Datasheet CMX017D6 Datasheet (MX COM Inc)

DATA BULLETIN

CMX017

UHF FM/FSK Transmitter

ADVANCE INFORMATION

Features Applications

•

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
(<10µA) Modes

•

28-Pin SSOP Package

MODIN

FM/FSK

MODULATOR

POWER

AMPLIFIER

DRIVER

GAIN MODOUT PAIN IPAOUT

•

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

POWER

AMPLIFIER

PAOUT

TAN K

BUFFERED

OSCILLATOR

OUTPUT

OSCOUT

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).

BANDGAP & BIAS

CONTROL

ENLMOD

ENLPA

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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 FM/FSK Modulator + PA Driver........................................................................................... 6

4.2 Power Amplifier (PA) ........................................................................................................... 6

4.3 Power-Down Modes ............................................................................................................ 6

5 Application Notes ..........................................................................................................6

5.1 Generation of the Modulated RF Signal .............................................................................. 6

5.2 Power-Down Modes ............................................................................................................ 7

6 Performance Specification..........................................................................................10

6.1 Electrical Performance ...................................................................................................... 10

6.1.1 Absolute Maximum Ratings.................................................................................................. 10

6.1.2 Operating Limits...................................................................................................................10

6.1.3 Operating Characteristics.....................................................................................................10

6.1.4 Packaging.............................................................................................................................12

MX-COM, Inc reserves the right to change specifications at any time and without notice.

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] 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

V3

CC

GAIN

GND

GND

GND

IPAOUT

GND

GND

PAOUT

1

2

P A DRIVER

3

PA

4

ST AGE 1

5

BUFFERED

OSCILLATOR

OUTPUT

6

7

PA

ST AGE 2

8

FM/FSK

MODULATOR

9

28

27

26

25

24

23

22

21

20

PAIN

GND

MODOUT

GND

V2

CC

OSCOUT

V1

CC

GND

TANK

10

GND

11

GND

V4

ENLPA

12

CC

13

PACKAGE

14

GND GND

GROUND

SUBSTRA TE

PACKAGE
GROUND

19

18

17

16

15

Figure 1: Internal Block Diagram

GND

MODIN

GND

ENLMOD

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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. Signal

Description

D6 Package Name Type

1V

3 power Power amplifier (first stage) power supply - nominally 3.0V

CC

2 GAIN input Modulator output (pin 26) - Power control
3 GND ground Ground-plane connection to the power amplifier
4 GND ground Ground-plane connection to the power amplifier
5 GND ground Ground-plane connection to the power amplifier
6 IPAOUT output Output (open-collector) from the first stage of the power

amplifier
7 GND ground Ground-plane connection to the power amplifier
8 GND ground Ground-plane connection to the power amplifier
9 PAOUT output

Output (open-collector) from the second stage of the power

amplifier

10 GND ground Ground-plane connection to the power amplifier
11 GND ground Ground-plane connection to the power amplifier
12 VCC4 power Power amplifier (second stage) power supply

– nominally 3.0V

13 ENLPA

CMOS

input

Power Amplifier powersave logic control. A logic “0” powers

down the Power Amplifier and Driver stages

14 GND ground Ground-plane connection
15 GND ground Ground-plane connection
16 ENLMOD CMOS

input

Modulator zero-power logic control. A logic “0” powers down

the Modulator and Buffered Oscillator stages

17 GND ground Ground-plane connection
18 MODIN input Baseband modulation input signal
19 GND ground Ground-plane connection to the VCO
20 TANK input VCO Tank circuit/Resonator connection
21 GND ground Ground-plane connection to the modulator and VCO buffer
22 VCC1 power Modulator power supply – nominally 3.0V
23 OSCOUT output Buffered Oscillator (open-collector) output
24 VCC2 power Power Amplifier Driver power supply - nominally 3.0V
25 GND ground Ground-plane connection for the Power Amplifier Driver
26 MODOUT output Modulator output
27 GND ground Ground-plane connection for the Power Amplifier Driver
28 PAIN input Power Amplifier input

Table 1: Signal List

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UHF FM/FSK Transmitter 5 CMX017 Advance Information

