Questions tagged [analog-switch]

An electrical component which performs a similar function as a mechanical relay (conducts an analog or digital signal when on but does not conduct when off). Unlike a mechanical relay, however, it has no moving parts, and it may or may not provide galvanic isolation between the control signal and the switching terminals.

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Evaluating make-before-break impact

I'm exploring the possibility of using TI's TS5A3160 analog switch to implement a "buffer" for a square wave. The idea is, to use a square wave with a low driving capability as the control ...
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How to electronically switch the output of an LED driver between two different 10W LEDs?

I have the circuit in the image below working with the PT4115 driver. I use it to light a 10W LED from a 24V DC source. The LED draws close to 1A. I can control it with a 5V PWM signal from an MCU. ...
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Automatic multiple switch ON when power is applied

I have made a switch as shown in the schematics to turn ON/OFF 24 loads. When I apply a pulse on the ON-signal the load gets 24 V and when an OFF-signal pulse is applied the 24 V at the load gets ...
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Switching between Vin and regulating voltage when unit turn on

I am trying to find way to switch between power supply on common pin of overlay (or button). I came with simple p channel Mosfet circuit I just want make sure if this will work. (all overlay button ...
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Latching an analog signal on a trigger event

I am looking for sort of an analog equivalent of regular digital latches. I want it to mirror its input (voltage) to its output (voltage, with or without gain) only at a trigger edge/pulse and ...
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Can I control 5V input on CD4051 but power the IC with 3.3 volts?

Datasheet of CD4051 say: Wide Analog Input Voltage Range: ±5-V Maximum. CD54HC and CD74HC Types Operation Control Voltage: 2 V to 6 V Switch Voltage: 0 V to 10 V In my circuit I power (VCC) the IC ...
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How to use current sources correctly

In this simulation the circuit generates a AC signal at "Electrode". Here I am using two SPDT-Switches (Ron = 4 Ω). My first question: Why isn't the signal correctly rectangular? And how ...
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Analog mux with active low enable.I/P and O/P state when enable is High

I am using this mux (74LV4051D,118)from Nxperia for one of my applications.The functional table is given below. When the Enable is High S0, S1, S2 are don't care, and the switch is off. May I know ...
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Simulation of MOSFETs as high-speed switches

I’m trying to simulate high-speed switches (2xSPDT) made of MOSFETs. The MOSFETs should switch so that while “I2” flows into output, “I1” flows into “U_1” (or vice versa). I couldn’t interpret the ...
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2 answers
55 views

Overvoltage on input pin of analog switch

I'm building a device, where I need to switch pin between analog signal 0 V-5 V and 12 V digital signal. I was thinking I could use a BL1551 (datasheet) or similar analog switch to shut off the analog ...
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Why does this NPN transistor operate differently if it comes before the switched element?

I'm simulating turning an LED on with a transistor switch in LTSpice. To my bewilderment, the current through the LED in Circuit 1 is ~51 mA and the current through the same in Circuit 2 is only ~6 mA....
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Pulling the common I/P of analog multiplexer/demultiplexer to Vcc

I am using an analog MUX/DMUX (74LV4051D,118) for enabling/disabling a transistor that is driving a reed relay. The MUX_DMUX selection lines are controlled by Arduino Nano. The common input/output is ...
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CMOS (analog) switch output has a few hundred mV offset when output is disabled

I'm using an TS12A4514 CMOS switch in order to isolate some digital lines from one device to another. Power rails are 5V & 0V (GND). While the switch is enabled (enable input is 5V), input ...
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Power switch for 8Pin ATX Connectors

What would be the best way to make a power switch for the 8-pin ATX Power Connectors? Can I just join all the yellow (12V) wires together and then use a high current switch to toggle them ON/OFF? Also ...
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Connecting multiplexer/demultiplexer input to Vcc of the same chip. Will this cause any performance issues?

In one of my circuits, I am connecting the I/P pin of multiplexer/demultiplexer to Vcc (5V) as shown below. I have 2 questions. When switching, will the current draw cause performance deviations in ...
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2 answers
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Measure battery voltage from a device that powers up/down periodically [duplicate]

I have a MCU that powers up periodically to log some data and then powers down (full power off -- not sleep). When powered on, it runs off a battery and I want to connect the battery to an analog pin ...
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Digital inputs for analog switches (analog or digital ground?)

