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參數(shù)資料
型號(hào)： TLV5614IDRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： DAC
英文描述： SERIAL INPUT LOADING, 9 us SETTLING TIME, 12-BIT DAC, PDSO16
封裝： GREEN, PLASTIC, MS-012AC, SOIC-16
文件頁(yè)數(shù)： 8/34頁(yè)
文件大小： 737K
代理商： TLV5614IDRG4
TLV5614
2.7-V TO 5.5-V 12-BIT 3-
S QUADRUPLE DIGITAL-TO-ANALOG CONVERTERS
WITH POWER DOWN
SLAS188B – SEPTEMBER 1998 – REVISED APRIL 2003
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Processor:
TMS320C203 runnning at 40 MHz
;
; Description:
;
; This program generates a differential in–phase (sine) on (OUTA–OUTB) and it’s
; quadrature (cosine) as a differential signal on (OUTC–OUTD).
;
; The DAC codes for the signal samples are stored as a table of 64 12–bit values,
; describing 2 periods of a sine function. A rolling pointer is used to address the
; table location in the first period of this waveform, from which the DAC A samples
; are read. The samples for the other 3 DACs are read at an offset to this rolling
; pointer:
;
DAC
Function
Offset from rolling pointer
;
A
sine
0
;
B
inverse sine
16
;
C
cosine
8
;
D
inverse cosine24
;
; The on–chip timer is used to generate interrupts at a fixed rate. The interrupt
; service routine first pulses LDAC low to update all DACs simultaneously
; with the values which were written to them in the previous interrupt. Then all
; 4 DAC values are fetched and written out through the synchronous serial interface
; Finally, the rolling pointer is incremented to address the next sample, ready for
; the next interrupt.
;
1998, Texas Instruments Inc.
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
;–––––––––––––––––––––––––––––– I/O and memory mapped regs –––––––––––––––––––––––––––––
.include ”regs.asm”
;–––––––jump vectors –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
.ps
0h
b
start
b
int1
b
int23
b
timer_isr;
––––––––––– variables –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
temp
.equ
0060h
r_ptr
.equ
0061h
iosr_stat
.equ
0062h
DACa_ptr
.equ
0063h
DACb_ptr
.equ
0064h
DACc_ptr
.equ
0065h
DACd_ptr
.equ
0066h
;–––––––––––constants––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; DAC control bits to be OR’ed onto data
; all fast mode
DACa_control .equ
01000h
DACb_control .equ
05000h
DACc_control .equ
09000h
DACd_control .equ
0d000h
;––––––––––– tables ––––––––––––––––––––––––––––––––
.ds
02000h
sinevals
.word
00800h
.word
0097Ch
.word
00AE9h
.word
00C3Ah
.word
00D61h
.word
00E53h
.word
00F07h
.word
00F76h
.word
00F9Ch
.word
00F76h
.word
00F07h
.word
00E53h
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