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參數(shù)資料
| 型號： | EVAL-AD5934EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 250 kSPS, 12-Bit Impedance Converter, Network Analyzer |
| 中文描述： | 250 kSPS的，12位阻抗轉(zhuǎn)換器，網(wǎng)絡(luò)分析儀 |
| 文件頁數(shù)： | 28/32頁 |
| 文件大?。?/td> | 335K |
| 代理商： | EVAL-AD5934EB |
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AD5934
CHOOSING A REFERENCE FOR THE AD5934
To achieve the best performance from the AD5934, thought
should be given to the choice of a precision voltage reference.
The AD5934 has three reference inputs: (AVDD1, AVDD2, and
DVDD). It is recommended that the voltage on these reference
inputs be run from the same voltage supply.
Rev. 0 | Page 28 of 32
There are four possible sources of error that should be
considered when choosing a voltage reference for high accuracy
applications: initial accuracy, ppm drift, long-term drift, and
output voltage noise. To minimize these errors, a reference with
high initial accuracy is preferred. Also, choosing a reference
with an output trim adjustment, such as a device in the
ADR43X family, allows a system designer to trim system errors
by setting a reference voltage to a voltage other than the
nominal. The trim adjustment can also be used at temperature
to trim out any error.
Because the supply current required by the AD5934 is
extremely low, the parts are ideal for low supply applications.
The ADR395 voltage reference is recommended in this case.
This requires less than 100 μA of quiescent current. It also
provides very good noise performance at 8 μV p-p in the
0.1 Hz to 10 Hz range.
Long-term drift is a measure of how much the reference drifts
over time. A reference with a tight long-term drift specification
ensures that the overall solution remains stable during its entire
lifetime. A reference with a tight temperature coefficient
specification should be chosen to reduce temperature
dependence of the system output voltage on ambient
conditions.
In high accuracy applications, which have a relatively low noise
budget, reference output voltage noise needs to be considered.
Choosing a reference with as low an output noise voltage as
practical for the system noise resolution required is important.
Precision voltage references such as the ADR433 produce low
output noise in the 0.1 Hz to 10 Hz region. Examples of some
recommended precision references for use as supply to the
AD5934 are shown in Table 19.
Table 19. List of Precision References for theAD5934
Part No.
Initial Accuracy (mV max)
ADR433B
±1.4
ADR433A
±4.0
ADR434B
±1.5
ADR434A
±5
ADR435B
±2
ADR435A
±6
ADR439B
±2
ADR439A
±5.4
Output Voltage (V)
3. 0
3. 0
4. 096
4. 096
5.0
5.0
4.5
4.5
Temp. Drift (ppm/°C max)
3
10
3
10
3
10
3
10
0.1 Hz to 10 Hz Noise (μV p-p typ)
3.75
3.75
6.25
6.25
8
8
7.5
7.5
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