I'm using an analog switch, ADG1434 to switch some filter components in a circuit. My question is about general best practice for the digital signals going to analog switches. The switch is dual ...
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1 answer
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Would the CD4053 still be capable of handling tiny voltages?

Since the CD4053 and other CMOS ICs can't handle a bi-polar 12V circuit, I was wondering if the CD4053 would still be accurate once the control signals / audio has be scaled down to millivolts ...
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2 answers
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Gating a 5 V signal on <microsecond scale with a small gate signal, should I use a MOSFET?

I have a 20 Hz (~25 µs long) 5 V square-pulse that I would like to block most of the time, and only let through when another channel is above some 100 mV level. I wonder what would be suitable ...
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1 answer
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Solid State Relay capacitance causing distortion

I designed a relay network board. The idea is to select one differential measurement points from a high voltage device. In order to do that, I used these solid state relays. You will see the board ...
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Is it OK to control many (10s) of analogue switches with a single buffered op-amp?

Analogue Switch (SPDT) - DG419LEDY-T1-GE4 Datasheet: Vishay - DG41XLE Analogue Switches Op-amp - LM358PT Datasheet: LMX58 Op-amps Using a microcontroller's GPIO, and a non-inverting buffered op-amp ...
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1 answer
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Multiple switch option for V12 reverse camera in car

I am installing a backup camera into a car. The instructions say a few things: When wiring it to the reverse lamp, the display (GPS) will switch automatically, but will only work when backing up. ...
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3 answers
348 views

Use a MOSFET to switch on/off power supply for a low power microcontroller

I am trying to develop a circuit that can switch on and off the power supply for a microcontroller. I have around 0.2 - 0.7 V which I can generate to control the electronic switch. My idea was to use ...
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1 answer
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Trigger TTL input signal with a micro switch

I used to have a machine where an action could be triggered on a pontential free contact with a simple micro switch (that worked pretty easy and well for me). That machine got replaced and the new ...
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2 answers
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Issue with 4x4 USB switcher

I am building a 4x4 Arduino controlled USB switch The idea is as follows: 2 sets of CMOS analog switches form a 4x4 matrix to switch the D+ and D- USB signals using MAX4652SE chips The USB devices ...
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2 votes
3 answers
359 views

Clipping when using a CD4051 analog multiplexer

Regarding the CD4051 analog multiplexer, Data Sheet If I connect VDD to +5 V and VSS, VEE to GND. The analog signals are coming from modules with the analog signal having a DC offset that can be as ...
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Powered-off input protection using analog switch (ADG4612)

I have a battery powered device that has two analog 0-5V input lines, and two I2C lines (3.3V, 5V tolerant). All of them need to be protected from ESD (8kV contact, 15kV air discharge) and over-...
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1 answer
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PMOS Saturation Condition

we know for nmos works in active region, we must have Vgs-Vth>0 and Vds>Vgs-Vth. For PMOS can I write like this | Vgs|-|Vth|>0 , |Vds|>|Vgs|-|Vth|. Please correct me if I am wrong
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Texas Instrument SPDT TS5A22362DGSR not swtiching properly

I have bought a couple TS5A22362DGSR from TI and it's not switching properly, I'm trying to switch between a record player and a laptop. As shown above, I want the signal from a record player, after a ...
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How to improve this bypass switch from floating/differential to grounded/single-ended with just one DPDT?

This is for use in guitar onboard active electronics. (i.e. battery powered, installed in the guitar.) I want to be able to switch between: Differential input (to Op Amp circuit) with pickup coil ...
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0 answers
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High current, low activation voltage relay or analog switch IC

I am working on a gauss rifle, which will be controlled by a computer system running at 1 amp / 5 volts. This computer system will need to interface with the magnetic coils of the rifle in order to ...
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2 votes
2 answers
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Electrical model of ADG436 switch

I need some help with understanding the electrical model of ADG436. After reviewing the datasheet, I am still unsure if my simplified schematic for this part is correct. I used the values for +/- 15V ...
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-3 votes
3 answers
102 views

How To Make A Switch Close When Another Switch Close? [closed]

I want to use a rotary switch to switch between filters which I believe will give me different frequencies. But the problem is when I connect the positive feedback to the other filters too, naturally, ...
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1 answer
151 views

Instrumentation amplifier protection from high voltage transients with minimal signal degradation

I am looking to protect an INA849 at 2000 or more gain from high voltages of 30 volts AC at various frequencies. Currently I am using an analog switch IC as the only time the high voltages are sent ...
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1 vote
0 answers
202 views

SD card communication failure with USB2244 and TS3A27518E

friends! I'm facing a very peculiar issue on a hobby project of mine, and would appreciate any insight. The schematic for the relevant part of the project is attached at the end of this post. What I ...
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4 answers
229 views

Analog switches able to send bi directional digital information?

