Circuits & Schematics Analog Devices - 2

11. 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
12. 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

13. 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
14. 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
15. 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
16. 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
17. 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
18. 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
19. 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
20. 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

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