MX COM Inc CMX018D6 Datasheet

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.