参数资料
型号: AD420ARZ-32
厂商: Analog Devices Inc
文件页数: 5/16页
文件大小: 0K
描述: IC DAC SRL 16BIT 24-SOIC
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 31
设置时间: 2.5µs
位数: 16
数据接口: 串行
转换器数目: 1
电压电源: 单电源
功率耗散(最大): 176mW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-SOIC(0.295",7.50mm 宽)
供应商设备封装: 24-SOIC W
包装: 管件
输出数目和类型: 2 电流,双极
采样率(每秒): 400
产品目录页面: 781 (CN2011-ZH PDF)
AD420
Rev. H | Page 13 of 16
EXTERNAL BOOST FUNCTION
The external boost transistor reduces the power dissipated in
the AD420 by reducing the current flowing in the on-chip
output transistor (dividing it by the current gain of the external
circuit). A discrete NPN transistor with a breakdown voltage,
BVCEO, greater than 32 V can be used as shown in Figure 13.
00
49
4-
01
3
AD420
MJD31C
OR
2N3053
19
BOOST
IOUT
0.022F
1k
RLOAD
18
Figure 13. External Boost Configuration
The external boost capability has been developed for those
users who may wish to use the AD420, in the SOIC package, at
the extremes of the supply voltage, load current, and
temperature range. The PDIP package (because of its lower
thermal resistance) will operate safely over the entire specified
voltage, temperature, and load current ranges without the boost
transistor. The plot in Figure 14 shows the safe operating region
for both package types. The boost transistor can also be used to
reduce the amount of temperature induced drift in the part.
This will minimize the temperature induced drift of the on-chip
voltage reference, which improves drift and linearity.
00
49
4-
0
14
28V
20V
12V
4V
–60
–40
–20
0
20
40
60
80
100
TEMPERATURE (°C)
25V
AD420 OR AD420-32
32V
VCC
WHEN USING SOIC PACKAGED DEVICES,
AN EXTERNAL BOOST TRANSISTOR IS
REQUIRED FOR OPERATION IN THIS AREA.
Figure 14. Safe Operating Region
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