A high-speed voltage acquisition circuit based on AD9235

Abstract

This application provides a high-speed voltage acquisition circuit based on AD9235, relating to the field of acquisition circuits. The high-speed voltage acquisition circuit based on AD9235 includes a voltage acquisition circuit and a voltage conversion circuit. Multiple voltage conversion circuits can be configured and connected in parallel. The voltage acquisition circuit includes resistors R34 and R35, capacitors C19, R28, R27, and R29, capacitors C15 and C16, a differential converter, resistors R31 and R30. This invention can acquire the voltage of the nozzle through the voltage acquisition circuit, then process the acquired voltage through the differential converter, and finally send the processed voltage to the voltage conversion circuit for conversion. Furthermore, the circuit of this invention is simple and has low acquisition and processing costs.

Description

Technical Field

[0001] This application relates to the field of data acquisition circuits, and more specifically, to a high-speed voltage acquisition circuit based on AD9235. Background Technology

[0002] In printer inkjet control, the voltage output to the printhead has a significant impact on the printing effect. How to adjust the voltage is a huge challenge in this field. Existing acquisition circuits have high acquisition costs and complex acquisition circuits when acquiring the voltage driving the printhead. Summary of the Invention

[0003] The purpose of this application is to provide a high-speed voltage acquisition circuit based on AD9235, which can solve the above-mentioned technical problems.

[0004] This application provides a high-speed voltage acquisition circuit based on AD9235, including a voltage acquisition circuit and a voltage conversion circuit. Multiple voltage conversion circuits can be configured and connected in parallel. The voltage acquisition circuit includes resistors R34 and R35, capacitor C19, R28, R27, R29, C15, C16, a differential converter, resistors R31 and R30. The first interface of the differential converter is grounded through resistors R27 and R28, and the second interface of the differential converter is grounded through... The resistor R34 is connected to an external +3.3V voltage. The second interface of the differential converter is grounded through the resistor R35 and the capacitor C19. The third interface of the differential converter is grounded through the capacitors C15 and C16. The fourth and fifth interfaces of the differential converter are both connected to the voltage conversion circuit. The fifth interface of the differential converter is grounded through the resistors R31 and R30. The sixth interface of the differential converter is connected to an external +5V voltage. The eighth interface of the differential converter is grounded through the resistor R30.

[0005] Preferably, multiple voltage acquisition circuits can be provided, with each voltage acquisition circuit corresponding to one of the multiple voltage conversion circuits.

[0006] Preferably, the differential converter is model AD8138.

[0007] Preferably, the voltage conversion circuit includes a digital-to-analog converter U1, which is model AD9235BRUZ-65.

[0008] The beneficial effects of this utility model are:

[0009] This utility model provides a high-speed voltage acquisition circuit based on AD9235, including a voltage acquisition circuit and a voltage conversion circuit. Multiple voltage conversion circuits can be configured and connected in parallel. The voltage acquisition circuit includes resistors R34 and R35, capacitors C19, R28, R27, R29, C15, C16, a differential converter, resistors R31 and R30. The first interface of the differential converter is grounded through resistors R27 and R28. The second interface of the differential converter is connected to an external +3.3V voltage through resistor R34. The second interface of the differential converter is connected to resistors R35, R28, R27, R29, C15, C16, R31, and R30 respectively. Capacitor C19 is grounded. The third interface of the differential converter is grounded through capacitors C15 and C16. The fourth and fifth interfaces of the differential converter are both connected to the voltage conversion circuit. The fifth interface of the differential converter is grounded through resistors R31 and R30. The sixth interface of the differential converter is externally connected to a +5V voltage. The eighth interface of the differential converter is grounded through resistor R30. This invention can collect the voltage of the nozzle through a voltage acquisition circuit, then process the collected voltage through a differential converter, and then send the processed voltage to the voltage conversion circuit for conversion. Moreover, the circuit of this invention is simple and the acquisition and processing cost is low. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a voltage conversion circuit diagram of the present invention;

