DAC161S997 16-Bit SPI-Programmable DAC for 4-20 mA Loops
1 Features
- 16-Bit Resolution
- Very-Low Supply Current of 100 µA
- 5 ppmFS/°C Gain Error
- Pin-Programmable Power-Up Condition
- Loop-Error Detection and Reporting
- Programmable Output-Current Error Levels
- Simple HART Modulator Interfacing
- Highly Integrated Feature Set in Small Footprint WQFN-16 (4- × 4-mm, 0.5-mm Pitch)
2 Applications
3 Description
The DAC161S997 is a very low power 16-bit ΣΔ digital-to-analog converter (DAC) for transmitting an analog output current over an industry standard 4-20 mA current loop. The DAC161S997 has a simple 4-wire SPI for data transfer and configuration of the DAC functions. To reduce power and component count in compact loop-powered applications, the DAC161S997 contains an internal ultra-low power voltage reference and an internal oscillator. The low power consumption of the DAC161S997 results in additional current being available for the remaining portion of the system. The loop drive of the DAC161S997 interfaces to a Highway Addressable Remote Transducer (HART) modulator, allowing injection of FSK modulated digital data into the 4-20 mA current loop. This combination of specifications and features makes the DAC161S997 ideal for 2- and 4-wire industrial transmitters. The DAC161S997 is available in a 16-pin 4-mm × 4-mm WQFN package and is specified over the extended industrial temperature range of –40°C to +105°C.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| DAC161S997 | WQFN (16) | 4.00 mm x 4.00 mm |
- For all available packages, see the orderable addendum at the end of the datasheet.
4 Simplified Schematic
5 Revision History
Changes from * Revision ( June 2013) to A Revision
- Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
6 Pin Configuration and Functions
Pin Functions
| PIN | TYPE(1) | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| BASE | 16 | A | External NPN base drive |
| COMA | 1 | P | Analog-block negative supply rail (local COMMON) |
| COMD | 2 | P | Digital-block negative supply rail (local COMMON) |
| CSB | 6 | I | SPI chip select |
| C1 | 14 | A | External capacitor |
| C2 | 13 | A | External capacitor, HART input |
| C3 | 12 | A | External capacitor |
| EERB | 7 | O | Error flag output, open drain, active LOW |
| ERRLVL | 10 | I | Sets output-current level at power up and under-error conditions. |
| NC | 11 | – | Do not connect to this pin. |
| OUT | 9 | A | Loop output current source output |
| SCLK | 4 | I | SPI clock input |
| SDI | 5 | I | SPI data input |
| SDO | 8 | O | SPI data output |
| VA | 15 | P | Analog-block positive supply rail |
| VD | 3 | P | Digital-block positive supply rail. |
| DAP | DAP | P | Die attach pad. Connect directly to local COMMON (COMA, COMD). |
