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The AD5758 digital-to-analog converter (DAC) from Analog Devices incorporates the company’s second-generation Dynamic Power Control (DPC) to enable high density AOUT modules without requiring de-rating, the need to turn off channels due to thermal build up, resulting in lower cost, more compact designs.

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-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 AD5758 is Analog Devices lowest power industrial DAC.

The AD5758 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 watchdog timer (WDT).

AD5758 Functional Block Diagram

The AD5758 offers improved diagnostic features over its predecessors, such as an integrated 12-bit diagnostic analog-to-digital converter (ADC). Additional robustness is built-in with the inclusion of a line protector on the VIOUT, +VSENSE, and −VSENSE pins, this provides output fault protection to safeguard the DAC in the event of an incorrect connection. The AD5758’s compact 5 mm x 5 mm package size gives the device the smallest footprint in the industry.

When used with its companion power management unit (PMU)/isolator (ADP1031), the AD5758 is capable of enabling designers to develop an eight channel to channel isolated analog output module with less than 2 W power dissipation, while meeting CISPR 11 Class B.

The companion ADP1031 device is a high performance, isolated micropower management unit (PMU) that combines an isolated flyback dc-to-dc regulator, an inverting dc-to-dc regulator, and a buck dc-to-dc regulator, providing three isolated power rails. Additionally, the ADP1031 contains four, high speed, serial peripheral interface (SPI) isolation channels and three general purpose isolators for channel to channel applications where low power dissipation and small solution size is required.

ADP1031 Typical Application Circuit

Operating over an input voltage range of +4.5 V to +60 V, the ADP1031 generates isolated output voltages of +6 V to +28 V (adjustable version) or+ 21 V and +24 V (fixed versions) for V_OUT1 factory programmable voltages of +5.15 V, +5.0 V, or +3.3 V for V_OUT2, and an adjustable output voltages of −24 V to −5 V for V_OUT3.

By default, the ADP1031 flyback regulator operates at a 250 kHz switching frequency and the buck and inverting regulators operate at 125 kHz. All three regulators are phase shifted relative to each other to reduce electromagnetic interference (EMI). The ADP1031 can be driven by an external oscillator in the range of 350 kHz to 750 kHz to ease noise filtering in sensitive applications.

The digital isolators integrated in the ADP1031 use Analog Devices iCoupler® chip scale transformer technology, optimized for low power and low radiated emissions.

The ADP1031 is available in a 9 mm × 7 mm, 41-lead LFCSP and is rated for a −40°C to +125°C operating junction temperature range.

Click below for short video explaining how Analog Devices can help solve the size and heat challenges of analog outputs

The AD5758 and ADP1031 devices are ideal for use in Process control, Actuator control, Channel isolated analog outputs, Industrial automation, Instrumentation, Data acquisition systems, Data and power isolation, HART network connectivity, Programmable logic controller (PLC) and distributed control system (DCS) applications.

AD5758 + ADP1031 Eight Channel Analog Output Module - Demonstration Platform

To show how to solve the size and heat challenges of analog outputs, Analog Devices has introduced the DEMO-AD5758-AO8Z board that demonstrates a system-level concept using the AD5758 industrial DAC and the ADP1031 for power and data Isolation to implement a compact, eight channel, channel-to-channel isolated, analog output (AO) module. The module is designed to dissipate less than 2 W worst case power dissipation over a wide range of operating conditions.

Anglia are offering customers a FREE demonstration board and samples of the AD5758 industrial DAC and ADP1031 micropower isolated PMU from Analog Devices, please fill in the form below to register your interest now.