[0012] Figure 2 This is a voltage acquisition circuit diagram of this utility model. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0015] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0016] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0017] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0019] like Figure 1-2As shown, a high-speed voltage acquisition circuit based on AD9235 includes a voltage acquisition circuit and a voltage conversion circuit. Multiple voltage conversion circuits can be configured and connected in parallel. The voltage acquisition circuit includes resistors R34 and R35, capacitors C19, R28, R27, R29, C15, C16, a differential converter, resistors R31 and R30. The first interface of the differential converter is grounded through resistors R27 and R28. The second interface of the differential converter is connected to an external +3.3V voltage through resistor R34. The second interface of the differential converter is connected to resistors R35 and C16 respectively. C19 is grounded. The third interface of the differential converter is grounded through capacitors C15 and C16. The fourth and fifth interfaces of the differential converter are both connected to the voltage conversion circuit. The fifth interface of the differential converter is grounded through resistors R31 and R30. The sixth interface of the differential converter is externally connected to a +5V voltage. The eighth interface of the differential converter is grounded through resistor R30. This invention can collect the voltage of the nozzle through a voltage acquisition circuit, then process the collected voltage through a differential converter, and then send the processed voltage to the voltage conversion circuit for conversion. Moreover, the circuit of this invention is simple and the acquisition and processing cost is low.

[0020] In this embodiment, multiple voltage acquisition circuits can be configured, with each voltage acquisition circuit corresponding one-to-one with a voltage conversion circuit; the sampling voltage range can be configured flexibly; the signal acquisition accuracy is high, without distortion, and can reproduce the signal waveform to the greatest extent possible.

[0021] In this embodiment, the differential converter is model AD8138, which processes the input signal before conversion to retain the original information of the input signal to the maximum extent without distortion; the high sampling frequency combined with the pre-processing effectively reduces the probability of acquiring noisy signals such as glitch, and the obtained data is true and reliable; when the input signal exceeds the upper and lower limits, a high level will be generated, providing a brand-new circuit for realizing nozzle protection.

[0022] In this embodiment, the voltage conversion circuit includes a digital-to-analog converter U1, model AD9235BRUZ-65, which uses a differential input signal. During conversion, it can eliminate most interference signals, thus preventing distortion when parsing the converted data. It generates a high-level signal when the input signal voltage exceeds the upper and lower limits; this signal can be used to handle many abnormal situations. The sampling point is adjustable, allowing for a delay of several clock cycles or the generation of a 90° phase difference. This method can be used for multiple ADC chips to sample the same input signal. If the budget allows, using two digital-to-analog converters U1 can increase the sampling frequency to 130MHz.

[0023] This design uses the AD9235 chip, which is powerful, with a sampling frequency of up to 65MHz, a conversion time of 7 clock cycles, and a precision of 12 bits.

[0024] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-speed voltage acquisition circuit based on AD9235, characterized in that: The device includes a voltage acquisition circuit and a voltage conversion circuit. Multiple voltage conversion circuits can be configured and connected in parallel. Each voltage acquisition circuit includes resistors R34 and R35, capacitors C19, R28, R27, and R29, capacitors C15 and C16, a differential converter, resistors R31 and R30. The first interface of the differential converter is grounded through resistors R27 and R28. The second interface of the differential converter is connected to an external +3.3V voltage through resistor R34. The second interface of the differential converter is grounded through resistors R35 and C19. The third interface of the differential converter is grounded through capacitors C15 and C16. The fourth and fifth interfaces of the differential converter are both connected to the voltage conversion circuit. The fifth interface of the differential converter is grounded through resistors R31 and R30. The sixth interface of the differential converter is connected to an external +5V voltage. The eighth interface of the differential converter is grounded through resistor R30.

2. The high-speed voltage acquisition circuit based on AD9235 according to claim 1, characterized in that: Multiple voltage acquisition circuits can be configured, and each voltage acquisition circuit corresponds to one of the multiple voltage conversion circuits.

3. The high-speed voltage acquisition circuit based on AD9235 according to claim 1, characterized in that: The differential converter is model AD8138.

4. The high-speed voltage acquisition circuit based on AD9235 according to claim 1, characterized in that: The voltage conversion circuit includes a digital-to-analog converter U1, which is model AD9235BRUZ-65.

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