Serial 10-bit 4-channel D/A Converter
MOTOROLA
Technical Summary
2-15
2.14 Serial 10-bit 4-channel D/A Converter
The 56F805EVM board contains a serial 10-bit, 4-channel D/A converter connected to the
56F805’s SPI port. The output pins are uncommitted and are connected to a 4X2 header,
J20, to allow easy user connections. Refer to
for the D/A connections and to
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. This trimpot is preset to 2.05V, which provides
approximately 2mV per step.
Figure 2-10. Serial 10-bit, 4-Channel D/A Converter
Table 2-10. D/A Header Description
J20
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
56F805
U18
D/A CONNECTOR
MOSI
MISO
SCLK
PB4
RSTO
DIN
DOUT
SCLK
CS
CL
OUT A
OUT B
OUT C
OUT D
Vref
1
3
5
7
2
4
6
8
J20
+3.3VA
10K
+3.3V
+3.3VA
R107
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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