Questions tagged [level-translation]

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26 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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1answer
30 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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2answers
62 views

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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2answers
49 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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0answers
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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3answers
114 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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1answer
46 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 ...
0
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1answer
56 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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1answer
79 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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1answer
22 views

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 ...
2
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2answers
120 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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0answers
25 views

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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2answers
164 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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3answers
230 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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1answer
78 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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5answers
861 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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3answers
89 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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0answers
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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1answer
57 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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0answers
77 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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0answers
109 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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2answers
161 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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3answers
436 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 ...
1
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2answers
348 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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0answers
65 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 ...
2
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1answer
183 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 ...
0
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1answer
66 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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1answer
266 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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2answers
108 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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2answers
164 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 ...
0
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1answer
201 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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3answers
166 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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1answer
133 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/...
0
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1answer
77 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 ...
0
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1answer
125 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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5answers
527 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 ...
3
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1answer
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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0answers
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 ...
2
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2answers
161 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 ...
0
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1answer
178 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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3answers
9k 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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2answers
3k 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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3answers
770 views

Proper (low power) use of a tri-state buffer when used as level shifter.

In my application, I have a 3.3v MCU driving a logic line based device at 4-5V where I need to be able to put the level shifter in a high impedance state. (This is particularly important to avoid ...
0
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1answer
51 views

Translating a signal to lower voltage

I'm only a hobbyist, so there is probably an obvious/better solution that i am simply unaware of. Project description: I'm trying to build a quiet linear power supply to power a mini DSP that can be ...
1
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1answer
97 views

I2C Level Translator Question

In the I2C Voltage translation circuit below, does it matter which side (SDA1/SCL1 or SDA2/SCL2) is the master and which side is the slave?
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2answers
3k views

74HC125 vs 74HCT125

I need an IC for two separate functions. The first is level translation from 3.3 V to 5V, so that I can use a TFT touch screen with an Arduino Uno. In order for the touch function to work, level ...
1
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1answer
2k views

5V to 3.3V Level shifting circuit

I am interfacing an SD card to the Z80, one of which uses 5 V logic (Z80) and the other uses 3.3 V logic (SD). I believe the 3.3 V to 5 V level shifting will be taken care ...
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1answer
185 views

level translator IC for SPI [closed]

In my current project I am working on the scheme and need a IC with following requirements: - It has to be a lever translator from 2.2V to 3.3V; - It has 5 channels; - on 2.2V side It has 3 ...
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1answer
1k views

How to connect a CD40109BE Voltage Level Shifter

I have a circuit requirement using a Texas Instrument CD40109BE Voltage Level Shifter. This chip incorporates 4 low to high level shifting circuits. I plan to use two of these circuits, A and B with ...
0
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1answer
150 views

Need a level shifter, is there an IC which does what I want?

I need to change 3 signals (I1,2,3) which will be at around 2V to get shifted to 5V (in one direction only to O1,2,3). This schematic should do the job, but does anyone know if: a) there's a better ...