DAC81404
DAC_AVDD
DAC_DVDD
DAC_IOVDD
AVSS
VO UT A..D
GND
DGND
REFIO
1 F
REF6025
GND
VSENSE_N A..D
VSENSE_P A..D
CCOMP A..D
SPI
LAUNCHPAD
INTERFACE
GND
0
470pF
D
A
C
_
O
U
T
P
U
T
S
100mA Current
Output stage
AVSS
AVDD
1
0
0
VO UT_B
+/- 10V @100mA Max
GND
GND
AEVM_3.3V
DAC_IOVDD_EXT
DAC_IOVDD
DAC_DVDD
DAC_AVDD
DAC_AVSS
GND
DAC_IOVDD_EXT
DGND
GND
DAC_AVSS
AVSS
Detailed Description
10
SLAU825 – June 2020
Copyright © 2020, Texas Instruments Incorporated
BP-DAC81404EVM, BP-DAC61402EVM
3
Detailed Description
3.1
Hardware Description
The following subsections provide detailed information on the EVM hardware and jumper configuration
settings.
3.1.1
Theory of Operation
shows the block diagram of the BP-DAC81404EVM, DAC61402EVM board. All grounds are
shorted together using single-point shorts. The EVM board connects to the LaunchPad with the
BoosterPack connectors. There is an onboard reference, using the REF6025, which generates a 2.5-V
voltage reference, which can be used as an external reference for the DAC. Each channel outputs (named
as DAC_VOUT_A, DAC_VOUT_B, DAC_VOUT_C, and DAC_VOUT_D) are available in a 5-pin connector
which includes the force and sense connections for the DAC. A 470-pF capacitor is connected from the
C
COMP
pin to DAC output to compensate for the stability issues while driving large capacitive loads. DAC
power supplies can be configured through jumper options to allow operation for bipolar or unipolar. The
digital I/O supply of the DAC is provided by the LaunchPad interface by default; however, an external
option is also present on the board.
For applications requiring high current drive capability such as motor control or programmable power
supplies, an option is provided in the EVM to have up to 100-mA output current through external
transistors. To enable high current option, place jumpers J14 and J18 and remove jumper from J21.
Figure 6. BP-DAC81404EVM, BP-DAC61402EVM Hardware Block Diagram