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參數(shù)資料
| 型號： | AD8303AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | +3 V, Dual, Serial Input Complete 12-Bit DAC |
| 中文描述： | DUAL, SERIAL INPUT LOADING, 14 us SETTLING TIME, 12-BIT DAC, PDSO14 |
| 封裝： | 1.75 MM HEIGHT, SOIC-14 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 414K |
| 代理商： | AD8303AR |
AD8303
REV. 0
–14–
;AD8303.ASM
;
; This subroutine loads an AD8303 shift register with a 12-bit
; DAC value, and transfers the value to DAC A or DAC B.
; The DAC value is stored at location DAC-VAL1 (MSB) and DAC_VAL0 (LSB)
; The DAC address (A or B) is stored at DAC_ADDR, (b0=0 for A, b1=0 for B)
;
; Primary controls
$MOD51
$TITLE(AD8303 Interface, Using the Serial Port in Mode 0)
;
; Variable declarations
;
PORT1 DATA 90H ;SFR register for port 1
DAC_VAL0 DATA 40H ;LSBs of 12-bit DAC Value
DAC_VAL1 DATA 41H ; MSBs of DAC Value
DAC_ADDR DATA 42H ;DAC address, format is:
; 1,1,1,1,1,1,LDB,LDA
; Set bit low to select DAC
LOOPCOUNT DATA 43H ;Count loops for byte swap
SHIFTREG DATA 44H ;Shift reg. for byte swap
SENDBYTE DATA 45H ; Destination reg. for SR
;
ORG 100H ;arbitrary starting address
DO_8303: CLR SCON.7 ;set serial
CLR SCON.6 ; data mode 0
CLR SCON.5 ;Clr SM2 for mode 0
CLR SCON.1 ;Clr the transmit flag
MOV SHIFTREG,DAC_VAL1 ;Get Most Significant Byte
ACALL SEND_IT ; send to AD8303
MOV SHIFTREG,DAC_VAL0 ;Get Least Significant Byte
ACALL SEND_IT ; send it to the AD8303
MOV A,PORT1 ;Get I/O port contents
ANL A,DAC_ADDR ;Clr LDA/LDB, other bits unchanged
MOV PORT1,A ;Send to I/O port
ORL A,#00000011B ;Set LDA and LDB high
MOV PORT1,A ;Send to I/O port
RET ;Done
;
;Convert the byte to LSB-first format and send it to the AD8303
SEND_IT: MOV LOOPCOUNT,#8 ;Shift 8 bits
BYTESWAP: MOV A,SHIFTREG ;Get source byte
RLC A ;rotate MSB to carry
MOV SHIFTREG,A ;Save new source byte
MOV A,SENDBYTE ;get destination byte
RRC A ;Move carry into MSB
MOV SENDBYTE,A ;Save
DJNZ LOOPCOUNT,BYTESWAP ;Done
MOV SBUF,SENDBYTE ;Send the byte
SEND_WAIT: JNB SCON.1,SEND_WAIT ;Wait until 8 bits are send
CLR SCON.1 ;Clear the serial flag
RET ;Done
END
Figure 35. Software Listing for the AD8303-80CL51 Interface
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相關代理商/技術參數(shù) |
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|---|---|
| AD8303AR-REEL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 14-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:IC,DUAL 12BIT,+3V,COMPLETE DAC,TAPE&REEL - Tape and Reel |
| AD8303ARZ-REEL | 功能描述:IC DAC 12BIT SERIAL 14SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:- 標準包裝:2,400 系列:- 設置時間:- 位數(shù):18 數(shù)據(jù)接口:串行 轉換器數(shù)目:3 電壓電源:模擬和數(shù)字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應商設備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率（每秒）:* |
| AD8303JRU | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 14-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:IC,DUAL 12BIT,+3V,COMPLETE DAC - Bulk |
| AD8303JRU-REEL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 14-Pin TSSOP T/R |
| AD8303JRUZ | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 14-Pin TSSOP |
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