آر اف (فرکانس رادیویی) و بی‌سیم مدولاتور آر اف

Product Attributes

Introduction

The CMX993 and CMX993W are integrated, low voltage quadrature (1/Ω) modulator ICs suitable for use in applications operating from 30MHz to 1000MHz. The devices integrate two matched double balanced mixers driven from a buffered and quadrature split local oscillator. The LO frequency is divided by either 2 or 4. The mixers form an 1/Q vector modulator with programmable gain stages offering up to 30dB of gain, controlled in 2.5dB steps. Uncommitted low frequency differential amplifiers are provided for users to configure. These may be used to implement functions such as filtering, differential- to single-ended signal conversion and level shifting. The CMX993W product variant offers wide-bandwidth operation. A digital control interface, C-BUS, (an SPI compatible interface) allows gain control as well as power management of individual internal blocks to optimise system performance. The C-BUS interface operates from its own supply domain enabling the device to be interfaced to different voltage baseband devices. The CMX993 and CMX993W devices are supplied in RF optimised VQFN packages.

Features

• 30MHz to 1GHz Operating Frequency
• Wide Band Noise –148dBc/Hz
• Noise Floor –155dBm/Hz
• Programmable 30dB Output Gain Range
• +3dBm (PEP) Output Power
• Low LO Drive Requirements, -15dBm
• Uncommitted Amplifiers for Filtering and Interfacing
• CMX993W – Wide Bandwidth Version (>50MHz I/Q Bandwidth)
• C-BUS (SPI Compatible) Serial Interface
• Low Voltage 3.3V Operation
• Small 7x7mm VQFN Package (Q3)
• +25dBm Equivalent Output IP3

Applications

• APCO P25, Wireless Data
• ISM Transmitters
• Digital TV/CATV Modulators
• Wireless LAN, Wireless Local Loop
• IF or RF Modulators
• FSK, GMSK, 4FSK, C4FM QPSK, QAM, SSB, OFDM, Multi-carrier Systems SDR (Software Defined Radios)
• WiMAX Systems
• OFDM/COFDM Systems
• Satellite Communications
• Cellular Picocell / Nanocell Systems
• RF Channel Bandwidths up to 100MHz