Wave-shaping IC enables efficient data transmission

New Japan Radio Co. Ltd has introduced the NJM2299, a wave-shaping IC that is suitable for converting the analog output waveform of IF detector circuits in specific extremely low-power radio equipment into digital data.

The NJM2299 is a wave-shaping circuit that consists of an operational amplifier for active filters, a peak detection circuit, a comparator and a bias circuit.

Although wireless ICs incorporating a wave-shaping circuit are available, they feature a slow response, and if "00" and "FF" are input consecutively, the waveform could lose shape. To solve this, the NJM2299 employs a quick battery-charging function to deliver rapid response when the power is ON. Moreover, while maintaining analog waveform peak value detection, the NJM2299 also reduces data reading errors in weak electric fields (reduction of bit-error-rate), and increases accuracy when reading consecutive identical bits. Increasing response speed when the power is turned ON means improved response speed for intermittent reception. As a result, the NJM2299 enables data transmission without wasting power.

Key features of the NJM2299 include:

• Low-voltage operation: 1.8-5.5V

• Low current consumption

• Power save (PS) OFF: 600?A typ. (V=2V, at no signal)

• PS ON: 13?A typ. (V= 2V, at no signal)

• Input bias current: 50nA typ.

• Bipolar technology

• Packaging: TVSP-10 (2.9-by-4-by-1mm)

The NJM2299 wave-shaping IC is available in sample and production quantities. Pricing is $129 per unit.