Counters and Timer Circuits

AN79 Linear Technology AN79 modifies methods presented in AN74, allowing for the verification of 30 nanosecond amplifier settling times with 0.1% resolution. The sampling-based technique used is detailed, and results are presented. Appendices cover oscilloscope overdrive issues, the construction of a sub-nanosecond rise time pulse generator, and amplifier compensation, along with circuit construction and calibration procedures. The 555 timer serves as a handy voltage-to-time converter, as described in the circuit of Figure 1. This low-cost voltage-to-time converter utilizes the common 555 timer chip. The monostable multivibrator configuration allows for the analog voltage input to connect to the charging resistor, R, instead of VCC. Additionally, the 555 timer can function as an A/D converter for accurate voltage measurements using a microcontroller, including a sample program for the Parallax Basic Stamp. The 555 timer monostable circuit can be employed to activate a relay for a predetermined duration by pressing a momentary normally open push button. The left circuit is suitable for longer durations. Furthermore, a low-cost 6-digit frequency counter module design is presented, which utilizes off-the-shelf components and is not reliant on the expensive 74C926. The standard configuration directly displays frequency in Hz (up to 1MHz), with an onboard divider allowing for direct display in KHz (approximately 40MHz max). The display reads directly in frequency. Lastly, the 74ACT74 serves as a low-skew clock divider, which is beneficial in serial-data systems that generate an internal clock at twice the data rate for mid-bit sampling or bi-phase code generation. External equipment and some internal processes require a clock operating at the data rate, which can be achieved by simply dividing the twice-rate clock using a flip-flop. The 80186 microprocessor includes timer pins that provide general I/O capabilities, integrating 15 to 20 common iAPX86 system components, such as a DMA controller, interrupt controller, timers, clock generator, bus interface, and chip-select logic onto a single chip.

The AN79 application note from Linear Technology builds upon the previous work in AN74, focusing on amplifier settling times and their verification to a high degree of precision. The document outlines a sampling-based technique that allows engineers to measure and confirm the performance of amplifiers, particularly in high-speed applications. The appendices provide practical insights into oscilloscope overdrive issues, which are critical for accurate signal measurement during high-speed transitions. The construction of a sub-nanosecond rise time pulse generator is also detailed, which is essential for testing the response times of fast amplifiers.

The use of the 555 timer in various applications is highlighted, showcasing its versatility as a voltage-to-time converter. This configuration can be particularly useful in applications where precise timing is required based on an analog voltage input. By modifying the standard 555 timer circuit, engineers can create a reliable monostable multivibrator that responds to varying voltage levels, thus expanding the functionality of the 555 timer beyond traditional uses.

The 6-digit frequency counter module described offers a cost-effective solution for frequency measurement, utilizing readily available components. The design allows for easy integration into various projects requiring frequency counting, displaying results directly in Hertz or Kilohertz, facilitating quick and accurate readings.

The 74ACT74 flip-flop serves a crucial role in clock division, making it an integral component in systems that require synchronization of data rates. By using this flip-flop, engineers can ensure that their systems operate efficiently, maintaining the integrity of data transmission.

Lastly, the 80186 microprocessor's integration of multiple system components into a single chip simplifies design complexity in embedded applications. Its timer pins provide general-purpose I/O functionality, enhancing its utility in various electronic designs. Overall, the described circuits and components reflect a comprehensive approach to modern electronic design challenges, offering practical solutions for engineers in the field.AN79 Linear Technology AN79 modifies methods presented in AN74, permitting verification of 30 nanosecond amplifier settling times to 0. 1% resolution. sampling-based technique used is detailed and results presented. Appendices cover oscilloscope overdrive issues, construction of a subnanosecond rise time pulse generator, amplifier compensation,

circuit construction and calibration procedures. 555 Makes Handy Voltage to time Converter : 02/01/01 EDN-Design Ideas. The circuit in Figure 1 is a simple, low-cost voltage-to-time converter using ubiquitous 555 timer chip. You can use IC`s monostable multivibrator as a voltage-to-time converter by connecting analog-voltage input to charging resistor, R, instead of connecting R to VCC.

With this modification, . 555 Timer as an A/D Converter : Measure voltages accurately with a microcontroller using this simple circuit. Includes sample program for Parallax Basic Stamp 555 timer Mono stable (one shot) circuit : The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button.

The circuit on the left can be used for long time. 6 Digit 40MHz Frequency Counter Module : Here is design for a very low cost 6-digit frequency counter module using of shelf components (and not that expensive 74C926!). The standard circuit will display directly in Hz (1MHz max), and re is a separate on board divider that will allow you to display directly in KHz (approx 40MHz max).

Because display reads directly in. (add 11/05) 74ACT74 makes Low-skew clock divider : 12/17/98 EDN-Design Ideas - Serial-data systems often generate an internal clock at twice data rate for mid-bit sampling or for generating bi-phase codes. External equipment and some internal processes require a clock that runs at data rate. Simply dividing twice-rate clock with a flip-flop generates a data-rate clock that is. 80186 timer pins provide general I/O : 08/03/98 EDN-Design Ideas Intel`s ( 80186 is a highly integrated mP common in embedded applications.

It combines 15 to 20 common iAPX86 system components, such as a DMA controller, an interrupt controller, timers, a clock generator, a bus interface, and chip-select logic on one chip. Unfortunately, unlike many mCs, it provides. 🔗 External reference