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Overview

Features and Benefits

  • 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
TÜV Rheinland
  • DPC for thermal management
  • User-programmable offset and gain
  • Robust architecture, including output fault protection
  • EMC test standards:
    • IEC 61000-4-6 conducted immunity (10 V, Class A)
    • IEC 61000-4-3 radiated immunity (20 V/m, Class A)
    • IEC 61000-4-2 ESD (±6 kV contact, Class B)
    • IEC 61000-4-4 electrical fast transient (EFT) (±4 kV, Class B)
    • IEC 61000-4-5 surge (±4 kV, Class B)
    • CISRP 11 Radiated Emissions (Class B)
  • 32-lead, 5 mm × 5 mm LFCSP
  • −40°C to +105°C temperature range

Product Details

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

  1. Functional safety approved to SIL 2/SC3 by TÜV Rheinland.
  2. Range of advanced diagnostic features, including an integrated ADC for high reliability.
  3. 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.
  4. Programmable power control (PPC) mode to enable faster settling time (15 µs typical).
  5. 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

Safety Details
The safety function defined for the ADFS5758 takes a digital input code and produces an output unipolar current to within ±2.5% of the full-scale range, proportional to the digital input code. For example, 2.5% of a 4 mA to 20 mA range is 400 µA. Therefore, the output current is within ±400 µA of the programmed output. If the safety function is compromised (a fault is detected in the system), the safe state for the ADFS5758 is open circuit/high impedance. The diagnostic coverage (DC) of the ADFS5758 for an assumed use case is >90%. A detailed description of the configuration, operation, SFF calculations, FIT data, and other required metrics for the ADFS5758 in a functionally safe application can be found in the ADFS5758 Safety Manual (available by request). Die and pin FME(D)As have also been completed and are available (in addition to the Safety Manual) on request from Analog Devices, Inc. Please see below.


Functional Safety Manual & Safety Report
The Functional Safety Manual & Safety Report are available upon completion of a Non-Disclosure Agreement (NDA) (pdf). Send your completed forms, project details, company information and contact by e-mail to ADFS5758@analog.com. Additional support is available from your Analog Devices local sales.

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.