This version is outdated by a newer approved version.
This version (11 Feb 2021 17:28) was approved by Ioana Chelaru.The Previously approved version (09 Feb 2021 11:56) is available.
This version (11 Feb 2021 17:28) was approved by Ioana Chelaru.The Previously approved version (09 Feb 2021 11:56) is available.This is an old revision of the document!
Table of Contents
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
End of Document
resources/eval/user-guides/circuits-from-the-lab/cn0531.1613060921.txt.gz · Last modified: 11 Feb 2021 17:28 by Ioana Chelaru