Datasheet CMX018D6 Datasheet (MX COM Inc)

DATA BULLETIN

CMX018

UHF FM/FSK Receiver

Features Applications

•

Double Conversion Super-Heterodyne
Receiver and FM/FSK Demodulator

•

LNA with Switched Gain

•

High Performance UHF Down-Converter
Stage with Integrated VCO

•

2.7V Operation

•

Zero-Power Mode (<10µA)

•

Temperature Compensated RSSI

•

28-Pin SSOP Package

GAINSEL

ST

1DOWN

CONVERTER

TAN K

VCO

BUFFERED

OSCILLATOR

OUTPUT

OSCOUT OSCBA OSCEM

CONVERTER

ND

2DOWN

•

High Performance Analog/Digital
Radio Links (860-965MHz)

•

General ISM 915MHz Band

•

Analog/Digital Cordless Phones

•

Spread Spectrum Receivers

•

Analog FM Receivers

•

Handheld Data Terminals

•

SO-HO Wireless Data Links

ENABLE

BANDGAP

& BIAS

CONTROL

IF LIMITING

AMPLIFIER

ADVANCE INFORMATION

RSSI

LNAIN

FM/FSK

DISCRIMINATOR

LNA

LNADEC

50W

MIX1IN

MIX1OUT

100W100W50W 430W

MIX2OUT

MIX2IN

LIMIN

LIMDEC1

430W

LIMOUT QUADINLIMDEC2LNAOUT

50W

DETOUT

The CMX018 is a single chip UHF FM/FSK double-conversion super-heterodyne receiver. It combines a dual
gain mode Low Noise Amplifier (LNA), two down-converters (including integrated oscillators), limiting
amplifier, RSSI, FM/FSK demodulator and zero-power mode control.

The CMX018 can be used in conjunction with the CMX017, an integrated FM/FSK modulator and transmitter,
to implement a complete UHF radio link.

The CMX018 operates from a 2.7V to 3.3V power supply and is available in the following package style:
28-pin SSOP (CMX018D6).

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 2 CMX018 Advance Information

CONTENTS

Section Page

1 Internal Block Diagram..................................................................................................3

2 Signal List.......................................................................................................................4

3 External Components....................................................................................................5

4 General Description.......................................................................................................6

4.1 Low Noise Amplifier............................................................................................................. 6

4.2 First Down-Converter .......................................................................................................... 6

4.3 Second Down-Converter ..................................................................................................... 6

4.4 Limiting Amplifier and RSSI................................................................................................. 6

4.5 FM/FSK Demodulator.......................................................................................................... 6

4.6 Zero-Power Mode................................................................................................................ 6

5 Application Notes ..........................................................................................................7

5.1 General................................................................................................................................ 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.....................................................................................................11

6.2 Packaging.......................................................................................................................... 13

6.3 Handling Precautions ........................................................................................................ 13

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

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 3 CMX018 Advance Information

1

Internal Block Diagram

LNAIN

GND

LNAOUT

GND

MIX1IN

MIX1OUT

GND

MIX2IN

1

28

ENABLE

LNA

27

26

25

24

23

22

GAINSEL

LNADEC

V 1

CC

GND

TANK

V 2

CC

2

3

4

ST

1DOWN

5

CONVERTER

6

7

BUFFERED

VCO OUTPUT

21

8

OSCOUT

MIX2OUT

GND

LIMIN

LIMDEC1

LIMDEC2

RSSI

10

11

12

13

14

20

9

ND

2DOWN

OSCBA

CONVERTER

19

OSCEM

18

IF LIMITING

DETOUT

AMPLIFIER

430W

17

V 3

CC

FM/FSK

DEMODULATOR

16

LIMOUT

15

QUADIN

Figure 1: Internal Block Diagram

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 4 CMX018 Advance Information

