RF2905

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RF2905
Typical Applications Wireless Meter Reading Keyless Entry Systems 433/868/915MHz Band Systems Product Description
RF2905 monolithic integrated circuit intended cost transceiver. device provided 7mmx7mm, 48-lead plastic LQFP packaging designed provide fully functional transceiver. chip intended linear (AM, digital (ASK, FSK, OOK) applications North American 915MHz band European 433MHz 868MHz bands. integrated VCO, dual modulus/dual divide (128/129 64/65) prescaler, reference oscillator require only addition external crystal provide complete phase-locked oscillator.
433/868/915MHz FM/FSK/ASK/OOK TRANSCEIVER
Wireless Data Transceiver Wireless Security Systems Battery Powered Portable Devices
9.00 0.20 7.00 0.10
0.35 0.25
0.22 0.05
1.40 0.05
Dimensions
0.60 0.15
0.127
Optimum Technology Matching® Applied
GaAs MESFET CMOS SiGe Bi-CMOS
LOCK Lock Detector Select PRESCL CTRL CTRL RSSI DATA BP28 DEMOD MUTE
Package Style: LQFP-48,
Bi-CMOS InGaP/HBT
RESNTR-
GaAs SiGe HEMT
LOOP RESNTR+
Features Fully Monolithic Integrated Transceiver 2.7V 5.0V Supply Voltage Narrow Band Wide Band FM/FSK 300MHz 1000MHz Frequency Range 10dB Cascaded Noise Figure 10mW Output Power 433MHz
Gain Control
OUT+11 OUT-
Phase Detector Charge Pump Prescaler 128/129 64/65 Linear RSSI VREF
VREF
Ordering Information
RF2905 433/868/915MHz FM/FSK/ASK/OOK Transceiver RF2905 PCBA-L Fully Assembled Evaluation Board (433MHz) RF2905 PCBA-M Fully Assembled Evaluation Board (868MHz) Micro Devices, Inc. 7628 Thorndike Road Greensboro, 27409, (336) 1233 (336) 0454 http://www.rfmd.com
Functional Block Diagram
DESIGNS
021008
11-73
RF2905
Absolute Maximum Ratings Parameter
Supply Voltage Control Voltages Input Level Output Load VSWR Operating Ambient Temperature Storage Temperature
Ratings
-0.5 +5.5 -0.5 +5.0 50:1
Unit
Caution! sensitive device.
Micro Devices believes furnished information correct accurate time this printing. However, Micro Devices reserves right make changes products without notice. Micro Devices does assume responsibility described product(s).
Overall
Frequency Range 1000 1000 64/65 128/129 -100 Reference Frequency Crystal Charge Pump Current
Section
Frequency Range Prescaler divide ratio Prescaler Output Impedance Phase Noise
Power Control Range Power Control Sensitivity Deviation
Modulation Frequency Modulation Frequency Maximum Power Level
Transmit Section
1.5:1
loop filter bandwidth
Antenna Port Impedance Antenna Port VSWR Modulation Input Impedance Harmonics Spurious
Overall Receive Section
Frequency Range Cascaded Voltage Gain Cascaded Noise Figure Cascaded Input
Sensitivity Leakage RSSI Output Range RSSI Sensitivity RSSI Dynamic Range
1000 -101
11-74
dBc/Hz dB/V mV/dB
dBc/Hz
Freq=433MHz Freq=915MHz Freq=433MHz Freq=915MHz RLOAD =51k
Parameter
Specification Min. Typ. Max.
Unit
Condition
T=25 =3.6V, Freq=915MHz
Freq=915MHz, 10kHz Offset, 5kHz Loop Bandwidth Freq=915MHz, 100kHz Offset, 5kHz loop Bandwidth
Instantaneous frequency deviation inversely proportional with modulation voltage ENABL="1". ENABL="0" Mode
Compliant Part 15.249 I-ETS
Freq=433MHz Freq=915MHz BW=180kHz, Freq=915MHz, S/N=8dB
021008
RF2905
Parameter
Voltage Gain Noise Figure Input Input P1dB Antenna Port Impedance Antenna Port VSWR Output Impedance 1.5:1 Open Collector Open Collector 433MHz 915MHz 433MHz 915MHz 433MHz 915MHz 433MHz 915MHz ENABL="1". ENABL="0" Mode 433MHz 915MHz Single-ended configuration 433MHz 915MHz 433MHz 915MHz 433MHz 915MHz 433MHz 915MHz Balanced
Specification Min. Typ. Max.
