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SL6649-1
3115 - 4.1
SL6649-1
200MHz DIRECT CONVERSION FSK DATA RECEIVER
The SL6649-1 is a low power direct conversion radio receiver for the reception of frequency shift keyed transmissions. It features the capability of 'power down' for battery conservation. The device also includes a low battery flag indicator.
FEATURES
I Very Low Power Operation - typ. 3.7mW I Single Cell Operation with External Inverter I Complete Radio Receiver in One Package I Operation up to 200MHz I 100nV Typical Sensitivity I Operates up to 1200 BPS I On Chip Tunable Active Filters I Minimum External Component Count I Low Power Down Current Typical 5A
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DESCRIPTION
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
MP28
PIN 28 27 26 25 24 23 22 21 20 19 18 17 16 15 DESCRIPTION CHANNEL B TEST. LO INPUT CHANNEL B LO INPUT CHANNEL A VCC1 (MIXER) MIXER I/P A MIXER I/P B CHANNEL A TEST LO CURRENT SOURCE RFA II (EMIT) RF DEC RFA II (BASE) RF INPUT RF DEC RF O/P COLPITTS OSC O/P DISABLE NC
APPLICATIONS
I Low Power Radio Data Receiver I Wristwatch Credit Card Pager I Radio Paging I Ultrasonic Direction Indication I Security Systems I Remote Control Systems
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Storage Temperature Operating Temperature 6V -55C to +150C -20C to +70C
GND BATTERY ECON GYRATOR CURRT ADJ REF VOLTAGE BANDGAP REF VOLT VCC2 BIT RATE FILTER DATA OUTPUT GND NC NC NC BATT FLAG INPUT BATT FLAG OUTPUT
N.B. It is advisable to connect NC pins to ground.
Figure 1: Pin Connections - Top View
ORDERING INFORMATION
SL6649-I/KG/MPES - Small outline (MP28) supplied in tubes SL6649-1/KG/MPEF - Small outline (MP28) supplied in tape & reel
1
SL6649-1
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated). Tamb = 25C, VCC1 = 2.5V, VCC2 = 3.5V Value Characteristic Supply Voltage VCC1 Supply Voltage VCC2 Supply Current lCC1 Supply Current ICC2 Power Down lCC1 Power Down lCC2 Bandgap Reference Voltage Reference RF Amplifier Supply Current (IRF) Power Down Mixers Gain to "IF Test" Pin 25 6,16 17, 25, 26, 27 6,16 17, 21, 25, 26, 27 6,16 5 4 Min VR 1.8 Typ 1.3 2.3 1.6 0.65 5 3 1.22 1.0 Max 2.8 3.5 2.0 0.80 12 12 1.35 1.13 Units V V mA mA A A V V Conditions VCC1 (VCC2)-0.7
(IRF) Included Batt Econ Low Batt Econ Low
1.15 0.93
17 17
430
535
640
A A
Included in Power Down ICC1
32
38
dB
L.O. inputs driven in parallel with 50mV RMS @ 50MHz. IF = 2kHz
Oscillator Current Source Power Down Decoder Sensitivity
21 21
215
270
330
A A
Included in Power Down lCC1
40
Vrms
Signal injected at "IF TEST" B.E.R. 1 in 30 5kHz deviation @ 500 bits/sec BRF capacitor = 1nF
Output Mark Space Ratio Output Logic High Output Logic Low Battery Economy Input Logic High Input Logic Low Input Current Battery Flag Output High Level Output Low Level Flag trig Level Colpitts Oscillator Frequency
8 8
7:9 85
9:7 15 %VCC2 %VCC2
2 2
(VCC2)-0.3 0.05 0.3 1
V V A
Powered Up Powered Down
14 14 13
85 VR-25mV 15 VR+25mV
%VCC2 %VCC2 V
Battery Low RL > 1M Battery High RL > 1 M Voltage Reference (VR) pin 4
15 15
kHz kHz
R=90K, pin 3 to GND R=360K, pin 3 to GND
2
SL6649-1
TYPICAL ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed by design. Tamb = 25C, VCC1 = 2.5V, VCC2 = 3.5V Value Characteristic RF Amplifier Noise Figure Power Gain Input Impedance Mixer RF Input Impedance LO Input Impedance LO DC Bias Voltage Detector Output Current Colpitts Oscillator Frequency Output Voltage Pin Min Typ 5.5 14 19 23, 24 26, 27 26, 27 7 4 Max Units dB dB Conditions RS = 50 See Fig. 8 See Figs. 9 (a) and (b) See Fig. 10 Equal to pin 25
V A
16 16
15 20
kHz mVp-p
R = 270K, Pin 3 to GND RL >> 1M N.B. Refer to Channel Filter Fig. 4
RECEIVER CHARACTERISTICS (GPS DEMONSTRATION BOARD)
Measurement conditions (unless otherwise stated): Applications circuit diagram Fig.6; VCC1 = 1.3V; VCC2 = 2.3V; Tamb = 25C; Colpitts oscillator resistor = 270k; mixer input A and B phase balance = 180; local oscillator input A and B phase balance = 90. Measurement methods as described by CEPT Res 2 specification. FIN = 153MHz (512 baud). Value Characteristic Terminal Sensitivity Tone only 4/5 call reception Deviation Acceptance Centre Frequency Acceptance Adjacent Channel Rejection Adjacent + 1 Channel Rejection Third Order Intermod adj-1 + adj-2 2.0 65 65 52 Min Typ -127 2.5 2.5 70 70 53 Max -124 Units dBm kHz kHz dB dB dB Conditions f = 4.5kHz, RS = 50 3dB De-Sensitisation. FIN = FLO f = 4.5kHz
Figure 2: Block Diagram of SL6649-1 Direct Conversion Receiver

f = 4.5kHz Channel Spacing 25kHz External capacitors on test pins A and B.
