NJM2760V

NJM2760 Band Pass Filter for Spectrum Analyzer Display s 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. s PACKAGE OUTLINE NJM2760V s FEATURES q Operating Voltage +2.7V to +9V q 4 Band Pass Filters & Detector q Recording Level Indicator Output q Low Offset Voltage 5mV typ. q Adjustable Input Sensitivity q Bipolar Technology q Package Outline SSOP20 s PIN CONFIGURATION 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 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+ s BLOCK DIAGRAM 5.6k Ω 10k Ω 6.8k Ω 22nF 47nF 4.7nF V+ 1µF BPF DET 1µF BPF4 out BPF 200k Ω DET 1µF BPF3 out L in R in 200k Ω BPF 1µF DET 1µF BPF2 out BPF 200k Ω 200k Ω 1µF DET 1µF BPF1 out DET 1µF REC out GND 470pF –1– NJM2760 s ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V + RATINGS 14 300 -20 to +75 -40 to +125 UNIT V mW °C °C PD Topr Tstg s ELECTRICAL CHARACTERISTICS (Ta=25°C, V+=3.3V, VIN=1VPEAK unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT xPower Supply Operating Voltage Operating Current V + No Signal Vin=1Vpeak, f=Center Frequency of BPF Vin=3Vpeak, f=Center Frequency of BPF f=8kHz f=1.2kHz f=300Hz f=80Hz No Signal 2.7 - 3.3 1.4 9.0 3.0 V mA Icc x AC CHARACTERISTICS Typical Output Voltage Maximum Output Voltage BPF1 Center Frequency Level BPF2 Center Frequency Level BPF3 Center Frequency Level BPF4 Center Frequency Level DC Offset Voltage VOT VOM GVBPF1 GVBPF2 GVBPF3 GVBPF4 VOS 0.7 2.1 -3 -3 -3 -3 1.0 3.0 0 0 0 0 5 1.42 +3 +3 +3 +3 30 V V dB dB dB dB mV x TEST CIRCUIT R1 100kΩ IN1 R2 100kΩ IN2 C2 1µF 2 3 C3 4.7nF R3 6.8kΩ C4 4.7nF 5 C5 22nF R4 5.6kΩ C6 22nF 7 C7 47nF R5 10kΩ C8 47nF 9 10 BPF4IN2 GND 8 BPF4IN1 BPF3IN2 6 BPF3IN1 BPF2IN2 4 BPF2IN1 IN2 BUF1OUT C1 1µF 1 IN1 BUF2OUT 20 C16 470pF BPF1IN2 BPF1IN1 RECOUT BPF1OUT BPF2OUT BPF3OUT BPF4OUT NC V+ 19 C15 470pF 18 17 16 15 14 13 12 11 RECOUT BPF1OUT BPF2OUT BPF3OUT BPF4OUT NJM2760 C14 1µF C13 1µF C12 1µF C11 1µF C10 1µF + C9 1µF V+ –2– NJM2760 s 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 680Ω 1.4V 3 20 BUF1OUT BUF2OUT Buffer output Buffer output FB 680Ω 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 680Ω 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 90kΩ FB 30kΩ 10 GND Ground terminal - 11 V+ Power supply terminal - –3– NJM2760 s APPLICATION CIRCUIT LIN RIN R11 200kΩ R12 200kΩ R21 200kΩ R22 200kΩ C1 1µF 1 C2 1µF 2 3 C3 4.7nF IN2 