Unit
Condition
Mixer
Conversion Voltage Gain Noise Figure (SSB) Input Input P1dB Maximum Output Voltage
First Section
Frequency Range Voltage Gain Noise Figure Input Impedance Output Impedance 10.7 10.7
-0.3
mVPP
Second Section
Frequency Range Voltage Gain Input Impedance Output Impedance Demod Input Impedance Output Impedance Data Output Impedance Output Bandwidth
Data Output Bandwidth Data Output Level
Output Level Output Level
021008
IF=10.7MHz OUT-
IF=10.7MHz,
Bandwidth, Dependent upon bandwidth Discriminator. Bandwidth, ZLOAD=1M 3pF; Dependent upon bandwidth Discriminator. ZLOAD=1M 3pF; Output voltage proportional with instantaneous frequency deviation. ZLOAD>10k ZLOAD>10k
11-75
RF2905
Parameter
Power Down Control
Logical Controls "ON" Logical Controls "OFF" Control Input Impedance Turn Time Turn Time Time Voltage supplied input Voltage supplied input Reference Crystal=7.075MHz Dependent upon reference crystal. Higher frequencies reduce turn on/off times Specifications Operating limits Mode, ADJ=3.6V Mode, ADJ=0V Mode Power Down Mode which sets: ENABL, ENABL, ENABL, ADJ, SEL, MUTE=0V Only Mode
Specification Min. Typ. Max.
Unit
Condition
Power Supply
Voltage Current Consumption
34.5 13.5
11-76
021008
RF2905
Function ENABL Description
Enable receiver circuits. ENABL>2.0V powers receiver functions. ENABL<1.0V turns receiver functions except functions mixer.
Interface Schematic
ENABL
ENABL
Enables transmitter circuits. ENABL>2.0V powers transmitter functions. ENABL<1.0V turns transmitter functions except functions.
ENABL
output transmitter electronics. output impedance impedance when transmitter enabled. high impedance when transmitter disabled.
GND2
Ground connection 40dB limiting amplifier functions. Keep traces physically short connect immediately ground plane best performance. input receiver electronics. input impedance impedance when transmitter enabled. high impedance when receiver disabled.
GND1 GND3
Ground connection receiver functions. best performance, keep traces physically short connect immediately ground plane. Output receiver noise amplifier. This open collector output requires external pull coil provide bias tune output. Same
input Mixer. matching network between used connect output mixer input applications where image filter needed desired.
GND5
OUT+
GND5
OUT-
GND5 ground connection shared input stage transmit power amplifier receiver mixer. Complementary (with respect output from mixer. OUT+ Interfaces directly 10.7MHz ceramic filters shown application schematic. pull-up inductor series matching capacitor should used present termination impedance ceramic filter. Alternately, tank used tailor freGND5 quency bandwidth meet needs given application. output from mixer. balanced mixer output, pull-up induc- tors from capacitor between pins should used. total pull-up inductance should used resonate capacitor between pins blocking capacitors 10nF then used connect balanced output (pin (pin 14).
GND5
021008
11-77
RF2905
Function Description
Balanced input 40dB limiting amplifier strip. 10nF blocking capacitor required this input.
Interface Schematic
BP60
INIF1 BPIF1
output from 40dB limiting amplifier. output presents nominal output resistance interfaces directly 10.7MHz ceramic filters.
Functionally same except inverting node amplifier input. single-ended applications, this input should bypassed directly ground through 10nF capacitor. feedback node 40dB limiting amplifier strip. 10nF bypass capacitor from this ground required. Same
Balanced input 60dB limiting amplifier strip. 10nF blocking capacitor required this input. input presents nominal input resistance interfaces directly 10.7MHz ceramic filters.
BP60
GND6 VREF BPMUTE
Ground connection 60dB limiting amplifier. Keep traces physically short connect immediately ground plane best performance. voltage reference limiting amplifiers. 10nF capacitor from this ground required. feedback node 60dB limiting amplifier strip. 10nF bypass capacitor from this ground required. Same This used mute data output (DATA OUT). MUTE>2.0V turns DATA signal MUTE<1.0V turns DATA signal off. MUTE signal should logic Sleep Mode.
