{"id":2442,"date":"2026-05-20T04:47:46","date_gmt":"2026-05-20T04:47:46","guid":{"rendered":"https:\/\/materialparts.com\/ad5421brez\/"},"modified":"2026-05-20T04:47:46","modified_gmt":"2026-05-20T04:47:46","slug":"ad5421brez","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ad5421brez\/","title":{"rendered":"AD5421BREZ"},"content":{"rendered":"

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

The AD5421BREZ from Analog Devices is a 16-bit, loop-powered, 4mA to 20mA digital-to-analog converter (DAC) designed for industrial process control and smart transmitter applications. It features 0.05% maximum total unadjusted error, integrated voltage regulator output, on-chip voltage references, HART compatibility, and SPI interface up to 30MHz, in a 28-lead TSSOP package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u5236\u9020\u5546<\/td>\n\u6a21\u62df\u5668\u4ef6\u516c\u53f8<\/td>\n<\/tr>\n
Resolution<\/td>\n16-bit<\/td>\n<\/tr>\n
Output Range<\/td>\n4-20mA \/ 3.8-21mA \/ 3.2-24mA<\/td>\n<\/tr>\n
Total Unadjusted Error<\/td>\n0.05% max (B\/C grade)<\/td>\n<\/tr>\n
INL Error<\/td>\n0.0035% FSR max<\/td>\n<\/tr>\n
Loop Voltage Range<\/td>\n5.5V to 52V<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n300uA max<\/td>\n<\/tr>\n
Interface<\/td>\nSPI-compatible (30MHz)<\/td>\n<\/tr>\n
Regulated Output<\/td>\n1.8V to 12V<\/td>\n<\/tr>\n
On-Chip References<\/td>\n1.22V and 2.5V<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n28-TSSOP w\/ EP<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +105\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 16-bit resolution and monotonicity guaranteed<\/li>\n
  • Pin-selectable NAMUR-compliant output ranges<\/li>\n
  • Integrated regulated voltage output (1.8V to 12V)<\/li>\n
  • On-chip 1.22V and 2.5V reference voltages<\/li>\n
  • HART FSK protocol compatible<\/li>\n
  • High-speed SPI interface up to 30MHz<\/li>\n
  • Slew rate control function<\/li>\n
  • On-chip fault alerts via FAULT pin or alarm current<\/li>\n
  • Gain and offset adjustment registers<\/li>\n
  • Output temperature coefficient: 3ppm\/\u00b0C typical<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial process control 4-20mA loop-powered transmitters<\/li>\n
    • Smart transmitters with HART communication<\/li>\n
    • Factory automation and instrumentation<\/li>\n
    • Building automation systems<\/li>\n
    • Field instruments with digital communication<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The AD5421BREZ from Analog Devices is a 16-bit, loop-powered, 4mA to 20mA digital-to-analog converter (DAC) designed for industrial process control and smart transmitter applications. It features 0.05% maximum total unadjusted error, integrated voltage regulator output, on-chip voltage references, HART compatibility, and SPI interface up to 30MHz, in a 28-lead TSSOP package. Key Specifications […]<\/p>\n","protected":false},"author":2,"featured_media":2864,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[165],"class_list":["post-2442","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-adi"],"acf":{"brief_explanation":"16-bit loop-powered 4-20mA DAC, 0.05% TUE, SPI 30MHz, HART compatible, 28-TSSOP","date_code":"","package_case":"28-TSSOP w\/ Exposed Pad (4.4 x 9.7 mm)","in_stock":3210,"datasheet":"https:\/\/www.analog.com\/en\/products\/ad5421.html","price":"$6.87 @ 1ku","product_introduction":"The Analog Devices AD5421BREZ is a complete, loop-powered, 4mA to 20mA digital-to-analog converter designed for smart transmitter manufacturers in the industrial control industry. It provides a high-precision, fully integrated, low-cost solution in a compact 28-lead TSSOP package. The AD5421 includes a regulated voltage output that powers itself and other transmitter devices, providing 1.8V to 12V regulated output. Built-in 1.22V and 2.5V references eliminate the need for discrete regulators and voltage references. The device supports HART FSK protocol communication without performance degradation. The SPI-compatible serial interface operates at up to 30MHz for fast data transfers. With 0.0015% typical INL and 0.0006% typical gain error, the AD5421 delivers exceptional accuracy for demanding process control applications.","working_principle":"The AD5421 operates as a loop-powered DAC with four key subsystems: 1) 16-Bit DAC Core: The R-2R ladder network converts the digital input code into an analog current that drives the loop output through a precision output amplifier. The DAC guarantees 16-bit monotonicity with INL of 0.0035% FSR maximum (B\/C grade). 