Circuits & Schematics Analog Devices

1. 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
2. 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

3. 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
4. Digital pot can control gain over a 90 dB span like an electromechanical
   Stephen Woodward
   Circuits Amplifiers Analog Devices OP37
   A short while back, I published a design idea ( Ref. 1 ) that uses a single linear pot to control the gain of a high performance OP37 decompensated op-amp over an unusually wide ( 30 dB to +60 dB) range. Figure 1 shows the circuit. Figure 1. ...
   Sep 3, 2024
5. LED drivers minimize power dissipation
   Fons Janssen
   Circuits Supply Light Analog Devices MAX1951
   One option for driving high-brightness LEDs uses the standard stepdown buck converter (Figure 1). The sense resistor, R S , generates a feedback voltage, V FB , that sets the desired LED current, I LED , according to the equation Figure 1. A ...
   Aug 27, 2024
6. Floating output, variable potential battery simulator
   Jim Williams
   Circuits Measurement Supply Analog Devices LT1010 LT1012 LT1021
   Battery stack voltage monitor development ( Reference 1 ) is aided by a floating, variable potential battery simulator. This capability permits monitor accuracy verification over a wide range of battery voltage. The floating battery simulator is ...
   Aug 22, 2024
7. Simple discrete SE-to-differential precision in-amp circuit: High common-mode input range and 50% less power
   Chau Tran Jordyn Rombola
   Circuits Analogue Design Measurement Analog Devices AD629 AD7685 AD8421 ADA4807-2
   There are many applications where an ADC needs to process a small differential input signal in the presence of a large common-mode signal. Traditional instrumentation amplifiers (in-amps) are not commonly used in these applications, due to their ...
   Aug 8, 2024
8. Temperature compensated lead acid battery float charger
   Dave Conrad
   Circuits Supply Analog Devices LT1086
   Editor’s note:Battery charging in a float or maintenance mode has been around for a while, especially for standby power, emergency lighting, telecom, uninterruptible power, and other critical power needs. The float method of charging is a ...
   Aug 5, 2024
9. Single cell V-F converter
   Jim Williams
   Circuits Analogue Design Measurement Analog Devices LT1017
   High speed and precision are not the only areas where special V-F circuits are needed. Figure 1 shows a circuit which runs from a single 1.5 V cell with only 125 µA current drain. The circuit uses an LT1017 dual micropower comparator in a ...
   Jul 31, 2024
10. High stability quartz stabilized V-F converter
    Jim Williams
    Circuits Measurement Analog Devices LM199 LT1001 LT1011 LT1056 LTC1043
    The gain temperature coefficient of conventional V-F circuits is affected by drift in the charge pumping capacitors. Although compensation schemes are employed to minimize the effect of this drift, another approach is required to get significantly ...
    Jul 30, 2024

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