CN221406396U - Digital potential device - Google Patents
Digital potential device Download PDFInfo
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- CN221406396U CN221406396U CN202323437581.9U CN202323437581U CN221406396U CN 221406396 U CN221406396 U CN 221406396U CN 202323437581 U CN202323437581 U CN 202323437581U CN 221406396 U CN221406396 U CN 221406396U
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Abstract
The utility model relates to the technical field of integrated circuits and discloses a digital potentiometer device, which comprises at least one first digital potentiometer and at least one second digital potentiometer, wherein the resolution of the first digital potentiometer is higher than that of the second digital potentiometer, and the first digital potentiometer is greatly influenced by temperature than the second digital potentiometer; at least one first digital potentiometer is connected in series with at least one second digital potentiometer; the resistance value of the output of the first digital potentiometer is smaller than that of the output of the second digital potentiometer. According to the utility model, the first digital potentiometer with high precision and high temperature drift is connected in series with the second digital potentiometer with low precision and low temperature drift, the second digital potentiometer with low precision and low temperature drift bears most resistance value, the first digital potentiometer with high precision and high temperature drift bears a small part resistance value, and the first digital potentiometer can carry out fine adjustment on resistance value, so that the digital potentiometer with high precision and low temperature drift is obtained.
Description
Technical Field
The utility model relates to the field of integrated circuits, in particular to a digital potential device.
Background
The digital potentiometer is an integrated circuit which can generate a resistor output through digital signal control, and the internal tap of the circuit is controlled through the digital signal, so that the size of the resistor output is adjusted. The digital potentiometer has the advantages of small volume, programmability, long service life, vibration resistance and the like. The precision, i.e. resolution, of the digital potentiometer is calculated by dividing the total resistance of the digital potentiometer by the number of taps, and the resolution of the digital potentiometer is higher as the resistance is smaller.
Digital potentiometers are commonly used for voltage division or as a digitally controlled slide rheostat in electrical circuits, and for the application of digital potentiometers herein, digital potentiometers are used as a slide rheostat.
The digital potentiometer on the market is mainly produced by ADI and TI, and the digital potentiometers of ADI and TI have defects, such as the resistance value of the digital potentiometer of AD5252BRUZ of ADI, which changes under the influence of temperature, is far greater than the resistance value of TPL0401A of TI, and the changing resistance value is the temperature drift of the digital potentiometer. When the AD5252BRUZ10 is applied in the occasion of larger environmental temperature change, the temperature has larger influence on the resistance value of the AD5252BRUZ, and when the TPL0401A is used, the resolution of the TPL0401A is far smaller than that of the AD5252BRUZ, and the resolution can not meet the requirement.
Disclosure of utility model
In view of this, the present utility model provides a digital potentiometer device to solve the problem that the digital potentiometer with high resolution has large temperature drift and small temperature drift in the market has low resolution.
The utility model provides a digital potentiometer device, which comprises at least one first digital potentiometer and at least one second digital potentiometer, wherein the resolution ratio of the first digital potentiometer is higher than that of the second digital potentiometer, and the first digital potentiometer is influenced by temperature more than that of the second digital potentiometer;
at least one first digital potentiometer is connected in series with at least one second digital potentiometer;
The resistance value of the resistor output by the first digital potentiometer is smaller than that of the resistor output by the second digital potentiometer; the first digital potentiometer is used for fine adjustment of the resistance.
In some embodiments, the at least one first digital potentiometer comprises a plurality of first digital potentiometers connected in series and/or parallel to form a branch, one branch being connected in series with the at least one second digital potentiometer.
In some embodiments, the at least one second digital potentiometer comprises a plurality of second digital potentiometers; a plurality of second digital potentiometers are connected in series and/or in parallel to form another branch; at least one first digital potentiometer is connected in series with the other branch.
In some embodiments, the at least one first digital potentiometer comprises a plurality of first digital potentiometers and the at least one second digital potentiometer comprises a plurality of second digital potentiometers; a plurality of first digital potentiometers are connected in series and/or in parallel to form one branch, and a plurality of second digital potentiometers are connected in series and/or in parallel to form another branch; one branch and the other branch are connected in series.
In some embodiments, the first digital potentiometer is AD5252.
In some embodiments, the second digital potentiometer is TPL0401A.
In some embodiments, the first digital potentiometer is 2 and the second digital potentiometer is 1; the first digital potentiometer is arranged in parallel.
In some embodiments, the first digital potentiometer is 1, the second digital potentiometer is 2, and the second digital potentiometers are arranged in series.
In some embodiments, the first digital potentiometer is 2 and the second digital potentiometer is 2; the first digital potentiometers are arranged in parallel, and the second digital potentiometers are arranged in series.
