NJM2760 Band Pass Filter for Spectrum Analyzer Display GENERAL DESCRIPTION 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. PACKAGE OUTLINE NJM2760V 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 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. IN1 IN2 BUF1OUT BPF2IN1 BPF2IN2 BPF3IN1 BPF3IN2 BPF4IN1 BPF4IN2 GND 20. BUF2OUT 19. BPF1IN2 18. BPF1IN1 17. RECOUT 16. BPF1OUT 15. BPF2OUT 14. BPF3OUT 13. BPF4OUT 12. N.C. 11. V+ BLOCK DIAGRAM 5.6k 10k 22nF V+ 6.8k 47nF BPF 4.7nF BPF4 out DET 1F 1F BPF BPF3 out DET 1F 200k L in R in 200k BPF BPF2 out DET 1F 1F BPF BPF1 out DET 1F 200k 200k REC out DET 1F 1F GND 470pF -1- NJM2760 ABSOLUTE MAXIMUM RATING (Ta=25C) PARAMETER SYMBOL + RATINGS UNIT 14 V Supply Voltage V Power Dissipation PD 300 mW Operating Temperature Range Topr -20 to +75 C Storage Temperature Range Tstg -40 to +125 C ELECTRICAL CHARACTERISTICS (Ta=25C, V+=3.3V, VIN=1VPEAK unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT - 2.7 3.3 9.0 V - 1.4 3.0 mA 0.7 1.0 1.42 V 2.1 3.0 - V Power Supply + Operating Voltage V Operating Current Icc No Signal AC CHARACTERISTICS Typical Output Voltage VOT Maximum Output Voltage VOM Vin=1Vpeak, f=Center Frequency of BPF Vin=3Vpeak, f=Center Frequency of BPF BPF1 Center Frequency Level GVBPF1 f=8kHz -3 0 +3 dB BPF2 Center Frequency Level GVBPF2 f=1.2kHz -3 0 +3 dB BPF3 Center Frequency Level GVBPF3 f=300Hz -3 0 +3 dB BPF4 Center Frequency Level GVBPF4 f=80Hz -3 0 +3 dB No Signal - 5 30 mV DC Offset Voltage VOS TEST CIRCUIT C1 1F R2 100k C2 1F IN1 IN2 1 IN1 2 IN2 3 BUF1OUT 4 BPF2IN1 5 BPF2IN2 6 BPF3IN1 7 BPF3IN2 8 BPF4IN1 9 BPF4IN2 10 GND C3 4.7nF R3 6.8k C4 4.7nF C5 22nF R4 5.6k C6 22nF C7 47nF R5 10k C8 47nF NJM2760 R1 100k BUF2OUT 20 BPF1IN2 19 BPF1IN1 18 RECOUT 17 C14 1F RECOUT BPF1OUT 16 C13 1F BPF1OUT BPF2OUT 15 C12 1F BPF2OUT BPF3OUT 14 C11 1F BPF3OUT BPF4OUT 13 C10 1F BPF4OUT NC 12 V+ 11 C16 470pF C15 470pF + -2- C9 1F V+ NJM2760 TERMINAL DESCRIPTION No. SYMBOL FUNCTION 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 3 20 BUF1OUT BUF2OUT Buffer output Buffer output 4 6 8 18 BPF2IN1 BPF3IN1 BPF4IN1 BPF1IN1 Capacitor terminal for BPF2 Capacitor terminal for BPF3 Capacitor terminal for BPF4 Capacitor terminal for BPF1 13 14 15 16 17 BPF4OUT BPF3OUT BPF2OUT BPF1OUT RECOUT BPF4 output BPF3 output BPF2 output BPF1 output Recording level detector output EQUIVALENT CIRCUIT 1.4V 680 FB VOLTAGE 680 1.4V 1.4V 680 0V 90k FB 30k 10 GND Ground terminal - 11 V+ Power supply terminal - -3- NJM2760 APPLICATION CIRCUIT LIN RIN R11 200k R12 200k R21 200k 1 IN1 2 IN2 C2 