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PDF KESRX01 Data sheet ( Hoja de datos )
| Número de pieza | KESRX01 | |
| Descripción | 290 - 460MHz ASK Receiver | |
| Fabricantes | Zarlink Semiconductor Inc | |
| Logotipo |  |
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KESRX01
290 - 460MHz ASK Receiver
Advance Information
DS3968 5.0 March1998
The KESRX01 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.
This single conversion super–heterodyne receiver offers
an exceptionally high level of integration and performance.
The unique architecture enables data rates up to 50Kbits/sec
to be supported. All low power radio regulations, including
ETSI–ETS 300 220, and FCC, part 15, can easily be met.
Local oscillator generation is performed by an on–chip PLL
which uses an external crystal reference oscillator (4.5 to
7.2MHz). All popular radio frequencies (315MHz, 433.92MHz,
etc) can then be supported by simply choosing the appropriate
crystal frequency.
Particular emphasis has been placed on low current
consumption, with pulsed ON/OFF operation allowing <1mA
average current consumption to be achieved. The on–chip
VCO and IF significantly minimise the external components
needed thus reducing any re–radiation effects.
FEATURES
s Very low supply current (2.30mA typical)
s Low external part count
s –105dBm sensitivity (typical 315MHz)
s Integrated VCO and IF Filters.
ORDERING INFORMATION
KESRX01/IG/QP1T (Tape and Reel)
KESRX01/IG/QP1S (Tubes)
IFDC1
IFDC2
IF2
IF1
VCC
MIXIP
RFOP
VEERF
RFIN
DSN
DATAOP
PEAK
1
2
3
4
5
6
7
8
9
10
11
12
24 XTAL2
23 XTAL1
22 DF2
21 DF1
20 DF0
19 LF
18 NC
17 NC
16 VCO2
15 VCO1
14 PD
13 VEE1
QPAQ2P4 24
Fig. 1 Pin connections - top view
ABSOLUTE MAXIMUM RATINGS
All voltages relative to V EE (0V)
Junction temperature, Tj
–55 to +150°C
Storage temperature, Tstg
–55 to +150°C
Supply voltage, V CC max
Voltage on any pin, Vshort
V CC –0.5 to +8.0 V
–0.5 to +8.0V
DF2 DF1 DF0
PEAK
PEAK DETECTOR
DATA FILTER
IF DC1 IF DC2 IF 2
LOG
AMP
IF 1 MIXIP RFOP
IF FILTER
600KHz
DATOP
DSN
VCC
VEE1
PD
+
DATA SLICER
–
RSSI O/P
XTAL
OSCILLATOR
MIXER
RFIN
DIV 64
PHASE FREQUENCY
DETECTOR
LNA VEERF
VCO
XTAL 1 XTAL 2
LF
Fig. 2. Block diagram
VCO 1 VCO 2
1 page  
KESRX01
Bit slicer and Peak Detector
To provide maximum flexibility an independent data
comparator is provided. External circuitry must be provided to
obtain the bit slicer threshold level. Two basic approaches are
supported.
1. For coding schemes with no d.c. content (e.g. Manchester
coding or 33% / 66% pulse width encoding) this can be based
on the integrated d.c. level (using a series R and C). See
Application Note AN207.
2. For coding schemes with d.c. content (e.g. low duty cycle
pulse width modulation) an active peak detector is included.
The output at pin PEAK represents the peak level at the data
filter output (as shown in Fig.5). An external RC time constant
at this pin determines the maximum attack and decay times of
the peak detector. Typical values for the leakage and diode
current source capability are shown in the specifications. The
comparator has relatively low drive capability (push/pull
current source output of 20µA) and hence DATOP should not
be excessively loaded. On chip positive feedback around the
comparator provides a nominal hysteresis level of 20mV.
INTERNAL CIRCUIT
––
+
+
PEAK
PEAK LEVEL OUTPUT
Fig. 5 Peak detector output
Sensitivity
In digital radio systems, sensitivity is often defined as the
lowest signal level at the receiver input that will achieve a
specified Bit Error Ratio (BER) at the output. The sensitivity of
the KESRX01 receiver, when used in the 434MHz application
shown in Fig. 6, is typically –103dBm average power (ASK
modulated with 2kHz, 50% duty cycle square wave) to achieve
a 0.01 BER. The input was matched for a 50Ω signal source.
At 315MHz, –105dBm average power is typically achievable.
Consult the Applications Notes refered to at the end of this
Datasheet for detailed PCB design issues to secure
perfomance.
Choice of IF frequency and IF bandwidth
The IF frequency is selected to be nominally 270KHz with
the low frequency cut-off at 25KHz and the high frequency
cut-off at 550KHz (nominal). For worst case tolerances the
transmitter frequency may be 433.92MHz ± 100KHz. i.e from
433.82MHz to 434.02MHz (see transmitter design
specification application notes)
The local oscillator frequency is set at 433.65MHz with a
required accuracy of at least ± 100kHz (see section below) i.e
433.55MHz to 433.75MHz.
This guarantees that the IF (70KHz to 470KHz) falls within
the acceptance bandwidth of the IF filter.
The frequency of operation for such products in Europe is
433.05MHz to 434.79MHz. The choice of such a low IF
frequency ensures that any image falls within the regulatory
band. This in turn ensures that the receiver cannot be blocked
by the image response of an unwanted signal outside of this
band.
Frequency Accuracy
The stability of the local oscillator is equal to that of the
crystal reference oscillator. Therefore to obtain a final output
accuracy of ± 100KHz at 433MHz would require a crystal with
a tolerance specification of ± 230ppm. This tolerance should
encompass all causes e.g. initial accuracy, temperature
stability and ageing. Choose a tighter tolerance crystal for
increased frequency accuracy.
5
5 Page 
For more information about all Zarlink products
visit our Web Site at
www.zarlink.com
Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries (collectively “Zarlink”) is believed to be reliable.
However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such
information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or
use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual
property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in
certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink.
This publication is issued to provide information only and (unless agreed by Zarlink in writing) may not be used, applied or reproduced for any purpose nor form part
of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other
information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the
capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute
any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user’s responsibility to fully determine the performance and
suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does
not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in
significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink’s conditions of sale which are available on request.
Purchase of Zarlink’s I2C components conveys a licence under the Philips I2C Patent rights to use these components in and I2C System, provided that the system
conforms to the I2C Standard Specification as defined by Philips.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright Zarlink Semiconductor Inc. All Rights Reserved.
TECHNICAL DOCUMENTATION - NOT FOR RESALE
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet KESRX01.PDF ] | |
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