BUF1OUT BPF2IN1 BPF2IN2 BPF3IN1 BPF3IN2 BPF4IN1 BPF4IN2 GND IN1 BUF2OUT 20 C16 470pF BPF1IN2 BPF1IN1 RECOUT BPF1OUT BPF2OUT BPF3OUT BPF4OUT NC V+ 19 C15 470pF 18 17 16 15 14 13 12 11 RECOUT BPF1OUT BPF2OUT BPF3OUT BPF4OUT NJM2760 R3 6.8kΩ C4 4.7nF 4 5 C5 22nF C14 1µF C13 1µF C12 1µF C11 1µF C10 1µF R4 5.6kΩ C6 22nF 6 7 C7 47nF R5 10kΩ C8 47nF 8 9 10 + C9 1µF V+ –4– NJM2760 s 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 Rb C to Detector C Rb Ra C to Detector Ra from Input Buffer from Input Buffer Fig.1-a. BPF1's Equivalent Circuit Fig.1-b. BPF2-4 's Equivalent Circuit Center Frequency (fo) can be formulated as follows. Table 1. Center frequency setting example f0 = 2Q 2πCR b [Hz], Q=2 BPF1 (8kHz) BPF2 (1.2kHz) BPF3 (300Hz) BPF4 (80Hz) Ra ) 10 kΩ* 6.8 kΩ 5.6 kΩ 10 kΩ Rb ) 169 kΩ* ) 113 kΩ* ) 96.5 kΩ* ) 169 kΩ* 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 [kΩ] Vout[ Vdc ] = Gv = 2 100[kΩ] Vin[ Vpeak ] –5– NJM2760 s TYPICAL CHARACTERISTICS Supply Current vs. Supply Voltage Ta=-40, 25, 75°C 3 2.5 2 Icc[mA] 3 2.5 2 Supply Current vs. Temperature V+=3.3V Icc[mA] 25,75°C 1.5 1 0.5 0 0 1 2 3 4 5 Vcc[V] INPUT vs. OUTPUT Vcc=3.3V, Ta=25°C, f=8kHz, R2=R21/ /R22 3.5 3 2.5 RECout R2=80kΩ RECout R2=100kΩ 1.5 1 0.5 0 Ta=-20°C 6 7 8 9 10 -50 -30 -10 10 30 50 Ta[°C] 70 90 110 130 150 DC Offset Voltage vs. Temperature V+=3.3V 10 9 8 7 Vos [mV] Vout[VDC] 2 1.5 1 0.5 0 0 0.5 1 1.5 Vin[VPEAK] 2 2.5 3 RECout R2=120kΩ 6 5 4 3 2 1 0 -50 0 RECout BPF1out BPF2out BPF3out BPF4out 50 Ta[°C] 100 150 Output vs. Frequency V+=3.3V, Vin=1VPEAK 5 0 -5 75°C 25°C -20°C BPF4 BPF3 BPF2 BPF1 Vout[dB] -10 -15 -20 -25 -30 10 100 1000 f[Hz] 10000 100000 –6– NJM2760 s TYPICAL CHARACTERISTICS Input vs. Output Level V+=3.3V, Vout=BPFout1, fo=8kHz 4 Input vs. Output Level V+=3.3V, Vout=BPFout2, fo=1.2kHz 4 75°C 3 25°C 75°C 3 25°C -20°C Vout[VDC] 2 Vout[VDC] 2 -20°C 1 1 0 0 0.5 1 1.5 Vin[VPEAK] 2 2.5 3 0 0 0.5 1 1.5 Vin[VPEAK] 2 2.5 3 Input vs. Output Level V+=3.3V, Vout=BPF3out, fo=300Hz 4 75°C 3 25℃ Vout[VDC] Input vs. Output Level V+=3.3V, Vout=BPF4out, fo=80Hz 4 75°C 3 25°C Vout[VDC] 2 -20° 1 2 -20°C 1 0 0 0.5 1 1.5 Vin[VPEAK] Input vs. Output Level V+=3.3V, Vout=RECout, fo=8kHz 4 2 2.5 3 0 0 0.5 1 1.5 Vin[VPEAK] 2 2.5 3 3 25°C Vout[VDC] 75°C 2 -20°C 1 [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. 0 0 0.5 1 1.5 Vin[VPEAK] 2 2.5 3 –7–