ADI chip usage experience and feature description

1. The most commonly used chip: AD736 RMS uses about 1,000 pieces per year, but the range is a bit small. It can be used in a product with 7116 and can be adjusted to zero. The price of the label is about 36 yuan/20 pieces, and the price of direct insertion is about 27 per 100 pieces.

2. AD711 is used as a filter output behind ad736. The leakage current of this op amp is small. When the resistance is 1m, the zero drift voltage is less than 1mv, which can meet the needs of 12-bit op amps. It costs about 18 yuan per piece.

3. OP2177. This op amp has a low swing filter, but it is a precision op amp. When I used tl062 as an integrator before, the error was relatively large. Later, this one was used, which is much better. It can also be used for filters. If the whole system uses it, the regulation circuit of ad736 can also be saved. The price seems to be around 18.

4. OP37 was the first single op amp used, but later it was found that it was prone to self-excitation when used as an attenuator, so this current was relatively large.

5. I don't know if LF441 is used as a charge amplifier by AD. I am going to replace it with an FA-level OP from AD. The charge amplifier requires the current to be as small as possible.

6AD526 PGA can reach 16 times, about 56/50 pieces. The DC offset is relatively large at a large magnification, but fortunately there is a potentiometer to adjust the zero section. This is a positive and negative voltage PGA. Looking at the market, it seems that only a few models of TI can be compared, but TI's supply is not very stable. I thought the ad825x series would have a model with the same magnification, but the good performance of ad's products was disappointing.

7. ad620... I won't explain this one much, everyone has used it.

8. The reason why OP7 was eliminated for making three-op-amp IA: there are too many fakes~~~ In addition, the effect is not good in actual use, and it is not easy to make high-quality products with cmmr. After several on-site comparative tests, it is better to use 620 directly.

9. AD595 is about 60-80 and has been replaced by LT because LT is surface mounted and there is limited space.

10. AD694. There is nothing much to say except that it is better than what I put together. Of course, I haven't tried to use high-end OP to match it. I guess the price is about the same, about 35/10 pieces.

11. AD7502 has been replaced by ADG409. There is nothing much to say about 409. It costs about 27 yuan per piece. I want to use adg120x as pga to replace AD526. Unfortunately, the new product is too hard to buy.

12. AD7663: Nothing much to say except that it is expensive, probably less than $170. Maybe you bought too little. It is paired with ad8021 and an ADR.