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DATA BULLETIN
CMX017 UHF FM/FSK Transmitter
ADVANCE INFORMATION
Features
* * * * * * Direct FM/FSK UHF Modulator Adjustable Modulator Output Power Integrated Power Amplifier with Output Power up to +20dBm (100mW) Low Power 2.7V Operation Powersave and Zero-Power (<10A) Modes 28-Pin SSOP Package
GAIN
Applications
* * * * * * *
MODOUT
General Radio Link 860-965MHz General 915MHz ISM Band (USA) Spread Spectrum Wireless Systems Fixed Frequency Transmissions Analog/Digital Cordless Phones Handheld Data Terminals SO-HO Wireless Data Links
PAIN IPAOUT
FM/FSK MODULATOR
POWER AMPLIFIER DRIVER POWER AMPLIFIER PAOUT
MODIN
TANK
BUFFERED OSCILLATOR OUTPUT
BANDGAP & BIAS CONTROL
OSCOUT
ENLMOD
ENLPA
The CMX017 is a single chip UHF FM/FSK transmitter that combines both the RF VCO Modulator and RF Power Amplifier. It is suitable for both audio FM and digital FSK transmissions. A buffered oscillator output provides the RF signal drive to an external synthesizer or fixed frequency phaselocked loop for channel frequency selection. Modulator output power is adjustable over a 20dB range and the integrated power amplifier delivers up to +20dBm. The device also includes a powersave mode: "Transmit Standby" and a zero-power mode: "Sleep". These allow independent power down control of both the modulator and power amplifier, thereby maximizing battery life. The device can be used in conjunction with the CMX018, a double-conversion super-heterodyne receiver, to implement a complete UHF radio link. The CMX017 operates from a 2.7V to 3.3V power supply and is available in the following package style: 28-pin SSOP (CMX017D6).
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
2
CMX017 Advance Information
CONTENTS
Section Page
1 Block Diagram................................................................................................................ 3 2 Signal List....................................................................................................................... 4 3 External Components.................................................................................................... 5 4 General Description....................................................................................................... 6
4.1 4.2 4.3 FM/FSK Modulator + PA Driver ........................................................................................... 6 Power Amplifier (PA) ........................................................................................................... 6 Power-Down Modes ............................................................................................................ 6
5 Application Notes .......................................................................................................... 6
5.1 5.2 Generation of the Modulated RF Signal .............................................................................. 6 Power-Down Modes ............................................................................................................ 7
6 Performance Specification.......................................................................................... 10
6.1 Electrical Performance ...................................................................................................... 10
6.1.1 6.1.2 6.1.3 6.1.4 Absolute Maximum Ratings.................................................................................................. 10 Operating Limits ................................................................................................................... 10 Operating Characteristics..................................................................................................... 10 Packaging............................................................................................................................. 12
MX-COM, Inc reserves the right to change specifications at any time and without notice.
