National Semiconductor ADC122S655 User Manual - page 5
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5
7. Apply the signals to control the SPI interface
at J6 or VIA5 to VIA7. See the evaluation
board schematic (Figure 10) or the J6 header
pin out (Figure 5) for more details.
3.2 Computer Mode
Refer to Figure 1 for locations of test points and
major components.
1. Run the WV 4 program, version 4.4 or higher
is required to interface to the WV4 board.
While the program is loading, continue below.
2. Connect a USB cable between the WV4
board and the PC running the WaveVision 4
software.
3. Connect the J6 header on the ADC122S655
evaluation board to the J7 WV4 serial
connector on the WV4 board. Refer to Figure
4 for the serial connection and Figure 5 for the
J6 header pin out.
Figure 4: WV4 to ADC122S655 Connection
Figure 5: J6 (WV4S) Header Pin Out
4. Connect a clean analog (not switching) +5.0V
power source with a 300mA current limit to
power connector J3 on the WV4 board.
Ground the GND connector and turn on the
power.
5. Connect a clean analog (not switching) +5.0V
power source with a 300mA current limit to
power connector TP12 on the ADC board.
Ground pin TP13 and turn on the power.
Place a shorting jumper between pins 1 & 2
of JP11 to power the board. LED D3 should
be ON.
Note: The evaluation board can also be
powered directly from the WV4 board by
placing a shorting jumper between pins 2 & 3
and removing the external supply.
6. Place an 8 MHz crystal oscillator into the
socket at Y2 and place a shorting jumper
between pins 1 & 2 of JP12. Alternatively,
connect a signal generator to TP15 (CLK_IN)
and place a shorting jumper between pins 2
& 3 of JP12 to use an external clock.
7. Place a shorting jumper across pins 2 & 3 of
JP8, see table 1 for more details.
8. Perform step 4 of section 3.1 to drive the
analog inputs. For information on changing
the configuration of the analog input section,
read section 2.0 Board Assembly for details.
The board comes ready for a DC coupled
differential input signal.
9. Perform step 5 or 6 of section 3.1 to select the
reference voltage.
10. Refer to section 5.0 on Software Operation
and Settings to setup WaveVision 4.
DOUT