Serial 10-bit 4-channel D/A Converter (Optional)
MOTOROLA Technical Summary 2-17
2.10 Serial 10-bit 4-channel D/A Converter (Optional)
The 56F8323EVM board contains the provions for a user to provide a serial 10-bit,
4-channel D/A converter connected to the 56F8323’s SPI #0 port. The output pins are
uncommitted and are connected to a 4x2 header, J4, to allow easy user connections. Refer
to Figure 2-8 for the D/A connections and Table 2-11 for the header’s pin-out. The D/A’s
output full-scale range value can be set to a value from +0.0V to +2.4V by a trimpot, R48.
If this trimpot is preset to +2.05V, it would provide approximately +2mV per step. If
another device must be used with SPI #0’s MISO signal and with the D/A converter on the
board, the daisy chain jumper, JG9, can be used to extend or isolate the serial chain.
Figure 2-8. Serial 10-bit, 4-Channel D/A Converter
Table 2-11. D/A Header Description
J4
Pin # Signal Pin # Signal
1 D/A Channel 0 2 AGND
3 D/A Channel 1 4 AGND
5 D/A Channel 2 6 AGND
7 D/A Channel 3 8 AGND
1
3
5
7
2
4
6
8
D/A Connector
D/A 0
D/A 1
D/A 2
D/A 3
+3.3VA
R48
V
REF
MAX5251
DIN
DOUT
SCLK
CS
CL
MOSI0
12
MISO0
SCLK0
SS0
JG9
56F8323
RSTO
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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