In some embodiments, the first digital potentiometer is 2 and the second digital potentiometer is 2; the first digital potentiometers are arranged in parallel, and the second digital potentiometers are arranged in parallel.
The beneficial effects are that: according to the utility model, the first digital potentiometer with high precision and high temperature drift is connected in series with the second digital potentiometer with low precision and low temperature drift, the second digital potentiometer with low precision and low temperature drift bears most resistance value, the first digital potentiometer with high precision and high temperature drift bears a small part resistance value, and the first digital potentiometer can carry out fine adjustment on resistance value, so that the digital potentiometer with high precision and low temperature drift is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a digital potential apparatus according to an embodiment of the present utility model;
Fig. 2 is a circuit configuration diagram example of a digital potential apparatus according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another digital potential apparatus according to an embodiment of the present utility model;
fig. 4 is a circuit configuration diagram example of another digital potential apparatus according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In this embodiment, there is provided a digital potential apparatus, as shown in fig. 1, including: at least one first digital potentiometer 1 and at least one second digital potentiometer 2.
As shown in fig. 1, the accuracy of the first digital potentiometer 1 is higher than that of the second digital potentiometer 2, and the resolution of the first digital potentiometer 1 is more susceptible to temperature than that of the second digital potentiometer 2; at least one first digital potentiometer 1 is connected in series with at least one second digital potentiometer 2.
Specifically, in this embodiment, the first digital potentiometer 1 with high precision and high temperature drift and the second digital potentiometer 2 with low precision and low temperature drift are connected in series, and the resistance of the output resistor is the sum of the resistances of all the first digital potentiometer 1 and the second digital potentiometer 2.
Specifically, the resistance value output by the first digital potentiometer 1 is smaller than the resistance value output by the second digital potentiometer 2; the first digital potentiometer 1 is used for fine adjustment of the resistance.
Specifically, when the resistance of the output resistor is required to be larger, the first digital potentiometer 1 bears a small part of the resistance, the second digital potentiometer 2 bears a large part of the resistance, and the actual temperature drift value of the digital potentiometer device is small because the first digital potentiometer 1 floats at high temperature but only bears a small part of the resistance.
In some embodiments, the first digital potentiometer 1 uses an AD5252 chip of ADI and the second digital potentiometer 2 uses a TPL0401A chip of TI, and the digital potentiometer device of the present embodiment includes a first digital potentiometer 1 and a second digital potentiometer 2 as an example for illustration, which is specifically as follows:
The AD5252 has two resistance values of AD5252BRUZ 11 k and AD5252BRUZ10 k, and the two resistance values are 256-tap digital potentiometers, the resolution is respectively equal to about 4Ω (1 k/256), 39Ω (10 k/256) but the temperature coefficient of the AD5252 digital potentiometers is 650ppm/°c, namely, the resistance value of the digital potentiometers changes 650 parts per million when the temperature changes once, and the temperature influence is larger; TPL0401A is a 128-tap digital potentiometer with a resistance value of 10k, the resolution is about 78Ω (10 k/128), the temperature coefficient is 22 ppm/DEG C, and the resolution is low although the temperature influence is small.
In some embodiments, as shown in fig. 3, two AD5252BRUZ with 1k resistance values are connected in parallel, after two digital potentiometers are connected in parallel, each digital potentiometer changes by one tap, the resistance value changes by 4Ω, and the resistance changes to 2Ω after 4Ω is connected in parallel, so that the resolution doubles to 2Ω. The resolution of the digital potentiometer can be further improved by connecting the first digital potentiometer 1 in parallel. In some embodiments, a digital potentiometer is used to obtain a low temperature drift 5100Ω resistance, and a temperature change of 20deg.C can change the resistance using only one AD5252BRUZ10If only one TPL0401A is used, the accurate 5100Ω cannot be achieved due to the low resolution, and the method of connecting the low-temperature-drift low-resolution digital potentiometer (the second digital potentiometer 2) and the high-temperature-drift high-resolution digital potentiometer (the first digital potentiometer 1) in series, that is, the method of connecting the TPL0401A and the AD5252BRUZ1 in series can be adopted.
As shown in FIG. 2, at this time, the TPL0401A is 5000 Ω, the AD5252BRUZ A is 100 Ω, most of the resistance is equal to the resistance of the TPL0401A, and the other part is equal to the resistance of the AD5252BRUZ1, so that the resistance can be finely tuned by using the AD5252BRUZ1 to obtain the desired resistance, and since the TPL0401A occupies most of the total resistance, the temperature drift of 20 ℃ after the two digital potentiometers are combined is The temperature drift value is much smaller than the temperature drift (66.3 Ω) of AD5252BRUZ using a single 10k resistance value, and since fine tuning of the resistance value can be performed using AD5252BRUZ1 at this time, the combined resolution of the two potentiometers is also much higher than the case of using a single TPL 0401A.
