Product recommendation | Shengbang Microelectronics launches high-precision SAR ADC SGM51652H4/H8 for the industrial market
Latest update time：2023-08-16
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Keywords: 16-bit resolution; 4 channels/8 channels; bipolar input; on-chip integrated PGA
In order to accurately obtain real-world data such as temperature, humidity, pressure, position, etc., we need to use sensors to measure and output electrical signals in the form of voltage and current; to further analyze and utilize these real-time signals, we need to use what is known as analog The crown jewel of the circuit is the Analog-to-Digital Converter (ADC).
Today, with the accelerated implementation of Industry 4.0, more and more industrial automation application scenarios (analog input modules of PLC) require the deployment of SAR ADCs in the signal chain to achieve high performance and high reliability signal conditioning. These SAR ADCs need to provide high sampling speed and resolution, adapt to a variety of input signal range requirements, and need to ensure stable and consistent performance in the complex environment of industrial sites and across the full temperature range. In order to meet the needs of these application scenarios, Shengbang Microelectronics has launched the SGM51652H series of ADC products.
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Excellent performance
SG Micro Corp
SGM51652H4 and SGM51652H8 are 4-channel and 8-channel SAR ADCs respectively, with 16-bit resolution and up to 500kSPS sampling rate (single channel). Powered by a single unipolar 5V, these devices support bipolar ±10.24V, ±5.12V and ±2.56V inputs, as well as 0V to 10.24V and 0V to 5.12V unipolar input ranges (input ranges are software configurable). The input impedance of the ADC is not affected by the sampling frequency and input range configuration. In addition, the SAR ADC also provides ±20V overvoltage protection at the input end, has an on-chip high-precision and low-drift 10ppm voltage reference source, and a digital interface compatible with the traditional SPI protocol. These functions determine that the SGM51652H4/H8 can be widely used in PLCs. Industrial automation applications such as analog signal acquisition.
In terms of performance parameters, SGM51652H4/H8 is also remarkable. For example, it has -0.6/+0.9LSB DNL (differential nonlinearity), ±1.3LSB INL (integral nonlinearity), -99dB THD (total harmonic distortion), and 89.5dB SNR (signal-to-noise ratio). In terms of main DC and AC performance indicators, SGM51652H4/H8 has also reached high international standards.
Figure 1 TSSOP-38 pin configuration of SGM51652H4 and SGM51652H8
unique architecture
SG Micro Corp
If you want to truly "understand" SGM51652H4/H8 and understand the value it can provide in practical application design, it is not enough to just look at the performance parameters listed above. In-depth analysis of the architecture is also required.
Figure 2 SGM51652H4/H8 system block diagram
SGM51652H4 和 SGM51652H8 每个模拟输入通道均配置了一个过电压保护箝位电路、一个可编程增益放大器（PGA）和二阶低通滤波器，该滤波器在将输入信号馈送到 4 或 8 通道模拟多路复用器（MUX）之前对输入信号进行了滤波。
The on-chip integrated PGA is a highlight of the SGM51652H4/H8 architecture. It should be known that in industrial process control systems, a configurable and flexible input range is required. When the SAR ADC needs to support different analog input voltages, an external PGA is often required, which will undoubtedly increase the complexity and cost of the system. The SGM51652H4/H8 provides a dedicated PGA on each individual analog input channel, allowing each channel to have a configurable and flexible input range.
Table 1 The SGM51652H4/H8 on-chip PGA uses a highly matched resistor network for gain configuration. This is the input range selection bit (RANGE_CHn[3:0]) details.
Another very ingenious design in the architecture of SGM51652H4/H8 is to simplify the power supply of the analog acquisition front-end system, so that the SAR ADC front-end only needs a single 5V power supply to realize the input of ±10V, ±5V bipolar signals. Therefore, The chip no longer requires an external high-voltage bipolar power supply and complex drive circuits during use, which not only saves costs but also reduces the size of the system.
If we explore further, we will also find other advantages brought by SGM51652H4/H8 through design optimization:
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Input Overvoltage Protection : The SGM51652H4/H8 has an overvoltage protection (OVP) circuit on each input channel to help system designers protect the ADC inputs from overvoltage events.
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Multiplexers : The SGM51652H4 and SGM51652H8 feature integrated 4-channel and 8-channel analog multiplexers respectively, with a maximum total throughput of 500kSPS for all channels.
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Supports daisy chain topology : SGM51652H4/H8 can enter daisy chain mode without any special hardware or software configuration, which can greatly improve the signal acquisition and processing capabilities of the data acquisition system and increase the flexibility of application design .
It can be said that it is precisely because of the above series of optimized designs that it meets the customer needs of analog acquisition units for PLC and DCS systems in the industrial market and analog acquisition units for other process control systems.
Systematic advantages
SG Micro Corp
Industrial market applications have particularly high requirements on product consistency, stability and reliability. Through more than 20 years of accumulation, Shengbang Microelectronics has gradually developed a complete set of product life-process support from R&D design simulation, laboratory testing, mass production verification testing to customer field application reference design and support, after-sales failure analysis, etc. and service system to provide customers with a full range of services and support.
1. Stable and reliable mass production testing.
ADC is a high-precision digital-analog hybrid device. To achieve high-precision indicators, high-precision signal collection must be achieved during production testing. Although the key performance of a SAR ADC has been reproduced in laboratory tests during the development process, whether it can maintain such consistency in mass production and ensure that every chip delivered to customers can achieve the same performance is still a great challenge. To this end, Shengbang Microelectronics specially purchased advanced testing equipment and deployed it on the production line of the packaging and testing factory. At the same time, it invested a lot of time and manpower in secondary development to achieve high-precision measurement and high-speed acquisition of the testing equipment system. In the end, Shengbang Microelectronics successfully overcame the problem of consistency and ensured that every SGM51652H4/H8 received by customers has reliable quality and stable performance.
2. Provide complete system solutions.
With the diversification of industrial field application scenarios, the requirements for signal acquisition systems are also diverse. Shengbang Microelectronics has established a strong AE and FAE team to go deep into the front line of industrial automation customer applications, and work with customers to design, verify, and implement solutions for various test and measurement signal systems.
3. First-time online and offline technical support services.
After the application development of SAR ADC is completed, problems such as occasional failures will inevitably occur during actual use. Whether it can provide customers with failure analysis and accurately locate problems will test the chip manufacturer's continuous technical support capabilities. In this regard, Shengbang Microelectronics has also made sufficient preparations, and technical experts can provide services at any time.
Competing on the SAR ADC track
SG Micro Corp
In the industrial application market, following the SGM51652H4/H8 series of products, Shengbang will continue to launch more series of products, covering more market segments such as industrial instruments, laboratory testing, medical equipment; at the same time, with our extensive expertise in analog chips Category coverage, providing customers with complete system-level solutions.
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