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參數(shù)資料
| 型號(hào)： | TLV5614IDR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 9 us SETTLING TIME, 12-BIT DAC, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 15/34頁 |
| 文件大?。?/td> | 737K |
| 代理商： | TLV5614IDR |
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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
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Processor:
80C51
;
; Description:
;
; This program generates a differential in-phase
(sine) on (OUTA–OUTB) ; and it’s quadrature (cosine)
as a differential signal on (OUTC–OUTD).
;
1998, Texas Instruments Inc.
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
NAME
GENIQ
MAIN
SEGMENT
CODE
ISR
SEGMENT
CODE
SINTBL SEGMENT
CODE
VAR1
SEGMENT
DATA
STACK
SEGMENT
IDATA
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Code start at address 0, jump to start
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
CSEG
AT
0
LJMP
start
; Execution starts at address 0 on power–up.
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Code in the timer0 interrupt vector
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
CSEG
AT
0BH
LJMP
timer0isr
; Jump vector for timer 0 interrupt is 000Bh
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Global variables need space allocated
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
RSEG
VAR1
temp_ptr:
DS
1
rolling_ptr: DS
1
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––;
Interrupt service routine for timer 0 interrupts
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
RSEG
ISR
timer0isr:
PUSH
PSW
PUSH
ACC
CLR
INT1
; pulse LDAC low
SETB
INT1
; to latch all 4 previous values at the same time
; 1st thing done in timer isr => fixed period
CLR
T0
; set CS low
; The signal to be output on each DAC is a sine function.
; One cycle of a sine wave is held in a table @ sinevals
; as 32 samples of msb, lsb pairs (64 bytes).
; We have ; one pointer which rolls round this table, rolling_ptr,
; incrementing by 2 bytes (1 sample) on each interrupt (at the end of
; this routine).
; The DAC samples are read at an offset to this rolling pointer:
; DAC
Function
Offset from rolling_ptr
;
A
sine
0
;
B
inverse sine
32
;
C
cosine
16
;
D
inverse cosine48
MOV
DPTR,#sinevals; set DPTR to the start of the table
; of sine signal values
MOV
R7,rolling_ptr; R7 holds the pointer
;into the sine table
MOV
A,R7
; get DAC A msb
MOVC
A,@A+DPTR
; msb of DAC A is in the ACC
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