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2.13 Serial 10-bit 4-channel D/A Converter (Optional)
The 56F8346EVM board contains the provions for a user to provide a serial 10-bit,
4-channel D/A converter connected to the 56F8346'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 2-11
for the D/A connections and
D/A's output full-scale range value can be set to a value from +0.0V to +2.4V by a
trimpot, R37. 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, JG8, can be used to extend or isolate the
serial chain.
56F8436
MOSI0
MISO0
SCLK0
RSTO
Figure 2-11. Serial 10-bit, 4-Channel D/A Converter
Pin #
MOTOROLA
Freescale Semiconductor, Inc.
Table 2-12
MAX5251
DIN
JG8
2
1
DOUT
SCLK
SS0
CS
CL
Table 2-12. D/A Header Description
J4
Signal
1
D/A Channel 0
3
D/A Channel 1
5
D/A Channel 2
7
D/A Channel 3
Technical Summary
For More Information On This Product,
Go to: www.freescale.com
Serial 10-bit 4-channel D/A Converter (Optional)
for the header's pin out. The
D/A Connector
1
D/A 0
D/A 1
3
5
D/A 2
D/A 3
7
V
REF
+3.3V A
R37
Pin #
Signal
2
AGND
4
AGND
6
AGND
8
AGND
2
4
6
8
2-21
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