3
SL6649-1
PRINCIPLE OF OPERATION
The incoming signal is split into two parts and frequency converted to baseband. The two paths are produced in phase quadrature (see Fig 2) and detected in a phase detector which provides a digital output. The quadrature network must be in the local oscillator path. At a data rate of 512 baud and a deviation frequency of 4.5kHz, the input to the system has a demodulation index of 18. This gives a spectrum as in Fig 3. f1 and f0 represent the `steady state' frequencies (i.e. modulated with continuous `1' and `0' respectively). The spectrum in Fig 3 is for reversals (a 0-1-0-1-0-1 etc. pattern) at the system bit rate; fC is the nominal carrier frequency). When the LO is at the nominal carrier frequency, then a continuous `0' or `1' will produce an audio frequency, at the output of the mixers corresponding to the difference between f0 and fC or f1 and fC. If the LO is precisely at fc, then the resultant output signal will be at the same frequency regardless of the data state; nevertheless, the relative phases of the two paths will reverse between `0' and `1' states. By applying the amplified outputs of the mixers to a phase discriminator, the digital data is reproduced.
Figure 3: Spectrum Diagram
TUNING THE CHANNEL FILTERS
The adjacent channel rejection performance of the SL6649-1 receiver is determined by the channel filters. To obtain optimum adjacent channel rejection, the channel filters' cut off frequency should be set to 8kHz. The process tolerances are such that the cut off frequency cannot be accurately defined, hence the channel filters must be tuned. However the receiver characteristics on the previous page can be achieved with a fixed 270k resistor between pin 3 and GND. Tuning is performed by adjusting the current in the gyrator circuits. This changes the values of the gyrator's equivalent inductance. The cut off frequency is tuned to 8kHz. To accurately define the cut off of the channel filters, a gyrator based Colpitts oscillator circuit has been included on the SL6649-1. The Colpitts oscillator and channel filters use the same type of architecture, hence there is a direct correlation between oscillator frequency and cut off frequency. By knowing the Colpitts oscillator frequency the channel filter cut off frequency can be estimated from Figure 4. Once the channel filters have been tuned it may be necessary to disable the Colpitts oscillator. The Colpitts oscillator is disabled by connecting the Colpitts oscillator output/disable pin (pin # 16) to VCC2. This is needed since the Colpitts oscillator may impair the performance of the receiver.