2 Signal List

Pin No. Signal

Description

Package D6 Name Type

1 LNAIN input LNA RF Input
2 GND ground LNA Ground connection
3 LNAOUT output LNA RF Output
4 GND ground LNA Ground connection
5 MIX1IN input RF Input to the First Down-Converter
6 MIX1OUT output IF Output from the First Down-Converter
7 GND ground First Down-Converter Ground connection
8 MIX2IN input RF Input to the Second Down-Converter
9 MIX2OUT output IF Output from the Second Down-Converter

10 GND ground Second Down-Converter, Limiting Amplifier, RSSI, and

Demodulator stages - Ground connection
11 LIMIN input Input to the Limiting Amplifier
12 LIMDEC1 input
13 LIMDEC2 input

External Decoupling capacitors – one required at each limiting

Amplifier Inputs
14 RSSI output Receive Signal Strength Indicator output

15 QUADIN input Quadrature input to the FM Demodulator
16 LIMOUT output Output from the Limiting Amplifier
17 Vcc3 power Power supply to the Second Down-Converter, Limiting Amplifier,

RSSI and Demodulator stages – nominally 3.0V
18 DETOUT output Output of the FM/FSK Quadrature Demodulator
19 OSCEM

Emitter connection to the Second Down-Converter Local Oscillator

transistor
20 OSCBA Base connection to the Second Down-Converter Local Oscillator

transistor
21 OSCOUT output

Buffered Local Oscillator (Open-Collector) output from the First

Down-Converter
22 VCC2 power First Down-Converter 3V Supply
23 TANK input

First Down-Converter Local Oscillator (VCO) TANK/Resonator

connection
24 GND ground First Down-Converter VCO Ground connection

25 VCC1 power LNA Power Supply – nominally 3.0V
26 LNADEC External LNA bias decoupling capacitor
27 GAINSEL CMOS input LNA Gain control logic input. A logic ‘0’ provides a typical power

gain of 16dB and a logic ‘1’ provides an attenuation of 6dB
28 ENABLE CMOS input Zero-Power logic control. A logic ‘0’ powers down the device.

Table 1: Signal List

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 5 CMX018 Advance Information

3 External Components

3V

FSK Modulated RF

Input Signal

RSSI Outout

BPF

CF = 915MHz

BPF

CF = 915MHz

BPF

CF = 70.875MHz

BPF

CF = 10.7MHz

0V

Dis

LNAIN

1

GND

2

LNAOUT

3

GND

4

MIX1IN

5

MIX1OUT

6

GND

7

MIX2IN

MIX2OUT

GND

LIMIN

C1

LIMDEC1
LIMDEC2

C2

RSSI

CMX018D6

8
9
10
11
12
13
14

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

ENABLE
GAINSEL
LNADEC
V

CC1

GND
TAN K
V

CC2

OSCOUT
OSCBA
OSCEM
DETOUT
V

CC3

LIMOUT
QUADIN

C6

EnLoHi

C13

3V

0V

C15

C14

3V

C

DEC

C

DEC

L1

L2

C

RESONAT OR

C11 C12

3V

DEC

L3

To Audio Amplifier/DataBit Slicer

R1

VCO control from PLL

D1

C9

C7

R2

RF to PLL

C10

60.174MHz
50ppm

C8

R3

=750mV/kHz;

C4

C5

L4

100pF

C

DEC

=

10nF

1Fm

DISCRIMINATORSENSITIVITY

C3

measured at DETOUT(pin 18)

Figure 2: Example of CMX018 with External Components

C1 100nF C15 100pF
C2 100nF D1 Varactor Varactor diode, type SMV1233-011
C3 100nF ~ Resonator Co-Axial Resonator, type RG402, length = 11mm, shorted end
C4 200pF L1 22nH
C5 8 – 50pF

L2 680nH

Trimmer
C6 5pF L3 680nH
C7 220pF L4
C8 6.8pF R1
C9 15pF R2

C10 33pF R3

1µH
10k
10k

2.0k

Ω
Ω

Ω

Value is application dependent
C11 4.7pF
C12 6.2pF X1 60.175MHz 50ppm crystal
C13 10nF
C14 100pF

Note: Components are surface mount, type SMD0603, unless otherwise indicated.

