Circuits & Schematics Analog Devices - 2

11. Measure an optocoupler's CTR
    Chee Hua How
    Circuits Measurement Analog Devices AD620 AD734
    Manufacturers of optocouplers characterize their devices for CTR (current-transfer ratio), and an optocoupler’s data sheet will list its CTR ranges. Unfortunately, the CTR range may be too wide for some applications, requiring you to screen ...
    Jul 25, 2024
12. Low-power ambient light sensing LED driver, with hibernate mode
    Chau Tran
    Circuits Supply Light Analog Devices ADA4807-1
    This circuit of only a few components is powered by two AA batteries and features a mode that extends its power savings. Imagine a smart light switch which not only automatically turns itself on when it gets dark, but also adjusts its level of ...
    Jul 22, 2024

13. Precision programmable current source uses two ICs
    Pietro Oliva Stefano Salvatori
    Circuits Analogue Design Supply Analog Devices LT1991 LT1995 LT1996
    This Design Idea mates a precision current source IC with precision difference amp chips to create a programmable current source or sink. The resistor-programmable current source/sink in Figure 1 illustrates the basic topology, taking advantage of ...
    Jul 17, 2024
14. A low power, low cost, differential input to a single-ended output amplifier
    Chau Tran Jordyn Rombola
    Circuits Analogue Design Amplifiers Analog Devices ADA4807-2
    In many applications, there are requirements of low power, high performance differential amplifiers to convert small differential signals to a readable ground referenced output signal. Input voltages at two inputs usually share a large common-mode ...
    Jul 15, 2024
15. Monitor a differential pair for valid & fault conditions
    Budge Ing
    Circuits Interfaces Analog Devices MAX3280E
    It is advantageous to know if there is a valid signal on a differential signal bus. This Design Idea detects differential data transmission and reports a loss of signal (LOS) to a microcontroller or other monitoring device. The circuit of Figure 1 ...
    Jul 11, 2024
16. Low-power, low-cost, differential amplifier with high CMRR
    Chau Tran Jordyn Rombola
    Circuits Amplifiers Analog Devices ADA4805-2
    Many applications require special differential amplifiers that achieve both high performance and low power dissipation. A simple solution is to use a dual non-inverting precision amplifier with a resistive gain network, but the DC common-mode level ...
    Jul 10, 2024
17. Difference amplifier measures high voltages
    Chau Tran Moshe Gerstenhaber
    Circuits Analogue Design Measurement Analog Devices AD629BR
    Figure 1 shows two large-signal- measurement methods. The first uses a two-resistor voltage divider and an output buffer, and the second comprises an attenuating inverter and a high-value input resistor. Both of these approaches introduce ...
    Jul 1, 2024
18. Simple circuit converts 5V to -10 V
    Ken Yang
    Circuits Supply Analog Devices MAX889
    A typical switched-capacitor charge pump requires no inductors, is easy to design, and can double a positive voltage or convert a positive voltage to an equivalent negative voltage. However, in some applications, only a positive supply is ...
    Jun 10, 2024
19. Virtual-zener circuit simplifies high-voltage interface
    Philip Lane
    Circuits High Voltage Signal Processing, Filters Analog Devices LT1021
    This design for a photonic switch needs more than approximately 70 V at the cathode of a duo-lateral optical position-sensing device. This voltage gets speedy response at longer wavelengths, such as 980 nm. The circuit uses fast transimpedance ...
    Apr 1, 2024
20. Creating a very fast edge rate generator for testing (or taking the pulse of your scope)
    Damian Bonicatto Phoenix Bonicatto
    Circuits Oscillators Analog Devices LTC6905
    I recently purchased a new oscilloscope for home use. It’s a 250 MHz scope, but I was curious what the actual 3 dB frequency was as most scopes have a bit more upper end margin than their published rating. The signal generators I have either ...
    Mar 18, 2024

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