AD7829: difference between AD7829-1 and AD7829

Question Do you know the difference between AD7829-1 and AD7829? I can not find the exact difference. Answer AD7829-1 is an AD7829 redesign. Recommend AD7829-1 for new designs. The main differences between the old version and the new version: If the oscillator on the AD7829 is stalled (i.e. lock-up has occurred) and the user initiates a conversion (falling edge on /CONVST) the part will know that a lock-up has occurred. A further conversion will reset the oscillator. The third conversion will produce a valid result. The attached timing plot shows the sequence.

Are there any recommendations for applying VDD on AD7829 ?

Q Are there any recommendations for applying VDD on AD7829 ? A We recommend the following when using our AD7829 ADC: 1)When powering down the AD7829, we recommend that you do bring VDD all the way to 0V when powering down, before re-applying power (VDD) again. 2)CONVST can go high with VDD, the important thing to remember here is not to exceed VDD, we have tried both with CONVST connected to a pull-down resistor...(10K to gnd ) and with a pull-up resistor to VDD, both configurations are acceptable. Please ensure that you do not have a glitch on CONVST especially during power-up as this will try to power-up the part without VDD fully settled and cause the part to lock-up. The only way out of this situation is to power-down and power-back up again correctly. Unfortunately the above points, especially the first are not sufficiently highlighted in the datasheet.

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Products Mentioned

AD7829-1 Production
The AD7829-1 is a high speed 8-channel, microprocessor-compatible, 8-bit analog-to-digital converter with a maximum throughput of 2 MSPS. The AD7829-1...
Datasheet
AD7829-1 on Analog.com

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
+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
- Are there any recommendations for applying VDD on AD7829 ?
- AD7829: difference between AD7829-1 and AD7829
+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
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+AD7924: FAQ
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+AD7960: FAQ
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+AD797: FAQ
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+AD7986: FAQ
+AD7988-1: FAQ
+AD7993: FAQ
+AD7994: FAQ
+AD7997: FAQ
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+ADA2200: FAQ
+ADAS1000: FAQ
+ADAS3022: FAQ
+ADAS3023: FAQ
+ADC: FAQ
+ADVFC32: FAQ
+EVAL-AD7719-EB: FAQ
+EVAL-ADAS3022EDZ: FAQ
+RDC1740: FAQ
+AD4030-24: FAQ
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+AD4130-8 FAQ
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+AD4134 FAQ
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+AD4858
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AD73360: FAQ
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+AD73360L: FAQ
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+AD738x-4: FAQ
AD7398 SPI Voltage vs VCC
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+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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+MAX11131ATI+: FAQ
+MAX11136ATI+: FAQ
+MAX11150EVKIT#: FAQ
+MAX11154: FAQ
MAX11156: FAQ
+MAX11156ETC+: FAQ
+MAX11158: FAQ
+MAX11163: FAQ
+MAX11168EUB+: FAQ
+MAX11169EUB+: FAQ
+MAX11190: FAQ
+MAX11190ATE+: FAQ
MAX11192: FAQ
+MAX11192EVKIT#: FAQ
+MAX11200: FAQ
+MAX11200EEE+: FAQ
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MAX11210: FAQ
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+MAX11213EEE+T: FAQ
MAX11214: FAQ
MAX11214EUG+: FAQ
+MAX11214EUG+_T1: FAQ
+MAX11216: FAQ
+MAX11254ATJ+: FAQ
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+MAX11259AWX+T: FAQ
+MAX11259PMB#: FAQ
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+MAX11645EWC+T: FAQ
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+MAX11900: FAQ
MAX11905: FAQ
+MAX11905EVKIT#: FAQ
+MAX1202AEAP+: FAQ
+MAX1220: FAQ
+MAX1229: FAQ
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