I'm trying to send digital signals from an ST-Link V2 programmer connected to my computer to a blue pill STM32 microcontroller, but I want it to go through a DG412 Quad SPST CMOS Analog Switch. As far ...
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1 answer
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How to properly drive parallel analog switches (variable capacitive loads) with opamp(s)?

So as you can see I have 16 SPDT switches on one side of my 16 'RUT paths' and 16 SPDTs on the other side. Each SPDT(ADG1434) has two source pins (SXA and SXB) and a common drain pin (DX), 'X' ...
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3 votes
2 answers
265 views

Programmable gain Transimpedance amplifier for 4-5 decade resistance measurement using Pulse voltage/current

As you can see from my previous question, I am trying to measure resistance within the range of 200k-60 ohms (around 4-5 decades). I will be using a pulse (5us pulse width and 50ns each rise and fall ...
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1 vote
1 answer
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Analogue switch TS3A475 does the direction matter?

Does the "direction" of the signal matter? signal is 1/3Vcc to 2/3Vcc
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0 votes
3 answers
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generating potentiometer adjustable, non-inverted voltage square pulses from microcontroller gpio output

I would like to generate a square signal with SW adjustable duty cycle, phase etc using the output pin of a microcontroller (3.3V). Frequency <100Hz. However, I also want the amplitude of the ...
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1 vote
1 answer
102 views

Grounding one port of SPDT analog switch

We are using a micro-controller to interface RGB matrix (HUB75 connector). Matrix row can be selected using signal pins (A-E). Some RGB matrix suppliers require to use (CLK/DIN/OE) on (A/B/C) pins to ...
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0 answers
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Feedback on converting signal from 3.5mm jack to ADC on STM32 Bluepill

I'd like some feedback on my circuit. My goal is to convert an audio signal coming out of my laptop's 3.5mm jack (using a sin generator at max volume gives me about a ±1.5V wave) to digital using the ...
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0 answers
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ADG714 analog switch daisy chain issue

As per shown in the below schematic, I have two ADG714(datasheet) octal SPST analog switches connected in the daisy chain configuration. IC7 is connected to the STM32F303 controller. connenction of ...
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29 views

How to make an electronic switch for a current-mode digital to analog converter?

In a current-mode DAC there is a switch in the current path between virtual ground and actual ground based on width. How can I design the switch used?
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2 votes
4 answers
551 views

Opamp design using LTspice

I just finished an online lecture about analog IC design. I want to put into practice what I have learned and searched for projects that will help me achieve my goal. I stumbled upon this project ...
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1 vote
1 answer
114 views

Inaccurate output voltage from the Analog Multiplexer

I am using the analog multiplexer "MAX337" in my design to get the voltage drop over a shunt resistor from 8 branches, then i use a "INA118" instrumental amplifier with 500 gain to ...
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1 answer
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possible CMOS techniques for altering the pulsewidth and phase shifting of a pair of complementary squarewave signals

My question is very simple in terms of input and output required. Following illustrations are for input and output: input signals are a pair of complementary signals operating under 1MHz of speed. ...
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2 answers
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VIH of digital selection inputs for analog Mux when supplied with 4096mV - CD4051 IC

I will use CD4051BM96 part number, DATASHEET On page 7 is shown specs of VIH. It shows VIH of 3.5V for 5V supply (this 70% of VDD), VIH of 7V for 10V supply (70%) and VIH of 11V for 15V supply (73.3% ...
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1 vote
1 answer
198 views

Are Dual Bus Transceiver or Analog Switch best practice to manually switch between SPI devices?

I have two different use cases for 4 lines (this could be an SPI bus or other digital signals). The goal is to manually switch all four lines between the two different use cases with just a single ...
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1 vote
1 answer
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Transmission gate vs triac

Both transmission gates and triacs can be used as an analogue switch, but I am a bit confused about what the difference would be in using them for a design. Is one better at higher current situations ...
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