Texas Instruments DAC9881EVM - DAC9881 Evaluation Module DAC9881EVM DAC9881EVM Datenbogen
Produktcode
DAC9881EVM
2
6
1
5
3
4
2
6
1
5
3
4
2
6
1
5
3
4
Using the DAC9881EVM with DXP
www.ti.com
Table 7. Jumper Setting Function (continued)
Reference
Jumper Setting
Function
The DAC9881’s IOV
DD
is powered with +5VD.
J3
The DAC9881’s IOV
DD
is powered with +1.8VD.
The DAC9881’s IOV
DD
is powered with +3.3VD.
Legend:
Indicates the corresponding pins that are shorted or closed.
5.6
DAC9881EVM Schematic
The DAC9881EVM schematic appears as the last page of this manual.
6
Using the DAC9881EVM with DXP
The DAC9881EVM is compatible with the DAC eXerciser Program (DXP) from Texas Instruments. DXP is
a tool that can generate the necessary code required to output various signals and waveforms from the
DAC9881EVM. The DAC9881EVM-DXP kit combines the DAC9881EVM board with the TMS320VC5509
DSP-based modular motherboard (MMB0), and includes DXP software for evaluation using any available
USB port.
a tool that can generate the necessary code required to output various signals and waveforms from the
DAC9881EVM. The DAC9881EVM-DXP kit combines the DAC9881EVM board with the TMS320VC5509
DSP-based modular motherboard (MMB0), and includes DXP software for evaluation using any available
USB port.
DXP is a program for controlling the digital input signals such as the clock, LDAC, CS, and SDI. Wave
tables are built into the DSP software to allow Sine, Ramp, Triangle, and Square wave signals to be
generated by the DAC9881. Straight DC outputs also can be obtained.
tables are built into the DSP software to allow Sine, Ramp, Triangle, and Square wave signals to be
generated by the DAC9881. Straight DC outputs also can be obtained.
The DAC9881EVM-PDK is controlled by loading a DAC EVM configuration into the MMB0. For complete
information about installing and configuring DXP, see the DXP User's Guide, available for download from
the TI Web site.
information about installing and configuring DXP, see the DXP User's Guide, available for download from
the TI Web site.
This section covers the specific operation of the DAC9881EVM-PDK. Throughout this document, the
abbreviation EVM and the term evaluation module are synonymous with the DAC9881EVM.
abbreviation EVM and the term evaluation module are synonymous with the DAC9881EVM.
6.1
Hardware
The hardware consists of two main components, the first is the DAC9881EVM itself and the other is a
modular motherboard called the MMB0. The MMB0 board houses a TMS320VC5507DSP which controls
the DAC9881 serial interface.
modular motherboard called the MMB0. The MMB0 board houses a TMS320VC5507DSP which controls
the DAC9881 serial interface.
The hardware needs to be configured such that the DAC9881EVM is plugged onto the board onto the
MMB0 aligning female connectors P4, P2, and P6 (bottom side of the DAC9881EVM) with male
connectors J4, J7, and J5 on the MMB0. Exercise caution when assembling the boards as it is possible to
misalign the connectors. Do not connect the MMB0 to your PC before installing the DXP software.
Installing the software ensures that the necessary drivers are properly loaded to run the hardware.
MMB0 aligning female connectors P4, P2, and P6 (bottom side of the DAC9881EVM) with male
connectors J4, J7, and J5 on the MMB0. Exercise caution when assembling the boards as it is possible to
misalign the connectors. Do not connect the MMB0 to your PC before installing the DXP software.
Installing the software ensures that the necessary drivers are properly loaded to run the hardware.
16
DAC9881 Evaluation Module
SLAU279A – March 2009 – Revised November 2009
Copyright © 2009, Texas Instruments Incorporated