Questions tagged [analog-switch]

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Exceed recommended power supply range on analog switch

I would like to use an analog switch in my design (NLAS5223C). The recommended power supply range is up to 4.5V, and the absolute maximum rating is up to 7.0V (relevant specs attached below.) I'm ...
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3answers
83 views

Trying to switch between 12V and 5V, CD4066B analog switch

I want to switch between an output of 12V and 5V. I'm using a CD4066B (datasheet) Here's the pinout: This is my schematic: When I build this circuit, I end up frying the IC. What am I doing wrong? ...
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1answer
48 views

How to use a SPDT with no negative capability for audio signal routing?

I have a couple of SGM3005 chips and want to use them as switches in an audio circuit, but they don't support negative signals. The classical solution would be to bias the COM1 input, right? But, what ...
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0answers
25 views

Single supply analog gate current mode switching

I need to switch a bunch of analog signals, in the \$\pm10\$ volt range, with the control coming from a microcontroller. Since the signals are all ending up in the virtual ground node of an opamp, I'm ...
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1answer
92 views

Analog Switch cannot provide 0V output when OFF

I'm trying to simulate in LTSPICE the following simple circuit, and I cannot get 0V output when the analog switch is open. Can anyone please explain why?
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0answers
89 views

Safe and feasible way to multiplex CAN bus?

Is there a standard method or tool to connect more than one CAN bus to a CAN controller with single CAN interface? Each CAN bus would be directly connected to individual transceivers and then the Tx,...
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0answers
40 views

How to make a solid state SPDT switch?

I'd like to make an analog SPDT switch along the same lines as FSA2259UMX or similar chips, but out of simple discrete components. This is partly for learning, and partly because I'm redesigning a ...
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2answers
176 views

Can I use this analog switch for CAN bus signals?

In the deutsch 9 pin obd interface for heavy trucks, some manufacturers use the pin F,G for J1939 protocol and some use it for J1708 protocol. I am trying to use a NLAS4684 analog switch with dual ...
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1answer
30 views

Max current in Analog multiplexers with latch

In case of multiplexers with a latch, how does one calculate the maximum current that the IC can drive? I am talking specifically about the HC4351 series. How much can the MUX drive, at different ...
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0answers
90 views

AD725 luma trap implementation

This question is related to my issues implementing luma trap on my bread board when it appeared that I get better results through composite output by disconnecting luma trap circuit at all. However ...
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2answers
162 views

High-current analog switch

I'm looking for an SPST analog switch (or alternative device) capable of handling >=150mA (5VDC) across its switch, controllable by a logic-high signal. I've been looking on digikey, and haven't had ...
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1answer
215 views

Any way to build Analogue Multiplexers using MOSFETs or JFETs or BJTs

Here's my requirement: I need an analogue switch that can do SPST/DPST/DPDT with very low On-Resistance (<10mOhms). There would be current flowing through this switch, albeit in the range of a <...
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1answer
63 views

Multiplexer to switch between many sets of 8 channels [closed]

I have many (up to 16) 8-channel "buses" (not digital, but analog) each with signals which I want to read with a single 8-channel analog-to-digital converter (ADC). I would switch between these ~16 ...
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0answers
25 views

Tips to design an analog automatic switch selection circuit for CT (Current Transformer) [duplicate]

I've been beating my brains out in a circuit I attached a figure below. Well I have 2 current transformers(CT). First from current on secondary 100A:50mA and second from voltage on secondary 100A:1V. ...
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1answer
73 views

CMOS switch with “negative” current

In a project, I need to swap the polarity of a 12V power/signal and GND wire combination electronically. The current flow is between 7 and 28 mA. I'm using a DPDT relay for this - the input wires are ...
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1answer
46 views

3v3 VLogic for DG212

I am curious if anyone knows if a Vishay DG212 works with VLogic being powered by 3v3? The only test conditions the datasheet speaks of are where VL is being powered by 5v. Here is the datasheet: ...
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2answers
146 views

Discharging a capacitor with an analog switch

I'm designing an op amp integrator with a 100nF capacitor, and need to include a logic level reset/discharge option. I would like to use the DG467 analog switch due to its low cost and small package, ...
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1answer
181 views

Analog switch on an instrumentation amplifier input

I'm working on a project for school that involves a configurable input stage (AC/DC coupling and variable input impedance) connected to an instrumentation amplifier. I am wondering whether I will ...
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1answer
49 views

Mixed digital/analog rails and level-shifting components best practices

I am designing a board with a ±2.5V analog domain and a 3.3V digital domain where space is at a premium. Digital and analog grounds only connect at a single point near the supplies. As such I am using/...
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1answer
295 views

Replace a relay with an analog switch

I'm trying to replace a relay with a SPDT cmos analog switch MAX4678 for switching a sine wave, The switch is powered with dual power supply +5/-5 and +5 to its V_logic pin. This is what i got in ...
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2answers
89 views

Analog Bistable Memory

I am looking for a device which I do not know exists. I would like to store the state of a number of analog switches, perhaps driven by a D Type Flip Flop. I'd like to drive the flip flop and set ...
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1answer
241 views

MOSFET analog switch, Transmission Gate, Bilateral switch circuit questions

Below is an LTSpice simulation of two attempts at a Mosfet bilateral switch or 'transmission gate'. The plot shows the switch (onoff) going from 0 to 5v (in blue) and a sine wave audio signal being ...
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2answers
2k views

Switching RS-485 bus

As shown in the graph, I'm trying to use mcu-controlled switches to turn a segment of rs-485 bus on or off (so that only one segment is on at a time). I was considering analog switches but I'm not ...
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2answers
567 views

Pulldown to prevent floating input pins for multiplexer

I'm designing a multiplexer shield for Arduino, by which it will (hopefully be possible to read up to 64 analog inputs such as potentiometers etc.. Schematics of rev.0.1 can be found here. I'm using ...
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2answers
358 views

Questions regarding a comparator circuit coupling to an analog switch

This is directly related to my previous question, so it requires to first have a look at that. And the below LTspice implementation is based on Andy Aka's answer. The following circuit works in ...
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1answer
68 views

Voltage across the IC

I need to switch three different supply and for that I am planning to use 3:1 Analog switch something as shown in the below Block diagram. As we know there will an on resistance(Ron) for these kind ...
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1answer
117 views

Single Ended Precision Variable Amplitude Square Waves and Charge Injection

I love to hear any thoughts about a good break-before-make analog switch with low charge injection or even even better any thoughts on generating precision amplitude square waves in general. As to ...
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2answers
148 views

S,D terminals of analog switch

I find analog switch usually label the two terminal of the switch channel as "S"(Source) and "D"(Drain). Such as this. I think they are equal in function, either can be used as input or output. So why ...