NJM2760 ? 1 ? band pass filter for spectrum analyzer display general description package outline the NJM2760 is a band pass filter for spectrum analyzer display. it includes 4-band bpf amplifier, 4-band detector and recording level indicator output. it is suitable for mini-components, cd radio cassette and other audio components. features operating voltage +2.7v to +9v 4 band pass filters & detector recording level indicator output low offset voltage 5mv typ. adjustable input sensitivity bipolar technology package outline ssop20 pin configuration block diagram NJM2760v l in r in rec ou t bpf2 ou t bpf3 ou t bpf4 ou t bpf1 ou t bpf bpf bpf det det det det det gnd v+ bpf 200k ? 200k ? 200k ? 200k ? 5.6k ? 10k ? 6.8k ? 22nf 47nf 4.7nf 470pf 1f 1f 1f 1f 1f 1f 1f 1f 4 6 5 1 2 3 7 8 10 9 14 13 16 15 18 17 20 19 12 11 1. in1 20. buf2out 2. in2 19. bpf1in2 3. buf1out 18. bpf1in1 4. bpf2in1 17. recout 5. bpf2in2 16. bpf1out 6. bpf3in1 15. bpf2out 7. bpf3in2 14. bpf3out 8. bpf4in1 13. bpf4out 9. bpf4in2 12. n.c. 10. gnd 11. v+
NJM2760 ? 2 ? absolute maximum rating (ta=25 c) parameter symbol ratings unit supply voltage v + 14 v power dissipation p d 300 mw operating temperature range topr -20 to +75 c storage temperature range tstg -40 to +125 c electrical characteristics (ta=25 c, v+=3.3v, v in =1v peak unless otherwise specified) parameter symbol test condition min. typ. max. unit power supply operating voltage v + - 2.7 3.3 9.0 v operating current icc no signal - 1.4 3.0 ma ac characteristics typical output voltage v ot vin=1v peak , f=center frequency of bpf 0.7 1.0 1.42 v maximum output voltage v om vin=3v peak , f=center frequency of bpf 2.1 3.0 - v bpf1 center frequency level g vbpf1 f=8khz -3 0 +3 db bpf2 center frequency level g vbpf2 f=1.2khz -3 0 +3 db bpf3 center frequency level g vbpf3 f=300hz -3 0 +3 db bpf4 center frequency level g vbpf4 f=80hz -3 0 +3 db dc offset voltage v os no signal - 5 30 mv test circuit c1 1 f 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 19 18 17 13 20 NJM2760 in1 in2 buf1out bpf2in1 bpf2in2 bpf3in2 bpf4in1 buf2out bpf1in2 bpf1in1 recout bpf2out bpf1out bpf3out nc v + bpf3in1 bpf4out gnd bpf4in2 + c9 1 f v+ c2 1 f r1 100k ? r2 100k ? r3 6.8k ? r4 5.6k ? r5 10k ? c3 4.7nf c4 4.7nf c5 22nf c6 22nf c7 47nf c8 47nf c10 1 f c11 1 f c12 1 f c13 1 f c14 1 f c15 470pf c16 470pf recout bpf2out bpf1out bpf3out bpf4out in1 in2
NJM2760 ? 3 ? terminal description no. symbol function equivalent circuit voltage 1 2 5 7 9 19 in1 in2 bpf2in2 bpf3in2 bpf4in2 bpf1in2 input for bpf1-4 input for recording level detector capacitor terminal for bpf2 capacitor terminal for bpf3 capacitor terminal for bpf4 capacitor terminal for bpf1 1.4v 3 20 buf1out buf2out buffer output buffer output 1.4v 4 6 8 18 bpf2in1 bpf3in1 bpf4in1 bpf1in1 capacitor terminal for bpf2 capacitor terminal for bpf3 capacitor terminal for bpf4 capacitor terminal for bpf1 1.4v 13 14 15 16 17 bpf4out bpf3out bpf2out bpf1out recout bpf4 output bpf3 output bpf2 output bpf1 output recording level detector output 0v 10 gnd ground terminal - 11 v+ power supply terminal - 680 ? 680 ? fb 680 ? fb 90k ? 30k ?
