Obsolescence Notice This product is obsolete. This information is available for your convenience only. For more information on Zarlink’s obsolete products and replacement product lists, please visit http://products.zarlink.com/obsolete_products/ THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS SL6652 IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS DS 3285 -1 SL6652 LOWER POWER IF/AF CIRCUIT (WITH RSSI) FOR FM CELLULAR RADIO The SL6652 is a complete single chip mixer/oscillator, IF amplifier and detector for FM cellular radio, cordless telephones and low power radio applications. It features an exceptionally stable RSSI (Received Signal Strength Indicator) output using a unique system of detection. Supply current is less than 2mA from a supply voltage in the range 2.5V to 7.5V. FEATURES Low Power Consumption (1.5mA) Single Chip Solution Guaranteed 100MHz Operation Exceptionally Stable RSSI APPLICATIONS DP20 DG20 MP20 Cellular Radio Telephones Cordless Telephones QUICK REFERENCE DATA Fig. 1 Pin connections (top view) Supply Voltage 2.5V to 7 5V Sensitivity 3µV Co-Channel Rejection 7dB VCC VCC 20 - 40p 1n 33p 33k 270p VCC 10µ 39k 0V X1 33k 220n 8p2 10p 8p2 18 OSCILLATOR INPUT 200mV RMS C 17 B 16 15 50µA 6 5 1 DETECTOR 1n 7 40k SL6652 270p +90dB (LIGHTING) 1.5MHz MAX MIXER 11 RSSI IF AMP 20k 200k 1k 10k 10n 1k RSSI 10n BIAS 8 AUDIO OUTPUTS 270p 8µA MIXER INPUT 3µV 100mV RMS (3kHz DEVIATION) 4 +15dB (ADJUSTABLE) 100MHz MAX 19 8µA 20 3 40k 0V 2k 2 1µA E OSCILLATOR TRANSISTOR RFC 330p 200k 9 10 +1.2V 1.5k 100n LOAD RESISTOR 14 13 12 220n CERAMIC FILTER 220n Fig. 2 block diagram 1.5k (TO MATCH FILTER) 100n SL6652 ABSOLUTE MAXIMUM RATINGS Supply voltage Storage temperature Operating temperature Mixer input 8V -55°C to +150°C -55°C to +125°C 1V rms ELECTRICAL CHARACTERISTICS Test conditions (unless otherwise stated): VCC = 2.5V to 7.5V, Tamb = -30°C to +85°C, IF = 455kHz, RF = 50MHz, Quad Coil Working Q = 30 Value Characteristics Units Min. Overall Supply current Sensitivity AM rejection Vbias Co-channel rejection Mixer RF input impedance OSC input impedance OSC input bias Mixer gain 3rd order input intercept OSC input level OSC frequency Oscillator Current sink Hfe fT IF Amplifier Gain Frequency Diff. input impedance Detector Audio output level Ultimate S/N ratio THD Output impedance Inter-output isolation RSSI Output (Tamb = +25°C) Output current Output current Current change Linear dynamic range 1.0 Typ. Max. 1.5 5 3 40 1.2 7 2.0 10 1.4 1 2 5 15 -10 180 100 300 40 30 70 455 kohm kohm µA dB dBm mV MHz µA 500 MHz 90 1500 20 dB kHz kohm 75 125 60 0.5 40 65 50 0.9 70 mA µV µV dB V dB 1.22 5 20 80 1.5 Conditions 20dB SINAD 12dB SINAD RF input <500µV Tamb = 25°C See Note 2 At Vbias Rload = 1.5k Tamb = 25°C 40 ... 70µA 40 ... 70µA mV dB % kohm dB 1kHz µA µA µA/dB dB No input pin 14 Pin 14 = 2.5mV See Note 1 See Note 1 5mV into pin 14 NOTES 1. The RSSI output is 100% dynamically tested at 5V and +20° C over a 70dB range. First the input to pin 14 is set to 2.5mV and the RSSI current recorded Then for each step of 10dB from -40 to +30dB the current is measured again. The current change in each step must meet the specified figure for current change. The RSSI output is guaranteed monotonic and free from discontinuities over this range. 2. Co-channel rejection is measured by applying a 3kHz deviation, 1 kHz modulated signal at an input level to give a 20dB SINAD ratio. Then a 3kHz deviation, 400Hz modulated signal on the same frequency is also applied and its level increased to degrade the SINAD to 14dB. SL6652 5 18 200k 17 9 10 20 19 13 16 11 14 15 12 4k 200k 7 8 BAND-GAP REFERENCE 6 2 3 4 BIAS 1 40k 40k Fig. 3 Internal schematic GENERAL DESCRIPTION The SL6652 is a very low power, high performance integrated circuit intended for IF amplification and demodulation in FM radio receivers. It comprises: of oscillator is suitable for the type of crystal and frequency required; it may not always be adequate to duplicate the design shown in this data sheet. ● ● ● ● ● ● IF amplifier A mixer stage for use up to lOOMHz An uncommitted transistor for use as an oscillator A current sink for biasing this transistor A limiting amplifier operating up to 1.5MHz A quadrature detector with differential AF output An RSSI (Received Signal Strength Indicator) output The limiting amplifier is capable of operation to at