KESRX04IG datasheet, PDF - EEWORLD Datasheet

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KESRX04IG: Description260 to 470MHz. ASK Receiver with Power Down; File Size458KB，21 Pages; ManufacturerZarlink Semiconductor (Microsemi); Websitehttp://www.zarlink.com/

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260 to 470MHz. ASK Receiver with Power Down

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KESRX04

260 to 470MHz. ASK Receiver with Power Down

Preliminary Information

DS4997 - 1.5 August 1998

The KESRX04 is a single chip ASK (Amplitude Shift Key)

Receiver IC. It is designed to operate in a variety of low power

radio applications including keyless entry, general domestic

and industrial remote control, RF tagging and local paging

systems.

The receiver offers an exceptionally high level of integration

and performance to meet the local oscillator radiation require-

ments of regulatory authorities world-wide. Functionally the

device works in the same way as the KESRX01 with the added

features of low supply voltage, in-band interference rejection

(anti-jamming detector), a 2 stage power down to enable

receiver systems to be implemented with less than 1mA supply,

and a wide IF bandwidth and drive stage to interface to an

external ceramic IF band pass filter at intermediate frequencies

from 0.2MHz to 15MHz.

The KESRX04 is an ideal receiver for difficult reception

areas where high level interferers would jam the wanted signal.

The anti-jamming circuit allows operation to be possible with

interfering signals which are more than 14dB stronger than the

wanted signal, without the cost penalties of increased IF

selectivity and frequency accuracy.

IFFLT1

IFDC1

IFFLT2

RSSI

PIN 1

REF. SPOT

IFIN

IFDC2

VCC

IFOUT

VCCRF

MIXIP

RFOP

VEERF

RFIN

AGC

PEAK

DATOP

DETB

XTAL1

XTAL2

DF0

DF1

DF2

VCO1

VCO2

VEE

DSN

(9.80/10.01)

QP28

Figure 1 Pin Connections (top view)

FEATURES

In-band interference rejection (typ. 14dB)

-103dBm Sensitivity (IF BW = 470kHz)

AGC around LNA and Mixer

Low supply voltage (3 to 6V)

2 stage power-down for low current applications

Interface for ceramic IF filters up to 15MHz

APPLICATIONS

Remote Keyless Entry

Security, tagging

Remote Controlled equipment

ORDERING INFORMATION

KESRX04/IG/QP1S (anti-static tubes)

KESRX04/IG/QP1T (tape and reel)

ABSOLUTE MAXIMUM RATINGS

Supply Voltage Vcc

Storage temperature,Tstg

Junction Temperature, Tj

RF Input power

-0.5V to +7V

-55 to 150°C

+20dBm from 50Ω

agc

RF Input

mixer

Ceramic

IF Filter

RSSI detector

Anti-jam data filter

Slicer

SAW

Filter

LNA

Noise

reduction

Filter

Local

Oscillator

Sliced

data

Ref

Figure 2 Typical system application

KESRX04

Notes:

The Sensitivity of the test fixture Figure 12 is degraded by loading the input to RF amplifier with 50 ohms, lack of image

rejection and increasing the data filter bandwidth to 50kHz. Sensitivity is defined as the average signal level measured

at the input necessary to achieve a bit error ratio of 0.01 where the input signal is a return to zero pulse at 470MHz.,with

an average duty cycle of 50%, 20kB/s data rate with the receiver bandwidth set to 470kHz.

Peak RF input level, pin RFIN, to overload the demodulator with the AGC operating. Equivalent to +7dBm for 50 ohm

input impedance. Where the input signal is a return to zero pulse at 470MHz. with an average duty cycle of 50%.

20kB/s data rate with the receiver bandwidth set to 470kHz.

Sensitivity is defined as the average signal level measured at the input necessary to achieve a bit error ratio of 0.01 where

the input signal is a return to zero pulse with an average duty cycle of 50%, 1kB/s data rate. Equivalent to -103dBm for

50ohm input impedance. Does not include insertion loss of SAW filter at RF input but does include IF filter of 470kHz

3dB bandwidth and a data filter bandwidth of 5kHz. This equates closely to a measurement of tangential sensitivity.

The performance of the power down option PD1 to PD2 cannot be guaranteed below 3V for temperatures less than 0°C

Time taken for PLL lock voltage to achieve 90% transition point of the control signal and the VCO frequency to achieve

within 470kHz of the final frequency. The time taken to acquire PLL acquisition is governed by the PLL loop filter (C12,

C1 and R2) and the crystal oscillator components (XTAL1, C13 and C14). The dominant term for PLL aquistion is the start-

up time of the crystal oscillator circuit, provided the PLL loop filter settling time is much less than the crystal oscillator start-

up time. Figure 6 illustrates a suitable test setup for measuring the acquisition time of the PLL. The electrical

characterisation parameters are based on the following set of conditions:

Crystal Oscillator circuit

C13 = C14

15pF

XTAL 1

Freq.

6.6128 MHz.

ESR

15.3

Ω

85.36 mH

1.83 pF

6.8 fF

PLL loop filter

C12 = 1.5 nF,

C1 = 180pF

R1 = 10KΩ

Local oscillator power fed back into 50ohm source at antenna input (RF input). Measured with RF input matching network

shown in Figure 11.

In-band interference rejection for an unmodulated interfering signal at 100kHz. low side from the wanted modulated signal

at 433.92MHz. to achieve a Bit Error Rate =0.01. Figure 5 illustrates a suitable test set-up for measuring the interference

rejection and selectivity of the receiver.

Wanted signal =

(1kB/s. 50% duty cycle)

Interfering signal =

(unmodulated)

-90dBm at 433.92MHz.

-76dBm at 433.82MHz.

Interference rejection typically equals +14dBm.

i.e. in-band interfering signal is 14dBm above the wanted signal level at –90dBm.

Actual intermediate frequency determined by choice of crystal and external ceramic filter.

KESRX04IG Related Products

	KESRX04IG	KESRX04	KESRX04QP1S	KESRX04QP1T
Description	260 to 470MHz. ASK Receiver with Power Down	260 to 470MHz. ASK Receiver with Power Down	260 to 470MHz. ASK Receiver with Power Down	260 to 470MHz. ASK Receiver with Power Down

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