Datasheet

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V
DD
0.1 F 10 F
V
DD
IOV
DD
0.1 F 10 F
IOV
DD
VFB
V
OUT
V
REF
+
0.1 F
1 to 10 F
V
REF
GND
IOGND
V
REF
−
A0
A1
PD
LDAC
RST
R/W
CS
16 Bits8 Bits
8 Bits
D[15:0]
(Other Pins Omitted for Clarity)
P4[0:7]
P5[0:7]
P2:0
P2:1
P2:2
P2:4
P2:5
P2:6
P2:7
MSP430F149 DAC8544
V
OUT
DAC8544 to TMS320C5402 DSP
V
DD
0.1 F 10 F
V
DD
IOV
DD
0.1 F 10 F
IOV
DD
VFB
V
OUT
V
REF
+
0.1 F
1 to 10 F
V
REF
GND
IOGND
V
REF
−
LDAC
CS
16 Bits
D[15:0]
(Other Pins Omitted for Clarity)
D[15:0]
A[23:0]
IOSTRB
R/W
XF(I/O)
TMS320C5402 DAC8544
V
OUT
Address
Decoder
EN
R/W
BIPOLAR OPERATION USING THE DAC8544
DAC8544
SLAS420A – MAY 2004 – REVISED JUNE 2005
Figure 32. DAC8544 to MSP430 Microcontroller
Figure 33 shows the connections between the DAC8544 and the TMS320C5402 digital signal processor. Data is
provided via the parallel data bus of the DSP while the DAC CS control input is derived from the decoded I/O
strobe signal. The IOSTRB in addition to the R/ W and XF(I/O) signals control the data transmission to and from
the DAC as well as the LDAC control. With additional decoding, multiple DAC8544s can be connected to the
same parallel data bus of the DSP.
Figure 33. DAC8544 to TMS320 DSP
The DAC8544 has been designed for single-supply operation but a bipolar output range is also possible using
the circuit shown in Figure 34 . The circuit allows the DAC8544 to achieve an analog output range of ±5 V.
Rail-to-rail operation at the amplifier output is achievable using an OPA703 as the output amplifier.
16