MUTE
RSSI
voltage proportional received signal strength output from this pin. output voltage range 0.5V 2.5V, into load, increases with increasing signal strength.
RSSI
Linear output from demodulator. This used analog applications when signal fidelity important. This output inverted side injection normal high side injection.
11-78
021008
RF2905
Function DATA Description
Demodulated data output from demodulator. Output levels this TTL/CMOS compatible. magnitude load impedance intended greater. When using RF2905 transmitter receiver back back data inversion will occur, when side injected. high side injection will inversion data. This input demodulator. This coupled. Therefore, blocking capacitor required this avoid shorting demodulator input with tank. ceramic discriminator blocked tank resonant should connected this pin.
Interface Schematic
DATA
DEMOD
DEMOD
Balanced output from 60dB limiting amplifier strip. This intended connected through (suggested) capacitor discriminator circuit.
RESNTR+
VCC6
RESNTR+
This used supply bias second amplifier, Demodulator Data Slicer. bypass capacitor should connected directly this returned ground. 10nF capacitor recommended 10.7MHz applications. This port used supply voltage well tune center frequency VCO. Equal value inductors should connected this although small imbalance used tune proper frequency range.
RESNTR-
GND4
CTRL
This used supply bias VCO, prescaler, PLL. bypass capacitor should connected directly this returned ground. 22pF capacitor recommended 915MHz applications. 68pF capacitor recommended 433MHz applications. GND4 ground shared chip VCO, prescaler, electronics. analog digital modulation imparted through this pin. varies accordance voltage level presented this pin. deviation desired level, voltage divider referenced recommended. This deviation also dependent upon overall capacitance external resonant circuit. This used select desired prescaler divisor. logic high (DIVCTRL>2.0V) selects 64/65 divisor. logic (DIVCTRL<1.0V) selects 128/129 divisor.
CTRL
This used select prescaler modulus. logic high (MOD CTRL>2.0V) selects prescaler divisor. logic (MOD CTRL<1.0V) selects prescaler divisor. design timing constraints, prescaler divide modes limited frequency range accurate operation. These modes recommended from 400MHz 460MHz.
RESNTRVCC2
RESNTR+ description.
021008
11-79
RF2905
Function Description
logic high (OSC SEL>2.0V) applied this powers reference oscillator powers down reference oscillator logic (OSC SEL<1.0V) applied this powers reference oscillator powers down reference oscillator This connected directly reference oscillator transistor base. intended reference oscillator configuration modified Colpitts.
Interface Schematic
LOOP
ENABL
This connected directly emitter reference oscillator transistors. This connected directly reference oscillator transistor base. intended reference oscillator configuration modified Colpitts. Output charge pump, input control. netVCC work from this ground used establish bandwidth.
LOOP
VREF LOCK
Bypass prescaler reference voltage. 33nF capacitor ground needed suppress reference spurs device. This value different different arrangements. This provides analog output indicating lock status PLL. amplitude this signal typically 200mVPP around level VCC-0.1V.
LOCK
VCC1
VCC3
PRESCL
This used supply bias LNA, Mixer, first Amp, Bandgap reference. bypass capacitor should connected directly this returned ground. 22pF capacitor recommended 915MHz applications. 68pF capacitor recommended 433MHz applications. Dual-modulus/Dual-divide prescaler output. output interfaced external additional flexibility frequency programming.
PRESCL
This used supply bias collector current transmitter bypass capacitor should connected directly this returned ground. 22pF capacitor recommended 915MHz applications. 68pF capacitor recommended 433MHz applications. This used vary transmitter output power. output level adjustment range greater than 12dB provided through analog voltage control this pin. current transmitter power also reduced with output power. This MUST when transmitter disabled.
ENABL
This used power down PLL. logic high (PLLENABL>2.0V) powers electronics. logic (PLLENABL<1.0V) powers down VCO.
