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Domestic chips are becoming more and more powerful. Today I saw that Shengbang Micro released a 4-matched resistor. A few years ago, when Linear was not yet acquired by ADI, it released an LT5400. At that time, I thought this thing was very powerful, cheap and convenient to use.
I didn’t expect that Shengbangwei would come up with it in just a few years. Although there are some differences in the indicators, it is still quite impressive.
Shengbangwei's 4-matched resistor model is SGM9100, with a high matching accuracy of 0.01%, a resistance matching rate temperature drift of 0.24ppm/℃ (typical value), a resistance matching rate long-term drift of 15ppm after 2000 hours, an operating voltage range of ±75V (±80V absolute maximum value), an absolute resistance value temperature drift: 5ppm/℃ (typical value), and an MSOP-8 (exposed pad) package.
The LT5400 released by Linear at that time was divided into A-grade and B-grade. The A-grade had a matching accuracy of 0.01%, the B-grade had a matching accuracy of 0.025%, the matching temperature drift was 0.2ppm/°C, and the resistance matching rate drifted for 2000 hours for a long time was < 2ppm. The operating voltage range was also ±75V (±80V absolute maximum), 8ppm/°C absolute resistance value temperature drift, –55°C to 150°C operating temperature range, and 8-pin MSOP package.
The left side of the picture below is SGM9100, and the right side is LT5400
SGM9100 is benchmarked against LT5400's Class A accuracy. Its temperature drift is slightly higher than LT5400, but the maximum is 1ppm. Its long-term drift is 15ppm, which is slightly more than LT5400. The temperature range of LT5400 is better than SGM9100. The absolute temperature drift of SGM9100 is 5ppm typical and 10ppm maximum. LT5400 is minus 10~25ppm, and 8ppm typical. In this respect, SGM9100 is better.
Because this device is not very common, do you know in which circuits or application scenarios it is usually used?
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