Single-Channel, 16-Bit, Current/Voltage Output DAC,
Functional Safety Approved for Unipolar Current Output
Data Sheet
ADFS5758
configuration. The safe state for the ADFS5758 is open circuit/high
FEATURES
impedance.
Functional safety approved to SIL 2/SC3 for unipolar current
output by TV Rheinland, File Number 968/FSP
The ADFS5758 is a single-channel, voltage and current output
2055.00/20
digital-to-analog converter (DAC) that operates with a power
Current/voltage output available on a single terminal
supply range from 33 V minimum on AVSS to +33 V maximum
Current output ranges: 0 mA to 20 mA, 4 mA to 20 mA,
on AVDD1 with a maximum operating voltage between the two rails
0 mA to 24 mA, 20 mA, 24 mA, 1 mA to +22 mA
of 60 V. On-chip dynamic power control (DPC) minimizes
Voltage output ranges (with 20% overrange): 0 V to 5 V,
package power dissipation, which is achieved by regulating the
0 V to 10 V, 5 V, and 10 V
supply voltage (V ) to the VI output driver circuitry from
DPC+ OUT
Advanced on-chip diagnostics
4.95 V to 27 V using a buck dc-to-dc converter, optimized for
12-bit ADC functioning as an independent monitoring
minimum on-chip power dissipation. The CHART pin enables a
function that can validate the output and accuracy.
HART signal to be coupled onto the current output.
On-chip reference
The device uses a versatile 4-wire serial peripheral interface (SPI)
DPC for thermal management
that operates at clock rates of up to 50 MHz and is compatible with
User-programmable offset and gain
standard SPI, QSPI, MICROWIRE, DSP, and microcontroller
Robust architecture, including output fault protection
interface standards. The interface also features an optional SPI
EMC test standards
cyclic redundancy check (CRC) and a windowed watchdog timer.
IEC 61000-4-6 conducted immunity (10 V, Class A)
The ADFS5758 offers improved diagnostic features from its
IEC 61000-4-3 radiated immunity (20 V/m, Class A)
predecessors, such as an integrated independent 12-bit diagnostic
IEC 61000-4-2 ESD (6 kV contact, Class B)
analog-to-digital converter (ADC) that can be used to digitize both
IEC 61000-4-4 electrical fast transient (EFT) (4 kV, Class B)
internal and external nodes.
IEC 61000-4-5 surge (4 kV, Class B)
CISRP 11 radiated emissions (Class B)
PRODUCT HIGHLIGHTS
32-lead, 5 mm 5 mm LFCSP
1. Functional safety approved to SIL 2/SC3 by TV Rheinland.
40C to +105C temperature range
2. Range of advanced diagnostic features, including an
APPLICATIONS
integrated ADC for high reliability.
Process control
3. DPC using an integrated buck dc-to-dc converter for thermal
Actuator control
management. When used with the ADP1031, the ADFS5758
Channel isolated analog outputs
enables eight channel to channel isolated outputs at <2 W
Programmable logic controller (PLC) and distributed control
dissipated power.
system (DCS) applications
4. Programmable power control (PPC) mode to enable faster
HART network connectivity
settling time (15 s typical).
5. Highly robust with output protection from miswire events
GENERAL DESCRIPTION
(38 V).
The ADFS5758 is a single-channel, 16-bit, current/voltage output
DAC. The device is functional safety approved for unipolar current COMPANION PRODUCTS
output and is a fully compliant item with a systematic capability of
Product Family: AD5755-1, AD5422, AD5758, AD5753, AD5423
SC3, which can be used in safety-related applications up to SIL 2,
HART Modem: AD5700, AD5700-1
according to IEC 61508. This arrangement allows a single
External References: ADR431, ADR3425, ADR4525
ADFS5758 to be used to achieve SIL 2 for a nonredundant
Digital Isolators: ADuM142D, ADuM141D
Power: ADP1031, LT8300, ADP2360, ADM6339
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ADFS5758 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Fault Protection .......................................................................... 36
Applications ...................................................................................... 1 Current Output .......................................................................... 36
Product Highlights ........................................................................... 1 HART Connectivity ................................................................... 37
Companion Products ....................................................................... 1 Digital Slew Rate Control .......................................................... 37
Revision History ............................................................................... 2 ADFS5758 Address Pins ........................................................... 37
Functional Block Diagram .............................................................. 3 SPI Interface and Diagnostics .................................................. 38
Specifications .................................................................................... 4 Windowed Watchdog Timer (WDT) ..................................... 39
AC Performance Characteristics .............................................. 10 User Digital Offset and Gain Control ..................................... 39
Timing Characteristics .............................................................. 11 DAC Output Update and Data Integrity Diagnostics .......... 40
Absolute Maximum Ratings ......................................................... 14 Lockable User Configuration Space ........................................ 41
Thermal Resistance .................................................................... 14 Use of Key Codes ....................................................................... 42
ESD Caution................................................................................ 14 Software Reset ............................................................................. 42
Pin Configuration and Function Descriptions .......................... 15 Calibration Memory CRC ......................................................... 42
Typical Performance Characteristics ........................................... 17 Background CRC Check ........................................................... 42
Current Output ........................................................................... 17 Internal Oscillator Diagnostics ................................................ 42
Voltage Output ........................................................................... 22 V External Capacitor Detection .......................................... 43
LDO
DC-to-DC Block ......................................................................... 26 Sticky Diagnostic Results Bits .................................................. 43
Reference ..................................................................................... 27 Background Supply and Temperature Monitoring .............. 43
General ......................................................................................... 28 Output Fault................................................................................ 43
Terminology .................................................................................... 29 ADC Monitoring ........................................................................ 44
Theory of Operation ...................................................................... 31 Register Map ................................................................................... 50
Functional Safety Operation ..................................................... 31 Writing to Registers ................................................................... 50
DAC Architecture ...................................................................... 31 Reading from Registers ............................................................. 51
Serial Interface ............................................................................ 32 Programming Sequence to Enable the Output Correctly .... 54
Power-On State of the ADFS5758 ........................................... 32 Register Details ........................................................................... 56
Power Supply Considerations .................................................. 32 Applications Information ............................................................. 73
Device Features and Diagnostics .................................................. 34 Outline Dimensions ....................................................................... 75
Power Dissipation Control ....................................................... 34 Ordering Guide .......................................................................... 75
Interdie 3-Wire Interface .......................................................... 35
Voltage Output ........................................................................... 36
REVISION HISTORY
6/2020Revision 0: Initial Version
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