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2471-3.1 the SL6659 is a complete single chip mixer, 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 25v to 75v. features n low power consumption (15ma) n single chip solution n guaranteed 200mhz operation n exceptionally stable rssi applications n cellular radio telephones n cordless telephones ordering information SL6659 na mp ?miniature plastic dil package SL6659 na mptd - as above, supplied on tape and reel fig. 1 pin connections top view SL6659 low power if/af circuit (with rssi) for fm radio fig. 2 block diagram mp16 quick reference data n supply voltage: 25v to 75v n sensitivity: 3v n co-channel rejection: 7db
2 SL6659 absolute maximum ratings supply voltage 8v storage temperature 2 55c to 1 150c mixer input 1vrms note: this device has static sensitive inputs, sensitivity typically measured as 500v using mil-std-883 method 3015. therefore, esd handling precautions are essential to avoid degradation of performance or permanent damage of this device. electrical characteristics the characteristics are guaranteed over the following condltions, unless otherwise stated: v cc = 2?v to 7?v, t amb = 2 30c to 1 85c, if = 455khz, rf = 50mhz, quad coil working q = 30 typ. max. min. value characteristic units conditions 20db sinad 12db sinad rf input , 500v t amb = 25c see note 2 at v bias r load = 1.5k w 5mv into pin 13 no input pin13 pin 13 = 25mv see note 1 see note 1 1? 180 200 455 75 50 0? 70 1? 5 3 40 1? 7 1 2 5 15 2 10 90 1500 20 60 0? 40 1?2 2? 1? 300 125 5 25 80 1? ma ? ? db v db k w k w ? db dbm mv mhz db khz k w mv db % k w ? ? ?/db db overall supply current sensitivity am rejection v bias co-channel rejection mixer rf input impedance lo input impedance lo input bias mixer gain 3rd order input intercept lo input level lo frequency if amplifier gain frequency differential input impedance detector audio output level ultimate s/n ratio thd output impedance rssi output (t amb = 1 25c) output current current change linear dynamic range notes 1. the rssi output is 100% dynamically tested at 5v and 1 20c over a 70db range. first the input to pin 13 is set to 25mv and the rssi current recorded. then for each step of 10db from 2 40 to 1 30db, the current is measured. 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, 1khz modulated signal at an input level to give a 20db sinad ratio. then a 3khz deviation 400hz modulated slgnal on the same frequency is also applied and its level increased to degrade the sinad to 14db.
3 SL6659 fig. 3 internal schematic general description the SL6659 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 200mhz l a limiting amplifier operating up to 15mhz l a quadrature detector with 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 300a. the lo input is differential but would normally be driven single-ended. special care should be taken to avoid acciden- tal overload of the local oscillator input. if amplifier the limiting amplifier is capable of operation to at least 1mhz and the input impedance is set by an external resistor to match the ceramic filter. because of the high gain, pins 11 and 12 must be adequately bypassed. detector a conventional quadrature detector providing audio output is fed internally from the if amplifier; the quadrature input is fed externally using an appropriate capacitor and phase shift network. rssi output the rssi output is a current source with value proportional to the logarithm of the if 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. supply voltage the SL6659 will operate reliably trom 25v to 75v. the supply line must be decoupled with 470nf using short leads. internal bias voltage 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 typically 14 w ..
4 SL6659 fig. 6 freehand 3.11 20/5/94 18:08 fig. 7 audio output v. input and supply voltage at 1 25c fig. 6 audio output v. input and temperature at 7?v fig. 4 audio output v. input and temperature at 2?v fig. 5 audio output v. input and temperature at 5?v fig. 8 sinad v. input level fig. 9 am rejection and input level fig. 9 freehand 3.11 20/5/94 18:09
5 SL6659 fig. 10 rssi output v. input and supply voltage (t amb = 20c) fig. 11 rssi output v. input and temperature (v cc = 25v) fig. 10 freehand 3.11 20/5/94 18:11 fig. 11 freehand 3.11 20/5/94 18:13 fig. 12 rssi output v. input level and temperature (v cc = 5v) fig. 13 rssi output v. input level and temperature (v cc = 75v) fig. 12 freehand 3.11 20/5/94 18:14 fig. 13 freehand 3.11 20/5/94 18:15
6 SL6659 fig. 17 circuit diagram of SL6659 demonstration board fig. 14 (signal 1 noise) to noise ratio v. input level fig. 15 supply current v. supply voltage fig. 16 supply current v. temperature
7 SL6659 fig. 18 track side of demonstration board. scale = 2:1. fig. 19 ground plane side of demonstration board. scale = 2:1.
8 SL6659 fig. 21 demonstration board connectors and through-board component overlay (ground plane side). scale = 2:1. fig. 20 demonstration board surface mount component overlay (track side). scale = 2:1.
9 SL6659 component list r1 51 w r2 * 1k w r3 1?k w r4 10k w r5 1?k w r6 33k w c1 100nf c2 10nf c3 10nf c4 10pf c5 330pf c6 1nf c7 270pf c8 470nf c9 10nf c10 100nf c11 220nf * c12 220nf * c13 220nf l1 * 330h (adjustable), cambion type 553-7107-43 rfc * 4?h f1 * murata type cfw 445 e components marked thus: * are through-board mounted from the ground plane side; all other components are surface mounted on the track side. see figs. 20 and 21. resistors capacitors inductors filter
10 SL6659 notes
11 SL6659 notes
12 SL6659 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, ca95067-0017 united states of america. tel (408) 438 2900 fax: (408) 438 5576 customer service centres l france & benelux les ulis cedex tel: (1) 64 46 23 45 fax : (1) 64 46 06 07 l germany munich tel: (089) 3609 06-0 fax : (089) 3609 06-55 l italy milan tel: (02) 66040867 fax: (02) 66040993 l japan tokyo tel: (3) 5276-5501 fax: (3) 5276-5510 l north america scotts valley, usa tel: (408) 438 2900 fax: (408) 438 7023. l south east asia singapore tel: (65) 3827708 fax: (65) 3828872 l sweden stockholm tel: 46 8 702 97 70 fax: 46 8 640 47 36 l taiwan, roc taipei tel: 886 2 5461260 fax: 886 2 7190260 l uk, eire, denmark, finland & norway swindon tel: (0793) 518510 fax : (0793) 518582 these are supported by agents and distributors in major countries world-wide. gec plessey semiconductors 1994 publication no. ds2471 issue no. 3.1 june 1994 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 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. package details dimensions are shown thus: mm (in).
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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