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參數(shù)資料
| 型號： | LTC1402IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Serial 12-Bit, 2.2Msps Sampling ADC with Shutdown |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大小： | 251K |
| 代理商： | LTC1402IGN |
17
LTC1402
APPLICATIO
S I
N
FOR
ATIO
U
HARDWARE INTERFACE TO TMS320C54x
The LTC1402 is a serial output ADC whose interface has
been designed for high speed buffered serial ports in fast
digital signal processors (DSPs). Figure 13 shows an
example of this interface using a TMS320C54X.
The buffered serial port in the TMS320C54x has direct
access to a 2kB segment of memory. The ADC’s serial data
can be collected in two alternating 1kB segments, in real
time, at the full 2.2Msps conversion rate of the LTC1402.
The DSP assembly code sets frame sync mode at the BFSR
pin to accept an external positive going pulse, and the
serial clock at the BCLKR pin to accept an external positive
W
U
Figure 13. DSP Serial Interface to TMS320C54x
1402 F13
11
16
15
10
9
3-WIRE SERIAL
INTERFACE LINK
OV
DD
CONV
SCK
LTC1402
D
OUT
V
CC
BFSR
BCLKR
TMS320C54x
BDR
OGND
CONV
CLK
5V
REF
B11
B10
edge clock. Buffers near the LTC1402 may be added to
drive long tracks to the DSP to prevent corruption of the
signal to LTC1402. This configuration is adequate to
traverse a typical system board, but source resistors at the
buffer outputs, and termination resistors at the DSP may
be needed to match the characteristic impedance of very
long transmission lines. If you need to terminate the D
OUT
transmission line, buffer it first with one or two 74ACxx
gates. The TTL threshold inputs of the DSP port respond
properly to the 2.5V swing of the terminated transmission
lines. The OV
DD
supply output driver supply voltage can be
driven directly from the DSP.
; ***************************************************************************
; Files: BSP2KB.ASM ->
; 2kbyte collection into DSKPlus TMS320C542 with Serial Port interface to LTC1402
; first element at 1024, last element at 1023, two middle elements at 2047 and 0000
; bipolar mode
; ***************************************************************************
.width
160
.length
110
.title “sineb0 BSP in auto buffer mode”
.mmregs
.setsect “.text”,
0x500,0
;Set address of executable
.setsect “vectors”, 0x180,0
;Set address of incoming 1402 data
.setsect “buffer”, 0x800,0
;Set address of BSP buffer for clearing
.setsect “result”,
0x1800,0
;Set address of result for clearing
.text
;.text marks start of code
start: ;Make sure /PWRDWN is low at J1-9 to turn off AC01 adc
tim=#0fh
prd=#0fh
tcr = #10h
; stop timer
tspc = #0h
; stop TDM serial port to AC01
pmst = #01a0h ; set up iptr. Processor Mode STatus register
sp = #0700h
; init stack pointer.
dp = #0
; data page
ar2 = #1800h
; pointer to computed receive buffer.
ar3 = #0800h
; pointer to Buffered Serial Port receive buffer
ar4 = #0h
; reset record counter
call sineinit
; Double clutch the initialization to insure a proper
sinepeek:
; insert debugger break here to view results
call sineinit
; reset. The external frame sync must occur 2.5 clocks
; or more after the port comes out of reset.
wait goto wait
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