general description the lr 4558 consists of two high performance opera- tional amplifiers. the ic f eatures high gain, high input resistance, excellent channel separation, wide range of operating voltage and inte rnal frequency compensa- tion. it can work with r 18v maximum power supply voltage. the lr 4558 is specifically suitable for applications in differential-in, differential-out as well as in potential- metric amplifiers and wher e gain and phase matched channels are mandatory. the lr 4558 is available in dip-8 or soic-8 package. features g internal frequency compensation g large dc voltage gain with 100 db typical g high input resistance with 5m : typical g maximum power su pply voltages: r 18v applications g audio ac-3 decoder system g audio amplifier soic-8 dip-8 leshan radio company, ltd. LR4558 pin configuration of lr 4558 (soic-8/dip-8) top view 8 v cc 7 output 2 6 input 2- 5 input 2+ 1 2 3 4 output 1 input 1- input 1+ v ee pin configuration m package/p package 1 / 7
functional block diagram representative schematic diagram of lr 4558 (each amplifier) - input + input 3.1 k : 7.1 k : 7.1 k : 87 pf 480 : 4.2 k : 36 k : : 10pf : : v ee output v cc leshan radio company, ltd. parameter symbol value unit power supply voltage v cc + 22 v v ee - 22 differential input voltage v id 18 v input voltage v ic 15 v absolute maximum ratings operating temperature range t op -40 to 85 o c storage temperature range t stg - 65 to 1 50 o c 2 / 7 LR4558
parameter conditions min typ max unit input offset voltage 2 6 .0 mv input bias current v cm =0v 30 500 na input offset current v cm =0v 5 200 na output voltage swing r l t 2k : r 10 r 13 v r l t 10k : r 12 r 14 supply current r l = f over full temperature range 3. 5 5. 6 ma large signal voltage gain r l < . v o (p-p) =1 0 v /-10 v 20 200 v/mv common mode rejection ratio rs<10k? 70 90 db power supply rejection ratio rs<10k? 76 90 d b electrical characteristics leshan radio company, ltd. figure 1. open loop voltage gain vs. frequency figure 2. maximum output voltage swing vs. frequency 2x10 0 hz 10 1 hz 10 2 hz 10 3 hz 10 4 hz 10 5 hz 10 6 hz 0 20 40 60 80 100 120 v cc =15v, v ee =-15v r l =2k,t a =25 o c open loop voltage gain (db) frequency (hz) 10 1 hz 10 2 hz 10 3 hz 10 4 hz 10 5 hz 10 6 hz 0 5 10 15 20 25 30 output voltage swing (v) frequency (hz) v cc =15v,v ee =-15v, r l =2k, t a =25 o c typical performance characteristics 3 / 7 LR4558
figure 3. maximum output voltage swing figure 4. equivalent input noise voltage vs. frequency vs. load resistance 0.1k 1k 10k 12 14 16 18 20 22 24 26 28 30 v cc =15v,v ee =-15v,t a =25 o c output voltage swing (v) load resistance (k : ) 10 0 hz 10 1 hz 10 2 hz 10 3 hz 10 0 10 1 10 2 10 3 frequency (hz) equivllent input noise voltage (nv/(hz) 0.5 ) v cc =15v, v ee =-15v r s =50 : ,t a =25 o c leshan radio company, ltd. figure 5. input offset voltage vs. temperature figure 6. input bias current vs. temperature -25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 v cc =15v v ee =-15v bias current (na) ambient temperature ( o c) -25 0 25 50 75 100 125 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 v cc =15v v ee =-15v offset voltage (mv) ambient temperature ( o c) typical performance characteristics (continued) 4 / 7 LR4558
typical application figure 7. application of lr 4558 in an ac/dc converter d2 d1 8 7 6 5 1 2 3 4 15k 20k 20k 10k v in v o 10 p f 20k 6.2k 20k - + - + lr 4558 leshan radio company, ltd. 5 / 7 LR4558
mechanical dimensions dip - 8 e e 5 f 0 , 1 0 $ ; f f f e e e f f ? h f unit: mm leshan radio company, ltd. 6 / 7 LR4558
soic - 8 mechanical dimensions (continued) e ' f e e e f e 5 5 f f f f ? f f f f e e e ' unit: mm leshan radio company, ltd. 7 / 7 LR4558
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