Features
1-2
1.1
Features
This EVM features the DAC8534 digital-to-analog converter. The DAC8534
EVM is a simple evaluation module designed for a quick and easy way to
evaluate the functionality and performance of the high resolution, quad-
channel, and serial input DAC. This EVM features a serial interface to
communicate with any host microprocessor or TI DSP-based system.
1.2
Power Requirements
The following sections describe the power requirements of this EVM.
1.2.1
Supply Voltage
The DC power supply requirement for the digital section (V
DD
) of this EVM is
typically 5 V connected to the J5-1, or via J6-10 terminal (when plugged in with
another EVM board or interface card) and is referenced to ground through the
J5 - 2 and J6 - 5 terminal. The DC power supply requirements for the analog
section of this EVM are as follows: the V
CC
and V
SS
ranges from 15.75 V to
- 15.75V maximum and connects through J1 - 3 and J1 - 1 respectively, or
through J6 - 1 and J6 - 2 terminals. The 5 VA connects through J5 - 3 or J6 - 3
and the 3.3 VA connects through J6 - 8. All of the analog power supplies are
referenced to analog ground through J1 - 2 and J6 - 6 terminals.
The device under test (U1), can be powered by connecting an analog power
supply at terminal 5 VA or 3.3 VA and selecting the proper position of jumper
W1. This allows the DAC8534 analog section to operate from either supply
power, while the I/O and digital section is powered by 5 V, V
DD
.
The V
CC
supply source is mainly used to provide the positive rail of the external
output op amp U2, the reference chip U3, and the reference buffer U8. The
negative rail of the output op amp U2 can be selected between V
SS
and AGND
via W5 jumper. The external op amp is installed as an option to provide output
signal conditioning, or boost capacitive load drive and for other output mode
requirement desired.
CAUTION
To avoid potential damage to the EVM board, make sure that the correct
cables are connected to their respective terminals as labeled on the EVM
board.
Stresses above the maximum listed voltage ratings may cause permanent
damage to the device.
1.2.2
Reference Voltage
The 5 V precision voltage reference is provided to supply the external voltage
reference for the DAC through U3 (REF02), via jumper W4 by shorting pins
1 and 2. The reference voltage goes through an adjustable 100-K
W
potentiometer R11, in series with 20-k
Ω
R10, to allow the user to adjust the
reference voltage to its desired settings. The voltage reference is then