SL1610 GEC | Alldatasheet
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GEC PLESSEY - , ee SL1611 IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS $L1610, SL1611, SL1612 RF/IF AMPLIFIERS The SL1610C, SL1611C and SL1612C are AF voltage amplifiers with AGC facilities. The voltage gains are 10, 20 and §0 times respectively and the upper frequency res- ponse varies from 15 MHz to 120|MHz according to type. walt sh ve? $L1610 space cunrord]3 St 1649 & Panu eas FEATURES wravirife she I Wide AGC Range: 50dB @ Easy Interfacing ops Integral Pc ly RE li @ Integral Power Supply RF Decoupling Fia,1 Pinconnostions (op views APPLICATIONS ABSOLUTE MAXIMUM RATINGS @ RF Amplifiers Supply voltage: 12V 7 7 IF Ampiifiers Storage temperature: —55°C tol+|125°C
ORDERING INFORMATION
QUICK REFERENCE DATA $L1610/1/2 C DP Bieter Cn no) @ Voltage Gain: 2048 to 3448 bo o a Eo SuscePTance -~-| SCOTT ct en] sO veo Ke Eel eset eet a wage | mm 7 ect Cera r F) 1 (7 i Peg A i i Z AHHH EH ee H i a t—| rit HHhecoae Hee 1, i i NT TT streze [frerich | input o—tty—} 3 comur ESC at paaeekelnca tt
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(| ' as ee a ea | ! a} EIT Sat 1 a | | wneut? H POC ni BIAS t.--- 44 48g PO Cnr oi LEE (COT FREQUENCY (Mia) Fig. 2 Block diagram Fig. 3 Input admittance with o/c output (Gy 4)
ELECTRICAL CHARACTERISTICS . Test conditions (unless otherwise stated): ~ 7 Supply voltage Vcc: 6V ‘Ambient temperature: 30°C to +85°C Test frequency: 3L1610C 30MHz $L1611C 3OMHz SL1612C 1.75MHz ae om Fa] = ‘Supply current SL1610C 15 | 24 | ma SL16116 15 | 24 | mA | Nosignal, pin 3 open circuit . SL16126 a3] 6 | ma Voltage gain suiioc | 17 | 20] 26 | dB | Re=s0n siieiic| 23 | 26 | 30 | dB | AL =so0n sit612c | 31 | 34] 38 | dB | Tam =220 Cut-off frequency (-348) SL16106 120 MHz SL1611C 80 MHz SL16126 18 MHz Max.output signal (max.AGC) 10 Virms | AL = 1500 (SL1610C/1611C) RL = 1.2k9 (SL1612C) Max.input signal (maxAGC) 250 mV rms| AGC range si160c | 40 | 50 48 suteic | 40 | 50 48 | Pin7ovtos.1v stt612c | 60 | 70 4B AGC current 0.15] 06 | mA |Current into pin 7 at 5.1V APPLICATION NOTES acc Input circuit When pin 7 is open circuit or connected to a voltage less than 2V the voltage gain is normal. As the AGC voltage is ‘The SL1610C, SL1611C and SL1612C are normally used _ increased there is a reduction in gain as shown in Fig.6. This, with pins § and 6 connected together and with the input _ reduction varies with temperature. connected via a capacitor as shown in Fig. 2. ome and The input impedance is negative between iz ant t0oMHe (SL 18100. SL 161 1Gonly) ands shown in Fig. 3. ig A the source is inductive it should be shunted by a 1kQ re bape resistor to prevent oscillation. PINT HFRexsrance ——- Aer | An alternative input circuit with improved noise figure is eo | Sit neactance <= CTT | shown in Fig. 4. a a ao} — EC strepee | POSS dstieiacy i || oof Se L. A — EEA err a su ierie) S Tee er _| ° PAT | of — A | a 2.0 ZC PO rn} aot AC HH mane Aa Output circuit . ° i a || The output stage is an emitter follower and has a neg- a Et output impedance at certain frequencies as shown in COT) 4 7 i ‘To prevent oscillation when the loadis capacitive a470 FREQUENCY (MH) resistor should be connected in series with the output. Fig. § Typical output impedance with s/ input (G22) 1-138
The circuit of Fig. 7 is a general purpose RF preamplifier. The voltage gain (from pin 5 to pin 3) is shown in Fig. 8. Fig. 9 is the IF section of a simple SSB transceiver. At 9M2 it has a gain of 100dB. 7 FS ae EEOC PINS COCCCECCeee NN Ee ae ECE CCR ee ccOCcooooeeN Nr) FEN RC +
3 EECEECEPCE sie Naan | Fi
gee PEEP EE TT Nee Pcs -ooureur See neu ri on 2. CECE EEN COCEECEC Cee ec fe ECE CCE Cee er} CCCeCCeCee eee ye a EEEEEEE EERE CCCECEPCCeT Peer 0 a Cr ae SIGNAL Fig. 6 AGC characteristics (typical) Fig. 7 RF preamplifier °C _ ono) a Co a eeriipoee Hime Urn Pe ee 2° Cn NC ev 1 Cait] | pd . ae siiit nt Tat Es Leer oP tel Sc Pat tl seb faite sic PAP 5 | wou oureur eres CRN ja [lta Tbe! Coo io VI Co ac Corn oo) Fe aT 1 FREQUENCY (ite) Fig. 8 Typical voltage gain (Rs=50Q) Fig. 9 IF amplifier using SL1612