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SL521 150mhz wideband log amplifier the SL521a, b and c are bipolar monolithic integrated circuit wideband amplifiers, intended primarily for use in successive detection logarithmic if strips, operating at centre frequencies between 10mhz and 100mhz the devices provide amplification, limiting and rectification, are suitable for direct coupling and incorporate supply line decoupling the mid-band voltage gain of the SL521 is typically12db(4times) the SL521a, b and c differ mainly in the tolerance of voltage gain and upper cut-off frequency the device is also available as the 5962-90792 which has guaranteed operation over the full military temperature range and is screened to mil-std-883 class b. data is available separately features n wide defined gain n 4db noise figure n hlgh i/p impedance n low o/pi mpedance n 165mhz bandwidth n on chip supply decoupling n low external component count ordering information SL521 a cm 5962-90792 (smd) SL521 b cm SL521 c cm absolute maximum ratings (non-simultaneous) storage temperature range -65 c to +150 c operating temperature range -55 c to +125 c chip operating temperature +175 c chip-to-ambient thermal resistance 225 c/w chip-to-case thermal resistance 65 c/w maximum instantaneous voltage at video output +12v supply voltage +9v applications n logarithmic if strips wlth gains up to 108db and linearity better than 1db fig.1 pin connections - bottom view cm8 fig.2 circuit diagram SL521 ds3606 - 2.0 advance information
SL521 electrical characteristics these characteristics are guaranteed over the following conditions (unless otherwise stated) temperature = +22 c + 2 c supply voltage = +6v dc connection between input and bias pins. min. typ. max. voltage gain, f = 30mhz a 11.5 12.5 db b 11 .3 1 2.7 db c 11.0 13.0 db 10 ohms source, 8pf load voltage gain, f = 60mhz a 11.3 12.7 db b 11.0 13.0 db c 10.7 13.3 db upper cut-off frequency (fig. 3) a 150 170 mhz b 140 170 mhz 10 ohms source, 8pf load c 130 170 mhz lower cut-off frequency (fig. 3) a b c 5 7 mhz 10 ohms source, 8pf load propagation delay a b c 2 ns maximum rectified video output a 1.00 1.10 ma current (fig. 4 and 5) b 0.95 1.15 ma f = 60mhz, 0.5v rms input c 0.90 1.20 ma variation of gain with supply voltage a b c 0.7 db/v variation of maximum rectified a b c 25 %/v output current with supply voltage maximum input signal before overload a b c 1.8 1.9 v rms see note below noise figure (fig. 6) 4 5.25 db f = 60mhz, rs = 450 ohms supply current a 12.5 15.0 18.0 ma b 12.5 15.0 18.0 ma c 11.5 15.0 19.0 ma maxiumum rf output voltage 1.2 vp-p value units conditions circuits characteristic note: overload occurs when the input signal reaches a level sufficient to forward bias the base-collector junction to tr2 on p eaks. fig.3 voltage gain v. frequency (typical) fig.4 rectified output current v. input signal (typical)
SL521 fig.5 maximum rectified output current v. temperature (typical) fig.6 noise figure v. temperature (typical) fig.7 input admittance with open-circuit output (typical) fig.8 direct coupled amplifiers fig.9 suitable interstagetuned circuit operating notes the amplifiers are intended for use directly coupled, as shown in fig 8. the seventh stage in an untuned cascade will be giving virtually full output on noise. noise may be reduced by inserting a single tuned circuit in the chain as there is a large mismatch between stages a simple shunt or series circuit cannot be used the choice of network is also controlled by the need to avoid distorting the logarithmic law; the network must give unity voltage transfer at resonance a suitable network is shown in fig 9. the value of c1 must be chosen so that at resonance its admittance equals the total loss conductance across the tuned circuit resistor r1 may be introduced to improve the symmetry of filter response, providing other values are adjusted for unity galn at resonance. a simple capacitor may not be suitable for decoupling the output line if many stages and fast rise times are required. alternative arrangements may be derived, based on the parasitic parameters given. values of positive supply line decoupling capacitor requlred for untuned cascades are given below. smaller values can be used in high frequency tuned cascades. number of stages 6 or more 5 4 3 minimum capacitance 30nf 10nf 3nf lnf the amplifiers have been provided with two earth leads to avoid the introduction of common ground lead inductance between input and output circuits. the equipment designer should take care to avoid the subsequent introduction of such inductance. the 500pf supply decoupling capacitor has a resistance of, typically, 1 0q. it is a junction type having a low breakdown voltage and consequently the positive supply current will increase rapidly if the supply voltage exceeds 7.5v (see absolute maximum ratings).
SL521 current from pin 2 voltage at pin 6 = = 0.003 effective voltage induced at pin 6 voltage at pin 4 = = 20 mmhos parasitic feedback parameters (approximate) the quotation of these parameters does not indicate that elaborate decoupling arrangements are required, the amplifier has been designed specifically to avoid this requirement. the parameters have been given so that the necessity or otherwise of further decoupling, may become a matter of calculation rather than guesswork. i 4 v 6 ~ rf current component from pin 4 voltage at pin 6 (this figure allows for detector being forward biased by noise signals). v 4 v 6 = = 6 mmhos (f = 10mhz) i 2 v 6 v 6 v 2 a voltage induced at pin 6 voltage at pin 2 = = 0.03 (f = 10mhz) voltage at pin 2 (pin joined to pin 7 and fed from 300 w source) voltage induced at pin 6 voltage at pin 2 v 6 v 2 b = = 0.01 (f = 10mhz) voltage at pin 2 (pin 7 decoupled) i 2 v 6 v 6 v 2 b v 6 v 2 a decrease with frequency above 10mhz at 6db/octave 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 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. customer service centres france & benelux les ulis cedex tel: (1) 64 46 23 45 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 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
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