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PDF CMX991 Data sheet ( Hoja de datos )
| Número de pieza | CMX991 | |
| Descripción | RF Quadrature Transmitter and RF Quadrature/Low IF Receiver | |
| Fabricantes | Consumer Microcircuits Limited | |
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CMX991/CMX992
CML Microcircuits RF Quadrature Transmitter and
COMMUNICATION SEMICONDUCTORS RF Quadrature/Low IF Receiver
D/991_992/20 February 2015
Provisional Issue
This document describes two separate, high performance, RF ICs covering the range: 100MHz1 to 1GHz.
The CMX991 is an RF Quadrature Transceiver and the CMX992 is an RF Quadrature Receiver.
Features
Rx (CMX991 and CMX992)
o RF mixer with output select
o 1st IF input select
o Selectable low IF outputs
(450kHz/455kHz)
o 1st IF Variable Gain Amplifier (VGA)
o 1st IF Signal Level Indicator (SLI)
o Two-mode demodulator
o I/Q Zero-IF with differential outputs
Tx (CMX991 only)
o I/Q modulator to IF
o Image-reject up-converter
o IF and RF outputs
IF (CMX991 and CMX992)
o IF LO synthesiser
o IF VCO negative resistance amplifier
3.3V low power operation
Applications
Analogue/digital multimode radio
Software Defined Radio (SDR)
Portable, mobile and base station terminals
Data telemetry modems
TETRA (CMX992)
ETSI: EN 300 113, EN 301 166, EN 302 561,
EN 300 220, TS 102 361 (DMR)
Automatic Identification System (AIS)
transponders
Constant envelope and linear modulation
Compatible with CMX998 (CMX992 only)
Narrowband: e.g. 25kHz, 12.5kHz, 6.25kHz
Wideband: up to 2MHz
APCO Project 25 (P25) Phase 1 and Phase 2
TDMA: TIA-102.CAAB
Satellite communications
1 Brief Description
The CMX991 is a single-chip, high performance, RF transceiver that provides the core functions required
to implement a full-featured radio transmitter and receiver. It operates from 100MHz to 1GHz and its I/Q
architecture supports multiple modulation types and bandwidths with a single radio design. The half-duplex
CMX991 integrates Tx modulators, Rx demodulators, IF PLL and IF VCO subsystems to minimise the
external circuits needed when implementing a complete transceiver. User-selected modes suit different
application requirements.
The Tx path includes an I/Q modulator to accurately generate modulation at the IF frequency, which may
then be translated to the final RF frequency by an integrated image-reject up-converter system. The I/Q
modulator IF output is also made available for conversion to RF via external circuits, if desired.
The Rx path includes an integrated 1st Rx mixer having two outputs to support two external 1st IF filter
choices, then an integrated 2:1 input mux followed by VGA and wideband signal level measurement
functions, to support AGC implementation. The 1st IF signal is then either I/Q demodulated to Zero-IF or
mixed to a Low IF output. The CMX991 provides differential and single-ended Rx output options and
differential amplifiers for flexible signal conditioning.
The CMX992 is a single-chip, high performance, RF receiver that includes the core RF and IF receive
functions of the CMX991 above and can be used in a wide range of narrowband and wideband wireless
products, including multi-mode analogue/digital terminals.
The CMX992 can be used where highly linear modulations are being used, e.g. for applications such as
TETRA, where a typical transmitter solution would include the CMX998 Cartesian Feedback Transmitter.
Both devices operate from a single 3.3V supply over a temperature range of -40°C to +85°C and are
available in 48-pin VQFN (Q3) packages.
1 The CMX991/CMX992 may be used at lower frequencies by using appropriate external components. Use below 100MHz is
covered in a separate application note available from the CML website.
2015 CML Microsystems Plc
1 page  
RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
Figure 24 Typical SLI Performance.................................................................................. 40
Figure 25 Typical SLI Performance in an Application Circuit (EV9920B)......................... 40
Figure 26 IF Output Response with and without Blocking Signal Present ....................... 41
Figure 27 Typical Receiver I/Q Frequency Response...................................................... 42
Figure 28 Tx Output with 9.6kbps GMSK from an EV9100.............................................. 43
Figure 29 Transmitter Path IF Filters ............................................................................... 45
Figure 30 Transmitter IF Output Showing Filter Responses with IFH bit = ‘1’ ................. 45
Figure 31 Effect of IFH on 45MHz and 60MHz Transmitter IF Filters .............................. 46
Figure 32 C-BUS Timing .................................................................................................. 55
Figure 33 Q3 Mechanical Outline:.................................................................................... 56
2015 CML Microsystems Plc
5
D/991_992/20
5 Page 
RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
4.2 Receiver (CMX991 and CMX992)
The receiver relies on an external LNA, filtering and a transmit/receive switch; details can be found in
section 5.2.
4.2.1 Rx 1st Mixer
The Rx 1st Mixer has a differential input with a nominal impedance of 300 and series capacitance of 8pF.
To ensure optimum performance a balun is required when driving from typical single-ended (un-balanced)
LNAs or filters. The balun may be a transformer type or implemented using LC networks. A typical
matching circuit to the Rx 1st Mixer is shown in Figure 6. In a particular implementation the shunt resistors
R1 and R2 may be replaced by a single component across the balun T1 output. The blocking capacitors
C3 and C4 may be omitted if the input signals are 0V dc biased. DC should not be applied to the input
pins, otherwise damage to the internal protection diodes may result.
Input
L1
L2
T1
R1
C3
MIXINP
C4
MIXINN
CMX991
CMX992
R2
Figure 6 Example External Components – Receive 1st Mixer Input
L1 27nH
C3 1nF
C4 1nF
L2 33nH
T1 TC1-1-13M+
R1 and R2 NF
Table 4 Typical Rx 1st Mixer Input Matching Components for 455MHz
2015 CML Microsystems Plc
11
D/991_992/20
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CMX991.PDF ] | |
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