XE1209 データシートの表示（PDF） - Semtech Corporation

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XE1209

30 – 70 kH Ultra Low Power CMOS Transceiver

Semtech Corporation 

XE1209

Ultra Low Power CMOS Transceiver

1 PIN DESCRIPTION

Pin #

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Name

TEST

VSS

QIN

VDDA

QOUT

VSSA

IREF

VREF

SUPTEST

RE

INA

INB

VSSPA

PAOUT

VDD

DCLK

DATA

DE

SD

SC

Description

Test pin

Ground for digital

Xtal pin or input for external clock

Supply voltage for analog

Xtal pin

Ground for analog

Iref node for external resistance

Vref node for external capacitance

Test pin

Receiver enable

RF input signal

RF input signal

Ground for RF power amplifier

RF power amplifier output

Supply voltage for digital

Received data clock output

Input/output bit stream or output of the carrier detector

Data enable for 3-wire communication

Data input for 3-wire communication

Clock input for 3-wire communication

2 TYPICAL APPLICATION

The product is to be used in a system for low frequency RF data communications. The transmission is made with 2-

level CPFSK modulation. The modulated signal has a carrier frequency fc and a deviation frequency ∆f; the coding of

the data is the following:

fRFin = fc + ∆f ≡ “1”

fRFin = fc - ∆f ≡ “0”.

above shows the structure of the transceiver and the external components required by the application. A 3-wire

bus allows the product to receive configuration data from a microcontroller. Note: pin TEST remains unconnected.

2.1 TYPICAL EXTERNAL COMPONENTS

Besides the components needed for the RF communication itself, the following external components are required:

Name

Cvdd

Cvref

Riref

Xtal

Type

Capacitor

Capacitor

Resistance

Crystal

Pins to be connected

VDD - VSS

VREF - VSS

IREF - VSS

QIN - QOUT

Value

100 nF

47 nF

280 kΩ

32.768 kHz

Tolerance

± 10 %

± 10 %

±1%

± 20 ppm

Max. Temp. variation

± 5 % over -10 °C to 60 °C

± 5 % over -10 °C to 60 °C

± 100 ppm/K

- 50 ppm over -10 to 60 °C

The reference of the crystal used for Xtal is the following:

“DS26 watch crystal” from Micro Crystal Switzerland

3 GENERAL FUNCTIONAL DESCRIPTION

The XE1209 is composed of 6 main functional blocks:

Receiver

The receiver channel converts a 2-level CPFSK modulated signal into a bit stream. It is composed of the following

blocks: preamplifier, down-converters (0-IF architecture), channel filters, limiters, demodulator, and bit

synchronizer.

© Semtech 2005

www.semtech.com

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