TLV5604CPWR datasheet(15/31 Pages) TI

15 / 31 page

TLV5604

2.7-V TO 5.5-V 10-BIT 3-

µS QUADRUPLE DIGITAL-TO-ANALOG CONVERTERS

WITH POWER DOWN

SLAS176B – DECEMBER 1997 – REVISED JULY 2002

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;

;

sine

;

inverse sine

;

cosine

;

inverse cosine

;

; 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

start

int1

int23

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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