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ADA4610-1ARJZ-R2 其他数据使用手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
放大器、缓冲器
封装:
SOT-23-5
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
原理图在P8
技术参数、封装参数在P4
型号编号列表在P4
导航目录
ADA4610-1ARJZ-R2数据手册
Page:
of 18 Go
若手册格式错乱，请下载阅览PDF原文件
Application Note AN-1291
Rev. A | Page 5 of 18
Q: Regarding the specification on resistor differential nonlinearity
(R-DNL), I am concerned only with relative adjustments. What if
I am not concerned with the actual value of the resistor in the
digital potentiometer, but need it to be monotonic?
A: For a digital potentiometer that is in rheostat mode, there are
two specifications known as resistor integral nonlinearity (R-INL)
and R-DNL, respectively. INL is the maximum deviation between
the ideal output of a digital-to-analog converter (DAC) and the
actual output level. R-INL is the deviation from an ideal value
measured between the maximum resistance wiper position and
the minimum resistance wiper position. DNL is the maximum
deviation between two consecutive codes over the DAC transfer
function. R-DNL measures the relative step change from the ideal
between successive tap positions.
All Analog Devices digital potentiometers are guaranteed
monotonic.
Q: Is there analog crosstalk between Ch1 and Ch2 of a dual
digital potentiometer such that a sine wave applied to Ch1
occurs in Ch2 as well?
A: Yes. The relevant product data sheet details such performance.
The performance is typically specified at −70 dB. Figure 3 is an
example of analog crosstalk.
V
W1
V
W2
12052-004
Figure 3. Analog Crosstalk
Q: If Ch1 is programmed from zero to full scale, should the
user expect Ch2 to be disturbed?
A: This process is digital step response crosstalk, which is
different from analog crosstalk, and the relevant product data
sheet details this information. Digital step response crosstalk is
typically in the range of 5 nV/sec to 10 nV/sec. Figure 4 shows
an example of digital crosstalk.
V
W1
V
W2
12052-005
Figure 4. Digital Step Response Crosstalk
Q: What is digital feedthrough?
A: Digital feedthrough is the amount of noise from clock or data
coupled into the output. It is usually very small (low nV/sec range).
Figure 5 shows an example of digital feedthrough.
SCL
V
W
12052-006
Figure 5. Digital Feedthrough
Q: How is the total harmonic distortion (THD) performance of
the digital potentiometer?
A: THD performance is dependent on both code and V
DD
.
Typically, THD performance is in the range of −86.02 dB to
−60 dB, but see the relevant product data sheet for specific
performance. The best THD performance is achieved when the
device operates at its maximum operating voltage. THD is also
dependent on the end to end resistance. A higher end to end
resistance yields better THD values, but reduces the −3 dB
bandwidth. See the dynamic characteristics in the relevant
product data sheet for more information.
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