NJM2760 ? 4 ? application circuit c1 1 f 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 19 18 17 13 20 NJM2760 in1 in2 buf1out bpf2in1 bpf2in2 bpf3in2 bpf4in1 buf2out bpf1in2 bpf1in1 recout bpf2out bpf1out bpf3out nc v+ bpf3in1 bpf4out gnd bpf4in2 + c9 1 f v+ c2 1 f r11 200k ? r3 6.8k ? r4 5.6k ? r5 10k ? c3 4.7nf c4 4.7nf c5 22nf c6 22nf c7 47nf c8 47nf c10 1 f c11 1 f c12 1 f c13 1 f c14 1 f c15 470pf c16 470pf rec out bpf2out bpf1out bpf3out bpf4out lin rin r12 200k ? r21 200k ? r22 200k ?
NJM2760 ? 5 ? application note 1. center frequency setting for band pass filters band pass filters equivalent circuits as follows. center frequency (fo) can be formulated as follows. * ) as regards the bpf1, the values of ra and rb are fixed. also as regards the bpf2-4, the values of rb is fixed. 2. output gain setting for recout. output voltage of recout is adjustable by external resistor: r2 voltage gain (gv) is defined as follows. ra rb c bpf1 (8khz) 10 k ? * ) 169 k ? * ) 470pf bpf2 (1.2khz) 6.8 k ? 113 k ? * ) 4.7nf bpf3 (300hz) 5.6 k ? 96.5 k ? * ) 22nf bpf4 (80hz) 10 k ? 169 k ? * ) 47nf ra to detecto r rb c c internal circuit external circuit from input buffe r ra to detecto r rb c c internal circuit from input buffe r external circuit fig.1-a. bpf1's equivalent circuit fig.1-b. bpf2-4 's equivalent circuit table 1. center frequenc y settin g example b 0 cr 2 q 2 f = [hz], q=2 ] ? k [ 100 ] ? k [ r g ] vpeak [ vin ] vdc [ vout 2 v = =
NJM2760 ? 6 ? typical characteristics input vs. output vcc=3.3v, ta=25c, f=8khz, r2=r21/ /r22 0 0.5 1 1.5 2 2.5 3 3.5 00.511.522.53 vin[v peak ] vout[v dc ] recout r2=80k ? recout r2=120k ? recout r2=100k ? supply current vs. temperature v+=3 .3 v 0 0.5 1 1.5 2 2.5 3 -50-30-101030507090110130150 ta[c] icc[ma] supply current vs. supply voltage ta=-40, 25, 75c 0 0.5 1 1.5 2 2.5 3 012345678910 vcc[v] icc[ma] ta=-20c 25,75c dc offset voltage vs. temperature v+=3 .3 v 0 1 2 3 4 5 6 7 8 9 10 -50 0 50 100 150 ta[c] vos [mv] bpf3ou t bpf4ou t bpf1out bpf2out recout output vs. frequency v+=3 .3 v, vi n =1 vpeak -30 -25 -20 -15 -10 -5 0 5 10 100 1000 10000 100000 f[hz] vout[db] 25c -20c bpf4 bpf3 bpf2 bpf1 75c
NJM2760 ? 7 ? typical characteristics [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. input vs . output level v+=3 .3 v, vo u t=bpfo u t1 , fo =8 kh z 0 1 2 3 4 00.511.522.53 vi n [v peak ] vout[v dc ] -20c 25c 75c input vs. output level v+=3.3v, vout=bpfout2, fo=1.2khz 0 1 2 3 4 00.511.522.53 vi n [v peak ] vout[v dc ] 25c 75c -20c input vs. output level v+=3.3v, vout=bpf3out, fo=300hz 0 1 2 3 4 00.511.522.53 vi n [v peak ] vout[v dc ] 25 75c -20 input vs . output level v+=3.3v, vout=bpf4out, fo=80hz 0 1 2 3 4 00.511.522.53 vin [v peak ] vout[v dc ] 25c 75c -20c input vs. output level v+=3.3v, vout=recout, fo=8khz 0 1 2 3 4 00.511.522.53 vi n [v peak ] vout[v dc ] 25c 75c -20c
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