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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 10k 6.8k
22nF
47nF
4.7nF
V+
1F
BPF
DET
1F
BPF4 out
BPF
200k
DET
1F
BPF3 out
L in R in
200k
BPF
1F
DET
1F
BPF2 out
BPF
200k 200k 1F
DET
1F
BPF1 out
DET
1F
REC out
GND
470pF
-1-
NJM2760
s ABSOLUTE MAXIMUM RATING (Ta=25C)
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=25C, 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 100k IN1 R2 100k IN2 C2 1F 2 3 C3 4.7nF R3 6.8k C4 4.7nF 5 C5 22nF R4 5.6k C6 22nF 7 C7 47nF R5 10k C8 47nF 9 10 BPF4IN2 GND 8 BPF4IN1 BPF3IN2 6 BPF3IN1 BPF2IN2 4 BPF2IN1 IN2 BUF1OUT C1 1F 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 1F C13 1F C12 1F C11 1F C10 1F
+
C9 1F
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
680
1.4V
3 20
BUF1OUT BUF2OUT
Buffer output Buffer output
FB
680
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
680
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
90k FB 30k
10
GND
Ground terminal
-
11
V+
Power supply terminal
-
-3-
NJM2760
s APPLICATION CIRCUIT
LIN RIN
R11 200k R12 200k R21 200k R22 200k
C1 1F 1 C2 1F 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 6.8k C4 4.7nF
4 5 C5 22nF
C14 1F C13 1F C12 1F C11 1F C10 1F
R4 5.6k C6 22nF
6 7 C7 47nF
R5 10k C8 47nF
8 9 10
+
C9 1F
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 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
s TYPICAL CHARACTERISTICS
Supply Current vs. Supply Voltage Ta=-40, 25, 75C 3 2.5 2
Icc[mA]
3 2.5 2
Supply Current vs. Temperature V+=3.3V
Icc[mA]
25,75C 1.5 1 0.5 0 0 1 2 3 4 5 Vcc[V]
INPUT vs. OUTPUT Vcc=3.3V, Ta=25C, f=8kHz, R2=R21/ /R22 3.5 3 2.5 RECout R2=80k RECout R2=100k
1.5 1 0.5 0
Ta=-20C
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=120k
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 75C 25C -20C 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 75C
3 25C
75C
3 25C
-20C
Vout[VDC]
2
Vout[VDC]
2
-20C
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 75C 3 25
Vout[VDC]
Input vs. Output Level V+=3.3V, Vout=BPF4out, fo=80Hz 4 75C 3 25C
Vout[VDC]
2 -20 1
2 -20C 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 25C
Vout[VDC]
75C
2 -20C 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-

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