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obsolescence notice this product is obsolete.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
features low power consumption (1.5ma) single chip solution guaranteed 100mhz operation exceptionally stable rssi applications cellular radio telephones cordless telephones quick reference data supply voltage 2.5v to 7 5v sensitivity 3 m v co-channel rejection 7db 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. fig. 1 pin connections (top view) dp20 dg20 mp20 fig. 2 block diagram ds 3285 -1 vcc 33p 270p 33k 33k 1n 8p2 10 20 - 40p 0v 220n vcc vcc 330p 39k 10p oscillator input 200mv rms rfc mixer input 3? 1n 10n 10k 100n +1.2v load resistor 1.5k ceramic filter 220n 1.5k (to match filter) 220n 10n 100n rssi 1k 270p 270p audio outputs 100mv rms (3khz deviation) detector 1? 3 4 11 rssi 200k 12 13 14 200k if amp 20k 10 9 8 bias 7 20 19 +15db (adjustable) 100mhz max 8? 2k 8? 1k mixer cbe oscillator transistor 0v SL6652 +90db (lighting) 1.5mhz max 50? 40k 40k 2 1 5 6 15 16 17 18 x1 8p2 SL6652 is for maintenance purposes only and is not recommended for new designs
SL6652 absolute maximum ratings supply voltage 8v storage temperature -55 c to +150 c operating temperature -55 c to +125 c mixer input 1v rms electrical characteristics test conditions (unless otherwise stated): v cc = 2.5v to 7.5v, t amb = -30 c to +85 c, if = 455khz, rf = 50mhz, quad coil working q = 30 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. typ. 1.5 5 3 40 1.2 7 1 2 5 15 -10 500 90 1500 20 60 0.5 40 65 1.22 min. 1.0 180 100 40 30 455 75 50 0.9 70 value characteristics units conditions overall supply current sensitivity am rejection v bias 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 h fe f t if amplifier gain frequency diff. input impedance detector audio output level ultimate s/n ratio thd output impedance inter-output isolation rssi output (t amb = +25 c) output current output current current change linear dynamic range max. 2.0 10 1.4 300 70 125 5 20 80 1.5 ma m v m v db v db kohm kohm m a db dbm mv mhz m a mhz db khz kohm mv db % kohm db m a m a m a/db db 20db sinad 12db sinad rf input <500 m v t amb = 25 c see note 2 at v bias rload = 1.5k t amb = 25 c 40 ... 70 m a 40 ... 70 m a 5mv into pin 14 1khz no input pin 14 pin 14 = 2.5mv see note 1 see note 1
SL6652 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: l a mixer stage for use up to loomhz l an uncommitted transistor for use as an oscillator l a current sink for biasing this transistor l a limiting amplifier operating up to 1.5mhz l a quadrature detector with differential af output l an rssi (received signal strength indicator) output mixer 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 300 m a. 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. oscillator the oscillator consists of an uncommitted transistor and a separate current sink. the user should ensure that the design 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 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. detector 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. 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. 18 16 17 15 9 20 10 19 7 4k 13 14 12 200k 200k 11 5 6 8 3 band-gap reference 4 2 1 40k 40k bias
SL6652 supply voltage the SL6652 will operate reliably from 2.5v to 7.5v the supply line must be decoupled with 470nf using short leads. detector 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 (t amb = 20 c) fig. 11 rssi output vs input level and temperature (v cc = 2.5v) fig. 12 rssi output vs input level and temperature (t cc = 5v) fig. 13 rssi output vs input level and temperature (v cc = 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 (v cc = 5v)
SL6652 fig. 17 circuit diagram of SL6652 application circuit murata ceramic filter fl1 cfw 455e rssi c11 0.1 c10 10n r6 1.5k c13 0.22 c12 0.22 22p 2-20p 10 r7 1.5k x1 r8 33k c15 1n 8p2 8p2 r9 33k c14 33p c16 270p l2 4.7 rfc c17 10n r10 10k c19 100n c2 10p r1 39k l1 c1 330p c3 270p c5 1n c6 10n r5 1.5k c4 270p r2 1k r3 1k c7 0.47 c18 10n c8 22n c9 22n af af rf i/p r4 56r v cc 20 19 18 17 16 15 14 13 12 11 123 45678910 SL6652 l1 330 to 480 m h q = 75 at 455khz l2 250 - 410nh q = 100 at 50mhz x1 50mhz 3rd o/t series res.
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 regard ing 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, w hich are available on request.
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 t he 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, u nder 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 intellect ual 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 re produced 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, t heir 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 t o 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 b een 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 conditi ons of sale which are available on request. purchase of zarlink?s i 2 c components conveys a licence under the philips i 2 c patent rights to use these components in and i 2 c system, provided that the system conforms to the i 2 c 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 for more information about all zarlink products visit our web site at

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