Texas Instruments DAC8832EVM-PDK - DAC8832 Performance Demonstration Kit DAC8832EVM-PDK DAC8832EVM-PDK Datenbogen
Produktcode
DAC8832EVM-PDK
DAC Module
+5VA
GND
VDD
VDD
DAC Out
(J3)
(P3)
VDD
(J2)
(P2)
SCLK
W1
AGNDF
SDI
(J1)
(P1)
CS
±5VA
LDAC
R
FB
I
OUT
V
REF
V
DD
REF3025
External Reference from J1-20
U1
OPA353
+V
REF
TP1
INV
+
-
SW1
AGNDS
DGND
DAC Module:
- DAC8831IRGY
- DAC8832IRGY
- DAC8831IRGY
- DAC8832IRGY
U4
U5
U3
www.ti.com
EVM Overview
1.2.2
Reference Voltage
The externally generated +2.5VDC precision voltage reference is jumper selectable via W1. The reference
voltage can be selected either by the +2.5V onboard reference/buffer circuits (U4 and U5) or an external
reference applied to J1-20. The EVM ships out of factory with the default position (shunt on W1 pins 1-2)
of +2.5V reference that is supplied by REF3025 (U5), which is a 50ppm/°C with excellent line regulation
and stability. The +2.5VDC reference will provide the DAC8831/32’s voltage output range.
voltage can be selected either by the +2.5V onboard reference/buffer circuits (U4 and U5) or an external
reference applied to J1-20. The EVM ships out of factory with the default position (shunt on W1 pins 1-2)
of +2.5V reference that is supplied by REF3025 (U5), which is a 50ppm/°C with excellent line regulation
and stability. The +2.5VDC reference will provide the DAC8831/32’s voltage output range.
Moving the shunt at W1 to pins 2-3 allows an external reference applied to J1-20 to be used. Regardless
of the reference source, U4 provides a reference buffer to the DAC8831/32. If no buffer circuit is desired,
the EVM user can remove the resistor found at location R5 and apply an external reference directly to
TP1, referenced to AGND.
of the reference source, U4 provides a reference buffer to the DAC8831/32. If no buffer circuit is desired,
the EVM user can remove the resistor found at location R5 and apply an external reference directly to
TP1, referenced to AGND.
1.3
EVM Basic Functions
This EVM is designed primarily as an evaluation platform to test certain functional characteristics of the
DAC8831/32 digital-to-analog converter. The evaluation of the installed DAC device can be accomplished
with the use of any microprocessor, TI DSP or an appropriate signal/waveform generator.
DAC8831/32 digital-to-analog converter. The evaluation of the installed DAC device can be accomplished
with the use of any microprocessor, TI DSP or an appropriate signal/waveform generator.
The headers J2 (top side) and P2 (bottom side) are pass through connectors provided to allow the control
signals and data required to interface a host processor or waveform generator to the DAC8831/32EVM
using a custom built cable.
signals and data required to interface a host processor or waveform generator to the DAC8831/32EVM
using a custom built cable.
The buffered DAC output can be monitored through pin 2 of J1 header connector. The EVM also provides
a provision for Kelvin sense connection to increase performance of the DAC. This option does not come
factory installed, and the EVM user must provide the necessary parts and labor.
a provision for Kelvin sense connection to increase performance of the DAC. This option does not come
factory installed, and the EVM user must provide the necessary parts and labor.
A block diagram of the DAC8831/32EVM is shown in
.
Figure 1. DAC8831/32EVM Block Diagram
3
SLAU202A – December 2006 – Revised November 2009
DAC8831/32 Evaluation Module
Copyright © 2006–2009, Texas Instruments Incorporated