Datasheet

EVM Basic Functions
1-4
common connector headers. Refer to the accompanying DSK manual for
proper orientation. If the TI DSK does not map out correctly with the EVM’s
common connector headers, then a smart adapter, SPRA711 adapter, can be
used. The smart adapter routes the necessary signals properly with ease by
correctly configuring the adapter board for the DSK being used.
A precision reference voltage is provided onboard, which can be adjusted to
the user’s preference through the R29 potentiometer. This sets the effective
range of the DAC’s output signal.
The output of the DAC can be monitored through three different access points
which are as follows: an SMA jack (J11), a test point (TP1), and also a header
through pin 1 of J3. The 6-pin header, W13, provides different flavors of the
DAC output, but requires the output op-amp, U12, to be configured correctly
first for the desired waveform characteristic. Shorting pins 1 and 2 of W13 may
allow the user to monitor the raw output of the DAC.
A bipolar mode of operation is integrated into the EVM board through the
output op-amp, U12. This option to operate in bipolar mode yields a rail-to-rail
output voltage range of ±5 V maximum. Although the op-amp, U12, circuit is
originally intended for bipolar operation, a single supply option can also be
implemented by properly configuring the jumpers.
A block diagram of the EVM is shown in Figure 1–1.
Figure 1–1. EVM Block Diagram
W2
DAC Module
DC SAM Module
Power Module
(J11)
(J3)
(TP1)
5 V
–5 V
+ Supply
FS
SCLK
DIN
DAC Out
W13
W4
W3
Output Buffer
Module
V
REF
15 V
GND
–15 V
GND
15 V
User Interface
Module