AD5421AREZ [ADI]
16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DAC; 16位，串行输入，环路供电， 4mA至20mA DAC
| 型号： | AD5421AREZ |
| 厂家： | 
ADI |
| 描述： | 16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DAC |
| 文件： | 总22页 (文件大小：2565K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IODVDD
DVDD
VLOOP
REGOUT
REGIN
AD5421
LOOP VOLTAGE
MONITOR
VOLTAGE
REGULATOR
DRIVE
FAULT
INPUT REGISTER
CONTROL LOGIC
SYNC
SCLK
SDIN
SDO
24k
RSET
16
/
16-BIT
DAC
GAIN / OFFSET
ADJUSTMENT
REGISTERS
LDAC
RANGE 0
RANGE 1
52
LOOP -
TEMP
SENSOR
VREF
ALARM CURRENT
DIRECTION
RINT/REXT
CIN
REXT1 REXT2
REFIN
REFOUT2 REFOUT1
COM
DGND
SCLK
SDIN
8
9
1
8
9
24
1
24
DB16
DB23
DB15
DB0
DB23
DB16
DB15
DB0
NOP OR REGISTER ADDRESS
D15
INPUT WORD SPECIFIES REGISTER TO BE READ
SDO
D0
UNDEFINED DATA
SPECIFIED REGISTER DATA CLOCKED OUT
SYNC
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
IODVDD
REGOUT
REGIN
SDO
3
DRIVE
SCLK
4
SYNC
VLOOP
5
SDIN
LOOP-
AD5421
TOP VIEW
(Not to Scale)
6
LDAC
REXT2
7
FAULT
REXT1
8
DVDD
CIN
9
ALARM CURRENT DIRECTION
REFOUT1
REFOUT2
REFIN
10
11
12
13
14
RINT/REXT
RANGE 0
RANGE 1
COM
REG_SEL0
REG_SEL1
REG_SEL2
COM
17.2mA
ILOOP
D 3.8mA
D 3.2mA
2N
20.8mA
ILOOP
2N
6mA
2N
ILOOP
D 4mA
DAC Re gisterData
65534
65536
DAC Re gisterData
DAC Re gisterData
DAC Re gisterData
2769
2768
2767
65536
65536
65536
DAC Re gisterData
65536
UPDATE ON SYNC HIGH
SYNC
SCLK
DIN
MSB
D23
LSB
D0
24-BIT DATA
24-BIT DATA TRANSFER - NO ERROR CHECKING
UPDATE AFTER SYNC HIGH
ONLY IF ERROR CHECK PASSED
SYNC
SCLK
SDIN
MSB
D31
LSB
D8
D0
8-BIT FCS
D7
24 BIT DATA
FAULT PINGOES HIGH IF
ERROR CHECK FAILS
FAULT
32-BIT DATA TRANSFER WITH ERROR CHECKING
REGIN
V
LOOP
19M
1M
VLOOP
RL
AD5421
LOOP -
COM
RDAC *CSLEW
T
CSLEW
5*RDAC
5ms
CSLEW
66nF
5*15220
10ms
CSLEW
30nF
5*15220
Loop Current vs. Time for a 4mA to 20mA Step
6
5
4
3
2
1
0
Rload = 250Ohm
CIN = 68nF
CIN = 133nF
-0.002
0
0.002
0.004
0.006
0.008
0.01
0.012
Time(s)
RDAC
Vto I
Circuitry
LOOP-
CIN
CSLEW
200k
REGIN
DRIVE
V
LOOP
R
L
AD5421
LOOP -
CIN
COM
CSLEW
CHART
HARTMODEM
HART_OUT
HART_IN
CHART CSLEW
CHART
4.5
Optional
Mosfet
T1
DN2540
BSP129
2.5V
200k
2µF
0.1µF
0.1µF
V
LOOP
IODVDD DVDD
RANGE 0
REGIN
REGOUT
DRIVE
RANGE 1
RL
19M
1M
ALARM CURRENT
DIRECTION
VLOOP
RINT/REXT
ADuC7060
SYNC
SCLK
SDIN
SDO
AD5421
24-Bit
S-D ADC
SENSOR
LOOP -
FAULT
LDAC
REXT1
DGND
R1
Optional
Resistor
REFOUT2
REXT2
REFIN
CIN
COM
REFOUT1
Sets Regulator
Voltage
0.1µF
16nF
4.7nF
0.1µF
HARTMODEM
VCC
HART_OUT
TXD
RXD
HART_IN
GND
RTS
CD
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
25
35
45
55
65
75
85
Ambient Temperature (°C)
53
52
51
50
49
48
47
46
25
35
45
55
65
75
85
Ambient Temperature (°C)
TJ max TA 125 105
25 mW
32
JA
TJ max PD
JA
125 (52 0.0228) 32
87
TJ max TA
125 05
27 V
ILOOP
0.0228 32
JA
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