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參數(shù)資料
| 型號(hào)： | TLV5614IYZT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 9 us SETTLING TIME, 12-BIT DAC, UUC16 |
| 封裝： | GREEN, DIE-16 |
| 文件頁數(shù)： | 5/25頁 |
| 文件大小： | 500K |
| 代理商： | TLV5614IYZT |
www.ti.com
TLV5614IYZ INTERFACED TO TMS320C203 DSP
Hardware Interfacing
DX
CLKX
FSX
I/O0
I/O1
TMS320C203
SDIN
SCLK
FS
CS
LDAC
REF
V
DD
PD
VOUTA
VOUTB
VOUTC
VOUTD
V
SS
TLV5614IYZ
REFINAB
REFINCD
Software
SBAS401 – DECEMBER 2006
Figure 17 shows an example of how to connect the TLV5614IYZ to a TMS320C203 DSP. The serial port is
configured in burst mode, with FSX generated by the TMS320C203 to provide the frame sync (FS) input to the
TLV5614IYZ. Data is transmitted on the DX line, with the serial clock input on the CLKX line. The
general-purpose input/output port bits IO0 and IO1 are used to generate the chip select (CS) and DAC latch
update (LDAC) inputs to the TLV5614IYZ. The active low power-down (PD) is pulled high all the time to ensure
the DACs are enabled.
Figure 17. TLV5614IYZ Interfaced With TMS320C203
The application example outputs a differential in-phase (sine) signal between the VOUTA and VOUTB pins, and
its quadrature (cosine) signal as the differential signal between VOUTC and VOUTD.
The on-chip timer is used to generate interrupts at a fixed frequency. The related interrupt service routine pulses
LDAC low to update all four DACs simultaneously, then fetches and writes the next sample to all four DACs. The
samples are stored in a look-up table that describes two full periods of a sine wave.
The synchronous serial port of the DSP is used in burst mode. In this mode, the processor generates an FS
pulse preceding the MSB of every data word. If multiple, contiguous words are transmitted, a violation of the
tsu(C16–FS) timing requirement occurs. To avoid this violation, the program waits until the transmission of the
previous word has been completed.
;.......................................................................................
; Processor: TMS320C203 runnning at 40 MHz
;
; Description:
;
; This program generates a differential in-phase (sine) on (OUTA-OUTB) and its 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.
13
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