NJM2760
– 1 –
Band Pass Filter fo r 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
200kΩ
200kΩ
200kΩ
200kΩ
5.6kΩ10kΩ6.8kΩ
22nF 47nF 4.7nF
470pF
1µF
1µF
1µF
1µF
1µF
1µF
1µF
1µF
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 1µF
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
1µF
V+
C2 1µF
R1 100kΩ
R2 100kΩ
R3 6.8kΩ
R4 5.6kΩ
R5 10kΩ
C3 4.7nF
C4 4.7nF
C5 22nF
C6 22nF
C7 47nF
C8 47nF
C10 1µF
C11 1µF
C12 1µF
C13 1µF
C14 1µF
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
-
680Ω
680Ω
FB
680Ω
FB
90kΩ
30kΩ
NJM2760
– 4 –
■
■■
■ APPLICATION CIRCUIT
C1 1µF
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
1µF
V+
C2 1µF
R11 200kΩ
R3 6.8kΩ
R4 5.6kΩ
R5 10kΩ
C3 4.7nF
C4 4.7nF
C5 22nF
C6 22nF
C7 47nF
C8 47nF
C10 1µF
C11 1µF
C12 1µF
C13 1µF
C14 1µF
C15 470pF
C16 470pF
RECOUT
BPF2OUT
BPF1OUT
BPF3OUT
BPF4OUT
LIN
RIN R12 200kΩ
R21 200kΩ
R22 200kΩ
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 kΩ*
)
169 kΩ*
)
470pF
BPF2 (1.2kHz) 6.8 kΩ 113 kΩ*
)
4.7nF
BPF3 (300Hz) 5.6 kΩ 96.5 kΩ*
)
22nF
BPF4 (80Hz) 10 kΩ 169 kΩ*
)
47nF
Ra
to Detecto
r
Rb
C
C
Internal CircuitExternal 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
CRπ2
Q2
f=
[Hz], Q=2
]Ωk[100
]Ωk[R
G
]Vpeak[Vin
]Vdc[Vout
2
v
==
NJM2760
– 6 –
■
■■
■ TYPICAL CHARACTERISTICS
INPUT vs. OUTPUT
Vcc=3.3V, Ta=25°C, f=8kHz, R2=R21/ /R22
0
0.5
1
1.5
2
2.5
3
3.5
00.511.522.53
Vin[VPEAK]
Vout[V
DC]
RECout
R2=80kΩ
RECout
R2=120kΩ
RECout
R2=100kΩ
Supply Current vs. Temperature
V+=3.3V
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, 75°C
0
0.5
1
1.5
2
2.5
3
012345678910
Vcc[V]
Icc[mA]
Ta=-20°C
25,75°C
DC Offset Voltage vs. Temperature
V+=3.3V
0
1
2
3
4
5
6
7
8
9
10
-50 0 50 100 150
Ta[°C]
Vos [mV]
BPF3ou
BPF4ou
BPF1out
BPF2out
RECout
Output vs. Frequency
V+=3.3 V, Vin =1 VPEAK
-30
-25
-20
-15
-10
-5
0
5
10 100 1000 10000 100000
f[Hz]
Vout[dB]
25°C
-20°C
BPF4 BPF3 BPF2 BPF1
75°C
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+=3.3V, Vo u t=BPFo u t1 , fo=8 kHz
0
1
2
3
4
00.511.522.53
Vin [V
PEAK
]
Vout[V
DC
]
-20°C
25°C
75°C
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
]
25°C
75°C
-20°C
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℃
75°C
-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
]
25°C
75°C
-20°C
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
]
25°C
75°C
-20°C
Mouser Electronics
Authorized Distributor
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NJM2760V-TE2