3 External Components

POWER CONTROL

Tx SIGNAL

3V

V

C

DEC

C6

C7

C5

L1

L2

C8

C9

CC3

GAIN

GND
GND
GND

IPAOUT

GND
GND

PAOUT

GND
GND
V

CC4

ENLP A

GND

1
2
3
4
5
6
7

CMX017D6

8

9
10
11
12
13
14

28
27
26
25
24
23
22
21
20
19
18
17
16
15

PAIN
GND
MODOUT
GND
V

CC2

OSCOUT
V

CC1

GND
TANK
GND
MODIN
GND
ENLMOD
GND

L3

C1

RF to PLL

C2

C3

R2

C10

RESONA TOR

C4

R3

D1

R1R1

C11

L4

R4

SMD POT

3V

C

DEC

C12

R1

From PLL

BASE-BAND

ENABLE POWER AMPLIFIER

C

DEC

1Fm

º

100pF10nF

ENABLE MODULATOR

Figure 2: Example of CMX017 with External Components

C1 5.6pF C12 100pF
C2 33pF D1 Varactor Varactor diode, type SMV1233-011
C3 4.3pF ~ Resonator Co-Axial Resonator, type RG402, length = 11mm, shorted end
C4 TBD L1 1.5nH
C5 100pF L2 22nH
C6 100pF L3 6.8nH
C7 100pF L4 22nH
C8 100pF R1
C9 100pF R2

10k
10k

Ω
Ω

C10 100pF R3 TBD Value is application dependent
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

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] 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 V
output impedance at the MODOUT pin is typically 50Ω.

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 50Ω. A typical power gain
improvement of 2dB is achieved using simple external matching networks.

and is reduced by typically 20dB when this pin is connected to 0V. The

CC

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

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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 10µA. 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 V
connected to 3.0V.)

2 pin to 0V. (The VCC1 pin must remain

CC

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 V

3 and VCC4 (pins 1 and 12) to 0V. This

CC

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 IC Works WB1315X
U4 Analog Devices AD8532-SO8

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UHF FM/FSK Transmitter 8 CMX017 Advance Information

R2

100R

10nF

C9

R1

10k

3pF

C8

D1

C14

6.8pF

TXRESNR

IN

GND

2

1

1nF

C24

N/C

R9

C27

0R

N/C

L7

15uH

R13

5V

3V

C13

C11

100pF

23

OSCOUT

IPAOUT

6

22

7

100pF

21

20

TANK

VCC1

GND1

CMX017D6

GND7

GND8

PAOUT

8

9

4.7pF

C26

19

OSCGND

GND9

10

C18

100pF

3V

L6

100pF

R14

10K

18

17

16

15

GND

GND

MODIN

ENLMOD

GND10

VCC4

ENLPA

GND

11

12

13

14

20nH

L3

100nH

100nF

C6

N/C

L2

6.8nH

C1

C2

5.6pF

33pF

C7

28

27

26

25

24

PAIN

VCC2

GND3

GND2

MODOUT

U1

VCC3

GAIN

GND4

GND5

GND6

1

2

3

4

5

100pF

C3

L4

1.5nH

C10

100pF

L5

100pF

C5

100uF

C4

100pF

C12

22nH

C15

N/C

12pF

100pF

C16

C65

L1

100nH

33pF

C19

3V

J2

2.2uF
AD8532-SO8

8

U4

47k

5V

7

( - N/C)

1

6

+

-

3

2

0R

R18

5

4

R17

1k

R19

C36

100nF

C35

470nF

N/C

47k

100pF

C22

C37

100pF

19

18

17

16

15

14

13

12

11

GND

GND

4

FIN2

FIN2B

WB1315X

FIN1

FIN1B

5

6

LE

GND

DATA

CLOCK

SYNT_STB

SYNT_CLK

GND

OSC_IN

GND

FO_LD

7

8

9

10

SYNT_DATA

VP2

DO2

VCC2

U2

VCC1

VP1

DO1

2

3

100k

NF

R23

100k

NF

R22

100k

NF

R21

C34

C33

C32

L8

2.2uF

100pF

100nF

15uH

20

1

100pF

C46

C38

1nF

100pF

5V

C31

C42

C44

100pF

C145

100pF

100pF

10nF

C58

18

20

100nF

C57

17

19

TFMCON20M

100uF

C56

L9

15uH

C41

100pF

C39

J1

2

1

100pF

4

6

8

10

12

14

16

3

5

7

9

11

13

15

100

R100

C45

100uF

3V

100pF

100pF

C40

C48

C43

1uF

Figure 4: Application Schematic

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] 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 9 CMX017 Advance Information

