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參數(shù)資料
| 型號(hào)： | TLV5614(中文) |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 2.7V to 5.5V 12-Bit 3us Quadruple Digital-to-Analog Converters With Power Down(具有掉電功能的2.7V至5.5V,12位,3微秒,四路DAC) |
| 中文描述： | 2.7V至5.5V 12位3us四倍數(shù)字模擬轉(zhuǎn)換器由于斷電（具有掉電功能的為2.7V至5.5V之間，12位，3微秒，四路援會(huì)） |
| 文件頁(yè)數(shù)： | 12/20頁(yè) |
| 文件大小： | 529K |
| 代理商： | TLV5614(中文) |
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==1999-3-18==
P&S
oo á|′μ×ó1é· YóDT1
==20-11==
P &S
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μ :
ot±±ooêD×μèa· 15o
P&Sí í :
http://www.p8s.com
D :
ooêD70020D
óê±à:
430079
μ°:
( 86) ( 027￡87493500 87493506
′
( 86) ( 027) 87491166, 87493497
3ìDòμ￥
;
; 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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