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부품번호 CMX993 기능
기능 Quadrature Modulator
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CMX993 데이터시트, 핀배열, 회로
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
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




CMX993 pdf, 반도체, 판매, 대치품
Quadrature Modulator
2 Block Diagrams
CMX993/CMX993W
A1QP
A1QN
A1QO
A2QP
A2QO
MODQP
MODQN
MODIN
MODIP
A2IO
A2IP
A1IO
A1IN
A1IP
Input
Amplifier
Filter
Amplifier
Divide by 2
or
Divide by 4
Mixer
Gain
Control
Bandgap
Filter
Amplifier
Input
Amplifier
CMX993
C-BUS
Control
Interface
VCC1
VCC2
VCC3
VCC4
VCC5
VCC6
VCC7
Ground VEE
VDD
DVSS
MOP
MON
VREF
BVREF
VDDIO
CDATA
CSN
SCLK
RESETN
100k
External Reset
Figure 1 CMX993 Block Diagram
A1QP
A1QN
A1QO
A2QP
A2QN
A2QO
MODQP
MODQN
MODIN
MODIP
A2IO
A2IN
A2IP
A1IO
A1IN
A1IP
Input
Amplifier
Filter
Amplifier
Divide by 2
or
Divide by 4
Mixer
Gain
Control
Bandgap
Filter
Amplifier
Input
Amplifier
CMX993W
C-BUS
Control
Interface
VCC1
VCC2
VCC3
VCC4
VCC5
VCC6
VCC7
Ground VEE
VDD
DVSS
MOP
MON
VREF
BVREF
VDDIO
CDATA
CSN
SCLK
RESETN
100k
External Reset
Figure 1a CMX993W Block Diagram
2013 CML Microsystems Plc
4
D/993/10

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CMX993 전자부품, 판매, 대치품
Quadrature Modulator
4 External Components
CMX993/CMX993W
4.1 Power Supply Decoupling
The CMX993/CMX993W has separate supply pins for the analogue and digital circuitry; a 3.3V nominal
supply is recommended for all circuits but a different voltage for VDDIO may be used (see section 5.4).
+3.3V (Digital)
+3.3V
(Analogue)
R9
R8
R7
R6
R5
R4
R3
R1
VDDIO
VDD
VCC1
VCC2
VCC3
VCC4
VCC5
VCC6
VCC7
GND
C9 C8 C7 C6 C5 C4 C3
Digital Ground for
VDDIO and VDD
C1
Analogue
Ground Pad
Figure 2 Power Supply Connections and Decoupling
C1 10nF
C3 10nF
C4 10nF
C5 10nF
C6 10nF
C7 10nF
C8 10nF
C9 10nF
R1 3.3
R3 10
R4 3.3
R5 3.3
R6 3.3
R7 3.3
R8 10
R9 100
Resistors 5%, capacitors and inductors 20% unless otherwise stated
Note:
It is expected that low frequency interference on the 3.3V supply will be removed by active regulation; a
large capacitor is an alternative but may require more board space and so may not be preferred. It is
particularly important to ensure that there is no interference from VDDIO (which supplies the digital I/O) that
might affect the sensitive analogue supplies, like VCC1, VCC2 etc. The supply decoupling shown is
intended for RF noise suppression. It is necessary to have a small series impedance prior to the
decoupling capacitor for the decoupling to work well; this may be cost effectively done with the resistor and
capacitor values shown. The use of resistors results in small dc voltage drops (up to approx 0.1V).
Choosing resistor values approximately inversely proportional to the dc current requirements of each
supply ensures the dc voltage drop on each supply is reasonably matched. In any case, the dc voltage
change that results is well within the design tolerance of the device. If higher impedance resistors are used
then greater care will be needed to ensure the supply voltages are maintained within tolerance, including
when parts of the device are enabled or disabled.
2013 CML Microsystems Plc
7
D/993/10

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