مدار مجتمع (آی سی) آی‌سی صوتی ویژه

Product Attributes

Introduction

The CMX138A is a half-duplex, audio scrambler and sub-audio signalling processor IC for Analogue Twoway Radio applications. This makes it a suitable device for the leisure radio markets (FRS, MURS, PMR446 and GMRS). This device provides a user programmable frequency inversion audio scrambler, companding and pre/deemphasis – performing simultaneous processing of Sub-audio and In-band signalling. Other features include an auxiliary ADC channel and an auxiliary DAC interface (with optional RAMDAC, to facilitate transmitter power ramping). The device has flexible powersaving modes and is available in a 28-pin (E1) TSSOP package.

Features

• Programmable Audio Scrambler
• Concurrent Audio/Signalling Operations
• Full Audio-band Processing: Pre and De-emphasis, Compandor, Scrambler and Selectable 2.55/3 kHz Filters
• Auxiliary ADC and Auxiliary DAC
• C-BUS Serial Interface to Host µController
• Two Analogue Inputs (Mic or Discriminator)
• Selectable Audio Processing Order
• Sub-audio Signalling: CTCSS, DCS
• Auxiliary System Clock Output
• Tx Output for Single-point Modulation
• Low-power (3.0V to 3.6V) Operation
• Flexible Powersave Modes
• Available in 28-pin TSSOP Package