ADI's AD5758 is a 16-bit digital-to-analog converter (DAC) with single-channel voltage and current output, operates from -33V (AVSS) to +33V (AVDD1), 16-bit performance, and includes on-chip diagnostics including a 12-bit ADC. User-programmable harmonic gain, current output range 0 mA - 20 mA, 4 mA - 20 mA, 0 mA - 24 mA, ±20 mA, ±24 mA, −1 mA - +22 mA, voltage output range 0 V - 5 V, 0 V - 10 V, ±5 V, and ±10 V, Operating Temperature Range −40°C to +11°5C, Mainly Used in Process Control, Actuator Control, Isolated Analog Output, Programmable Logic Control PLC and Distributed Control System (DCS) and HART network connections. This article describes the highlights and key features of the AD5758 product, functional block diagrams and key features of the EVAL-AD5758SDZ evaluation board, circuit diagrams, bill of materials, and PCB design drawings.
The AD5758 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 5 V to 27 V using a buck dc 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, QSPITM, MICROWIRETM, DSP, and microcontroller interface standards. The interface is also known as SPI duplex redundancy check (CRC) and a watchdog timer (WDT). The AD5758 offers improved Diagnostic features from its predecessors, such a s output current monitoring and an integrated 12-bit diagnostic analog-to-digital converter (ADC). Additional robustness is provided by the inclusion of a fault protection switch on the VIOUT, +VSENSE, and −VSENSE pins.
AD5758 Product Highlights:
1. Range of diagnostic features, including integrated ADC.
2. DPC, using an integrated buck dc-to-dc converter for thermal management, higher channel count in smaller size module housing.
3. Programmable power control (PPC) mode to enable faster settling time (15 μs typical).
4. 16-bit performance.
5. HART compliant
AD5758 main features:
16-bit resolution and monotonicity
DPC for thermal management
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, including a 12-bit ADC
On-chip reference
Robust architecture, including output fault protection
−40°C to +11°5C temperature range
32-lead, 5 mm × 5 mm LFCSP package
AD5758 Application:
Process control
Actuator control
Channel isolated analog outputs
Programmable logic controller (PLC) and distributed control systems (DCS) applications
HART network connectivity
Figure 1. Functional block diagram of the AD5758
Evaluation Board EVAL-AD5758SDZ
This user guide describes the evaluation board for the AD5758, a functional safety certified, single-channel, voltage and current output, digital-to-analog converter (DAC) with on-chip dynamic power control (DPC) that minimizes package power dissipation. The full installation on the AD5758, refer to the AD5758 data sheet. Consult the data sheet when using the EVAL-AD5758SDZ. The configuration of the various link options is explained in the Evaluation Board Hardware section. The installation of the companion software is discussed in The Software Quick Start Procedures section. The EVAL-AD5758SDZ, shown in Figure 1, requires the EVAL- SDP-CS1Z board. The EVAL-AD5758SDZ interfaces to the USB port of the PC via the EVAL-SDP-CS1Z board. Software that allows The user to easily program the AD5758, that the Analysis|Control|Evaluation (ACE) software, is available with the EVAL-AD5758SDZ.
Evaluation Board EVAL-AD5758SDZ Key Features:
Full featured evaluation board for the AD5758
On-board 2.5 V ADR4525 reference
SPI ACE software for control
EVALUATION KIT CONTENTS
EVAL-AD5758SDZ evaluation board
EVAL-SDP-CS1Z
Figure 2. EVAL-AD5758SDZ outline of the evaluation board
Figure 3. Evaluation board EVAL-AD5758SDZ circuit diagram (1): AD5758
Figure 4. Evaluation Board EVAL-AD5758SDZ Circuit Diagram (2): AD5758 Power Supply and Reference Selection
Figure 5. Evaluation Board EVAL-AD5758SDZ Circuit Diagram (3): SDP-S Board Connection, Address Pins and LDAC and RESET Pins
Figure 6. Evaluation board EVAL-AD5758SDZ circuit diagram (4): AD5758 output stage
Evaluation board EVAL-AD5758SDZ material list:
Figure 7. Evaluation board EVAL-AD5758SDZ PCB design drawing (1): top layer
Figure 8. Evaluation board EVAL-AD5758SDZ PCB design (2): Layer 1
Figure 9. Evaluation board EVAL-AD5758SDZ PCB design drawing (3): ground and power planes, layers 2 and 3
Figure 10. Evaluation Board EVAL-AD5758SDZ PCB Design (4): Layer 4
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