715: FAQ
+AD7716: FAQ
+AD7718: FAQ
+AD7719: FAQ
+AD7720: FAQ
+AD7722: FAQ
+AD7725: FAQ
+AD7730: FAQ
+AD7731: FAQ
+AD7732: FAQ
+AD7738: FAQ
+AD7740: FAQ
+AD7741: FAQ
+AD7745: FAQ
+AD7746: FAQ
+AD7747: FAQ
+AD7760: FAQ
+AD7763: FAQ
+AD7766: FAQ
+AD7768: FAQ
+AD777x: FAQ
+AD7780: FAQ
+AD7785: FAQ
+AD7787: FAQ
+AD7788: FAQ
+AD7790: FAQ
+AD7792: FAQ
+AD7793: FAQ
+AD7794: FAQ
+AD7795: FAQ
+AD7798: FAQ
+AD7799: FAQ
+AD7805: FAQ
+AD7808: FAQ
+AD7809: FAQ
+AD780: FAQ
+AD7811: FAQ
+AD7812: FAQ
+AD7817: FAQ
+AD7819: FAQ
+AD7821: FAQ
+AD7825: FAQ
+AD7829: FAQ
+AD7835: FAQ
+AD7849: FAQ
+AD7851: FAQ
+AD7854: FAQ
+AD7856: FAQ
+AD7858: FAQ
+AD7859: FAQ
+AD7864: FAQ
+AD7865 : FAQ
+AD7872: FAQ
+AD7874: FAQ
+AD7879: FAQ
+AD7887: FAQ
+AD7888: FAQ
+AD7891-1: FAQ
+AD7891: FAQ
+AD7893-2: FAQ
+AD7895: FAQ
+AD7896: FAQ
+AD7899: FAQ
+AD7912: FAQ
+AD7921: FAQ
+AD7924: FAQ
+AD7927: FAQ
+AD7938: FAQ
+AD7942: FAQ
+AD7949: FAQ
+AD7960: FAQ
+AD7961: FAQ
+AD797: FAQ
+AD7980: FAQ
+AD7982: FAQ
+AD7984: FAQ
+AD7986: FAQ
+AD7988-1: FAQ
+AD7993: FAQ
+AD7994: FAQ
+AD7997: FAQ
+AD7998: FAQ
+ADA2200: FAQ
+ADAS1000: FAQ
+ADAS3022: FAQ
+ADAS3023: FAQ
+ADC: FAQ
+ADVFC32: FAQ
+EVAL-AD7719-EB: FAQ
+EVAL-ADAS3022EDZ: FAQ
+RDC1740: FAQ
+AD4030-24: FAQ
+AD4114: FAQ
+AD4116: FAQ
+AD4130-8 FAQ
+AD4131-8: FAQ
+AD4134 FAQ
+AD4170: FAQ
+AD4858
+AD674BBD: FAQ
+AD7172-2: FAQ
+AD7175-8: FAQ
+AD7191: FAQ
AD73360: FAQ
+AD73360AR: FAQ
+AD73360L: FAQ
+AD7357: FAQ
+AD7386-4: FAQ
+AD738x-4: FAQ
AD7398 SPI Voltage vs VCC
+AD7457: FAQ
+AD7606C-16: FAQ
+AD7609: FAQ
+AD7656-1: FAQ
AD7660: FAQ
+AD7665: FAQ
+AD7680: FAQ
+AD7686: FAQ
+AD7764: FAQ
+AD7778: FAQ
AD7892: FAQ
+AD7980SRMZ-EP: FAQ
+AD7991: FAQ
+AD9243: FAQ
+AD9260: FAQ
+AD9261: FAQ
+AD9262: FAQ
+AD974: FAQ
+AD976A: FAQ
+AD977A: FAQ
+ADAQ4003: FAQ
+ADAQ7768-1: FAQ
+ADAQ8092 FAQ
+DC590, DC2026, QuikEval: FAQs
+EVAL-AD7768-4FMCZ: FAQ
+Legacy LTC - Sigma Delta ADCs FAQ
+LTC2408: FAQ
+LTC2497: FAQ
+MAX1028: FAQ
+MAX1036: FAQ
+MAX1037EKA+: FAQ
+MAX11040GUU+: FAQ
+MAX11043: FAQ
+MAX11045: FAQ
+MAX11046 16-BIT AD: FAQ
+MAX11048: FAQ
+MAX11100EUB+: FAQ
+MAX11101: FAQ
+MAX11103: FAQ
+MAX11108: FAQ
MAX11125: FAQ
+MAX11125ATI+: FAQ
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+MAX11136ATI+: FAQ
+MAX11150EVKIT#: FAQ
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MAX11156: FAQ
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+MAX11168EUB+: FAQ
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+MAX11192EVKIT#: FAQ
+MAX11200: FAQ
+MAX11200EEE+: FAQ
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+MAX11214EUG+_T1: FAQ
+MAX11216: FAQ
+MAX11254ATJ+: FAQ
+MAX11254EVKIT#: FAQ
+MAX11259AWX+T: FAQ
+MAX11259PMB#: FAQ
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