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PDF BA3826 Data sheet ( Hoja de datos )
| Número de pieza | BA3826 | |
| Descripción | Band-pass filter for spectrum analyzer | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Audio ICs
Band-pass filter for spectrum analyzer
BA3826S
The BA3826S is a 7-band ( 2), band-pass filter that uses microprocessor time division to output in serial to left and right
stereo channels. To minimize the number of external components required and enable compact and reliable designs,
all of the capacitors for the filters are on the chip.
FApplications
CD radio cassette players, mini-component stereo systems, car stereos
FFeatures
1) Seven band-pass filter elements for spectrum ana-
lyzer displays.
2) Microprocessor time division used for serial output
on L and R channels.
3) All filter capacitors are built-in to minimize external at-
tached requirements.
4) Low current dissipation (8mA Typ.).
5) Ideal for mini-component stereos and other stereo
equipment.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
576
1 page  
Audio ICs
BA3826S
(b) For DET, after release of RESET, there is a dis-
charge time of 14mS (Max.)
The read enable period for Vo starts 0.5ms after the out-
put switch logic settles.
(6) Output switch circuit
This circuit uses time division switching to output the
peak hold signal from each DET.
Switching occurs when the control signal reaches 1.4V,
and when A, B, and C are all high, output is disabled
(GND level). Refer to the table below regarding the out-
put switching logic.
The recommended output load resistance is 10kΩ.
(5) Application example with reduced cycle time
The transition characteristics for the band-pass filter are
shown in the graph below. The time for at least 5 fo cycles
is required until the DET output peaks. Therefore, the
lower the frequency, the longer the time required and fo1
requires the longest time. Refer to the values given below
for applications that require a shorter cycle time.
When fo1 = 60Hz, the time requires for output u 60% is
tg u 45ms.
580
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BA3826.PDF ] | |
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