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TLV5614MPWREP Datasheet(PDF) 16 Page - Texas Instruments |
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TLV5614MPWREP Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 32 page  TLV5614EP 2.7V TO 5.5V 12BIT 3 µs QUADRUPLE DIGITALTOANALOG CONVERTER WITH POWER DOWN SGLS355 − JUNE 2006 16 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION ;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− ; Processor: TMS320C203 running 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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