Circuits & Schematics Analog Devices

1. Water-leak detector uses 9V batteries
   Yongping Xia
   Circuits Measurement Analog Devices MAX934
   A previously published Design Idea describes a practical gadget that has the potential to save a lot with little investment ( Reference 1 ). However, the circuit uses 120 V line voltage and, as such, it is not that convenient for many applications. ...
   Apr 18, 2025
2. White-LED driver provides 64-step logarithmic dimming
   Will Hadden
   Circuits Supply Light Analog Devices MAX1573 MAX4480
   The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3 V source and adjusts the total LED current from 1 to ...
   Apr 14, 2025

3. Test technique quantifies jitter of discrete-comparator design
   Tim Davis
   Circuits Measurement Analog Devices AD8220 ADR5041 LT1634 LT3081 REF195
   A colleague asked for the measured jitter number on a single-supply comparator design based on the LM359 IC ( Ref. 1 ). He wanted to know how the jitter performance of the discrete comparator compared to an IC comparator, which was used with an ...
   Apr 9, 2025
4. Design an RTD interface with a spreadsheet
   Robert S. Villanucci
   Circuits Analogue Design Measurement Analog Devices AD633 OP177
   RTDs (resistance-temperature detectors) are the preferred sensor choices for designs requiring precision. Although RTDs are approximately linear over the limited temperature range of 0 to 100 C, these sensors exhibit a slight but progressively more ...
   Feb 25, 2025
5. Resistive dummy load draws constant current from 1.2 to 50 V
   John Guy
   Circuits Measurement Supply Analog Devices MAX480 MAX6006A
   This dummy-load circuit has been in use at Maxim for more than 10 years (see the Figure 1). It's useful for testing power supplies and power amplifiers as well as drivers for LEDs, relays, and solenoids. Plus, it overcomes the limitations of ...
   Dec 26, 2024
6. Expanding output range of step-up converter
   Peter Demchenko
   Circuits Supply Analog Devices ADP1611
   This is one real-life quest: How do we increase the output voltage of a step-up converter? If you have unlimited access to the right ICs, you are one lucky dog, but what if you don’t? Or maybe you are limited to a specific chip due to ...
   Dec 17, 2024
7. Adjust tempco in size and sign
   Michael Wyatt
   Circuits Analogue Design Tools and Technologies Analog Devices AD590KR
   Zeroing out temperature variations on a production line is a challenging task when the device to be compensated has a temperature coefficient that varies in both magnitude and sign from unit to unit. This simple circuit can meet the challenge (see ...
   Dec 13, 2024
8. Precise photovoltaic I-V characterization
   Aaron Schultz Catherine Chang Henry Surtihadi
   Circuits Measurement Analog Devices LTC2058
   Introduction Photovoltaic (PV) modules are popular and affordable sources of renewable energy. Most photovoltaic modules last about 20 years, but thermal stress and moisture ingress, among other causes, can degrade a module’s output power ...
   Nov 6, 2024
9. 80 MHz VFC with prescaler and preaccumulator
   Stephen Woodward
   Circuits Measurement Analog Devices LT1027
   In 1986, famed analog innovator Jim Williams, in “Designs for High Performance Voltage-to-Frequency Converters” ( Reference 1 ) published his 100 MHz “King Kong” VFC. If anyone’s ever done a faster VFC, I haven’t ...
   Oct 28, 2024
10. DC-accurate, 32-bit DAC achieves 32-bit resolution
    Stephen Woodward
    Circuits Measurement Analog Devices AD586 LTC1151
    Some applications, such as ADC testing and calibration, require a DAC with extremely good resolution, monotonicity, accuracy, and resolution. In these categories of performance, the circuit in Figure 1 is hard to beat. Its typical specifications ...
    Oct 21, 2024

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