參數(shù)資料
型號(hào): TLV5604ID
廠商: TEXAS INSTRUMENTS INC
元件分類: DAC
英文描述: SERIAL INPUT LOADING, 8.5 us SETTLING TIME, 10-BIT DAC, PDSO16
封裝: GREEN, PLASTIC, SOIC-16
文件頁數(shù): 7/31頁
文件大小: 572K
代理商: TLV5604ID
TLV5604
2.7-V TO 5.5-V 10-BIT 3-
S QUADRUPLE DIGITAL-TO-ANALOG CONVERTERS
WITH POWER DOWN
SLAS176B – DECEMBER 1997 – REVISED JULY 2002
15
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 cosine
24
;
; 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 Incorporated
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––;
; ––––––––––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
0061
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
.word
00D61h
.word
00C3Ah
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