The AD5421 is a complete, loop-powered, 4 mA to 20 mA digital-to-analog converter (DAC) designed to meet the needs of smart transmitter manufacturers in the industrial control industry. The DAC provides a high precision, fully integrated, low cost solution in a compact TSSOP package and LFCSP packages. Applications
The AD5421 includes a regulated voltage output that is used to power itself and other devices in the transmitter. This regulator provides a regulated 1.8 V to 12 V output voltage. The AD5421 also contains 1.22 V and 2.5 V references, thus eliminating the need for a discrete regulator and voltage reference.
The AD5421 can be used with standard HART® FSK protocol communication circuitry without any degradation in specified performance. The high speed serial interface is capable of opera-ting at 30 MHz and allows for simple connection to commonly used microprocessors and microcontrollers via a SPI-compatible, 3-wire interface.
The AD5421 is guaranteed monotonic to 16 bits. It provides 0.0015% integral nonlinearity, 0.0012% offset error, and 0.0006% gain error under typical conditions.
The AD5421 is available in a 28-lead TSSOP and a 32-lead LFCSP specified over the extended industrial temperature range of −40°C to +105°C.
Features and Benefits-- 4 mA to 20 mA -- 3.8 mA to 21 mA -- 3.2 mA to 24 mA 3.2 mA 22.8mA/24mA | Interface & IsolationDigital to Analog ConvertersAD5421 IBIS Model
Reference Designs |
| Document | note |
| AD5421: 16-Bit, Serial Input, Loop-Powered, 4 mA to 20 mA DAC Data Sheet (Rev. H) | PDF 3039 kB |
| Document | note |
| AN-534: Adding HART® Capability to the AD421, Loop-Powered 4 mA–20 mA DAC Using the 20C15 HART Modem (Rev. B) | PDF 49 kB |
| Document | note |
| UG-250: Evaluation Board for 16-Bit, Serial Input, Loop-Powered 4 mA to 20 mA DAC | PDF 540 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD5421ACPZ-REEL7 Production | 32 ld LFCSP (5x5x.85mm) w/3.5exposed pad | REEL 1500 | -40 to 105C | 0 | 4.85 | Y |
| AD5421BCPZ-REEL7 Production | 32 ld LFCSP (5x5x.85mm) w/3.5exposed pad | REEL 1500 | -40 to 105C | 0 | 6.5 | Y |
| AD5421BREZ Production | 28 ld TSSOP-EP(EP=3x5.5mm) | OTH 50 | -40 to 105C | 6.55 | 5.55 | Y |
| AD5421BREZ-REEL Production | 28 ld TSSOP-EP(EP=3x5.5mm) | REEL 2500 | -40 to 105C | 0 | 5.55 | Y |
| AD5421BREZ-REEL7 Production | 28 ld TSSOP-EP(EP=3x5.5mm) | REEL 1000 | -40 to 105C | 0 | 5.55 | Y |
| AD5421CREZ Production | 28 ld TSSOP-EP(EP=3x5.5mm) | OTH 50 | -40 to 105C | 8.79 | 6.6 | Y |
| AD5421CREZ-RL Production | 28 ld TSSOP-EP(EP=3x5.5mm) | REEL 2500 | -40 to 105C | 0 | 6.6 | Y |
| AD5421CREZ-RL7 Production | 28 ld TSSOP-EP(EP=3x5.5mm) | REEL 1000 | -40 to 105C | 0 | 6.6 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| EVAL-AD5421SDZ | Evaluation Board | 59 | Y |
| EVAL-SDP-CB1Z | Evaluation Board | 99 | Y |