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
3
CMX017 Advance Information
1 Block Diagram
VCC3
1
28
PAIN
GAIN
2
PA DRIVER
27
GND
GND
3
PA STAGE 1
26
MODOUT
GND
4
25
GND
GND
5
BUFFERED OSCILLATOR OUTPUT
24
VCC2
IPAOUT
6
23
OSCOUT
GND
7
PA STAGE 2
22
VCC1
GND
8
FM/FSK MODULATOR
21
GND
PAOUT
9
20
TANK
GND
10
19
GND
GND
11
18
MODIN
SUBSTRATE
VCC4
12
17
GND
ENLPA
13
PACKAGE GROUND PACKAGE GROUND
16
ENLMOD
GND
14
15
GND
Figure 1: Internal Block Diagram
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
4
CMX017 Advance Information
2 Signal List
Pin No. D6 Package 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Name VCC3 GAIN GND GND GND IPAOUT GND GND PAOUT GND GND VCC4 ENLPA GND GND ENLMOD GND MODIN GND TANK GND VCC1 OSCOUT VCC2 GND MODOUT GND PAIN Signal Type power input ground ground ground output ground ground output ground ground power CMOS input ground ground CMOS input ground input ground input ground power output power ground output ground input Description Power amplifier (first stage) power supply - nominally 3.0V Modulator output (pin 26) - Power control Ground-plane connection to the power amplifier Ground-plane connection to the power amplifier Ground-plane connection to the power amplifier Output (open-collector) from the first stage of the power amplifier Ground-plane connection to the power amplifier Ground-plane connection to the power amplifier Output (open-collector) from the second stage of the power amplifier Ground-plane connection to the power amplifier Ground-plane connection to the power amplifier Power amplifier (second stage) power supply - nominally 3.0V Power Amplifier powersave logic control. A logic "0" powers down the Power Amplifier and Driver stages Ground-plane connection Ground-plane connection Modulator zero-power logic control. A logic "0" powers down the Modulator and Buffered Oscillator stages Ground-plane connection Baseband modulation input signal Ground-plane connection to the VCO VCO Tank circuit/Resonator connection Ground-plane connection to the modulator and VCO buffer Modulator power supply - nominally 3.0V Buffered Oscillator (open-collector) output Power Amplifier Driver power supply - nominally 3.0V Ground-plane connection for the Power Amplifier Driver Modulator output Ground-plane connection for the Power Amplifier Driver Power Amplifier input Table 1: Signal List
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
5
CMX017 Advance Information
3 External Components
POWER CONTROL 3V C1 CDEC C6 GND GND C7 L1 C5 Tx SIGNAL L2 PAOUT GND C8 GND VCC4 ENLPA C9 GND GND IPAOUT GND GND VCC3 GAIN L3 RF to PLL C2 MODOUT C10 GND VCC2 OSCOUT VCC1 GND TANK GND MODIN GND ENLMOD GND R2 R3 SMD POT
R1R1
28 1 27 2 26 3 25 4 24 5 23 6 22 7 CMX017D6 21 8 20 9 19 10 18 11 17 12 16 13 15 14
PAIN GND
3V C11
CDEC
L4
RESONATOR
C12
R1 D1 C3 C4 R4 BASE-BAND From PLL
ENABLE POWER AMPLIFIER
ENABLE MODULATOR
CDEC
1m F
10nF
100pF
Figure 2: Example of CMX017 with External Components C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 5.6pF 33pF 4.3pF TBD 100pF 100pF 100pF 100pF 100pF 100pF C12 D1 ~ L1 L2 L3 L4 R1 R2 R3 100pF Varactor Resonator 1.5nH 22nH 6.8nH 22nH 10k 10k TBD Value is application dependent Varactor diode, type SMV1233-011 Co-Axial Resonator, type RG402, length = 11mm, shorted end
C11 100pF R4 TBD SMD potentiometer - value is application dependent Note: Components are surface mount, type SMD0603, unless otherwise indicated. Figure 3: Example of CMX017 with External Components for 915MHz Operation
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
6
CMX017 Advance Information
4 General Description
The CMX017 is a single chip UHF FM/FSK transmitter that combines both the RF VCO Modulator and RF Power Amplifier. It is suitable for both audio FM and digital FSK transmissions. A buffered oscillator output provides the RF signal drive to an external synthesizer or fixed frequency phaselocked loop for channel frequency selection. Modulator output power is adjustable over a 20dB range and the integrated power amplifier delivers up to +20dBm. The device also includes a powersave mode: "Transmit Standby" and a zero-power mode: "Sleep". These allow independent power down control of both the modulator and power amplifier, thereby maximizing battery life. The device can be used in conjunction with the CMX018 a double-conversion super-heterodyne receiver, to implement a complete UHF radio link.