least 1 MHz and the input impedance is set by an external resistor to match the ceramic filter. Because of the high gain, pins 12 and 13 must be adequately bypassed. Mixer Detector The mixer is single balanced with an active load. Gain is set externally by the load resistor although the value is normally determined by that required for matching into the ceramic filter. It is possible to use a tuned circuit but an increase in mixer gain will result in a corresponding reduction of the mixer input intercept point. The RF input is a diode-biased transistor with a bias current of typically 300µA. The oscillator input is differential but would normally be driven single-ended. Special care should be taken to avoid accidental overload of the oscillator input. A conventional quadrature detector is fed internally from the IF amplifier; the quadrature input is fed externally using an appropriate capacitor and phase shift network. A differential output is provided to feed a comparator for digital use, although it can also be used to provide AFC. Oscillator The oscillator consists of an uncommitted transistor and a separate current sink. The user should ensure that the design RSSI output The RSSI output is a current source with value proportional to the logarithm of the IF input signal amplitude. There is a small residual current due to noise within the amplifier (and mixer) but beyond this point there is a measured and guaranteed 70dB dynamic range. The typical range extends to 92dB, independent of frequency, and with exceptionally good temperature and supply voltage stability. SL6652 Supply voltage Detector The SL6652 will operate reliably from 2.5V to 7.5V The supply line must be decoupled with 470nF using short leads. The internal band gap reference must be externally decoupled. It can be used as an external reference but must not be loaded heavily; the output impedance is tyically 14 ohms. Fig. 4 Audio output vs input and temperature at 2.5V Fig. 5 Audio output vs input and temperature at 5.0V Fig. 6 Audio output vs input and temperature at +7.5V Fig. 7 Audio output vs input and supply voltage at +25°C Fig. 8 SINAD and input level Fig. 9 AM rejection and input level SL6652 Fig. 10 RSSI output vs input and supply voltage (Tamb = 20°C) Fig. 12 RSSI output vs input level and temperature (TCC = 5V) Fig. 11 RSSI output vs input level and temperature (VCC = 2.5V) Fig. 13 RSSI output vs input level and temperature (VCC = 7.5V) SL6652 Fig. 14 Signal + noise to noise ratio vs input level Fig. 15 Supply current vs supply voltage Fig. 16 Supply current vs temperature (VCC = 5V) SL6652 C15 1n 22p R8 33k R9 33k 2-20p 10µ X1 C17 10n 4.7µ RFC L2 C14 33p R7 1.5K 8p2 C16 270p C13 0.22µ C12 0.22µ C10 10n C11 0.1µ RSSI 8p2 20 19 18 17 16 R10 10k 15 14 13 12 11 R6 1.5k FL1 CFW 455E SL6652 MURATA CERAMIC FILTER 1 C19 100n R1 39k 2 3 4 6 7 8 9 C3 270p C2 10p L1 5 10 R5 1.5k C5 1n C6 10n C4 270p C1 330p R2 1k C18 10n R3 1k C7 0.47µ C8 22n C9 22n VCC AF L1 330 to 480µH Q = 75 at 455kHz L2 250 - 410nH Q = 100 at 50MHz X1 50MHz 3rd O/T Series Res. R4 56R AF RF I/P Fig. 17 Circuit diagram of SL6652 application circuit SL6652 HEADQUARTERS OPERATIONS GEC PLESSEY SEMICONDUCTORS Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (0793) 518000 Fax: (0793) 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) 64 46 23 45 Tx: 602858F Fax : (1) 64 46 06 07 • GERMANY Munich Tel: (089) 3609 06-0 Tx: 523980 Fax : (089) 3609 06-55 • ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993 • JAPAN Tokyo Tel: (03) 3296-0281 Fax: (03) 3296-0228 • NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA Tel (408) 438 2900 Fax: (408) 438 7023. Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061. • SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 • SWEDEN Stockholm, Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 • UNITED KINGDOM & SCANDINAVIA Swindon Tel: (0793) 518510 Tx: 444410 Fax : (0793) 518582 These are supported by Agents and Distributors in major countries world-wide. GEC Plessey Semiconductors 1992 Publication No. DS3285 Issue No. 1.0 May 1992 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 knowledge 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. 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. 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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