k
k
Figure 4
k
Figure 5: Channel Filter Response
4
SL6649-1
5
Figure 6: Block Diagram and Applications Circuit (for component values see next page)
SL6649-1
COMPONENTS LIST FOR FIGURE 6
Capacitors C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 1nF 1nF 1nF 5.6pF 1nF 2.2F 1nF 1nF 2.2F 2.2F C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 1nF 1nF 10pF 1nF 10pF 1nF 5.6pF 4.7pF 1nF 1nF Resistors R1 R2 R4 R5 R6 R7 R8 2.2k 500k Variable 100 100 100 100 100K Inductors L1 L2 L3 L4 10H 220nH 150nH 100nH Transformers T1 1:1 Transformer Primary/Secondary Inductance=200nH Miscellaneous IC1 SL6649-1 TR1 SOT-23 Transistor with f 1.3GHz (EG. ZETEX BFS 17) X1 153MHz 7th overtone crystal VC2 1.5-10pF
Figure 7: Pinning Diagram of the SL6649-1
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SL6649-1
FREQ MHz 100.000 150.000 200.000 250.000 300.000 350.000 400.000 450.000 500.000 550.000 600.000
S11 MAG. 0.963 0.949 0.934 0.906 0.876 0.846 0.816 0.781 0.746 0.700 0.655 ANG. -15.971 -21.603 -27.247 -33.835 -40.519 -45.789 -50.979 -58.616 -66.363 -72.624 -78.856
S12 MAG. 0.016 0.017 0.017 0.021 0.025 0.029 0.032 0.039 0.045 0.062 0.079 ANG. 120.281 121.732 123.174 124.612 126.042 139.335 153.381 163.051 172.537 165.197 157.518
S22 MAG. 1.036 0.991 0.946 0.938 0.934 0.925 0.915 0.872 0.827 0.771 0.716 ANG. -3.440 -5.524 -7.608 -10.156 -12.744 -14.380 -15.955 -18.015 -20.094 -19.691 -19.231
S21 MAG. 1.460 1.390 1.321 1.261 1.201 1.132 1.061 0.986 0.910 0.854 0.798 ANG. 157.948 142.732 127.508 115.531 103.830 95.446 87.270 78.111 68.910 65.157 61.518
Figure 8: RF Amplifier
7
SL6649-1
S11 FREQ. 100.000 150.000 200.000 250.000 300.000 350.000 400.000 450.000 500.000 550.000 600.000 MAG. 0.943 0.929 0.914 0.904 0.895 0.866 0.836 0.796 0.756 0.726 0.696 ANG. -14.921 -21.059 -27.208 -35.234 -43.439 -52.138 -60.882 -68.177 -75.417 -82.654 -89.883
Figure 9a: SL6649-1 Mixer RF input pin 23
S11 FREQ. 100.000 150.000 200.000 250.000 300.000 350.000 400.000 450.000 500.000 550.000 600.000 MAG. 0.963 0.953 0.944 0.930 0.915 0.891 0.866 0.846 0.826 0.806 0.786 ANG. -10.019 -15.143 -20.277 -20.764 -20.853 -30.479 -40.734 -46.135 -51.344 -57.057 -62.785
Figure 9b: SL6649-1 Mixer RF input pin 24
S11 FREQ. 100.000 150.000 200.000 250.000 300.000 350.000 400.000 450.000 500.000 550.000 600.000 MAG. 0.993 0.983 0.974 0.960 0.945 0.954 0.946 0.927 0.907 0.877 0.847 ANG. -11.020 -16.144 -21.277 -27.820 -34.499 -39.765 -44.952 -52.586 -60.331 -67.086 -73.819
Figure 10: SL6649-1 Mixer LO input pins 26 and 27
8
SL6649-1
METHOD FOR THE MEASUREMENT OF SENSITIVITY ON THE SL6649-1 RECEIVER
The method used by GEC Plessey Semiconductors in the measurement of terminal sensitivity is essentially the same as that described in the CEPT Res 2 Specification. This method requires the following equipment: 1. A signal generator e.g. HP8640 2. A pocsag encoder 3. A pocsag decoder e.g. MV6639 4. An SL6649-1 Demo Board. 5. An interference free low impedance P.S.U. (VCC1 and VCC2 must be separate supplies and there must be at least 0.7V difference between them). Recommended supply configurations are shown in Fig. 13. The test equipment and D.U.T. are set up as shown in Figure 11. The R.F. frequency is set to the nominal L.O. frequency of the receiver and the peak deviation is set to 4.5kHz. Care must be taken to avoid long power supply leads and any ground loops. Any interference from the decoder will be reduced by the insertion of a high value resistor R1 (100K) between the receiver data output and the decoder input.
Figure 11: Test System
The generator output level is reduced successively until the decoder responds just 4 out of 5 times to the encoder signal. This output level is then recorded as the sensitivity threshold of the receiver. We find that this threshold correlates to a bit error rate of 1 in 30. The data output waveforms for an input level which produces a B.E.R. of 1 in 30 and for input levels 2dB above and below this level, are shown below (square wave input). It can be seen that the edge jitter increases dramatically at signal levels below the sensitivity threshold of -127dBm. Typical waveforms that can be seen on an oscilloscope around the sensitivity threshold level are shown in Figure 12. NB. In performing the sensitivity measurement great care should be taken in preventing coupling between test leads.
Figure 12: Waveform at Data O/P
9
SL6649-1
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 MNEMONIC GND BEC Gl Vr BG Vc2 BR DO GND FUNCTION Ground Battery Economy Gyrator Current Adjust Reference Voltage Bandgap Reference Voltage VCC 2 Bit rate Filter Data Output Ground UNC UNC UNC Battery Flag Input Battery Flag Output PIN 15 16 17 18 19 20 21 22 23 24 25 26 27 28 MNEMONIC CO RO RDA Rl RDB Ol TA MA MB VCIM OA OB TB FUNCTION UNC Colpitts Oscillator Output/Disable RFA I (collector) RF Output RFA I (base) RF Decouple RFA II (base) RF Input RFA II (emitter) RF Decouple LO Current Source Channel A Test Mixer l/P B Mixer l/P A VCC1 (mixer) LO Input Channel A LO Input Channel B Channel B Test
Fl FO
POWER SUPPLIES
(c) should be regarded as a test set up only.
