CMX975 converter Datasheet

CMX975 Datasheet, PDF, Equivalent


Part Number

CMX975

Description

2.7GHz Up/Down converter

Manufacture

CML

Total Page 30 Pages
Datasheet
Download CMX975 Datasheet


CMX975
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX975
2.7GHz Up/Down-converter,
LNA, Dual PLL + VCO
CMX975 2.7GHz Tx/Rx Mixers, LNA, RF Frac-N Synth, IF Integer-N Synth + VCOs
D/975/2 March 2018
DATASHEET
Provisional Information
Features
1 to 2.7 GHz Up/Down-converter
Configurable image reject or normal mode Rx mixer
Configurable sideband suppression or normal mode Tx
mixer
Combine with CMX973 to implement RF-to-I/Q
transceiver
1 to 2.7 GHz RF / 10 to 500 MHz IF
Integrated LNA
1.7dB noise figure at 1.5GHz
18dB programmable gain range
RF synthesiser/PLL
Fractional-N 24-bit divider
Output range 350MHz 3.6GHz
Programmable output divider
Fast lock function
Programmable charge pump current
IF synthesiser/PLL
Integer-N 14-bit divider
Output range 31MHz 1GHz
Programmable output divider
-209dBc/Hz normalised phase noise
Integrated low noise LDO regulator
Single 2.7V to 3.6V supply
1.8V digital interface supported
C-BUS configurable
-40° to +85° operating temp. range
Small outline 6mm x 6mm VQFN package
Applications
L-Band / S-Band satcom
Military radio
Wireless microphone
2.4GHz ISM transceiver
Wireless modem
General purpose RF / IF
MCLK
TXINN
TXINP
RFIN
Fractional-N
PLL
CMX975
Integer-N
PLL
LNAIN
LNASOURCE
Power Supply
2018 CML Microsystems Plc
RF Synthesiser
Divide by:
2, 4, 6 or 8
Divide by:
1,2,4,6 or 8
LOOUT
Divide by: Tx Mixer
1, 2 or 4
TXOUTP
TXOUTN
Rx Mixer
Divide by:
1, 2 or 4
RXIFP
RXIFN
IF Synthesiser
Divide by:
1, 4, 8 or 16
IFPLLOUT
LNA
LNAOUT
Control Registers
C-BUS

CMX975
2.7GHz Up/Down-converter, LNA, Dual PLL + VCO
CMX975
1 Brief Description
The CMX975 is an RF building block IC that provides multiple functions consisting of: RF PLL/VCO, IF PLL/VCO, Transmit
Up-convert mixer, Rx Down-convert mixer, and LNA.
The RF high frequency synthesiser employs a Fractional-N design and will operate at up to 3.6GHz using a fully-integrated
internal VCO or at up to 6GHz with an external frequency source. The IF synthesiser employs an integer-N design and will
operate at up to 1GHz. It has an integrated VCO requiring only an external inductor to set the frequency. Internal dividers
and buffers are provided for each synthesiser/PLL allowing a wide range of frequency generation options.
The Rx mixer can be configured in image reject or normal mode and the Tx mixer can be configured in sideband
suppression or normal mode. The integrated LNA offers 18dB of gain reduction in three steps of 6dB.
The CMX975 has been designed to work with CML’s CMX973 Quadrature Modulator/Demodulator to provide a simple
and cost effective high-frequency superhet transceiver operating in the range 1 to 2.7 GHz. The device operates from a
single supply voltage and is available in a small 6x6mm VQFN package.
Section
1
1.1
2
3
3.1
3.1.1
3.1.2
3.1.3
4
4.1
4.2
5
6
7
7.1
7.2
7.3
7.3.1
7.4
7.4.1
7.5
7.5.1
7.5.2
7.6
7.6.1
7.6.2
7.6.3
7.6.4
7.6.5
7.7
7.7.1
7.7.2
7.7.3
7.7.4
7.7.5
7.8
7.8.1
7.8.2
CONTENTS
Page
Brief Description....................................................................................................................................................... 2
History ...............................................................................................................................................................................5
Block Diagram .......................................................................................................................................................... 6
Performance Specification ........................................................................................................................................ 7
Electrical Performance ......................................................................................................................................................7
Absolute Maximum Ratings ..............................................................................................................................................7
Operating Limits ................................................................................................................................................................7
Operating Characteristics ..................................................................................................................................................8
Pin and Signal Definitions ....................................................................................................................................... 18
Pin List .............................................................................................................................................................................18
Signal Definitions.............................................................................................................................................................19
Power Supply and Decoupling ................................................................................................................................ 20
Layout Recommendations ...................................................................................................................................... 21
Detailed Description ............................................................................................................................................... 22
Power Management........................................................................................................................................................22
Clock Generator...............................................................................................................................................................22
Tx (Up-conversion) Mixer ................................................................................................................................................22
Matching Circuits.............................................................................................................................................................25
Rx (Down-conversion) Mixer ...........................................................................................................................................27
Matching Circuits.............................................................................................................................................................29
Low Noise Amplifier (LNA)...............................................................................................................................................31
LNA S-parameters............................................................................................................................................................31
Matching Circuits.............................................................................................................................................................32
RF VCO and Fractional-N PLL ...........................................................................................................................................33
RF Fractional-N Synthesiser.............................................................................................................................................33
Register Loading Order....................................................................................................................................................34
Fractional-N Programming Example................................................................................................................................34
Loop Filter .......................................................................................................................................................................35
RF VCO.............................................................................................................................................................................36
IF PLL and VCO.................................................................................................................................................................37
IF PLL ...............................................................................................................................................................................37
Programming Example ....................................................................................................................................................38
IF VCO..............................................................................................................................................................................38
IF PLL Output ...................................................................................................................................................................40
IF PLL Divider ...................................................................................................................................................................40
Local Oscillator (LO).........................................................................................................................................................41
LO Input (LOIN)................................................................................................................................................................43
LO Output (LOOUT) .........................................................................................................................................................43
2018 CML Microsystems Plc
2
D/975/2


Features CML Microcircuits COMMUNICATION SEMICOND UCTORS CMX975 2.7GHz Up/Down-converter , LNA, Dual PLL + VCO CMX975 2.7GHz Tx /Rx Mixers, LNA, RF Frac-N Synth, IF In teger-N Synth + VCOs D/975/2 March 201 8 DATASHEET Provisional Information Features  1 to 2.7 GHz Up/Down-conve rter Configurable image reject or norma l mode Rx mixer Configurable sideband s uppression or normal mode Tx mixer Comb ine with CMX973 to implement RF-to-I/Q transceiver 1 to 2.7 GHz RF / 10 to 500 MHz IF  Integrated LNA 1.7dB noise figure at 1.5GHz 18dB programmable gain range  RF synthesiser/PLL Fractiona l-N 24-bit divider Output range 350MHz – 3.6GHz Programmable output divider Fast lock function Programmable charge pump current  IF synthesiser/PLL Int eger-N 14-bit divider Output range 31MH z – 1GHz Programmable output divider  -209dBc/Hz normalised phase noise  Integrated low noise LDO regulator  Single 2.7V to 3.6V supply  1.8V digital interface supported  C-BUS configurable  -40° to +85° operating temp. ra.
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