11-8
021008
RF2905
RF2905 Theory Operation Application Information
RF2905 part family low-power transceiver IC's that developed wireless data communication devices operating European 433/868MHz bands 915MHz band.This been implemented 15GHz silicon bipolar process technology that allows low-power transceiver operation variety commercial wireless products. basic form, RF2905 implement two-way half duplex transceiver with addition some crystals, filters, passive components. There reference crystals that allow transmit carrier receiver independently generated with common VCO. receiver section optimized interface with cost 10.7MHz ceramic filters bandwidth 25MHz still used (with lower gain) higher frequency with other type filters. output input available separate pins designed connected together through blocking capacitor. Transmit mode, will have impedance will high impedance. Receive mode, will have interface will have high impedance. This eliminates need TX/RX switch allows single filter used transmit receive modes. Separate access allow RF2905 interface with external components such higher power PA's, lower LNA's, upconverters, downconverters variety implementations. sion. Since balanced data slicer does have charge large capacitor, RF2905 exhibits very fast response time. best operation on-chip data slicer, deviation needs exceed carrier frequency error anticipated between receiver transmitter with margin. data slicer itself transconductance DATA capable driving rail rail output only into very high impedance small capacitance. amount capacitance will determine bandwidth DATA OUT. load, bandwidth excess 500kHz. rail rail output data slicer also limited frequency deviation bandwidth filters. With 180kHz bandwidth filters eval boards, rail rail output limited less than 140kHz. Choosing right bandwidth deviation data rate (mod index) important evaluating applicability RF2905 given data rate. While this type data slicer best wideband deviation, also work narrowband care taken minimize frequency differences. loading down DATA pin, output will limited small data signal carrier. With this signal, external data slicer used achieve higher data rates improve performance narrow deviations. Alternatively, loop added correct frequency errors with external components. modulation, internal varactor used directly modulate with baseband data. primary consideration when directly modulating data rate verses loop bandwidth. will track modulation extent loop bandwidth which distorts modulating data. Therefore, lower frequency components modulating data should times loop bandwidth minimize distortion. lower frequency components generated long strings data stream. limiting number consecutive, same bits, lower frequency component set. addition, data stream should balanced minimize distortion. Using coding pattern such Manchester highly recommended optimize system performance. loop bandwidth important several other system parameters. example, switching from transmit receive requires retune another frequency. switching speed proportional 11-81
FM/FSK SYSTEMS drives internal varactor modulating VCO. This driven with voltage level needed generate desired deviation. This voltage carried bias select desired slope (deviation/volt) systems. resistor divider network referenced ground divide down logic level signals appropriate level desired deviation systems. receiver demod, outputs available, analog output digital output. output buffered signal coming quadrature demodulator. digital output generated data slicer that coupled differentially demodulator. on-chip 1.6MHz filter provided demodulator output filter undesired 2xIF product. This balanced data slicer speed advantage over conventional adaptive data slicer where large capacitor used provide reference deciRev 021008
RF2905
loop bandwidth, higher loop bandwidth, faster switching times. Phase noise another factor. Phase noise outside loop bandwidth noise itself rather than crystal reference. design trade-off must made here selecting loop bandwidth with acceptable phase noise switching characteristics minimal distortion modulation data. AM/ASK SYSTEMS transmitter RF2905 output power level adjustment (LVL ADJ) that used provide approximately 18dB power control amplitude modulation. RSSI output receiver section used recover modulation. RSSI output from current source needs have resistor convert voltage. resistive load will produce RSSI voltage 0.7V 2.5V, typically. parallel capacitor suggested limit bandwidth filter noise. applications, 18dB range does produce enough voltage swing RSSI reliable communication. OnOff keying (OOK) suggested provide reliable communications. achieve this, both ENABL need controlled together (please note that cannot left high when ENABL low). This will provide on/off ratio >50dB. unfortunate consequence modulating this pulling power amp. This results spurious output outside desired transmit band momentarily loses lock reacquires. This avoided pulse shaping data slow change load pace that track with given loop bandwidth. loop bandwidth also increased allow track faster changes load pulling. dielectric filter, then only blocking capacitor would needed separate OUT. These signals care should taken route these signals keeping them physically short. Because 50/high impedance nature these signals, they connected together into signal device such filter. external used, desired, external RX/TX switch required. very sensitive block this system. signals feeding back into either radiated coupled traces cause become unlocked. trace(s) anode tuning varactor should also kept short. layout resonators varactor very important. capacitor varactor should closest RF2905 pins trace length should short possible. inductors placed further away trace inductance compensated reducing value inductors. Printed inductors also used with careful design. best results, physical layout should symmetrical possible. Figure recommended layout pattern components. When using loop bandwidths lower than 5kHz shown eval board, better filtering resonators (and lower noise well) will help reduce phase noise VCO. series resistor larger capacitor used.