Figure 5: Application Layout - Top Copper

Figure 6: Application Layout - Bottom Copper (not reversed)

Available from http://www.mxcom.com.

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] 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 Electrical Performance

6.1.1 Absolute Maximum Ratings

Exceeding these maximum ratings can result in damage to the device.

Pin Min. Max. Units

Supply (VCC) 1, 12, 22,24-0.3 7.0 V

Input Voltage 2, 13, 16,

-0.3 VCC + 0.3 V

18, 20

Power Amplifier Input Power 28 +7 dBm

D6 Package

Total Allowable Power Dissipation at T

= 25°C 1100 mW

AMB

Derating above 25°C 11 mW/°C above 25°C

Storage Temperature -55 +125 °C

Table 2: Absolute Maximum Ratings

6.1.2 Operating Limits

Correct operation of the device outside these limits is not implied.

Notes Min. Max. Units

Supply (VCC)2.73.3V
Operating Frequency Range 860 965 MHz
Operating Temperature -10 +60 °C

Table 3: Operating Limits

6.1.3 Operating Characteristics

For the following conditions unless otherwise specified:
V

= 2.7V to 3.3V, T

CC

= -10°C to +60°C,

AMB

RF = 915MHz, 50Ω source and load impedance.

Pin Note Min. Typ. Max. Units

DC Parameters

Device Fully Enabled

(ENLPA=HI and ENLMOD=HI)

ICC [Output Power = +20dBm at PAOUT (pin 9)] 1 - 130 - mA
ICC [Output Power = +10dBm at PAOUT (pin 9)] 1 - 60 - mA
ICC [Output Power = +0dBm at PAOUT (pin 9)] 1 - 40 - mA

Device in Power-Down Modes

I

in STANDBY mode

CC

ICC in SLEEP Mode

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(ENLPA=LO and ENLMOD=HI)

(ENLPA=LO and ENLMOD=LO)

1-24-mA
1-TBD10

µ

A

UHF FM/FSK Transmitter 11 CMX017 Advance Information

Pin Note Min. Typ. Max. Units

AC Parameters

Modulator, VCO Buffer and PA Driver

Output Power [GAIN (pin 2) at VCC]26--4.0-dBm
Output Power [GAIN (pin 2) at 1.5V] 26 - -9.0 - dBm
Output Power [GAIN (pin 2) at 1.0V] 26 - -14 - dBm
Buffered VCO Output at OSCOUT pin 19 2 - -10 - dBm
Oscillator Second Harmonic Output 26 3 - -25 - dBc
Oscillator Third Harmonic Output 26 3 - -35 - dBc
Modulation Sensitivity 18 4 - 0.4 - MHz/V
Maximum Deviation 26 5 - 1.5 - MHz
Input Data Rate 18 - - TBD kBits/S
Output VSWR (at maximum output power) 26 - TBD -

Power Amplifier

Power Gain 28, 9 - 22 - dB
Power Gain (with external matching at VCC = 3.3V) 28, 9 - 24 - dB
Maximum Power Gain Variation 28, 9 6 - 2.0 - dB
Maximum Power Gain Variation (with matching) 28,9 6 - 1.5 - dB
Input 1dB Compression Point 9 - +1.0 - dBm
Input 1dB Compression Point (with matching) 9 - 0 - dBm
Reverse Isolation 9, 28 - -35 - dB
Output VSWR (at maximum output power) 9 - TBD - dB

Notes:

1. Total current from the external 3V power supply.

2. Power measured into a 50Ω 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.

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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.

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480193.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies