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

Product Attributes

Introduction

The highly-integrated Baseband Signalling Processor ICs CMX7032 and CMX7042 fulfil the requirements of the Class A and Class B Marine Automatic Identification System (AIS) transponder market. The CMX7042 is identical in functionality to the CMX7032 with the exception that the two on-chip RF Synthesisers have been deleted, which enables it to be supplied in a smaller package.

The AIS system allows ships and base stations to communicate their position and other data to each other without the need for a centralised controller. This allows vessels to “see” each other and take appropriate action to avoid collision and so improve marine safety. The system uses a GMSK 9600 baud data link in the Marine VHF radio band. The system requirements are defined in ITU-R M.1371-4.

The two channel access mechanisms used by AIS (Self Organising Time Division Multiple Access (SOTDMA) and Carrier-Sensing Time Division Multiple Access (CSTDMA)) are both supported by the CMX7032/CMX7042.

The CMX7032/CMX7042 devices utilise CML’s proprietary FirmASIC component technology. On-chip sub-systems are configured by a Function Image: this is a data file that is uploaded during device initialization which defines the device's function and feature set. The Function Image can be loaded automatically from an external serial memory or from a host μcontroller over the built-in C-BUS serial interface. The device's functions and features can be enhanced by subsequent Function Image releases, facilitating in-the-field upgrades.

The CMX7032/CMX7042, when used with 7032/7042FI-1.x, is half duplex in operation, comprising two parallel Limiter-Discriminator Rx paths and one I/Q or two-point modulation Tx path. The Rx paths are configurable for AIS or DSC operation, the Tx for AIS only. The device performs signal modulation/demodulation with associated AIS functions, such as training sequence detection, NRZI conversion and HDLC processing (flags, bit stuffing/de-stuffing, CRC generate/check). Integrated Rx/Tx data buffers are also provided. This greatly reduces the processing requirements of the host μc. Provision of a number of auxiliary ADCs and DACs further simplifies the system hardware design, reducing the overall equipment cost and size.

Features

• Half-Duplex GMSK and FSK Modem
• AIS and DSC Data Format
• Optimum Co-channel and Adjacent-channel Performance
• Flexible Channel Configuration: – Two Simultaneous Rx – One Tx
• Low-Power (3.0V to 3.6V) Operation
• Limiter-Discriminator Rx Interface
• Flexible Tx Interface: I/Q or Two-point Modulation
• Auxiliary ADC and DAC Functions - 4 x (10-bit) DACs - 2 x (10-bit) ADCs
• Support for: Self Organising Time Division Multiple Access (SOTDMA) Carrier-Sensing Channel Access (CSTDMA) Operation
• Low Profile 64 or 48 pad Leadless VQFN and 64 or 48 pin LQFP Packages
• Configurable by Function Image
• Two RF Synthesisers (CMX7032 only)
• Two Auxiliary System Clock Generators

Applications

• Automatic Identification System (AIS) for Marine Safety
• AIS Aids-To-Navigation (AtoN)
• AIS Class A and B Transponders
• AIS Rx-only or Tx-only Modules