R3 and IBIAS both have a tolerance of ±" />
參數(shù)資料
型號(hào)： AD5420AREZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 19/32頁(yè)
文件大?。?/td> 0K
描述： IC DAC 16BIT 1CH SER 24TSSOP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
設(shè)計(jì)資源： Simplified 16-Bit, 4 mA-to-20 mA Output Solution Using AD5420 (CN0098)
標(biāo)準(zhǔn)包裝： 1,000
設(shè)置時(shí)間： 10µs
位數(shù)： 16
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 模擬和數(shù)字
功率耗散（最大）： 950mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm）裸露焊盤
供應(yīng)商設(shè)備封裝： 24-TSSOP 裸露焊盤
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 1 電流，單極
采樣率（每秒）： *
AD5410/AD5420
Data Sheet
Rev. F | Page 26 of 32
R3 and IBIAS both have a tolerance of ±10% and a temperature
coefficient of 30 ppm/°C. Connecting to R3SENSE rather than
AVDD avoids incorporating into R3 internal metal connections
that have large temperature coefficients and result in large
errors. See Figure 49 for a plot of R3 vs. ambient temperature
and Figure 50 for a plot of R3 vs. output current.
40.98
40.96
40.94
40.92
40.90
40.88
40.86
40.84
40.82
40.80
40.78
–40
–20
0
20
40
60
80
100
AMBIENT TEMPERATURE (°C)
R3
RE
SI
ST
ANCE
(
)
07027-
051
IOUT = 12mA
R3 = VR3/(12mA + 444A)
Figure 49. R3 Resistor Value vs. Temperature
42.0
41.8
41.6
41.4
41.2
41.0
40.8
40.6
40.4
40.2
40.0
0
5
10
15
20
25
IOUT (mA)
R3
(
)
07027-
052
TA = 25°C
R3 = VR3/(IOUT + 444A)
Figure 50. R3 Resistor Value vs. IOUT
To eliminate errors due to the tolerances of R3 and IBIAS, a two-
measurement calibration can be performed as the following
example illustrates:
1. Program code 0x1000 and measure IOUT and VR3. In this
example, the measured values are
IOUT = 1.47965 mA
VR3 = 79.55446 mV
2. Program Code 0xF000 and measure IOUT and VR3 again.
The measured values this time are
IOUT = 22.46754 mA
VR3 = 946.39628 mV
Using this information and Equation 2, two simultaneous
equations can be generated from which the values of R3 and
IBIAS can be calculated as follows:
OUT
R
BIAS
R
OUT
I
R
V
I
R
V
I
=
=
3
Simultaneous Equation 1
00147965
.
0
3
07955446
.
0
=
R
I
BIAS
Simultaneous Equation 2
02246754
.
0
3
94639628
.
0
=
R
I
BIAS
From these two equations,
302
.
41
3
=
R
Ω and
5
.
446
=
BIAS
I
μA
And Equation 2 becomes
A
V
I
R
OUT
5
.
446
302
.
41
3
=
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