BA3840KV [ROHM]
Preset graphic equalizer for headphone stereos; 预设图形均衡器的立体声耳机
| 型号： | BA3840KV |
| 厂家： | 
ROHM |
| 描述： | Preset graphic equalizer for headphone stereos |
| 文件： | 总8页 (文件大小：148K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Audio ICs
Preset graphic equalizer for
headphone stereos
BA3840KV
The BA3840KV is a preset graphic equalizer IC for headphone stereos. It combines two equalizer circuit channels on
a single chip, and also includes a dynamic sound leak reduction circuit.
FApplications
Headphone stereos
Portable CD players
FFeatures
1) Four sound quality settings are possible by DC con-
3) The sound leak reduction circuit can be turned on
and off by DC control.
trol.
2) High-frequency sounds can be cut off based on the
volume.
FBlock diagram
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Audio ICs
BA3840KV
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
FElectrical characteristics(unless otherwise noted, Ta = 25_C, VCC = 2V, f = 1kHz, VIN = 100mVrms,
F
flat position on, sound leak reduction circuit off)
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BA3840KV
FPin descriptions
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BA3840KV
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BA3840KV
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BA3840KV
FMeasurement circuit
FCircuit operation
(1) Preset graphic equalizer
(1) Flat position
(2) Sound leak reduction circuit
By pulling up the FLAT pin to VCC, frequency characteris-
tics become flat.
If the stereo output signal from the power amplifier is
mixed and input to the DET 1 pin and the PLSS pin pulled
up to VCC, the sound frequencies close to 5kHz that leak
easily will be cut off in accordance with the volume.
(3) MUTE pin
(2) Rock position
By pulling up the ROCK pin to VCC, low frequencies are
boosted by about 7dB. High frequencies are also ad-
justed to balance the subjectively heard sound.
(3) Pop position
If the MUTE pin is pulled up to VCC, the effective graphic
equalizerposition will be FLAT regardless of the selected
position. (However, ifthepoppositionhasbeenselected,
the mid-range boost will be maintained.)
BypullingupthePOPSpintoVCC,mid-rangefrequencies
are boosted by about 6dB and combined with the rock
position characteristics.
(4) DET 2 pin
(4) Jazz position
If the stereo output signal from the power amplifier is
mixed and input to the DET 2 pin, the effective graphic
equalizer position will be FLAT during high level output
regardless of the selected position. (However, if the pop
position has been selected, the mid-range boost will be
maintained.)
By open-circuiting the above three pins, low frequencies
are boosted by 14dB. High frequencies are also adjusted
to balance the subjectively heard sound.
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BA3840KV
FApplication example
FOperation notes
(1) Graphic equalizer positions
When selecting a position, be sure to open-circuit the
non-selected pins.
(3) Recommended operating conditions
Furthermore, if a condition for an electrical characteristic
is not satisfied while within the ambient operating tem-
perature range, the standard value for that electrical
characteristic cannot be guaranteed. Despite this, how-
ever, no abrupt changes to the electrical characteristic
will occur.
If any are pulled down to ground, over-current can result.
(2) Test pins
The test pins are all connected to internal circuits. They
are not N.C. pins, therefore open-circuit them, do not
ground them.
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BA3840KV
FElectrical characteristic curves
FExternal dimensions (Units: mm)
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