{"id":6449,"date":"2026-06-16T03:48:41","date_gmt":"2026-06-16T03:48:41","guid":{"rendered":"https:\/\/materialparts.com\/ad8429arz\/"},"modified":"2026-06-16T03:48:41","modified_gmt":"2026-06-16T03:48:41","slug":"ad8429arz","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ad8429arz\/","title":{"rendered":"AD8429ARZ"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The AD8429ARZ is an ultralow noise instrumentation amplifier from Analog Devices with 1nV\/\u221aHz input noise density \u2014 among the lowest available in any in-amp. With 90dB minimum CMRR at G=1, 15MHz bandwidth, 22V\/\u00b5s slew rate, and gain programmable from 1 to 10,000 via a single resistor, it excels in measuring extremely small signals. The B-grade offers 50\u00b5V max input offset and 0.02% gain accuracy. Supplied in 8-pin SOIC for \u221240\u00b0C to +125\u00b0C operation.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Input Voltage Noise<\/td>\n1 nV\/\u221aHz @ 1kHz<\/td>\n<\/tr>\n
Output Voltage Noise<\/td>\n45 nV\/\u221aHz @ 1kHz<\/td>\n<\/tr>\n
Current Noise<\/td>\n1.5 pA\/\u221aHz @ 1kHz<\/td>\n<\/tr>\n
CMRR (DC, G=1)<\/td>\n80\/90 dB (A\/B grade min)<\/td>\n<\/tr>\n
CMRR (5kHz, G=1)<\/td>\n76\/80 dB (A\/B grade min)<\/td>\n<\/tr>\n
\u8f93\u5165\u5931\u8c03\u7535\u538b<\/td>\n150\/50 \u00b5V (A\/B grade max)<\/td>\n<\/tr>\n
Bandwidth (G=1)<\/td>\n15 MHz<\/td>\n<\/tr>\n
Bandwidth (G=100)<\/td>\n1.2 MHz<\/td>\n<\/tr>\n
\u538b\u6446\u7387<\/td>\n22 V\/\u00b5s<\/td>\n<\/tr>\n
Gain Range<\/td>\n1 to 10,000 (single resistor)<\/td>\n<\/tr>\n
Gain Error (G=1)<\/td>\n0.05\/0.02% (A\/B grade max)<\/td>\n<\/tr>\n
THD (1kHz, G=1)<\/td>\n-130 dBc<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n\u00b14V to \u00b118V<\/td>\n<\/tr>\n
Supply Current<\/td>\n6.7 mA (typical)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n8-SOIC (3.9 x 4.9mm)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Industry-leading 1 nV\/\u221aHz input voltage noise<\/li>\n
  • 90 dB minimum CMRR at G=1 (B grade)<\/li>\n
  • 15 MHz bandwidth at G=1, 1.2 MHz at G=100<\/li>\n
  • Gain set with single external resistor: G = 1 + (6k\u03a9\/RG)<\/li>\n
  • -130 dBc THD at 1kHz for pristine signal quality<\/li>\n
  • 22 V\/\u00b5s slew rate for fast signal acquisition<\/li>\n
  • \u00b14V to \u00b118V dual supply operation<\/li>\n
  • Reference pin for output level shifting<\/li>\n
  • Extended temperature range: \u221240\u00b0C to +125\u00b0C<\/li>\n
  • Pin-compatible with AD8229, AD8421, AD8221<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Medical instrumentation (EEG, ECG front-ends)<\/li>\n
    • Precision data acquisition systems<\/li>\n
    • Microphone preamplification<\/li>\n
    • Vibration analysis and accelerometer conditioning<\/li>\n
    • Geophone and seismic signal conditioning<\/li>\n
    • Low-level sensor amplification<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The AD8429ARZ is an ultralow noise instrumentation amplifier from Analog Devices with 1nV\/\u221aHz input noise density \u2014 among the lowest available in any in-amp. With 90dB minimum CMRR at G=1, 15MHz bandwidth, 22V\/\u00b5s slew rate, and gain programmable from 1 to 10,000 via a single resistor, it excels in measuring extremely small signals. […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[165],"class_list":["post-6449","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-adi"],"acf":{"brief_explanation":"1nV\/\u221aHz ultra-low noise in-amp, 90dB CMRR, 15MHz BW, G=1-10000, \u00b14-18V, 8-SOIC","date_code":"","package_case":"8-SOIC (3.9 x 4.9 x 1.5mm)","in_stock":2555,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/ad8429.pdf","price":"$6.68 @ 1ku","product_introduction":"The AD8429ARZ is the industry's lowest-noise instrumentation amplifier from Analog Devices, achieving just 1 nV\/\u221aHz input voltage noise density \u2014 making it uniquely suited for amplifying microvolt-level signals in noisy environments. The