Texas Instruments DAC8801/11EVM, Руководство пользователя

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Schematic
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Jumper
Reference Setting Function
Disconnect the inverting input terminal of U4A from ground.
W15
Connect the inverting input terminal of U4A from ground.
Chip Enable pin is driven via W2 jumper with either CS pin on J2-1 or FSX pin on J2-7.
W25
Chip Enabled and is always active.
Jumper pins 1-2 or pins 3-4 together to connect the feedback resistor, R
FB
, to the output of U5.
J4
Jumper pins 5-6 or pins 7-8 together to connect the MDAC V
OUT
to J5 header via the RC filter.
MDAC V
OUT
is routed to the inverting input of U2.
MDAC V
OUT
is routed to the non-inverting input of U2.
J5
The noninverting input of U2 is tied to AGND.
MDAC V
OUT
is routed to the inverting input of U2 and the noninverting input of U2 is tied to
AGND.
Legend: Indicates the corresponding pins that are shorted or closed.
8 Schematic
The schematic for the DAC8801/11EVM PCB is appended to this document.
9 Using the DAC8811EVM with DXP
The DAC8811EVM is compatible with the DAC eXerciser Program (DXP) from Texas Instruments. DXP is
a tool that can generate the necessary control signals required to output various signals and waveforms
from the device installed on the DAC8811EVM. The DAC8811EVM-PDK kit combines the DAC8811EVM
board with the DSP based modular motherboard MMB0. The kit includes the DXP software for evaluation
using any available USB port on a Microsoft
®
Windows
®
XP-based computer.
DXP is a program for controlling the digital input signals such as the clock, 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
DAC8811. Straight dc outputs can also be obtained.
The DAC8811EVM-PDK uses the DSP-based MMB0 to control the DAC EVM through the DXP software.
For complete 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 DAC8811EVM-PDK.
9.1 Hardware
The hardware consists of two primary components: the DAC8811EVM itself and a modular motherboard
called the MMB0. The MMB0 board houses a TMS320VC5507 DSP that controls the serial interface to the
device loaded on the EVM board.
12 DAC8801/11EVM SLAU151A – January 2005 – Revised November 2009
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