Are there any 6-channel analog switches that you would recommend?

天天1

Are there any 6-channel analog switches that you would recommend? [Copy link]

 

I need to measure 5-channel signals. A 5-channel one is best, but I don't think it's available. I found a 6-channel one, but it's out of stock in LiChuang Mall and the price is more than 30 yuan. Is there any recommendation for a cheaper and more common one? There is no requirement for the switching speed at present. As long as a high level can make 6 channels switch at the same time, it will be fine.

maychang

"On-resistance should be less than 0.2Ω"

This may be difficult to find. Generally, the on-resistance of analog switches is not this small.

天天1

maychang posted on 2021-9-26 16:32 "The on-resistance should be less than 0.2Ω" This may be difficult to find. The on-resistance of general analog switches is not so small.

---

I looked carefully at the ADI official website and found that most of the on-resistances ranged from a few ohms to 200 ohms. At first I thought the unit was milliohms, so I didn't make any requirements for the resistance.

wenyangzeng

CD4051 has 8 channels

chunyang

If the requirements for speed and on-resistance are not high, you can use 4000 series analog switches. It's just that the original poster didn't describe the specific function of 6-way switching. If a single chip can't meet the requirements, use multiple chips.

kinghon

MS714 is a single chip CMOS octal selectable switch

annysky2012

chunyang posted on 2021-9-27 16:30 If the requirements for speed and on-resistance are not high, you can use a 4000 series analog switch. It's just that the original poster did not describe clearly how the 6-way switch works...

Agree with this statement.

w494143467

Can you describe the application scenario?

天天1

annysky2012 posted on 2021-9-28 16:52 I agree with this statement.

It is used to measure the resistance of differential resistive sensors. There are 5 wires on the differential sensor. One board is used to measure eight sensors, and an analog switch is used for switching.

天天1

w494143467 posted on 2021-9-28 17:22 Can you describe the application scenario?

It is used to measure the resistance of differential resistive sensors. There are 5 wires on the differential sensor. One board is used to measure eight sensors, and an analog switch is used for switching.

maychang

Tiantian1 Published on 2021-9-29 08:36 It is used to measure the resistance of differential resistance sensors. There are 5 wires on the differential sensor. One board needs to measure eight sensors. It is prepared to use analog switches to carry out...

If an analog switch is used to switch the resistance of a differential resistance sensor, whether the on-resistance of the analog switch can be ignored depends on the size of the resistance to be measured. If the resistance to be measured is tens of kilo-ohms, the on-resistance of the analog switch can be generally ignored. However, if the resistance to be measured is several thousand ohms or even hundreds of ohms, the on-resistance of the analog switch cannot be ignored.

lkh747566933

You can use a TI CD4051, but the CD4051 has 8 channels, which is enough. But its channel selection is realized by three pins from 000 to 111.

dyjccx

There is no requirement for internal resistance of 40XX analog switch, and the internal resistance requires 1Ω level phtomos plus control circuit. For internal resistance of milliohms and no high speed requirement, relay plus control circuit. Haha!