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DAC0854CIWM PDF预览

DAC0854CIWM

更新时间： 2024-01-05 10:28:25
品牌 Logo 应用领域
美国国家半导体 - NSC 转换器光电二极管
页数 文件大小 规格书
14页 271K
描述
8-Bit Voltage-Output

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中文翻译

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DAC0854CIWM 技术参数

生命周期：Obsolete包装说明：DIP,
Reach Compliance Code：unknownECCN代码：3A001.A.2.C
HTS代码：8542.39.00.01风险等级：5.84
最大模拟输出电压：2.8 V最小模拟输出电压：0.3 V
转换器类型：D/A CONVERTER输入位码：BINARY
输入格式：SERIALJESD-30 代码：R-GDIP-T20
长度：24.51 mm最大线性误差 (EL)：0.3906%
位数：8功能数量：4
端子数量：20最高工作温度：125 °C
最低工作温度：-55 °C封装主体材料：CERAMIC, GLASS-SEALED
封装代码：DIP封装形状：RECTANGULAR
封装形式：IN-LINE认证状态：Not Qualified
座面最大高度：5.08 mm标称安定时间 (tstl)：2.7 µs
标称供电电压：5 V表面贴装：NO
温度等级：MILITARY端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
宽度：7.62 mmBase Number Matches：1

DAC0854CIWM 数据手册

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Applications Information  
FUNCTIONAL DESCRIPTION  
The current output I is applied to the internal output  
amplifier and converted to a voltage. The output voltage of  
OUT2  
The DAC0854 is a monolithic quad 8-bit digital-to-analog  
converter that is designed to operate on a single 5V supply.  
Each of the four units is comprised of an input register, a  
DAC register, a shift register, a current output DAC, and an  
output amplifier. In addition, the DAC0854 has an onboard  
bandgap reference and a logic unit which controls the inter-  
nal operation of the DAC0854 and interfaces it to micro-  
processors.  
each DAC is a function of V , V , and the digital input  
BIAS REF  
word, and is given by  
DATA  
511 255  
e
b
a
b
BIAS  
V
2 (V  
REF  
V
BIAS  
)
V
V
REF  
OUT  
256  
128  
128  
The output voltage range for each DAC is 0.3V–2.8V. This  
range can be achieved by using the internal 2.65V reference  
Each of the four internal 8-bit DACs uses a modified R-2R  
ladder to effect the digital-to-analog conversion (Figure 5).  
The resistances corresponding to the 2 most significant bits  
are segmented to reduce glitch energy and to improve  
matching. The bottom of the ladder has been modified so  
that the voltage across the LSB resistor is much larger than  
the input offset voltage of the buffer amplifier. The input  
digital code determines the state of the switches in the lad-  
and a voltage divider network which provides a V  
1.40V (Figure 6). In this case the DAC transfer function is  
of  
BIAS  
(DATA)  
e
a
0.310  
V
2.5  
OUT  
256  
The output impedance of any external reference that is  
used will affect the accuracy of the conversion. In order that  
this error be less than (/2 LSB, the output impedance of the  
external reference must be less than 7.8X.  
der network. The sum of currents I  
and is given by  
and I  
is fixed  
OUT1  
OUT2  
b
V
REF  
V
BIAS  
255  
256  
a
e
I
I
OUT2  
OUT1  
R
#
J
TL/H/11261–16  
FIGURE 5. Equivalent Circuit of R-2R Ladder and Output Amplifier  
TL/H/11261–17  
e
FIGURE 6. Generating a V  
BIAS  
1.40V from the Internal Reference  
9
1...6789101112...14

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