Domestic high-precision, high-speed ADC chips are on the rise-EEWORLD

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ADC can be called the pearl in the field of analog chips. As a key component, ADC design is difficult and has a high patent wall, so China has always been in a state of catching up. In recent years, domestic ADC has developed very rapidly and gradually caught up with the international mainstream level in various parameters.

It has to be said that ADC chips themselves are relatively scattered. Since sampling speed and conversion accuracy cannot be achieved at the same time, there are SAR, Sigma-Delta and other types of ADCs for different applications. Therefore, it is inevitable that there will be confusion when selecting a model, especially when faced with domestic products with different performances, which is even more dazzling.

Therefore, we invited many engineers to share the ADCs they often use in their daily projects and share their own experiences in ADC selection to see if there is one that they have in mind.

High-precision delta-sigma ADCs are gaining attention

High-precision ADC has always been the goal pursued by domestic manufacturers. In actual applications, engineers need to use more sampling bits to obtain high precision. In recent years, many domestic ADCs have come into the sight of engineers. Xinhai Technology's high-precision, low-power analog-to-digital conversion chip CS1232 has attracted widespread attention from EEWorld engineers. It is a highly integrated ADC, and many engineers have used it in their own products. According to them, Xinhai CS1232-TS can be used in scenarios including industrial process control, electronic scales, liquid/gas chemical analysis, blood meters, smart converters, and portable devices.

According to the official datasheet, the resolution of CS1232 is 24bit, and the effective resolution can reach 20.8bit; it has a built-in Sigma-Delta ADC, which uses a third-order Sigma-Delta modulator and implements PGA amplification through a low-noise instrument amplifier structure, with optional amplification factors of 1, 2, 64, and 128; when PGA=128, the effective resolution can reach 20.8bit; the output rate of CS1232 is optional at 10Hz/80Hz; CS1232 has a built-in RC oscillator (+8%), which can use an external crystal oscillator or directly input the clock through the pin CKIN/XTAL1; CS1232 has lower power consumption modes such as Standby and Power down; PP noise: 10Hz: 139nV; 80Hz: 298nV. Integrated 2-wire SPI communication interface; integrated temperature sensor; INL is less than 0.001%.

Low-noise △-Σ ADC star product

Low-noise ADC products are also one of the products commonly used by engineers. Shengbang Microelectronics' low-noise, 24-bit, △Σ ADC SGM58601 is considered a star product by engineers. According to engineers, Shengbang Micro's SGM58601 has been optimized for low noise. At present, Shengbang Micro's overall signal chain revenue has reached nearly 40%, which can be said to be an important product line that the company is working on. Application areas include laboratory instruments, measurement and testing, industrial process control, and medical devices.

According to the official datasheet, the SGM58601 series of products includes SGM58600, SGM5860 and SGM58602, which have low-noise, 24-bit, 60kSPS, Δ-Σ analog-to-digital converters (ADCs); noise-free resolution: up to 22 bits; data output rate up to 60kSPS; with a fourth-order Delta-Sigma modulator plus a fifth-order Sinc filter (Sinc5), and optimized for low-noise performance; the multiplexer supports flexible configurations such as single-ended input or differential input configuration; with selectable input buffers, increased input impedance, and a low-noise programmable gain amplifier (PGA) that provides gains from 1 to 128 in binary steps; 0.0012% FSR when PGA = 1 (TYP); with SPI compatible interface; rated temperature range is -40℃ to +125℃; low noise programmable gain amplifier: 30nV input reference noise; one-time conversion with single cycle stability; chopper stabilized input buffer; support self-calibration and system calibration settings for all PGAs; support SPI compatible serial interface.

The long-awaited SAR ADC

In actual work, we have many applications that require medium to high sampling rates, which requires a very good SAR ADC. 3peak's 8-channel synchronous sampling SAR ADC TPAFE5160 is recommended by many netizens. EEWorld engineers said that 3peak (Chinese name 3peak) refers to ADI's ideas to make mid-to-high-end op amps, and the overall product quality is excellent.

Engineers' evaluation of the TPAFE5160 P2P product is that as a product that can compete with foreign products, it has entered the State Grid certification catalog and has the localization certificate of the Fifth Institute of Electronics, which is highly recommended. It can be widely used in relay protection, distribution automation, industrial automation and control, energy storage, digital power supply, automated test equipment and other fields.

According to the datasheet, the TPAFE5160 is a 16-bit, 8-channel synchronous sampling successive approximation (SAR) ADC. Each channel has a complete analog front end with an ADC conversion rate of 350 kSPS per channel. The analog front end has an input clamp, a programmable gain amplifier (PGA) with a 1MΩ high input impedance, a low-pass filter, and an ADC input driver. The device has an internal precision reference with a buffer for driving the ADC. The digital interface supports serial, parallel, and parallel byte communications and can be used with a variety of host controllers. The TPAFE5160 has a true bipolar input of ±10V or ±5V and relies on only a single 5V power supply. In addition, the high input impedance allows direct connection to transformers or other sensors without an external drive circuit. High-performance zero-delay conversion also makes the device suitable for industrial automation and control applications.

Want to know more? Welcome to the "Most Powerful Chinese Chips" special topic. This special topic focuses on three aspects: analog and power, digital, and application. It integrates the actual experience of engineers, the experience of industry experts, and the editor's opinions to select the "most powerful" products from the subdivided categories.

At present, the topic covers 13 sub-categories of chips, including silicon carbide (SiC), amplifiers and comparators, LDO, DC/DC, sensors, data conversion, charging management, interface circuits, Bluetooth/Wi-Fi chips, MCU (RISC-V architecture), MCU (Arm architecture), automotive chips, and instrumentation. The specific list is as follows:

The complete list information comes from: https://www.eeworld.com.cn/aq1eDO0

As long as you have an idea, anyone can "kick the list" at any time and put their favorite chip on the list. To view the complete list, please visit: https://www.eeworld.com.cn/aq1eDO0

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