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參數(shù)資料
| 型號： | TLV5613DW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 2.7 V TO 5.5 V 12-BIT PARALLEL DIGITAL-TO-ANALOG CONVERTER WITH POWER DOWN |
| 中文描述： | 2.7 V至5.5 V 12位并行數(shù)字至模擬轉(zhuǎn)換器與電源向下 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 291K |
| 代理商： | TLV5613DW |
TLV5613
2.7 V TO 5.5 V 12-BIT PARALLEL DIGITAL-TO-ANALOG CONVERTER
WITH POWER DOWN
SLAS174A – DECEMBER 1997 – REVISED JULY 1998
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
software
In the following example, the code generates a waveform at 500 KSPS with 500 samples stored in a table within
the program memory space of the microcontroller. The period of the waveform is 1 ms.
The waveform data is located in the program memory space from address 01000h to address 013E8h
(2
×
500 = 1000 = 03E8h) beginning with the MSW of the first 16-bit word (the 4 MSBs are ignored), followed
by the LSW. Two bytes are required for each DAC word (the table is not shown in the code example).
The program consists of two parts:
A main routine, which is executed after reset and which initializes the timer and the interrupt system of the
microcontroller.
An interrupt service routine, which reads a new value from the waveform table and writes it to the DAC.
This example uses timer 0 in mode 3 (8-bit timer with auto reload). The clock of the timer is derived from the
system clock and has a frequency of f
osc
/12. The timer overrun frequency f
tim
is given by the following equation:
fOSC
12(256–Reload)and the reload value is given by Reload
ftim
256–
fOSC
12 ftim
To get a timer overrun frequency of 500 kHz at a system clock of 24 MHz, the reload value is:
Reload
256 –
24
12
0.5
256–4
252
0FCh
With this value, the timer generates an interrupt every 2
μ
s. The corresponding service routine
T0_isr
reads
a sample from program memory and writes it to the DAC. First, it disables the update of the DAC output by
clearing the RLDAC bit in the control register. Then it reads the MSW and the LSW from the waveform table
and stores it in the MSW and LSW register of the TLV5613. The write cycle is completed by setting the RLDAC
bit, which updates the DAC output. At the end of the interrupt service routine, the pointer to the waveform
samples is increased and is checked to determine if it has reached the end of the table. If the pointer has reached
the end of the table, the pointer is set to the start address of the table.
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| TLV5613PW | 2.7 V TO 5.5 V 12-BIT PARALLEL DIGITAL-TO-ANALOG CONVERTER WITH POWER DOWN |
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