參數(shù)資料
型號(hào): EVAL-AD5421SDZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 20/36頁(yè)
文件大小: 0K
描述: BOARD EVAL FOR AD5421
標(biāo)準(zhǔn)包裝: 1
DAC 的數(shù)量: 1
位數(shù): 16
數(shù)據(jù)接口: 串行,SPI?
設(shè)置時(shí)間: 50µs
DAC 型: 電壓
工作溫度: -40°C ~ 105°C
已供物品:
已用 IC / 零件: AD5421
Data Sheet
AD5421
Rev. G | Page 27 of 36
DAC REGISTER
The DAC register is a read/write register and is addressed
as described in Table 12. The data programmed to the DAC
register determines the loop current, as shown in the Ideal
Ideal Output Transfer Function
The transfer function describing the relationship between the
data programmed to the DAC register and the loop current is
expressed by the following three equations.
For the 4 mA to 20 mA output range, the loop current can be
expressed as follows:
mA
4
2
mA
16
D
ILOOP
+
×
=
For the 3.8 mA to 21 mA output range, the loop current can be
expressed as follows:
mA
8
.
3
2
mA
2
.
17
16
D
ILOOP
+
×
=
For the 3.2 mA to 24 mA output range, the loop current can be
expressed as follows:
mA
2
.
3
2
mA
8
.
20
16
D
ILOOP
+
×
=
where D is the decimal value of the DAC register.
Table 15. DAC Register Bit Map
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
16-bit data
Table 16. Relationship of DAC Register Code to Ideal Loop Current (Gain = 65,536; Offset = 0)
DAC Register Code
Ideal Loop Current (mA)
4 mA to 20 mA Range
3.8 mA to 21 mA Range
3.2 mA to 24 mA Range
0x0000
4
3.8
3.2
0x0001
4.00024
3.80026
3.2003
0x7FFF
11.9997
12.39974
13.5997
0x8000
12
12.4
13.6
0xFFFE
19.9995
20.99947
23.9994
0xFFFF
19.9997
20.99974
23.9997
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