Table 2: Example of CMX018 with External Components

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 6 CMX018 Advance Information

4 General Description

The CMX018 is a single chip UHF FM/FSK double-conversion super-heterodyne receiver. It combines a dual
gain mode Low Noise Amplifier (LNA), two down-converters (including integrated oscillators), limiting
amplifier, RSSI, FM/FSK demodulator and zero-power mode control.

The receiver frequency is selected using an external PLL or synthesizer, which is driven by the buffered RF
oscillator signal from the first down-converter.

The CMX018 can be used in conjunction with the CMX017, an integrated FM/FSK modulator and transmitter,
to implement a complete UHF radio link.

4.1 Low Noise Amplifier

The LNA includes a switched gain function, which is used to increase the dynamic range of the receiver. The
gain is selected using the GAINSEL logic input at pin 2. With a logic ‘0’ at the GAINSEL input a high gain is
selected and the amplifier achieves the lowest noise figure. This mode is used where maximum sensitivity is
required for low level input signals. Where high level signals are present at the receiver input, which cause
difficulties due to inter-modulation, the gain of the LNA can be reduced by typically 22dB from about +16dB to
about –6dB. The attenuation is selected by applying a logic ‘1’ at the GAINSEL input; this minimizes the
amount of non-linear distortion in the overall receiver at the expense of small signal sensitivity. The input and
output impedances of the LNA are typically 50Ω.

4.2 First Down-Converter

The first down-converter includes a double balanced mixer with a low noise pre-amplifier, and on-chip
oscillator components. The oscillator is configured as a ‘high-sided’ voltage controlled local oscillator, using
an external varicap diode and tank resonator circuit, such that the first IF is typically centered at 70MHz. A
buffered oscillator signal (OSCOUT at pin 21) is provided to drive the frequency synthesizer which controls
the frequency tuning. The input impedance is typically 50Ω and the output impedance is typically 100Ω.

4.3 Second Down-Converter

The second down-converter also includes a double balanced mixer with a low noise pre-amplifier, and on-chip
oscillator components. The oscillator is configured as a ‘low-sided’ local oscillator, using an external crystal at
typically 60MHz, such that the second IF is centered at 10.7MHz. The input impedance is typically 100Ω and
the output impedance is typically 430Ω.

4.4 Limiting Amplifier and RSSI

The limiting amplifier provides the IF amplification and limiting prior to the FM/FSK demodulator. An RSSI
circuit is included which has temperature compensation. An RF signal level of -100dBm at the LNA input will
produce an RSSI voltage of typically TBD mV. The RSSI voltage will increase with increasing RF input level
at a rate of 20mV/dB up to a typical voltage of TBD V at a -60dBm RF input. In practice the absolute RSSI
voltage will depend upon the insertion losses associated with each of the IF filters. The input impedance is
typically 430Ω.

4.5 FM/FSK Demodulator

A quadrature detector is employed together with an external discriminator and phase shift network to
demodulate the FM or FSK signal.

4.6 Zero-Power Mode

The device is powered down by applying a logic ‘0’ level at the ENABLE input (pin 28). In this mode the
device current is reduced to less than 10µA. This feature is useful when the device is operating within a
transceiver where the receiver needs to be enabled and disabled.

A delay should be allowed for the receiver to settle after power-up. This is likely to be less that the crystal
oscillator stabilization time, which may be altered by adjusting the value of R2, shown in Figure application.

