Questions tagged [level-translation]

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What's wrong with level shifter output? [closed]

I was trying to understand what wrong about the output of the level shifter, the level shifter is part of my circuit that I trying to bring-up and encountered difficulty in this issue. This is the ...
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3 votes
5 answers
968 views

Is it legitimate to level shift down a logic input with just series resistance?

In this particular instance, I'm using a STWD100NYWY3F with a 3.3v Vcc and feeding it's !EN input from a 5v TTL signal (from a SN74LS00D). The absolute max input is Vcc + 0.3v. I propose to just put a ...
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Level translator as digital buffer

In the datasheet of the C12880MA (Mini-spectrometer) they recommend using a digital buffer on pins to and from the module (CLK, ST, EOS, TRG): I'm not sure why. In my case, I need level translation ...
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  • 553
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1 answer
67 views

voltage translation 1.8V and 3.3V using passive/active components

I have a chip that operates on 1.8V Vcc and has a digital interface I2C that also obviously outputs 1.8V signals and receives 1.8V signals. The datasheet says anything above 2V on VCC or digital input ...
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  • 573
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1 answer
74 views

Output state is undefined

I am using SN74LVC1T45 for level translation of 1.8V to 5V. What is the output state when the input is floating/disconnected? Is it high, low or undefined ? I need output to be to at defined state ...
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2 answers
66 views

Fixed-direction voltage translators (level shifters) input voltages

I have a circuit that outputs a digital signal to an FPGA on an XEM6310 board. To digitize the signal, a comparator is used with a reference/threshold voltage of +12 V, with its positive rail tied to +...
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1 vote
3 answers
79 views

Sticky/Intermittent Relay Driven by MCU and NPN Transistor

I have an MCU (1.8 V logic levels) driving an NPN transistor to turn an relay on/off. The relay has a 12 V DC coil with resistance of 1028R per datasheet. This would require a current of 12/1028 = 11....
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2 votes
1 answer
458 views

Circuit for 4-20mA to I2C conversion

Hello I have a circuit that takes a 4-20mA reading from a pressure transmitter and converts it to analog 0-5V then to I2C. But it doesn't seem to be reading I just see about 0.5V on the serial ...
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0 votes
0 answers
45 views

PCA9306 Level Translator Output is coming without providing Enable Signal

I am using PCA9306 board for level Translation .The schematic is given below.The board is purchased from third party not made by me.(https://www.sparkfun.com/products/15439) I need to control the ...
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  • 241
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1 answer
58 views

Hardware Design Question Related to IMU VDD, VDDIO and IO pins

I am working on a flight controller design using ICM-20789, an IMU from TDK. As most of the components are powered by 3V3 source, so I am thinking connect IMU_VDD to 3V3 and VDDIO to 1V8 source same ...
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2 answers
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Communication between two microcontrollers with different operating voltages (5 V and 3.3 V)

I want to communicate between two microcontrollers - one is PIC18F2550 and the other is STM32F103VET. They operate at different voltages: 5 V (PIC) and 3.3 V (STM32). I would prefer to use SPI ...
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2 answers
62 views

What happens when level translator input and output are shorted?

I am using a level translator in my design to interface between two systems. I also want an option to bypass the level translator by shorting a jumper resistor placed across terminals A and B. What ...
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0 answers
32 views

Level translator 3.3 V logic to -7 V logic [duplicate]

I am trying to replace a circuit on an old device. I need to translate from 3.3 V logic to 0 to -7 V logic. And vice-a-versa. Any suggestions would be greatly appreciated. Circuit INPUT: 0 to 3.3 V ...
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3 answers
152 views

Level Translator 3.3V to -7V with drive

I am retrofitting a circuit in existing equipment. I need a circuit for each direction. Circuit 1: 3.3V logic input. Output is GND or -7V with a load of 20k to 200k and 2nF. 25kHz or less. Drive ...
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0 votes
1 answer
83 views

Level Shifting - Signal Scaling - Scale Analog Signal Voltage

I have a variable voltage called Vreg (Voltage regulated) which is output of switching regulator (buck converter) and is less than 12v. Also there is ANALOG Signal ...
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1 answer
63 views

Does this method of level shifting work?

I'm curious if this method of level shifting works fine or not; or it suits the design I manage to do. I want to extend the cable length of both an I2C, and an I2C-like, low clocked communication ...
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1 answer
382 views

I2C Level translator 5 V to 1.8 V using MOSFET, output look weird

I am designing an I2C level translator using MOSFET. I am using BSS138 DATA SHEET. My clock can go up to 1 MHz. The output is not coming properly for fast mode plus (CLK = 1 MHz, RISE TIME = FALL TIME ...
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1 answer
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Normal current flow in LSF010x level translators

I am reviewing the datasheet and design documents for a level translator. TI has a great video explaining the operation of this device. I understand how the device works but my only concern is with ...
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2 votes
2 answers
132 views

Self-adjusting analog signal translator

I think this question is best asked on concrete-ish terms, so, here it goes. Let's say we have 4 wires, all with common ground: A) ≈9V-20V, varying. B) ≈3V-6V, varying. C) A low frequency analog ...
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Level Translation Clarification (LVPECL and LVDS)

I am trying to understand something about level translation. I am sure I am probably misunderstanding something basic, so I'm hoping you can help me understand. I am trying to convert a LVPECL signal ...
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2 votes
2 answers
306 views

Can Bruce Abbott's inverting TTL to +/- 12V level shifter be improved to better frequency response and better matched impedance?

I am working with Bruce Abbott's awesome level shifter here. Level transformation 0/+5 V TTL logic to +/-9V how to maximize gain and frequency range (DC to 4 MHz) simulate this circuit – ...
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3 votes
3 answers
349 views

Level transformation 0/+5 V TTL logic to +/-9V how to maximize gain and frequency range (DC to 4 MHz)

I see a lot of repeat answers and instructions how to convert dual supply levels to logic levels, but I have the inverse situation, converting 0/+5 V TTL logic to +/-9 V, and I don't see a lot of info ...
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0 votes
1 answer
114 views

Single chip level shifter from LVCMOS to 12 V

I'm working on a nixie clock based on a STM32L476RG microcontroller and HV5530 chips. The microcontroller uses 3.3 V logic while the HV5530 really needs 12 V logic, which is a pain to implement. There ...
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0 votes
5 answers
1k views

Sharpening rise and fall time of square wave

I have designed a custom PCB using SN74LVCT145. The board is providing desired results up to 4MHz of frequency. From 5MHz to 20MHz the output waveform is not as desired. Edit 4: Can someone suggest ...
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1 vote
3 answers
111 views

Can I Use an Isolated DC/DC Converter to Step Down a Switching Dynamic Signal?

I have a 24V device that takes a signal of either of 36V or 72V that will switch on and off at around 2Hz. This signal needs to be converted to 24V and I'm considering this isolated DC/DC converter ...
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0 answers
38 views

Vias in the Input and output path

I have designed a custom level translator using SN74LVC1T45. I have placed chips on top and bottom to reduce the board size and because of this, I have used vias for the input and outputs for the ...
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0 votes
1 answer
61 views

Impedance matching for custom level translator board

I have designed a custom board using SN74LVC1T45. I have followed the schematic of EVM and added few 150R resistors at input and output for reducing the ringing effect. The custom board will be ...
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0 votes
0 answers
117 views

Stepping Down Logic Level of a Differential Signal

simulate this circuit – Schematic created using CircuitLab Suppose I have a unipolar, differential 24V signal, and I want to step it down for use with a 5V differential receiver (such as RS-422)...
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  • 591
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134 views

Significant noise observed on channels of TXB0108

We're working with a ADC chip test setup that uses the TXDB0108 to step up 1.8V data lines to 2.5V that are connected to Kintex7 FPGA. The pin-out is as follows: VCCA is 1.8V, while VCCB is on a 2....
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1 vote
2 answers
169 views

Odd level translator output waveform from 3MHz

I am using SN74LVC1T45 for level translation from 1.8V to 5V. I have designed a custom board for this. The problem I am facing here is that I am getting desired out from 10Hz to 2MHz but from 3MHz the ...
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1 vote
3 answers
625 views

How does an auto bidirectional voltage translator work?

I'm trying to understand how the auto bi-directional voltage translators work. Background: I have to choose a part that can translate signals in both ...
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  • 384
1 vote
2 answers
515 views

What does OE do on TXB0102 device

Can somebody explain in short terms whats means this from datasheet TXB0102: When the output-enable (OE) input is low, all outputs are placed in the high-impedance state. I dont know how I ...
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  • 101
0 votes
0 answers
69 views

Output impedance matching for SN74lvc1t45

We are using SN74LVC1T45 IC for level translation and we are feeding translated voltage through BNC connectors (75 ohms) to other peripherals, during this we want to achieve impedance matching of 75 ...
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2 votes
1 answer
226 views

Multiple ground planes, single point ground, and a level shifter

I'm using a level shifter to go from 3.3V to 5V (digital/analog). According to the datasheet, if I put 1 ground on the left side of the IC and the other on the right, it would tie the grounds together ...
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  • 111
0 votes
1 answer
72 views

Fixing incorrectly routed TXB0108

I have a PCB with incorrectly connected TXB0108 (TSSOP20), VCCa 3V3 > VCCb 1V8, that I wanted to use for UART communication between two ICs. I'm looking into various options for fixing it. Here's the ...
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  • 131
0 votes
1 answer
318 views

Using a Dual Bidirectional I2C Bus Voltage-Level Translator

I have a module that uses this ADC powered with 3.3V (MCP3422): Datasheet Now I would like to communicate with it over I2C using an Arduino Mega. The problem is that the Arduino's I2C is operating on ...
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  • 187
1 vote
2 answers
111 views

How can I build a versatile high voltage translator with an output in the negative and positive range?

Looking for advice on how to build an adjustable voltage translator. Input is standard 1V8 logic, but output HIGH is in a selectable range of +3 to -3V, while output LOW is way down in a selectable ...
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  • 5,804
1 vote
2 answers
196 views

Is my understanding of this level shifter correct?

I am considering using this TI LSF0102 level shifter in my circuit - but would like to understand, based upon its datasheet, if I have my understanding correct. My aim is to be able to supply 3.3V ...
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0 votes
1 answer
257 views

LVPECL termination impedance

I'm designing a level converter PCB using a LVPECL driver (ADCMP573) and a LVPECL-to-LVTTL translator (SY89323L). I'm reading a document about LVPECL termination schemes and there's something unclear ...
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0 votes
3 answers
186 views

Fast voltage translation from 3.3v to 5.7v

I need to translate a 3.3v signal to 5.7v with transition of around 60ns or less. Voltage translators such as the TXS0101 usually specify the logic high level for the input as VDD x ~0.65 (= 3.7v in ...
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-1 votes
1 answer
146 views

Active analog attenuation with OPA2340

I wish to have active analog attenuation circuit. Following this page, I got myself some OPA2340. I use the B-side to keep the numbering somewhat intact. I go with the design on Figure 16-2 (p. 14/...
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  • 101
0 votes
1 answer
109 views

Convert Oscillator output voltage level

I have a circuit of a USB chip (USB hub) with a custom external 24MHz oscillator. This oscillator have a max 3Vpp and the chip max voltage for XI is 2.45 with 1.8 recommended voltage. What are the ...
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0 votes
1 answer
145 views

Latching control via active-high battery supply / regulator shutdown pin?

I'm looking to supply an MCU (3.3 V) from battery via voltage regulator: a pushbutton should enable the supply, the MCU then should keep the supply enabled until it wants to shut itself down. But the ...
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  • 395
1 vote
5 answers
642 views

Actual reason why I have distortion in lower part of this square wave amplifier (level translator application)

I am designing a simple level translator using 2 transistors connected in series in LTSPICE simulator. I tried with one transistor but the output from the collector pin is 180 degree out of phase, as ...
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3 votes
1 answer
3k views

Design Review: 3.3V Logic to 12V Logic (Uni-directional and Bi-directional)

I'm looking for feedback and improvements on my design below. Specific questions are at the end. I created this as an attempt to answer my own, previous question. From my feedback there, it seems like ...
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1 vote
0 answers
2k views

3.3V Logic to 12V Logic (Uni-directional and Bi-directional) [duplicate]

I'm looking to understand how to convert between 3.3V logic and 12V logic, in each direction individually and bidirectionally. I know this question has been asked before, but I'm overwhelmed with the ...
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2 votes
2 answers
175 views

mosfet capacitance charging question

Can someone please explain to me why the output of this level-shifting circuit starts charging from around 2.8V to 5V, and NOT from 3.3V to 5V. At the time where the output is at 5V there is a 3.3V ...
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  • 60
0 votes
1 answer
190 views

general electrical question (with regards to the LBO pin on the Adafruit boost 500 lipo board to a Raspberry Pi)

So I was getting ready to follow this suggestion Do bi-directional level converters connect either input directly to ground? In order to pull the LBO pin to my GPIO on my RPi to shut down my Pi if my ...
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  • 3
1 vote
3 answers
11k views

1.8V UART with 3.3V UART

I have Quectel EC25 module comes with GPRS and GNSS in built, this module needs supply of 3.3V and it's UART works at 1.8V (default Baudrate is 115200) - But i have a processor ATMEGA2560V running at ...
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4 votes
2 answers
4k views

How to scale and shift voltage signal?

I want to scale and shift my voltage signal by below relation: $$ V_{out} = \frac {10} {12} \cdot V_{in} - 10 $$ Indeed my primary voltage is from 0v to 24v and I want to put it from -10v to +10v. ...
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