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This version (25 Feb 2021 03:09) was approved by Mark Thoren, Mihai Ionut Suciu.The Previously approved version (11 Feb 2021 17:28) is available.Diff

EVAL-CN0531-PMDZ Overview

EVAL-CN0531-PMDZ is a minimalist 1 ppm, 20-Bit, ±1 LSB INL, DAC SPI Pmod board suitable for medical instrumentation, test and measurement equipment, industrial control or high end scientific and aerospace instrumentation. This module is designed as a low-cost alternative to the fully-featured AD5791 evaluation board. Multiple voltage references and power options are available to adapt this module depending on the application. With this module, the user is capable to use the onboard positive voltage reference or to connect external references. It is also possible to connect an external buffer if the onboard buffer doesn't suit the application. EVAL-CN0531-PMDZ can also be powered internal or external, depending on the needs. Also, additional control signals can be connected to the digital interface to control this module easily.



Functional block diagram



About the AD5791

The AD5791 is a single 20-bit, unbuffered voltage-output digital-to-analog converter (DAC) that operates from a bipolar supply of up to 33 V. The AD5791 accepts a positive reference input in the range 5 V to VDD − 2.5 V and a negative reference input in the range VSS + 2.5 V to 0 V. The AD5791 offers a relative accuracy specification of ±1 LSB max, and operation is guaranteed monotonic with a ±1 LSB differential nonlinearity (DNL) maximum specification. The device uses a versatile 3-wire serial interface that operates at clock rates up to 35 MHz and that is compatible with standard serial peripheral interface (SPI), QSPI™, MICROWIRE™, and DSP interface standards. The device incorporates a power-on reset circuit that ensures the DAC output powers up to 0 V and in a known output impedance state and remains in this state until a valid write to the device takes place. The device provides an output clamp feature that places the output in a defined load state.

Connectors and Configuration

Supply options
Solder Jumper Default Position Description and default connection
P6 Shorted Internal 3.3 V (connected at IOVDD and P1 pin 2)
P7 Shorted External 3.3 V (supply connected at P1 pin 3)
P8 Open External voltage supply (disconnected)
P11 Shorted External VDD supply (connected at P1 pin 6)
P12 Shorted External VSS supply (connected at P1 pin 5)
Voltage reference options
Solder Jumper Default Position Description and default connection
P9 Shorted Positive reference (connected at onboard 5 V
external reference and P4 pin 1)
P10 Shorted Negative reference (connected to GND and P4 pin 1)
Digital interface options
Solder Jumper Default Position Description and default connection
P14 Open LDAC connection (disconnected)
P15 Open CLR connection (disconnected)
P16 Open RESET connection (disconnected)
Digital interface options
Solder Jumper Default Position Description and default connection
P13 Shorted Output buffer (connected at onboard buffer)


Schematic, PCB Layout, Bill of Materials

Additional Information and Useful Links

Reference Demos & Software

resources/eval/user-guides/circuits-from-the-lab/cn0531.txt · Last modified: 25 Feb 2021 03:09 by Mark Thoren