RX3G [RADIOMETRIX]

UHF FM receiver module with RSSI; 与RSSI UHF调频接收模块


型号：	RX3G
厂家：	RADIOMETRIX LTD
描述：	UHF FM receiver module with RSSI 与RSSI UHF调频接收模块
文件：	总6页 (文件大小：174K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Radiometrix

Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England

Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233

Issue 2, 13 November 2012

RX3G

UHF FM receiver module with RSSI

The RX3G is a PLL synthesiser based

miniature PCB mounting UHF radio

data receiver.

With

the

matching

TX3B-869-64

transmitters, RX3G allows the simple

implementation of wireless data links

at speeds up to 64kbps and distances up

to 75 metres in-building or 300 metres

over open ground.

Fig 1: RX3G-869.85-64

Features:

 Designed to comply with harmonised radio standard EN 300 220-3

 Designed to comply with harmonised EMC standard EN 301 489-3

 North American version conforms to FCC part 15.249

 Data rates up to 128kbps

 Usable range up to 300m

 Versions available on 868.3MHz, 869.5MHz, 869.85MHzn and

 Regulated and Unregulated versions available

 Fully screened

 Improved blocking performance

 Fast data settling time

Available for operation at 868.3MHz, 869.5MHz and 869.85MHz in Europe, the RX3G

combines full screening with internal filtering to ensure EMC compliance by minimising

spurious radiation and susceptibility. The module suits one-to-one and multi-node wireless

links in applications including car and building security, EPOS and inventory tracking,

remote industrial process monitoring and computer networking. Because of the small size and

low power requirements, the RX3G is ideal for use in portable, battery-powered wireless

applications such as hand-held terminals.

Technical Summary

 Single conversion FM superhet

 SAW front end filter gives >50dB image rejection

 Supply: +5V (± 10%)

 Current consumption: 10mA (typ.)

 -102dBm sensitivity @ 1ppm BER, 64kbps version

 -108dBm sensitivity @ 1ppm BER, 15kbps version

 RSSI output with 50dB range

 Extremely low LO leakage, -125dBm typical

Evaluation platforms: Universal Evaluation Kit, NBEK + SIL carrier

Radiometrix Ltd

RX3G data sheet

page 1

Pin description

RF IN

(pin 1)

50 input from the antenna, DC

isolated.

RF GND

RF ground

(pin 2)

pin,

internally

connected to the module screen and

pin 6 (0V). This pin should be

connected to the RF return path

(coax braid, main PCB ground

plane etc.)

Fig 2: physical dimensions & pin outs

RF GND

(pin 3)

Not fitted on non-regulator 5V variant

En (Regulator version) (pin 4)

Rx enable. <0.15V shuts down module (current <1uA). >1.7V enables the receiver. Impedance

~1Mohm. Observe slew rate requirements (see apps notes).

Not fitted on non-regulator 5V variant.

RSSI

(pin 5)

Received signal strength indicator with 60dB range. See page 4 for typical characteristics.

(pin 6)

DC supply ground. Internally connected to pin 2/3 and module screen.

Vcc (5V variant)

(pin 7)

Externally regulated 5V DC supply. Max ripple content 0.1V_p-p.

Vcc (for regulator variant)

(pin 7)

5.1V to +16V DC supply. Max ripple content 0.1Vp-p. Decoupling is not generally required.

AF out

(pin 8)

Buffered and filtered analogue output from the FM demodulator. Standing DC bias 2V approx.

External load should be >10k // <100pF.

RXD

(pin 9)

This digital output from the internal data slicer is a squared version of the signal on pin 8

(AF). It may be used to drive external decoders. The data is true data, i.e. as fed to the

transmitter.

Radiometrix Ltd

RX3G data sheet

page 2

Absolute maximum ratings

Exceeding the values given below may cause permanent damage to the module.