It can be understood that the organization of the first digital potentiometer and the second digital potentiometer is not limited to 100Ω and 5000 Ω, and can be adjusted according to the requirement.
In some embodiments, as shown in fig. 4, when a plurality of first digital potentiometers 1 are included, the plurality of first digital potentiometers 1 are connected in series and/or in parallel to form one branch, and the plurality of second digital potentiometers 2 are connected in series and/or in parallel to form one branch; the two branches are connected in series.
Specifically, a plurality of first digital potentiometers 1 may be used in series to obtain a larger resistance adjustment range, or the first digital potentiometers 1 may be connected in parallel to obtain a higher resolution, or part of the first digital potentiometers 1 may be connected in series, and part of the first digital potentiometers 1 may be connected in parallel to simultaneously achieve a larger adjustment range and an increase in resolution; the plurality of second digital potentiometers 2 are connected in series, or the second digital potentiometers 2 are connected in parallel, or part of the second digital potentiometers 2 are connected in series, and part of the second digital potentiometers 2 are connected in parallel, so that a larger resistance value which is actually needed is obtained.
Specifically, in the structure shown in fig. 4, in order to achieve high-precision low-temperature drift, a branch formed by the first digital potentiometer 1 bears a small part of resistance, and another branch formed by the second digital potentiometer 2 bears a large part of resistance.
In some embodiments, the formed branch of the first digital potentiometer 1 may be formed by two first digital potentiometers 1 connected in series or in parallel; the branch formed by the second digital potentiometers 2 can be formed by connecting two second digital potentiometers 2 in series or in parallel; the two branches are connected in series. It is to be understood that the two branches can also each be connected to only one second digital potentiometer 2 and one first digital potentiometer 1 to form the digital potentiometer arrangement.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.
Claims (10)
1. A digital potentiometer, comprising: at least one first digital potentiometer and at least one second digital potentiometer, wherein the resolution of the first digital potentiometer is higher than that of the second digital potentiometer, and the first digital potentiometer is greatly influenced by temperature than the second digital potentiometer;
at least one of the first digital potentiometers is connected in series with at least one of the second digital potentiometers;
the resistance value output by the first digital potentiometer is smaller than the resistance value output by the second digital potentiometer; the first digital potentiometer is used for fine adjustment of the resistance value.
2. The digital potentiometer according to claim 1, wherein at least one of the first digital potentiometers comprises a plurality of first digital potentiometers connected in series and/or parallel to form a branch, said branch being connected in series with at least one of the second digital potentiometers.
3. The digital potentiometer according to claim 1, wherein at least one of the second digital potentiometers comprises a plurality of second digital potentiometers; a plurality of second digital potentiometers are connected in series and/or in parallel to form another branch; at least one of the first digital potentiometers is connected in series with the other branch.
4. The digital potentiometer according to claim 1, wherein at least one of the first digital potentiometers comprises a plurality of first digital potentiometers and at least one of the second digital potentiometers comprises a plurality of second digital potentiometers; a plurality of first digital potentiometers are connected in series and/or in parallel to form one branch, and a plurality of second digital potentiometers are connected in series and/or in parallel to form another branch; the one branch and the other branch are connected in series.
5. The digital potentiometer according to claim 1, wherein the first digital potentiometer is AD5252.
6. The digital potentiometer according to claim 1, wherein the second digital potentiometer is TPL0401A.
7. The digital potentiometer according to claim 2, wherein the number of the first digital potentiometers is 2 and the number of the second digital potentiometers is 1; and 2 first digital potentiometers are arranged in parallel.
8. A digital potentiometer according to claim 3, wherein the number of the first digital potentiometer is 1, the number of the second digital potentiometer is 2, and the number of the second digital potentiometers is 2, and the second digital potentiometers are arranged in series.
9. The digital potentiometer according to claim 4, wherein the number of the first digital potentiometer is 2, and the number of the second digital potentiometer is 2; 2 first digital potentiometers are arranged in parallel, and 2 second digital potentiometers are arranged in series.
10. The digital potentiometer according to claim 4, wherein the number of the first digital potentiometer is 2, and the number of the second digital potentiometer is 2; 2 first digital potentiometers are arranged in parallel, and 2 second digital potentiometers are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323437581.9U CN221406396U (en) | 2023-12-15 | 2023-12-15 | Digital potential device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323437581.9U CN221406396U (en) | 2023-12-15 | 2023-12-15 | Digital potential device |
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| Publication Number | Publication Date |
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| CN221406396U true CN221406396U (en) | 2024-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202323437581.9U Active CN221406396U (en) | 2023-12-15 | 2023-12-15 | Digital potential device |
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| CN (1) | CN221406396U (en) |
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2023
- 2023-12-15 CN CN202323437581.9U patent/CN221406396U/en active Active
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