Single-Channel, 16-Bit, Current/Voltage Output DAC, Functional Safety Approved for Unipolar Current Output

The ADFS5758 is a single-channel, 16-bit, current/voltage output DAC. The device is functional safety approved for unipolar current output and is a fully compliant item with a systematic capability of SC3, which can be used in safety-related applications up to SIL 2, according to IEC 61508. This arrangement allows a single ADFS5758 to be used to achieve SIL 2 for a nonredundant configuration. The safe state for the ADFS5758 is open circuit/high impedance.

The ADFS5758 is a single-channel, voltage and current output digital-to-analog converter (DAC) that operates with a power supply range from −33 V minimum on AVSS to +33 V maximum on AVDD1 with a maximum operating voltage between the two rails of 60 V. On-chip dynamic power control (DPC) minimizes package power dissipation, which is achieved by regulating the supply voltage (VDPC+) to the VIOUT output driver circuitry from 4.95 V to 27 V using a buck dc-to-dc converter, optimized for minimum on-chip power dissipation. The CHART pin enables a HART® signal to be coupled onto the current output.

The device uses a versatile 4-wire serial peripheral interface (SPI) that operates at clock rates of up to 50 MHz and is compatible with standard SPI, QSPI™, MICROWIRE™, DSP, and microcontroller interface standards. The interface also features an optional SPI cyclic redundancy check (CRC) and a windowed watchdog timer. The ADFS5758 offers improved diagnostic features from its predecessors, such as an integrated independent 12-bit diagnostic analog-to-digital converter (ADC) that can be used to digitize both internal and external nodes.

Product HighIights

* Functional safety approved to SIL 2/SC3 by TÜV Rheinland.

* Range of advanced diagnostic features, including an integrated ADC for high reliability.

* DPC using an integrated buck dc-to-dc converter for thermal management. When used with the ADP1031, the ADFS5758 enables eight channel to channel isolated outputs at <2 W dissipated power.

* Programmable power control (PPC) mode to enable faster settling time (15 µs typical).

* Highly robust with output protection from miswire events (±38 V).

Applications

* Process control

* Actuator control

* Channel isolated analog outputs

* Programmable logic controller (PLC) and distributed control system (DCS) applications

* HART network connectivity

* Functional safety approved to SIL 2/SC3 for unipolar current output by TÜV Rheinland, File Number 968/FSP 2055.00/20

* Current/voltage output available on a single terminal

* Current output ranges: 0 mA to 20 mA, 4 mA to 20 mA, 0 mA to 24 mA, ±20 mA, ±24 mA, −1 mA to +22 mA

* Voltage output ranges (with 20% overrange): 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V

* User-programmable offset and gain

* Advanced on-chip diagnostics

* 12-bit ADC functioning as an independent monitoring function that can validate the output and accuracy.

* On-chip reference