2) Voltage Regulator: An integrated regulator provides 1.8V to 12V output from the loop supply, powering the AD5421 and external circuitry. The regulated output is selectable via REG_SEL pins. 3) Reference System: On-chip 1.22V and 2.5V bandgap references with 4ppm\/\u00b0C maximum temperature coefficient ensure stable output accuracy. An external reference can also be used for higher precision. 4) Loop Interface: The device connects in series with the 4-20mA current loop, regulating the loop current based on the DAC code. The slew rate control function limits the rate of loop current change, and NAMUR-compliant alarm currents provide fault indication.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>REGOUT<\/td>Output<\/td>Regulated voltage output (1.8V to 12V)<\/td><\/tr>
      2<\/td>REGIN<\/td>Power<\/td>Regulator input from loop supply<\/td><\/tr>
      3-4<\/td>LOOP-<\/td>Power<\/td>Loop return connection<\/td><\/tr>
      5<\/td>VLOOP<\/td>Input<\/td>Loop voltage monitor input<\/td><\/tr>
      6<\/td>REFOUT1<\/td>Output<\/td>1.22V reference output<\/td><\/tr>
      7<\/td>REFOUT2<\/td>Output<\/td>2.5V reference output<\/td><\/tr>
      8<\/td>REFIN<\/td>Input<\/td>External reference input<\/td><\/tr>
      9<\/td>CINR<\/td>Capacitor<\/td>Internal reference filter capacitor<\/td><\/tr>
      10<\/td>EXT1<\/td>Input<\/td>External NMOS gate drive<\/td><\/tr>
      11<\/td>EXT2<\/td>Input<\/td>External NMOS source connection<\/td><\/tr>
      12-13<\/td>RANGE0\/RANGE1<\/td>Input<\/td>Output current range select<\/td><\/tr>
      14<\/td>FAULT<\/td>Output<\/td>Fault status output (active low)<\/td><\/tr>
      15<\/td>ALARM_CURRENT_DIR<\/td>Input<\/td>Alarm current direction select<\/td><\/tr>
      16<\/td>LDAC<\/td>Input<\/td>Load DAC (active low)<\/td><\/tr>
      17<\/td>SYNC<\/td>Input<\/td>SPI frame synchronization (active low)<\/td><\/tr>
      18<\/td>SCLK<\/td>Input<\/td>SPI serial clock input<\/td><\/tr>
      19<\/td>SDIN<\/td>Input<\/td>SPI serial data input<\/td><\/tr>
      20<\/td>SDO<\/td>Output<\/td>SPI serial data output<\/td><\/tr>
      21-23<\/td>REG_SEL0-2<\/td>Input<\/td>Regulated output voltage select<\/td><\/tr>
      24<\/td>RSET<\/td>Input<\/td>External RSET connection (24kOhm)<\/td><\/tr>
      25<\/td>DVDD<\/td>Power<\/td>Digital supply (1.71V to 5.5V)<\/td><\/tr>
      26<\/td>DDIO<\/td>Power<\/td>Digital I\/O supply<\/td><\/tr>
      27<\/td>COM<\/td>Ground<\/td>Common ground<\/td><\/tr>
      28<\/td>REGOUT<\/td>Output<\/td>Regulated voltage output (connected to pin 1)<\/td><\/tr><\/table>","application_scenarios":"
      • 4-20mA loop-powered smart transmitters in industrial process control<\/li>
      • HART-enabled field instruments with digital communication overlay<\/li>
      • Factory automation and distributed control system analog output modules<\/li>
      • Building automation HVAC and environmental monitoring transmitters<\/li>
      • Petrochemical and oil\/gas field instrumentation<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        ADI<\/td>AD5421BCPZ-REEL7<\/td>32-LFCSP (5x5mm)<\/td>Same function, LFCSP package<\/td><\/tr>
        ADI<\/td>AD421BRZ<\/td>28-TSSOP<\/td>16-bit, 4-20mA loop-powered DAC<\/td><\/tr>
        TI<\/td>DAC8750IPW<\/td>20-TSSOP<\/td>16-bit, 4-20mA loop-powered DAC<\/td><\/tr>
        ADI<\/td>AD5422BCPZ-REEL7<\/td>40-LFCSP<\/td>16-bit, voltage\/current output DAC<\/td><\/tr>
        ADI<\/td>AD5410ACPZ-REEL7<\/td>24-LFCSP<\/td>12\/16-bit, loop-powered DAC<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/2442","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=2442"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/2442\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media\/2864"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=2442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=2442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=2442"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=2442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}