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 7 CMX018 Advance Information

5 Application Notes

5.1 General

Example Schematic and Layout

The following schematic (Figure 3) and printed circuit layout (Figure 4 and Figure 5) show a typical application
interface for the CMX018. To aid legibility, the schematic and layout are available electronically from the MX­COM 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 Motorola MC34072D-SO8
U3 IC Works WB1315X
U4 Analog Devices AD8532-SO8

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 8 CMX018 Advance Information

R16

100R

C93

C4

C2

RFIN

J2

C12

C9

N/C

N/C

33pF

3V

C24

C17

N/C

C8

N/C

5

FLT1

2

F5CH-915M-L2

SAW FILTER

OUT

IN

100pF

100pF

100pF

GND
GND
GND
GND

10nF

C47

10k

R15

N/C-3pF

C46

D1

C44

10pF

2

IN

1

GND

RXRESNR

C43

100nF

R14

100nF

100nF

C37

10k-N/C

1nF

4.7pF
C63

1nF

C45

33pF

C56

15pF

C57

L7

680nH

C69

10nF

C33

C320

1nF

1uF

L16

L15

L14

28

1

N/C

ENABLE

LNAIN

27

GAINSEL

GND1

2

C28

1nF

C36

26

25

24

23

22

21

20

TANK

VCC1

VCC2

LNADEC

OSCOUT

OSCGND

U4

CMX018D6

LNAOUT

GND2

MIX1IN

MIX1OUT

GND3

MIX2IN

3

4

5

6

7

8

9

C55

C35

100pF

C34

100pF

19

OSCBA

MIX2OUT

10

OSCEM

GND4

1nF

C68

18

17

16

15

VCC3

LIMOUT

QUADIN

DETOUT

LIMIN

LIMDEC1

LIMDEC2

RSSI

11

12

13

14

100nF

C66

100nF

C65

1nF

C60

3

3

2

OUT

1

GND

IN

1

U5

KMFC545S

N/C

C27

C38

100pF

6
4
3
1

C21

N/C

2

FLT2

5

F5CH-915M-L2

SAW FILTER

IN

OUT

C30

GND

1

GND

3

GND

4

GND

6

100pF

C31

L6

C54

C42

12.5nH

360pF

C41

N/C

33pF

L5

8nH

C52

C26

C40

33pF

L4

C50

12.5nH

C39

N/C

360pF

C64

C62

5pF

XT1

OUT
IN

N/C

180pF

330pF

180pF

6.8pF

GND

C53

C51

C49

220pF

C72

R22

2

U6

R1

HC49U-S

R18

C73

L10

KMFC545P

0R-N/C

L9

L8

CV1206

200pF

2k

1uH

C77

120pF

120+27pF

120pF

C1

L1

N/C

10k-N/C

680nH

5V

100nF

15uH

C3

1nF

7

( -NC)

2.2uF

1

6

AD8532-SO8

R6

8

+

U1

3

R3

N/C

0R

5

4

-

2

R7

R8

C18

47K - N/C

1k

470nF

C19

100nF

100pF

C20

L3

22nH

3V

C29

100pF

2.2uF

C16

100pF

C15

100nF

C14

5V

15uH

L2

C23

100pF

20

19

18

17

16

15

14

13

12

11

VP2

VCC2

VCC1

VP1

1

2

LE

DO2

GND

GND

FIN2

DATA

FIN2B

CLOCK

U3

WB1315X

SYNT_STB

SYNT_CLK

DO1

GND

FIN1

FIN1B

GND

OSC_IN

3

GND

4

5

6

7

8

9

10

FO_LD

SYNT_DATA

100pF

C13

C61

2k2

N/C

R47

R10

2

J1

1

100pF

C58

100pF

C59

100pF

C48

C22

100pF

1nF

C25

100pF

100pF

C460

100pF

1uF

C67

4

6

3

5

R100

C81

3V

5V

L11

100pF

820nH

C470

100nF

8

10

12

14

16

7

9

11

13

15

100

100pF

C10

10nF

C87

C80

18

20

100nF

C79

17

19

TFMCON20M

100uF

C78

7

R4

6p8

C71

100k

+

-

6

5

100k

R9

R2

10k

R5

100k

C7

C6

C5

1nF

1nF

C70

2.2uF
U2

4

-

2

2.2uF

C32

47nF

1nF

C11

1

MC34072D

8

+

3

5V

Figure 3: Application Schematic

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 9 CMX018 Advance Information

Figure 4: Application Layout - Top Copper

Figure 5: 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. # 20480194.003

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

UHF FM/FSK Receiver 10 CMX018 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.