4.1
FM/FSK Modulator + PA Driver
The modulator circuit uses an integrated oscillator whose frequency can be directly modulated by the DCcoupled input base-band signal, at the MODIN pin, to generate a frequency modulated (FM or FSK) RF signal. The oscillator requires an external varactor and resonator circuit, connected at the TANK pin, to tune to the required RF channel. A buffered oscillator signal is provided from an open-collector output, at the OSCOUT pin, to drive an external frequency synthesizer for the channel selection. The output power, at the MODOUT pin, is variable over a 20dB range. The output power is maximum when the GAIN pin is connected to VCC and is reduced by typically 20dB when this pin is connected to 0V. The output impedance at the MODOUT pin is typically 50.
4.2
Power Amplifier (PA)
The power amplifier has two internal stages, each biased for class-B operation, and is designed to have a fixed overall power gain. The input and output impedances can be terminated with 50. A typical power gain improvement of 2dB is achieved using simple external matching networks.
4.3
Powersave and Zero-Power Modes
The Modulator and Buffered Oscillator stages are powered down independently of the PA Driver + Power Amplifier stages by means of the ENLMOD and ENLPA logic inputs: A logic `0' at ENLMOD powers down the Modulator and Buffered Oscillator stages. A logic `0' at ENLPA powers down the PA Driver and Power Amplifier stages. Refer to the block diagram in Figure 1 and to Section 5.
5 Application Notes
5.1 Generation of the Modulated RF Signal
The modulator on the CMX017 relies on the direct modulation of the RF Voltage Controlled Oscillator (VCO), which is stabilized to the channel center frequency by an external Frequency Synthesizer or Phase Locked Loop (PLL). The user has control over the external PLL filter and VCO tank components and choice of these components will have an impact upon the following PLL parameters:Closed loop bandwidth, settling time and transient response Modulation linearity VCO phase noise Three modulation requirements may be achieved as follows: 5.1.1 The minimum modulation signal frequency is above the PLL Closed Loop Bandwidth In applications where the transmit channel frequency is fixed or occasionally changed, a narrow PLL bandwidth can be chosen such that the minimum modulation frequency is in excess of the PLL bandwidth. With the PLL active whilst the base-band signal is applied to the modulator there will be negligible distortion of the modulated RF output signal. A benefit of this technique is that an output phase noise improvement is achieved, compared to the free running VCO phase noise characteristic. 5.1.2 The minimum modulation signal frequency is within the PLL Closed Loop Bandwidth In Frequency Hopped Spread Spectrum applications the frequency synthesizer must be agile. Consequently the PLL bandwidth should be designed to achieve the required hop-rate and, in most systems this bandwidth will exceed the minimum modulation frequency. With the PLL active during modulation, the loop will
(c)1999 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
7
CMX017 Advance Information
compensate for the signal frequency components within the loop bandwidth, introducing a frequency dependant distortion of the modulated RF output signal. To avoid the modulation distortion the carrier frequency is tuned by the external synthesizer chip, with no modulating signal applied. The synthesizer control is then disabled, by setting the charge-pump output of the synthesizer to tri-state. The DC coupled base-band signal, applied to the MODIN pin, then modulates the free running VCO to generate the FM or FSK output signal. 5.1.3 A flat modulator response is required down to DC, whilst benefiting from the phase noise improvements due to the PLL (Two-Point Modulation).
Unlike in the above two cases, where a fixed reference frequency is used in the PLL, the Two-Point Modulation technique requires modulation inputs to both the PLL reference oscillator and to the RF VCO circuits. The modulation signal should be applied to both modulation inputs with suitable AC/DC levels and with the correct phase to achieve cancellation of the loop's feedback. This prevents the radio's PLL circuitry from counteracting the modulation process and so provides a clean flat modulation response down to DC.
5.2
Powersave and Zero-Power Modes
It is possible to power down each section of the transmitter independently. This feature may be useful when the CMX017 is configured, with the CMX018, as a radio transceiver. It allows the transmitter to be powered on and off, thereby saving power, during the sleep and standby periods. In SLEEP mode (ENLMOD='0' and ENLPA='0') all sections of the device are powered down and the current consumption is reduced to less than 10A. This is the zero-power mode. In TRANSMIT-STANDBY mode (ENLMOD='1' and ENLPA='0') only the PA Driver and Power Amplifier stages are powered down, while the Modulator and Buffered Oscillator remain active. This powersave mode allows the external frequency synthesizer to stabilize the channel center frequency prior to the RF transmission. In TRANSMIT mode (ENLMOD='1' and ENLPA='1') both the Modulator and the Power Amplifier sections of the device are fully operational. Note: The device can be used as a stand alone "UHF Power Amplifier" by forcing (ENLMOD='0' and ENLPA='1'). The efficiency is maximized by connecting the VCC2 pin to 0V. (The VCC1 pin must remain connected to 3.0V.)
5.3
Lower Output Power Applications
For very short range applications the antenna drive can be taken from the modulator output, MODOUT, at pin 26. The Power Amplifier is powered down by connecting VCC3 and VCC4 (pins 1 and 12) to 0V. This allows the supply current to be minimized and the Modulator output to be enabled or disabled using the ENLPA input at pin 13.
5.4
Example Schematic and Layout
The following schematic (Figure 4) and printed circuit layout (Figure 5 and Figure 6) present a typical application interface for the CMX017. To aid legibility, the schematic and layout are available electronically from the MX-COM website http://www.mxcom.com. Alternative components and component values are shown on the schematic. These should be selected according to the intended application. The schematic uses the following ICs: U2 U4 IC Works Analog Devices WB1315X AD8532-SO8
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
C1
N/C
L2 6.8nH
5.6pF C4 C3 L3 100pF
1 VCC3 PAIN
1 GND
C10
6 IPAOUT OSCOUT GND7 VCC1 GND1 21 GND8 23
100pF
7
1.5nH CMX017D6 100pF C13 4.7pF 10K R14 100pF C26
TANK OSCGND MODIN GND ENLMOD GND 15 16 17 18 19 20 22
100pF C11 C14 6.8pF D1 C8 3pF R1 10k C9 R2 100R 10nF
C12
9 PAOUT GND9 GND10 VCC4 ENLPA GND
L5 22nH
10 11 12
8
C65
13
N/C J2 33pF 100pF C19 L6 20nH C16 12pF C15
14
3V
C18 100pF L7 R9 N/C 0R C24
2
L4
GND6 VCC2
5 24
IN
TXRESNR
(c)1999 MX-COM, Inc.
C5 100uF
28 27 26
C2 33pF 100nH C6 100nF C7
L1
100pF
3V
UHF FM/FSK Transmitter
3V
100nH
2 GAIN GND3 MODOUT GND4 GND5 GND2 3
100pF
4
U1
25
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
5V
15uH R13 N/C 47k 1nF C27
8
5V
C31 L8 100pF 15uH C41 C39 100pF C42
2 4 6 DO1 GND FIN1 FIN1B 7 8 GND OSC_IN 9 10 GND FO_LD 8 1 1 3
U4
8
2.2uF AD8532-SO8 C22
3 2 + 6 1
C32
C33
C34
100nF 100pF 2.2uF
100pF
4
5
( 7 - N/C)
100pF J1 C44 C145 100pF
3 4 5 VCC1 VP1 2
R17 N/C
VCC2 20 VP2 DO2 GND 19
R18 47k C35 R19 0R
100pF R100
5 7
100pF
U2
C40 100pF 100 C45
9 10 12 11
18 17
470nF WB1315X
FIN2 FIN2B GND LE DATA CLOCK 16 15 14 13 12 11
C36 C37 100nF 100pF
1k
Figure 4: Application Schematic
100pF C46 C38 100pF 1nF
6
C48 100uF
13 14 16 18 20
3V
L9
17 19 15
C43
1uF
15uH
5V
TFMCON20M C56 100uF 100nF 10nF C57 C58
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SYNT_CLK SYNT_DATA SYNT_STB
NF NF NF
R21
R22 100k
R23 100k 100k
CMX017 Advance Information
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Doc. # 20480193.003
UHF FM/FSK Transmitter
9
CMX017 Advance Information
Figure 5: Application Layout - Top Copper
Figure 6: Application Layout - Bottom Copper (not reversed) Available from http://www.mxcom.com.
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
10
CMX017 Advance Information
6 Performance Specification
6.1
6.1.1
Electrical Performance
Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device. Pin Supply (VCC) Input Voltage Power Amplifier Input Power D6 Package Total Allowable Power Dissipation at TAMB = 25C Derating above 25C Storage Temperature -55 Table 2: Absolute Maximum Ratings 6.1.2 Operating Limits 1100 11 +125 mW mW/C above 25C C 1, 12, 22, 24 2, 13, 16, 18, 20 28 Min. -0.3 -0.3 Max. 7.0 VCC + 0.3 +7 Units V V dBm
Correct operation of the device outside these limits is not implied. Notes Supply (VCC) Operating Frequency Range Operating Temperature Min. 2.7 860 -10 Max. 3.3 965 +60 Units V MHz C
Table 3: Operating Limits 6.1.3 Operating Characteristics
For the following conditions unless otherwise specified: VCC = 2.7V to 3.3V, TAMB = -10C to +60C, RF = 915MHz, 50 source and load impedance. Pin DC Parameters Device Fully Enabled (ENLPA=HI and ENLMOD=HI) ICC [Output Power = +20dBm at PAOUT (pin 9)] ICC [Output Power = +10dBm at PAOUT (pin 9)] ICC [Output Power = +0dBm at PAOUT (pin 9)] Device in Power-Down Modes ICC in STANDBY mode (ENLPA=LO and ENLMOD=HI) ICC in SLEEP Mode (ENLPA=LO and ENLMOD=LO) 1 1 1 1 1 130 60 40 24 TBD 10 mA mA mA mA A Note Min. Typ. Max. Units
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
11
CMX017 Advance Information
Pin AC Parameters Modulator, VCO Buffer and PA Driver Output Power [GAIN (pin 2) at VCC] Output Power [GAIN (pin 2) at 1.5V] Output Power [GAIN (pin 2) at 1.0V] Buffered VCO Output at OSCOUT pin Oscillator Second Harmonic Output Oscillator Third Harmonic Output Modulation Sensitivity Maximum Deviation Input Data Rate Output VSWR (at maximum output power) Power Amplifier Power Gain Power Gain (with external matching at VCC = 3.3V) Maximum Power Gain Variation Maximum Power Gain Variation (with matching) Input 1dB Compression Point Input 1dB Compression Point (with matching) Reverse Isolation Output VSWR (at maximum output power) Notes: 1. Total current from the external 3V power supply. 2. Power measured into a 50 load. 3. With external matching. 4. Stepped modulation voltage input from 1.0V to 2.0V. 5. Stepped modulation voltage from 0V to 3.0V. 6. Input Power = -15dBm to -1dBm. 26 26 26 19 26 26 18 26 18 26 28, 9 28, 9 28, 9 28,9 9 9 9, 28 9
Note
Min.
Typ.
Max.
Units
2 3 3 4 5 6 6 -
-4.0 -9.0 -14 -10 -25 -35 0.4 1.5 TBD 22 24 2.0 1.5 +1.0 0 -35 TBD
TBD -
dBm dBm dBm dBm dBc dBc MHz/V MHz kBits/S
dB dB dB dB dBm dBm dB dB
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies
UHF FM/FSK Transmitter
12
CMX017 Advance Information
6.2
Packaging
Figure 7: 28-Pin Plastic SSOP Mechanical Outline: Order as part no. CMX017D6
6.3
Handling Precautions
As this device is a high performance RF integrated circuit and is ESD sensitive. Adequate precautions must be taken during handling and assembly of this device.
(c)1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480193.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies

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