1F 3 BUF1OUT 4 BPF2IN1 5 BPF2IN2 6 BPF3IN1 7 BPF3IN2 8 BPF4IN1 9 BPF4IN2 10 GND C3 4.7nF R3 6.8k C4 4.7nF C5 22nF R4 5.6k C6 22nF C7 47nF R5 10k C8 47nF NJM2760 R22 200k C1 1F BUF2OUT 20 BPF1IN2 19 C16 470pF C15 470pF BPF1IN1 18 RECOUT 17 C14 1F RECOUT BPF1OUT 16 C13 1F BPF1OUT BPF2OUT 15 C12 1F BPF2OUT BPF3OUT 14 C11 1F BPF3OUT BPF4OUT 13 C10 1F BPF4OUT NC 12 V+ 11 + -4- C9 1F V+ NJM2760 APPLICATION NOTE 1. Center Frequency Setting for Band Pass Filters Band pass filters equivalent circuits as follows. External Circuit Internal Circuit External Circuit Internal Circuit C C Rb Rb to Detector C Ra Ra to Detector C from Input Buffer Fig.1-a. BPF1's Equivalent Circuit from Input Buffer Fig.1-b. BPF2-4 's Equivalent Circuit Center Frequency (fo) can be formulated as follows. Table 1. Center frequency setting example f0 = 2Q 2CR b [Hz], Q=2 BPF1 (8kHz) BPF2 (1.2kHz) BPF3 (300Hz) BPF4 (80Hz) Ra ) 10 k* 6.8 k 5.6 k 10 k Rb ) 169 k* ) 113 k* ) 96.5 k* ) 169 k* C 470pF 4.7nF 22nF 47nF *) 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. R [k] Vout[ Vdc ] = Gv = 2 100[k] Vin[ Vpeak ] -5- NJM2760 TYPICAL CHARACTERISTICS Supply Current vs. Temperature V+=3.3V 3 3 2.5 2.5 2 2 25,75C Icc[mA] Icc[mA] Supply Current vs. Supply Voltage Ta=-40, 25, 75C 1.5 1 1.5 1 Ta=-20C 0.5 0.5 0 0 0 1 2 3 4 5 6 7 8 9 10 -50 -30 -10 10 Vcc[V] 8 RECout R2=80k 7 Vos [mV] Vout[VDC] 110 130 150 9 RECout R2=100k 2.5 2 1.5 RECout R2=120k 1 6 5 RECout BPF1out BPF2out 4 3 2 0.5 BPF3out BPF4out 1 0 0 0 0.5 1 1.5 2 2.5 3 Output vs. Frequency V+=3.3V, Vin=1VPEAK 5 75C BPF4 BPF3 BPF2 BPF1 25C -20C -10 -15 -20 -25 -30 10 100 1000 f[Hz] -50 0 50 Ta[C] Vin[VPEAK] Vout[dB] 90 10 3 -6- 70 DC Offset Voltage vs. Temperature V+=3.3V 3.5 -5 50 Ta[C] INPUT vs. OUTPUT Vcc=3.3V, Ta=25C, f=8kHz, R2=R21/ /R22 0 30 10000 100000 100 150 NJM2760 TYPICAL CHARACTERISTICS Input vs. Output Level V+=3.3V, Vout=BPFout1, fo=8kHz Input vs. Output Level V+=3.3V, Vout=BPFout2, fo=1.2kHz 4 4 3 3 75C 75C 25C Vout[VDC] Vout[VDC] 25C -20C 2 1 2 -20C 1 0 0 0 0.5 1 1.5 2 2.5 3 0 0.5 1 Vin[VPEAK] 1.5 2 3 Vin[VPEAK] Input vs. Output Level V+=3.3V, Vout=BPF3out, fo=300Hz Input vs. Output Level V+=3.3V, Vout=BPF4out, fo=80Hz 4 4 75C 75C 3 3 25 25C Vout[VDC] Vout[VDC] 2.5 2 -20 1 2 -20C 1 0 0 0 0.5 1 1.5 2 2.5 3 Vin[VPEAK] 0 0.5 1 1.5 Vin[VPEAK] 2 2.5 3 Input vs. Output Level V+=3.3V, Vout=RECout, fo=8kHz 4 75C 3 Vout[VDC] 25C 2 -20C 1 0 0 0.5 1 1.5 2 2.5 3 [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. Vin[VPEAK] -7- Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: NJR: NJM2760V-TE2