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參數(shù)資料
| 型號： | TLV5619CDWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 1 us SETTLING TIME, 12-BIT DAC, PDSO20 |
| 封裝： | GREEN, PLASTIC, SOIC-20 |
| 文件頁數(shù)： | 5/23頁 |
| 文件大小： | 478K |
| 代理商： | TLV5619CDWR |
www.ti.com
TLV5619 INTERFACED TO TMS320C203 DSP
Hardware Interface
A2
A3
A4
A6
IS
D(0–11)
5 V
A
B
C
G1
G2A
G2B
CS
D(0–11)
Y1
VDD
PD
WE
REFIN
Output
REF191
OUT
LDAC
WE
RLOAD
TMS320C203
74AC138
TLV5619
12
Software
TLV5619
SLAS172F – DECEMBER 1997 – REVISED FEBRUARY 2004
APPLICATION INFORMATION (continued)
Figure 13 shows an example of the connection between the TLV5619 and the TMS320C203 DSP. The only
other device that is needed in addition to the DSP and the DAC is the 74AC138 address decoding circuit . Using
this configuration, the DAC address is 0x0084 within the I/O memory space of the TMS320C203.
LDAC is held low so that the output voltage is updated with the rising WE edge. The power down mode is
deactivated permanently by pulling PD to VDD.
Figure 13. TLV5619 to TMS320C203 DSP Interface Connection
No setup procedure is needed to access the TLV5619. The output voltage can be set using one command:
out data_addr,
DAC_addr
Where data_addr points to the address location (in this example 0x0060) holding the new output voltage data
and DAC_addr is the I/O space address of the TLV5619 (in this example 0x0084).
The following code shows, how to use the timer of the TMS320C203 as a time base to generate a voltage ramp
with the TLV5619. A timer interrupt is generated every 205 s. The corresponding interrupt service routine
increments the output code (stored at 0x0060) for the DAC and writes the new code to the TLV5619. Only the 12
LSBs of the data in 0x0060 are used by the DAC, so that the resulting period of the saw waveform is:
t = 4096
× 205 E-6 s = 0.84 s
13
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