BA3311L Rohm, BA3311L Datasheet

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BA3311L

Manufacturer Part Number
BA3311L
Description
Dual preamplifier with ALC
Manufacturer
Rohm
Datasheet

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The BA3311L is a dual preamplifier with ALC designed for use in stereo radio-cassette recorders. It comes in a compact
12-pin ZIP package and has two record / playback preamplifiers, and an ALC circuit. The preamplifiers are directly
coupled to the head and do not require coupling capacitors. This prevents tape head magnetization and ”pop” noise
generation.
An ALC circuit with large dynamic range can be constructed with addition of just an external detector and time constant
circuit.
FApplications
Stereo radio cassette players
FFeatures
1) The input block uses a bias circuit that does not re-
2) ALC circuit requires addition of just an external de-
FBlock diagram
Dual preamplifier with ALC
BA3311L
Audio ICs
quire coupling capacitors.
tector and time constant circuit.
3) Wide operating power supply voltage range.
4) High gain.
5) Low noise.
189

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BA3311L Summary of contents

Page 1

... Dual preamplifier with ALC BA3311L The BA3311L is a dual preamplifier with ALC designed for use in stereo radio-cassette recorders. It comes in a compact 12-pin ZIP package and has two record / playback preamplifiers, and an ALC circuit. The preamplifiers are directly coupled to the head and do not require coupling capacitors. This prevents tape head magnetization and ”pop” noise generation ...

Page 2

... Audio ICs FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) FElectrical characteristics (unless otherwise noted 25_C, V 190 = 8V, and f = 1kHz) CC BA3311L ...

Page 3

... Changing the input resistor Rg, and the ALC time constant influences the ALC transient characteristics. In particular less than 3.9k or the time constant capacitor is less than 47 F, the ALC may operate exces- sively. Do not use smaller values than those recom- mended for these components. BA3311L 191 ...

Page 4

... Audio ICs FApplication example FElectrical characteristics curve 192 FExternal dimensions (Units: mm) BA3311L ...

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