PLL clock IC replaces expensive crystal oscillators
21 September 2005
Analogue, Mixed Signal, LSI
ON Semiconductor has released to market a phase lock loop (PLL) IC designed to replace expensive crystal oscillators for clock generation in a variety of consumer and networking applications. A pioneer of PECL (positive emitter coupled logic) signalling, ON Semiconductor claims that its latest family of PLL ICs offers performance compatible to the most widely-used crystal oscillators at a fraction of the cost.
For applications ranging from VGA graphics cards to Fibre Channel clock generation, the traditional method for generating the master clock signal has been to implement a single crystal oscillator. Historically, crystal oscillators have offered better jitter performance than silicon-based devices. These canned oscillators are complex to manufacture, and so, are relatively expensive and require long lead times.
ON Semiconductor says the new NB4N507A is a high-performance silicon PLL that delivers jitter performance comparable to crystal oscillators but offers far more design flexibility, a lower overall cost and greatly reduced lead times. With accuracy of 100 parts per million (ppm), the NB4N507A is a preferable alternative to crystal oscillators with similar stability.
The NB4N507A generates a clock signal ranging from 50 MHz to 200 MHz via an inexpensive reference crystal. With a maximum RMS period jitter of less than 10 ps, it delivers half the jitter (or noise) of standard silicon PLL products. Being fully configurable, it also provides design flexibility. For example, says the manufacturer, a single device can be used to generate different frequencies within a system and can be re-used on future designs regardless of changes in timing requirements. In addition, silicon-based ICs like the NB4N507A are inherently much simpler to manufacture which leads to lower costs and lower lead times. The NB4N507A comes in a 16-pin SOIC package.
Further reading:
High-speed PIN diode
Altron Arrow
Analogue, Mixed Signal, LSI
Vishay’s new high-speed Silicon PIN diode is able to detect both visible and near infra-red radiation over a wide spectrum range from 350 to 1100 nm.
Read more...
Analogue front end for sensor measurements
Electrocomp
Analogue, Mixed Signal, LSI
The NJU9103 AFE from Nisshinbo is a tiny analogue front end, with a 16-bit resolution ADC and up to 512 x signal amplification from the programmable gain amplifier.
Read more...
Single-channel software configurable I/O
Altron Arrow
Analogue, Mixed Signal, LSI
These use cases of the AD74115H include analogue output and input, digital output and input, resistance temperature detector (RTD), and thermocouple measurement capability.
Read more...
Current-sense amplifier with PWM rejection
Altron Arrow
Analogue, Mixed Signal, LSI
Analog Devices’ AD8410A is a high voltage, high bandwidth current-sense amplifier that features an initial gain of 20 V/V and a 2,2 MHz bandwidth.
Read more...
Combining a LPF and ADC driver for a 20 Vp-p signal
Altron Arrow
Analogue, Mixed Signal, LSI
A mixed-signal ADC driver circuit’s optimum performance depends on multiple variables: the driver’s settling time, the RC filter’s time constant, driving impedance, and the ADC sampling capacitor’s kickback current, all interact during acquisition time and contribute towards sampling errors.
Read more...
Pressure sensor with NextNav certification
EBV Electrolink
Analogue, Mixed Signal, LSI
STMicroelectronics’ LPS22DF pressure sensor has received a NextNav certification, which guarantees performance and reliability for geolocation and other types of applications.
Read more...
Reference design for Raspberry Pi analogue I/O
Analogue, Mixed Signal, LSI
Analogue Devices has published a reference design for ±10 V analogue input and ±15 V analogue output for Raspberry Pi platforms.
Read more...
Multi-zone distance sensor with 90° field of view
Avnet Silica
Analogue, Mixed Signal, LSI
STMicroelectronics has revealed a new FlightSense multi-zone distance sensor, with 90° field of view, to bring lifelike situational awareness to applications like home automation, computers, robots, and smart equipment.
Read more...
Six-axis IMU with Qvar sensing channel
Altron Arrow
Analogue, Mixed Signal, LSI
The LSM6DSV16X from STMicroelectronics is a high-performance, low-power six-axis IMU, featuring a three-axis digital accelerometer and a three-axis digital gyroscope.
Read more...
Bidirectional current-sense amplifier with PWM
RS South Africa
Analogue, Mixed Signal, LSI
The MAX49925 from Analogue Devices is a bidirectional current-sense amplifier (CSA) with an input common-mode range that extends from -40 to 76 V, making it suitable for 48 V HEV applications where there are large automotive transients.
Read more...
printer friendly version