DVDD AVDD REF IN CS DATA OUT SCLK DATA " />
參數(shù)資料
型號(hào): AD421BRZRL7
廠商: Analog Devices Inc
文件頁數(shù): 4/14頁
文件大?。?/td> 0K
描述: IC DAC 16BIT LOOP 4-20MA 16SOIC
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝: 1
設(shè)置時(shí)間: 8ms
位數(shù): 16
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
功率耗散(最大): 450mW
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC W
包裝: 標(biāo)準(zhǔn)包裝
輸出數(shù)目和類型: 1 電流,單極
其它名稱: AD421BRZRL7DKR
AD421
–12–
REV. C
DVDD AVDD
REF IN
CS
DATA OUT
SCLK
DATA IN
AGND
DGND
MCLK IN
MCLK OUT
AD7714/
AD7715
ANALOG
TO
DIGITAL
CONVERTER
SENSORS
RTD
mV
TC
REF OUT1
BOOST
VCC
LV
COMP
DRIVE
LOOP
RTN
REF OUT2
REF IN
CLOCK
LATCH
DATA
COM
C1
C2
C3
LOOP
POWER
0.01 F
DN25D
2.2 F
3.3V
1.25V
4.7 F
AMBIENT
TEMP
SENSOR
AD421
MICROCONTROLLER
VCC
GND
WAVEFORM
SHAPER
BANDPASS
FILTER
HART
MODEM
BELL 202
0.1 F
0.01 F
1k
1000pF
CC*
HT20C12/20C15
4.7 F
100k
*FOR SELECTION OF CC, REFER TO AN-534
Figure 17. AD421 in HART Transmitter Application
across R2. The ratio of R1 to R2 determines the current that
flows in the load resistor RL. IL = [1 + R1/R2]
× IPROG, where IL
is the current that flows in the load resistor RL and IPROG is the
current programmed to the AD421. R1 and R2 are external to
the AD421 and will need to be matched resistors to obtain a
highly accurate current source.
Current Source
Figure 18 shows an application circuit for the AD421 being
used as a current source. The current programmed to the
AD421 (4 mA to 20 mA) will develop a voltage across R1.
This same voltage due to negative feedback will be generated
LOOP
RTN
R2
RL
R1
C1
C2
C3
COM
VCC
LV
2.2 F
COM
DRIVE
COMP
BOOST
0.01 F
0.0033 F
LATCH
CLOCK
DATA
REF IN
REF OUT2
REF OUT1
4.7 F
COM
AD421
+5V
10k
CLOCK
LATCH
DATA
VS RETURN
5 VOLT
REGULATOR
OUT
IN
VS
COM
Figure 18. AD421 in Programmable Current Source/Sink
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