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PDF NJM2760 Data sheet ( Hoja de datos )
| Número de pieza | NJM2760 | |
| Descripción | Band Pass Filter | |
| Fabricantes | JRC | |
| Logotipo |  |
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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 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 PACKAGE OUTLINE
NJM2760V
s PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
s BLOCK DIAGRAM
20
19 1. IN1
18 2. IN2
17 3. BUF1OUT
16 4. BPF2IN1
15 5. BPF2IN2
14 6. BPF3IN1
7. BPF3IN2
13 8. BPF4IN1
12 9. BPF4IN2
11 10. GND
5.6kΩ 10kΩ 6.8kΩ
22nF 47nF 4.7nF
V+
1µF
L in
R in
200kΩ
200kΩ
1µF
200kΩ
200kΩ
1µF
GND
BPF
BPF
BPF
BPF
DET
DET
DET
DET
DET
470pF
20. BUF2OUT
19. BPF1IN2
18. BPF1IN1
17. RECOUT
16. BPF1OUT
15. BPF2OUT
14. BPF3OUT
13. BPF4OUT
12. N.C.
11. V+
BPF4 out
1µF
BPF3 out
1µF
BPF2 out
1µF
BPF1 out
1µF
REC out
1µF
–1–
1 page  
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s APPLICATION NOTE
1. Center Frequency Setting for Band Pass Filters
Band pass filters equivalent circuits as follows.
External Circuit
C
C
Internal Circuit
Rb
to Detector
from Input Buffer
Ra
NJM2760
External Circuit
C
Ra C
Internal Circuit
Rb
to Detector
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.
f0
=
2Q
2πCRb
[Hz], Q=2
Table 1. Center frequency setting example
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.
Vout[Vdc]
Vin[Vpeak]
= Gv
=
R2 [kΩ]
100[kΩ]
–5–
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NJM2760.PDF ] | |
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