آر اف (فرکانس رادیویی) و بی‌سیم سایر آی سی‌ و ماژول‌های آر اف

Product Attributes

Introduction

The RCA-CA3179E is an integrated-circuit prescaler intended for use in communications and instrumentation systems. It performs division by 256 in the uhf mode and division by 64 in the yhl mode. The mode of operation is selected by means of the bandswitch and the separate uhf and vhf input terminals provided. Either single- or double-ended inputs can be applied. These inputs are normally ac coupled, but dc coupling can be used if the specified bias levels are maintained. The output is a complementary amitter-coupled stage capable of driving a 33-pF or equivalent load. The harmonic output is reduced above 40 MHz by limiting output-signal rise and fail times and by maintaining a balanced load. In the uht mode, which is activated by applying a high level (logical 1) to the bandswitch input terminal, all eight divider stages are operative, resulting in division by 256. In the vht mode, activated by a low level (logical 0) at the vhf input terminal, two divider stages are bypassed, resulting in division by 64. An internal amplifier/multiplexer provides this control while isolating both inputs, amplifying the input signal, and improving sensitivity. The CA3179E is supplied in the 14-load duat-in-line plastic package.

Features

• 14-Load Dual-In-Line Plastic Package "E"-Suffix Type
• Typical broadband operation - dc to 1 GHz
• High sensitivity
• Standard ±rαL or ECl power supply
• Dual-mode operation - VHF/UHF (=841÷250)
• Complementary ECl outputs
• Independent VHF and UHF input terminals

Applications

• Digital frequency synthesizers for: VHF/UHF receivers, Satellite communications instrumentation
• High-frequency divider for: UHF frequency counters, UHF timers, High-speed computers, Frequency standards, SHF second IF local-oscillator injection, PCM communications, Satellite communications, Radar ranging systems
• High-frequency up-converters