Circuits & Schematics Analog Devices

1. Digital pot can control gain over a 90 dB span like an electromechanical
   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. ...
   03-09-2024
2. LED drivers minimize power dissipation
   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 ...
   27-08-2024

3. Floating output, variable potential battery simulator
   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 ...
   22-08-2024
4. Simple discrete SE-to-differential precision in-amp circuit: High common-mode input range and 50% less power
   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 ...
   08-08-2024
5. Temperature compensated lead acid battery float charger
   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 ...
   05-08-2024
6. Single cell V-F converter
   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 ...
   31-07-2024
7. High stability quartz stabilized V-F converter
   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 ...
   30-07-2024
8. Measure an optocoupler's CTR
   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 ...
   25-07-2024
9. Low-power ambient light sensing LED driver, with hibernate mode
   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 ...
   22-07-2024
10. Precision programmable current source uses two ICs
    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 ...
    17-07-2024

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