Figure 13(a): SL6649-1 Power Supply Options
10
SL6649-1
PAGER APPLICATION EXAMPLE
A typical 1 volt pager system suitable as a wrist watch application is shown in Figure 13 (b). Only 3 integrated circuits are required to perform all the functions of a tone only pager. These are SL6649-1 direct conversion radio receiver and the MV6639 POCSAG decoder plus a 1 volt E2PROM (eg. Seiko Epson SPM28C51). The SL6649-1 receives and demodulates the data, and monitors the battery voltage. The interface between the decoder and receiver consists of only 3 connections excluding the supplies. The MV6639 performs all the functions required for a POCSAG decoder for tone only and/or pager messaging at 512 or 1200 baud. A 32kHz watch crystal is used as the reference frequency for the decoder. The decoder voltage doubler output VCC2 is available to power not only the receiver, but an alternative higher voltage E2PROM and microprocessor/LCD driver for a full tone and message pager.
Figure 13(b): Tone Pager Applications Example Showing Interface with SL6649-1 Receiver
OPERATION AT OTHER FREQUENCIES AND DATA RATES
The values given in the components list for figure 6 are appropriate for frequencies nominally around 153MHz. In order to use the receiver at other frequencies it is necessary to change the capacitor C4 which is resonant with the transformer T1, and L2 and L4 in the oscillator circuit. It is also necessary to change the values of capacitors C13 and C15 such that the reactance of these is equal to 100 at the required frequency. It is of course necessary to use a crystal of the required frequency and stability. In order to use the receiver at higher data rates it is only necessary to reduce the value of C8, for example, at 1200bps, C8=470pf. A demonstration board has been designed specifically to demonstrate terminal sensitivity. It is possible to connect an antenna to the board with suitable matching but no guarantee can be given regarding field strength sensitivity. However, with a suitably designed combination of PCB and antenna, a sensitivity of 5V/M should be attainable.
11
SL6649-1
PACKAGE DETAILS
Dimensions are shown thus: mm (in). For further package information, please contact your local Customer Service Centre.
0-8
28
SPOT REF. CHAMFER REF.
1
10*00/10*64 7*40/7*60 (0*291/0*299) (0*394/0*419)
0*25/0*71 (0*010/0*028) x45
0*41/1*27 (0*016/0*050)
0*36/0*48 (0*014/0*019)
0*23/0*33 (0*009/0*013) 2*36/2*64 (0*093/0*104)
0*74 (0*029) MAX.
28 LEADS AT 1*27 (0*050) NOM. SPACING 17*70/18*10 (0*697/0*713)
0*10/0*30 (0*004/0*012)
NOTES 1. Controlling dimensions are inches. 2. This package outline diagram is for guidance only. Please contact your GPS Customer Service Centre for further information.
28-LEAD MINIATURE PLASTIC DIL - MP28
HEADQUARTERS OPERATIONS GEC PLESSEY SEMICONDUCTORS Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (01793) 518000 Fax: (01793) 518411 GEC PLESSEY SEMICONDUCTORS P.O. Box 660017 1500 Green Hills Road, Scotts Valley, California 95067-0017, United States of America. Tel: (408) 438 2900 Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES * FRANCE & BENELUX Les Ulis Cedex Tel: (1) 69 18 90 00 Fax : (1) 64 46 06 07 * GERMANY Munich Tel: (089) 3609 06-0 Fax : (089) 3609 06-55 * ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993 * JAPAN Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510 * NORTH AMERICA Scotts Valley, USA Tel (408) 438 2900 Fax: (408) 438 7023. * SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 * SWEDEN Stockholm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 * TAIWAN, ROC Taipei Tel: 886 2 5461260. Fax: 886 2 7190260 * UK, EIRE, DENMARK, FINLAND & NORWAY Swindon Tel: (01793) 518527/518566 Fax : (01793) 518582 These are supported by Agents and Distributors in major countries world-wide. (c) GEC Plessey Semiconductors 1995 Publication No. 3115 Issue No. 4.0 September 1995 TECHNICAL DOCUMENTATION - NOT FOR RESALE. PRINTED IN UNITED KINGDOM.
This publication is issued to provide information only which (unless agreed by the Company 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. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company reserves the right to alter without prior notice the specification, design or price 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. 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 the Company's conditions of sale, which are available on request.
12
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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

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