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参数资料
| 型号： | AD5420AREZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT 1CH SER 24TSSOP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 设计资源： | Simplified 16-Bit, 4 mA-to-20 mA Output Solution Using AD5420 (CN0098) |
| 标准包装： | 1,000 |
| 设置时间： | 10µs |
| 位数： | 16 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字 |
| 功率耗散（最大）： | 950mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 1 电流，单极 |
| 采样率（每秒）： | * |
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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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