Operating temperature

Storage temperature

-20C to +70C

-40C to +100C

Vcc (pin 7)

-0.1V to +5.5V

RSSI, AF, RXD (pins 5,8,9) -0.1V to +3V

RF IN (pin 1)

50V DC, +10dBm RF

Performance specifications

(Vcc = 5.0V / temperature = 20 C unless stated)

pin min.

typ.

max units

notes

DC supply

Supply voltage

Supply voltage (regulator ver.)

Supply current

4.5

5.0

5.5

RF/ IF

RF sensitivity for 10dB (S+N/N)

RF sensitivity for 1ppm BER

RSSI range

1,2

-113

-108

-102

dBm

15kbps version

64kbps version

IF bandwidth

180

kHz

Image rejection

IF rejection (10.7MHz)

LO leakage, conducted

100

-125

dBm

-110

Baseband

Baseband bandwidth @ -3dB

AF level

DC offset on AF out

Distortion on recovered AF

200

1.5

7.8

350

2.5

kHz

mV_P-P

15kbps version

64kbps version

250

Load capacitance, AFout/RXD

3,8

100

DYNAMIC TIMING

Power up with signal present

Power up to valid RSSI

Power up to stable data

3,5

3,9

0.5

1.5

3, 15kbps version

3, 64kbps version

3, -DS version

Signal applied with supply on

RSSI response time (rise/fall)

Signal to stable data

1,5

1,9

100

0.5

μs

3, 15kbps

3, 15kbps DS

3, 64kbps

0.2

0.5

Signal to stable data

3, 64kbps DS

Time between data transitions

Mark:space ratio

0.0667

0.0156

1.5

0.2

4, 15kbps

4, 15kbps DS

4, 64kbps

4, 64kbps DS

Notes:

1. Current increases at higher RF input levels (>-20dBm and above).

2. For received signal with ±30kHz FM deviation.

3. Typical figures are for signal at centre frequency, max. figures are for ±50kHz offset.

4. For 50:50 mark to space ratio (i.e. squarewave).

5. Average over 10ms (15kbps version) or 3ms (64kbps version) at maximum data rate.

Radiometrix Ltd

RX3G data sheet

page 3

Power supply requirements

The standard RX3G requires a regulated 5V supply with ripple content <100mV_pk-pk

However, built-in regulator in the regulator version RX3G delivers a constant 5V to the

module circuitry when the external supply voltage is 5V or greater, with 40dB or more of

supply ripple rejection. This ensures constant performance up to the maximum permitted

supply rail (16V max.) and removes the need for external supply decoupling except in cases

where the supply rail is extremely poor (ripple/noise content >0.1V_p-p).

Note, however, that for supply voltages lower than 5V the regulator is effectively inoperative

and supply ripple rejection is considerably reduced. Under these conditions the ripple/noise on

the supply rail should be below 10mV_p-pto avoid problems. If the quality of the supply is in

doubt, it is recommended that a 10F low-ESR tantalum or similar capacitor be added

between the module supply pin (Vcc) and ground, together with a 10 series feed resistor

between the Vcc pin and the supply rail.

Received Signal Strength Indicator (RSSI)

The module incorporates a wide range RSSI which measures the strength of an incoming

signal over a range of approximately 50dB. This allows assessment of link quality and

available margin and is useful when performing range tests.

The output on pin 5 of the module has a standing DC bias in the region of 0.5V with no signal,

rising to around 1V at maximum indication. The RSSI output source impedance is high

(~100k) and external loading should therefore be kept to a minimum.

To ensure a fast response the RSSI has limited internal decoupling of 10nF to ground. This

may result in a small amount of ripple on the DC output at pin 5 of the module. If this is a

problem further decoupling may be added, in the form of a capacitor from pin 5 to ground, at

the expense of response speed.