current-feedback architecture provides high bandwidth at high gain (1.2 MHz at G=100), while maintaining 90 dB minimum CMRR at G=1. Gain is set from 1 to 10,000 with a single external resistor using the formula G = 1 + (6k\u03a9\/RG). The device delivers -130 dBc THD at 1kHz, 22 V\/\u00b5s slew rate, and 0.75\u00b5s settling to 0.01%. The reference pin allows output level shifting for single-supply signal chains. The 8-pin SOIC package and -40\u00b0C to +125\u00b0C operating range suit demanding industrial and medical environments.","working_principle":"The AD8429 uses a three-op-amp instrumentation amplifier architecture with a current-feedback input stage. The input stage consists of two matched transconductance amplifiers that convert the differential input voltage to internal current signals. The gain resistor RG determines how much feedback current flows between the two input buffers; a smaller RG increases the feedback current, increasing gain per G = 1 + (6k\u03a9\/RG). The output stage is a difference amplifier that converts the single-ended current signals to a voltage output referenced to the REF pin. The current-feedback topology provides bandwidth that decreases slowly with gain (15 MHz at G=1, 1.2 MHz at G=100), unlike voltage-feedback designs where bandwidth drops proportionally. The input protection circuitry improves settling after large common-mode or differential transients, crucial for multiplexed data acquisition.","pin_description":"
      Pin<\/th>Name<\/th>Description<\/th><\/tr>
      1<\/td>-IN<\/td>Inverting input<\/td><\/tr>
      2<\/td>RG<\/td>Gain resistor terminal 1<\/td><\/tr>
      3<\/td>RG<\/td>Gain resistor terminal 2<\/td><\/tr>
      4<\/td>+IN<\/td>Non-inverting input<\/td><\/tr>
      5<\/td>-VS<\/td>Negative supply voltage<\/td><\/tr>
      6<\/td>REF<\/td>Reference (output offset) input<\/td><\/tr>
      7<\/td>VOUT<\/td>Amplifier output<\/td><\/tr>
      8<\/td>+VS<\/td>Positive supply voltage<\/td><\/tr><\/table>","application_scenarios":"
      • Vibration Analysis Front-End:<\/b> Connect a piezoelectric accelerometer to the AD8429 with G=1000. The 1 nV\/\u221aHz input noise yields a noise floor of ~1.4 nV\/\u221aHz RTI, detecting vibration signals below 0.1 \u00b5g\/\u221aHz. The 80 dB CMRR at 5kHz rejects electromagnetic interference from nearby motor drives. The -130 dBc THD preserves spectral purity for FFT-based vibration analysis.<\/li>
      • EEG\/ECG Medical Instrumentation:<\/b> Amplify biopotential signals (10\u00b5V to 5mV) with G=1000. The ultra-low 100 nV p-p noise (0.1-10Hz at G=1000) reveals subtle ECG P-waves and EEG alpha rhythms. The REF pin shifts the output to mid-supply for single-supply ADC interfacing. The 90 dB CMRR rejects 50\/60Hz common-mode interference from power lines.<\/li>
      • Geophone Signal Conditioning:<\/b> Condition low-frequency geophone outputs in seismic monitoring. The 1 nV\/\u221aHz noise at 1kHz extends to low frequencies with only 2 \u00b5V p-p noise (0.1-10Hz at G=1), revealing micro-seismic events. The \u00b118V supply range accommodates the large dynamic range of seismic signals.<\/li><\/ul>","alternative_models":"
        Model<\/th>Voltage Noise<\/th>CMRR (G=1)<\/th>BW (G=1)<\/th>Key Difference<\/th><\/tr>
        AD8429BRZ<\/td>1 nV\/\u221aHz<\/td>90 dB min<\/td>15 MHz<\/td>B-grade, tighter specs<\/td><\/tr>
        AD8229BRZ<\/td>1 nV\/\u221aHz<\/td>80 dB min<\/td>15 MHz<\/td>Previous gen, lower CMRR<\/td><\/tr>
        INA103<\/td>1 nV\/\u221aHz<\/td>80 dB min<\/td>5 MHz<\/td>TI\/Burr-Brown, lower BW<\/td><\/tr>
        AD8421BRZ<\/td>3.2 nV\/\u221aHz<\/td>94 dB min<\/td>10 MHz<\/td>Higher CMRR, higher noise<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6449","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=6449"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6449\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6449"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}