Pins Min. Max. Units

Supply Voltage (VCC) 17, 22, 25 -0.3 7.0 V
Input Voltage 27, 28 -0.3 V
LNA Input Power 1 0 dBm

D6 Package

Total Allowable Power Dissipation at T

= 25°C 550 mW

AMB

Derating above 25°C

Storage Temperature -55 +125 °C

6.1.2 Operating Limits

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

Notes Min. Max. Units

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

+ 0.3 V

CC

9

mW/°C above 25°C

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 11 CMX018 Advance Information

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

ICC (ENABLE = VCC and GAINSEL = 0V) 17, 22, 25 50 mA
ICC (ENABLE = VCC and GAINSEL = VCC) 17, 22, 25 42 mA
ICC (ENABLE = 0V) 17, 22, 25 10

AC Parameters

LNA (RF = 915MHz)

Power Gain (GAINSEL = 0V) 1, 3 16 dB

Power Gain (GAINSEL = VCC) 1, 3 -6.0 dB
Noise Figure 1, 3 3.0 dB
Input 1dB Gain Compression Point (GAINSEL = 0V) 1 -20 dBm
Input 1dB Gain Compression Point (GAINSEL = VCC) 1 16 dBm
Input Third Order Intercept Point (GAINSEL = 0V) 1 -10 dBm
Input Third Order Intercept Point (GAINSEL= VCC) 1 25 dBm
Reverse Isolation (GAINSEL = 0V) 3, 1 -35 dB
Reverse Isolation (GAINSEL = VCC) 3, 1 -6.0 dB
Input Impedance 1 50
Output Impedance 3 50

Input Return Loss (50Ω source)
Output Return Loss (50Ω load)

1
3

10
15

VCO to LNA Leakage 1 -45 dBm

First Down Converter
(RF = 915MHz and IF = 70MHz)

Conversion Gain 5, 6 15 dB

Noise Figure 5, 6 15 dB

Input 1dB Gain Compression Point 6 -12 dBm

Input Third Order Intercept Point 6 -4.0 dBm

Input Impedance 5 50

Output Impedance 6 100

Input Return Loss (50Ω source)

Output Return Loss (50Ω load)

5TBDdB

6TBDdB
Buffered oscillator output power 21 -10 dBm
RF to IF Leakage 5, 6 TBD dB
LO to IF Leakage 6 TBD dBm
LO to RF Leakage 5 TBD dBm

µ

Ω
Ω

dB
dB

Ω
Ω

A

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 12 CMX018 Advance Information

Pin Note Min. Typ. Max. Units

Second Down Converter
(RF = 70MHz and IF = 10.7MHz)

Conversion Gain 8, 9 24 dB
Noise Figure 8, 9 13 dB
Output 1dB Gain Compression Point 9 -11 dBm
Output Third Order Intercept Point 9 -2 dBm
Input Impedance 8 100
Output Impedance 9 430

Ω
Ω

Limiting Amplifier and RSSI
(IF = 10.7MHz)

Bandwidth 11, 16 40 MHz
Internal Voltage Gain 11 74 dBV
Input Impedance 11 430
RSSI Dynamic Range 14
RSSI Slope 14
RSSI Voltage Range 14 1

TBD
TBD
TBD

Ω

dB

V/dB

V
Demodulator (IF = 10.7MHz)
Output Swing 18 2

TBD

Output Impedance 18 1

MV

k

P-P

Ω

Notes:

1. Input power = TBD to TBD

2. 125kHz Deviation, 1kΩ Load

1999 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480194.003

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

UHF FM/FSK Receiver 13 CMX018 Advance Information

6.2 Packaging

Figure 6: 28-Pin Plastic SSOP Mechanical Outline:

Order as part no. CMX018D6

6.3 Handling Precautions

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. # 20480194.003

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