CMX993 Datasheet, PDF (1/26 Pages) CML Microcircuits – Programmable 30dB Output Gain Range

CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX993/CMX993W
30MHz – 1GHz
Quadrature Modulator
D/993/10 February 2013
Provisional Issue
This document describes two separate, high performance, RF quadrature modulator ICs:
The standard CMX993 and the wide bandwidth CMX993W product variant.
Features
Applications
 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
 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
Input Amplifiers
I Channel
Filter/Interface
Amplifiers
Q Channel
I/Q Mixer and Gain Control
I/Q MOD Output
LO Input
Divide by 2
0°
or
Divide by 4
90°
Bandgap
Control
Interface
VREF
C-BUS
1 Brief Description
The CMX993 and CMX993W are integrated, low voltage quadrature (I/Q) 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 I/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.
 2013 CML Microsystems Plc