2-channel head switch for radio cassette recorders - Rohm
Description
Audio ICs
2-channel head switch for radio cassette recorders
BA3126F / BA3126N
The BA3126F and BA3126N are dual-channel tape head switching ICs designed for use in radio cassette players.
These ICs are designed to withstand voltages of up to 120VP-PMin.
, and can handle large-amplitude bias signals during recording.
Both devices have two channels, and are ideal for use in radio-cassette players.
The package types are 14-pin SOP for the BA3126F, and 9-pin SIP for the BA3126N.
FApplications Radio-cassette players
FFeatures 1) High withstanding voltage (120VP-PMin.
at f = 100kHz).
2) Low “on” resistance (P / B SW : 8Ω, REC SW : 5Ω)
3) Low offset voltage (P / B SW : 5.
0mV, REC SW : 0.
6mV)
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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Audio ICs
FBlock diagram
BA3126F / BA3126N
FInternal circuit configuration
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Audio ICs
BA3126F / BA3126N
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 9.
0V, measurement circuit : Figs.
7 and 8).
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Audio ICs
FMeasurement circuit
BA3126F / BA3126N
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Audio ICs
FCircuit operation (1) Playback mode When the control pin voltage goes below 0.
5V, the REC SW goes off and the P / B SW goes on to put the IC into playback mode.
In this mode, the playback signal from the head is sent to the P / B amplifier via the REC SW.
FOperation notes (1) When the voltage on the control pin drops below 0.
5V, (pin 5 for the BA3126F, and pin 4 for the BA3126N) the IC switches to P / B mode .
When the voltage is 0V, the maximum source current generated is 120µA (ILOW).
When the voltage on the control pin goes above 3.
9V the IC switches to REC mode.
When the voltage is 5V, the maximum sink current generated is 180µA (IHIGH).
When the control pin is open, the voltage on it is 3VF (approximately 2.
0V).
All switches are on at this time.
BA3126F / BA3126N
(2) REC mode When the control pin voltage goes above 3.
9V, the P / B SW goes off and the REC SW goes on to put the IC into record ...
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