Texas Instruments DAC7741 Evaluation Module DAC7741EVM DAC7741EVM Datenbogen
Produktcode
DAC7741EVM
www.ti.com
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EVM Basic Functions
DAC Out
(J2)
(J4)
(J4)
(J3)
+ 15 V
- 15 V
GND
GND
(J1)
(J6)
(J11)
(J12)
(J12)
W13
W14
TP1
VCC
VCC
VDD
VDD
VSS
VSS
LDAC
RSTSEL
DB15 (MSB)
DB1 (MSB)
A2...A0
CS
R/W
RST
+ 3.3 V
+ 3.3 V
REFEN
TP2
+REF
Ext Ref
Ext Ref
Input
IN
External
Reference
Module
DAC Module
3.3 V
Logic and
Translators
REF
IN
REF
OUT
Output
Buffer
Module
W4
W3
+ 15 V
- 15 V
EVM Basic Functions
The on-chip reference buffer output is funneled out through V
REF
pin, which is used to set up the
DAC7741 output amplifier into one of three voltage output modes. V
REF
can also be used to drive other
system components that require external voltage reference. See the data sheet for more information
regarding the internal reference feature.
regarding the internal reference feature.
CAUTION
When applying an external voltage reference through TP1, J2-20, or J4-20,
make sure that it does not exceed 14.35 V maximum. Otherwise, this can
permanently damage the DAC7741, U1, device under test.
make sure that it does not exceed 14.35 V maximum. Otherwise, this can
permanently damage the DAC7741, U1, device under test.
The DAC7741 EVM is a functional evaluation platform to test certain functional characteristics of the
DAC7741 digital-to-analog converter. Functional evaluation of the DAC device can be accomplished with
the use of any microprocessor, TMS320™ DSP family, or some sort of a signal/waveform generator.
DAC7741 digital-to-analog converter. Functional evaluation of the DAC device can be accomplished with
the use of any microprocessor, TMS320™ DSP family, or some sort of a signal/waveform generator.
The headers, J1 and J3, are provided to connect the necessary control signals and data needed to
interface a microprocessor/microcontroller, TI’s DSP Starter Kit, or waveform generator to the DAC7741
EVM. A custom cable can be built for this purpose if using the EVM without the use of TI’s 5-6k interface
adapter board or the HPA449 platform.
interface a microprocessor/microcontroller, TI’s DSP Starter Kit, or waveform generator to the DAC7741
EVM. A custom cable can be built for this purpose if using the EVM without the use of TI’s 5-6k interface
adapter board or the HPA449 platform.
The 5-6k interface adapter board is used for most of TI’s DSP Starter Kits (DSK). Hence, if using the
TMS320C5x™ DSP generation and TMS320C6x™ DSP generation DSKs, the 5-6k interface adapter
board proves practical, as no cabling is required. In addition, the HPA449 platform is also available for use
if the MSP430 microcontroller is desired as the host processor. Call or e-mail TI for more information
regarding the adapter interface board.
TMS320C5x™ DSP generation and TMS320C6x™ DSP generation DSKs, the 5-6k interface adapter
board proves practical, as no cabling is required. In addition, the HPA449 platform is also available for use
if the MSP430 microcontroller is desired as the host processor. Call or e-mail TI for more information
regarding the adapter interface board.
The output of the DAC can be monitored through one of two terminals J2 or J4. Shorting pins 1 and 2 of
jumper W30, allows the DAC output to be seen on J4 pins 2, 4, 6, and 8. The 6-pin header, W13, provides
different options of the DAC output, but requires the output operational amplifier, U2, to first be configured
correctly for the desired waveform characteristic. Shorting pins 1 and 2 of W13 allows the user to monitor
the raw output of the DAC7741.
jumper W30, allows the DAC output to be seen on J4 pins 2, 4, 6, and 8. The 6-pin header, W13, provides
different options of the DAC output, but requires the output operational amplifier, U2, to first be configured
correctly for the desired waveform characteristic. Shorting pins 1 and 2 of W13 allows the user to monitor
the raw output of the DAC7741.
A block diagram of the EVM is shown below in the
Figure 1. EVM Block Diagram
DAC7741EVM
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SLAU093A – October 2002 – Revised May 2005