Typical RSSI characteristic is as shown below:

1100

1000

900

800

700

600

500

400

300

200

-130

-120

-110

-100

-90

-80

-70

-60

-50

RF input level (dBm)

Radiometrix Ltd

RX3G data sheet

page 4

Module mounting considerations

The module may be mounted vertically or bent horizontal to the motherboard. Good RF layout

practice should be observed – in particular, any ground return required by the antenna or feed

should be connected directly to the RF GND pin at the antenna end of the module, and not to

the 0V pin which is intended as a DC ground only. All connecting tracks should be kept as

short as possible to avoid any problems with stray RF pickup.

If the connection between module and antenna does not form part of the antenna itself, it

should be made using 50 microstrip line or coax or a combination of both. It is desirable (but

not essential) to fill all unused PCB area around the module with ground plane.

The module may be potted if required in a viscous compound which cannot enter the screen

can.

Warning: DO NOT wash the module. It is not hermetically sealed.

Variants and ordering information

The RX3G receivers are manufactured in several variants:

Data rate: Slower version:

7.8kHz baseband B/W,

(suffix -15)

50kHz baseband B/W,

(suffix -64)

50kHz baseband B/W,

(suffix -128)

data rate up to 15kb/s

data rate up to 64kb/s

data rate up to 128kb/s

Faster version:

Frequency: 868.30MHz (suffix –868.30)

869. 50MHz (suffix -869.50)

869.85MHz (suffix –869.85)

914.50MHz (suffix –914.50)

The following data rate variants are standard:

RX3G-869.85-15-5V-DS

RX3G-869.85-64-5V-DS

869.85MHz, 15kb/s Data Slicer for Non-bit balanced data

869.85MHz, 64kb/s Data Slicer for Non-bit balanced data

RX3G-869.85-15-5V

RX3G-869.85-64-5V

869.85MHz, 15kb/s Manchester Encoded data packet with preamble

869.85MHz, 64kb/s Manchester Encoded data packet with preamble

RX3G-869.85-128-5V

869.85MHz, 128kb/s

Regulator version:

RX3G-869.85-15-DS

RX3G-869.85-64-DS

RX3G-869.85-128

869.85MHz, 15kb/s

869.85MHz, 64kb/s

869.85MHz, 128kb

Matching Transmitters:

TX3B-869.85-64

869.85MHz

For other variants please contact the sales department

Evaluation platforms:

1. Universal Evaluation Kit

2. NBEK + SIL carrier

Radiometrix Ltd

RX3G data sheet

page 5

Radiometrix Ltd

Hartcran House

231 Kenton Lane

Harrow, Middlesex

HA3 8RP

ENGLAND

Tel: +44 (0) 20 8909 9595

Fax: +44 (0) 20 8909 2233

sales@radiometrix.com

www.radiometrix.com

This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in

part must give clear acknowledgement to the copyright owner.

Limitation of liability

The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the

right to make changes or improvements in the design, specification or manufacture of its subassembly products without

notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit

described herein, nor for any infringements of patents or other rights of third parties which may result from the use of

its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular

application. These radio devices may be subject to radio interference and may not function as intended if interference is

present. We do NOT recommend their use for life critical applications.

The Intrastat commodity code for all our wireless modules is: 8542 6000

R&TTE Directive

After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the R&TTE

Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the essential

requirements specified in Article 3 of the Directive, as appropriate to the particular equipment.

Further details are available on The Office of Communications (Ofcom) web site:

http://www.ofcom.org.uk/radiocomms/ifi/

Information Requests

Ofcom

European Radiocommunications Office (ERO)

Peblingehus

Riverside House

Nansensgade 19

2a Southwark Bridge Road

London SE1 9HA

Tel: +44 (0)845 456 3000 or 020 7981 3040

Fax: +44 (0)20 7783 4033

information.requests@ofcom.org.uk

DK 1366 Copenhagen

Tel. +45 33896300

Fax +45 33896330

ero@ero.dk

www.ero.dk

RX3G [RADIOMETRIX]

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