Loop Voltage
Scale Representative Size
ASK/OOK receiver demodulator, external data slicer required. RSSI output used provide both filtered data very pass filtered (relative data rate) reference data slicer. Because very pass filter slow time constant, longer preamble required allow reference stable state. Here, case transmitter, data pattern also affects reference reliability received data. Again, coding scheme such Manchester such should used improve data integrity. APPLICATION LAYOUT CONSIDERATIONS Both have bias them. Therefore, blocking caps required. filter blocking characteristics like ceramic 11-82
Figure Recommended Layout interface between LNA/mixer, coupling capacitor should close RF2905 pins possible with bias inductor being further away. Once again, value inductor changed compensate trace inductance. output impedance order several which makes matching very hard. image filtering desired, high impedance filter recommended. 021008
RF2905
quad tank discriminator implemented with ceramic discriminators available from couple sources. This design works well wideband applications where temperature range limited. temperature coefficient ceramic discriminator order 50ppm degree automatic frequency control loop implemented using level feedback external varactor reference crystal. alternative ceramic discriminator tank. Figure shows schematic implementation tank. lock faster, need minimize this end, divide rather than correspondingly lower frequency reference crystal achieve desired output frequency. Design loop filter minimum phase margin possible without causing loop instability problems; this allows kept minimum. Design loop filter highest loop frequency possible without distorting frequency modulation components; this also allows kept minimum. CRYSTAL SELECTION Several issues arise selection crystals. Timing specifications such start-up switching related crystal specifications, well external circuitry. tolerance crystals also issue optimum radio performance. general, tighter tolerance crystals lead better performance more critical higher data rates. Frequency offsets between crystal, crystal discriminator generate duty cycle variations receive demodulator. crystals used RF2905 evaluation boards specified parallel resonant, 30pF crystal with maximum initial tolerance +20ppm temperature stability +30ppm -10°C 70°C. transistor oscillator will work with variety different crystals final crystal specifications should evaluated each application. Faster start-up switching times achievable specifying crystals with motion inductance motional resistance. Additionally, feedback caps oscillator changed increase voltage crystal. Generally, crystals leaded HC-49U packages will provide better start-up times than smaller surface-mount types used evaluation board.
3.3µH 4-22 opt.
Figure Type Discriminator Circuit
PREDICTING MINIMIZING LOCK TIME RF2905 implements conventional chip, with followed prescaler dividing output frequency down compared with signal from reference oscillator. output phase discriminator sequence pulse width modulated current pulses required direction steer VCO's control voltage maintain phase lock, with loop filter integrating current pulses. lock time this combination loop transient response time slew rate phase discriminator output current combined with magnitude loop filter capacitance. good approximation total lock time RF29.5 Lock time=D/fc+35000*C*dV
Where factor account loop damping. loops with phase margin (30° 40°), whereas loops with better phase margin (50° 60°), D=1. loop frequency. shunt capacitors loop filter. required step voltage change produce desired frequency change during transient. 021008 11-83
DEMOD bias must blocked. This done either ground side tank (this must also done parallel resistor used with ceramic discriminator). decision whether used ceramic discriminator should based upon frequency deviation system, discriminator needed, frequency temperature tolerances. Tuning tank required overcome component tolerances tank.
RF2905
PRESCL ENABL LOCK LOOP CTRL CTRL GND4 VCC2 RESNTR30 RESNTR+ VCC6 DEMOD DATA GND6 VREF BP23 MUTE RSSI
ENABL ENABL GND2 GND1 OUT7 GND3 GND510 OUT+ OUT12
VCC3
11-84
VREF
VCC1
021008
RF2905
Application Schematic 915MHz
ENABL ENABL Filter Gain Control LOCK DET+
DATA ENABL
Select
Disc.
Lock Detector Phase Detector Charge Pump
PRESCL CTRL CTRL
Prescaler 128/129 64/65
Linear RSSI
8.2µH
DATA RSSI
Filter
Filter
MUTE
SMV1233-011
LOOP BANDWIDTH
021008
11-85
RF2905
Application Schematic 868MHz
ENABL ENABL Filter Gain Control LOCK DET+
DATA ENABL
Select
Disc.
Lock Detector Phase Detector Charge Pump
PRESCL CTRL CTRL
Prescaler 128/129 64/65
Linear RSSI
Filter
DATA RSSI
Filter
MUTE
11-86
SMV1233-011
LOOP BANDWIDTH
021008
RF2905
Application Schematic 433MHz
ENABL ENABL Filter Gain Control LOCK DET+
DATA ENABL
Select
Disc.
PRESCL CTRL CTRL
Lock Detector Phase Detector Charge Pump
Prescaler 128/129 64/65
Linear RSSI
Filter
DATA RSSI
Filter
MUTE
SMV1233-011
LOOP BANDWIDTH
021008
11-87
RF2905
Evaluation Board Schematic
(Download Bill Materials from www.rfmd.com.)
P1-1 P1-3 ENABL P2-1 ENABL P2-3 P3-3 P3-1 CTRL SLICER LOCK
P4-2 P4-3 P4-4 P4-5
ENABL CTRL MUTE P5-1
LMC7211
LOCK
2N3904 Circuit populated. Optional Lock Detector Data Slicer
3-10
100pF
ENABL ENABL ENABL C35* C36* C39* Prescaler 128/129 64/65 Gain Control Lock Detector
pF100
3-10 47nF C18* DISC SMV1233-011 CDF107B-A0.001 MUTE L4,L5(nH) (MHz) 6.78 13.577344 7.15909 (MHz) 6.612 13.410156 7.07549
Select
CTRL CTRL
Linear RSSI
Phase Detector Charge Pump
DATAOUT
SFECV10.7 MS3S-A-TC BW=180kHz MIXOUT
SLICER
SFECV10.7 MS3S-A-TC BW=180kHz
Test Only Populated
2905400-, 401-, 402-
Board (433MHz) (868MHz) (915MHz)
(pF)
(nH)
(nH) Jumper Jumper
(pF)
(nH)
(pF)
(pF)
11-88
021008
RF2905
Evaluation Board Layout Board Size 3.05" 3.05"
Board Thickness 0.031", Board Material FR-4, Multi-Layer (Same board layout used versions.)
021008
11-89
RF2905
11-9
021008
RF2905
021008
11-91
RF2905
1.0.6
RXonTXoff
RXoffTXoff
1.2GHz
0.3GHz
-0.2
-0.8
TXonRXoff
1.2GHz
0.3GHz
10.0
-0.8
0.3GHz
11-92
-0.2
0.3GHz
0.3GHz
-10.
-10.
5.10.
021008
RF2905
RSSI Freq. MHz, 3.6V, RLoad
600.
Modulation Deviation Freq. MHz,
500.0
Deviation From Carrier (kHz)
RSSI Output (Volts)
400.
300.
200.
100.
-120.0 -100.0 -80.0 -60.0 -40.
Received Power (dBm)
(Volts)
600.
Deviation From Carrier (kHz)
400.
Deviation From Carrier (kHz)
300.
200.
100.
500.
1200.0 1000.0 800.0 600.0 400.0 200.0
Modulation Deviation Freq. MHz,
Modulation Deviation Freq. MHz,
(Volts)
(Volts)
021008
11-93
RF2905
12.0
Mode Current versus Freq
10.00
Power Output versus MHz,
Power(dBm)
40.0
(mA) 11.0
Icc(mA) 8.00
35.0
10.0
30.0
(dBm)
6.00 5.00 4.00 20.00 3.00 2.00 25.0
(mA)
7.00 1.00 6.00 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 0.00
2.75 3.00 3.25 3.50 3.75 4.00 4.25
15.0
10.00 4.50 4.75
VCC,
Power Output versus Level Adjust MHz,
(dB) (mA)
Power Output versus Level Adjust MHz,
(dB) (mA)
(dBm)
(dBm)
(mA)
-10.
-10.
-15.0
-15.0
Power Output versus Level Adjust MHz,
(dB)
(mA)
(dBM)
-10.
-15.0
11-94
(mA)
021008
(mA)
(mA)

RF2905

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