Datasheet
Features
1-2
1.1 Features
This EVM features the DAC7654 digital-to-analog converters (DAC). It
provides a quick and easy way to evaluate the functionality and performance
of the high-resolution serial input quad DAC. The EVM provides the serial
interface header to easily attach to any host microprocessor or TI DSP base
system for communication.
1.2 Power Requirements
The following sections describe the power requirements of this EVM.
1.2.1 Supply Voltage
The dc power supply for the digital section (V
DD
) of this EVM is dedicated to
5 V via the J3−1 terminal or J6−10 terminal and is referenced to ground through
the J3−2 and J6−5 terminals. The power for IOV
DD
can be selected between
3.3 V and 5 V via the W23 jumper. If the 5 V is selected for IOV
DD
, it is basically
the same power as V
DD
. The 3.3 V comes from J3−3 or J6−9 terminals and
referenced to J3−2 and J6−5, respectively.
The dc power supply requirements for the analog section of this EVM are as
follows: the V
CC
and V
SS
are typically ±15 V but can range from ±4.5 V
minimum to ±18 V maximum and connect through J1−3 and J1−1,
respectively, or through J6−1 and J6−2 terminals. The 5 VA connects through
J6−3 and the −5 VA connects through J6−4. All of the analog power supplies
are referenced to analog ground through J1−2 and J6−6 terminals.
The device under test (U1) analog power supply can be provided by ±5 VA (via
J6−3 and J6−4). The V
CC
supply source provides the positive rail of the
external output operational amplifier, U2. The negative rail of U2 can be
selected between V
SS
and AGND via the W5 jumper. The external operational
amplifier is installed as an option to provide output signal conditioning or for
other output configurations.
CAUTION
To avoid potential damage to the EVM board, make sure the correct
cables are connected to their respective terminals as labelled on
the EVM board.
Stresses above the maximum listed voltage ratings may cause
permanent damage to the device.
1.2.2 Reference Voltage
The precision voltage reference up to ±2.5 V is internally generated by the
DAC7654. This provides the DAC7654 voltage output range.