LA3246 Datasheet, PDF (5/13 Pages) Sanyo Semicon Device – Stereo Preamplifier for Compact Double Cassette Playback-only Use

LA3246
(3) When an electrolytic capacitor is connected to input pins 1, 2 (or 23, 24), make the value of R_IN1 as equal to that of R_IN2 as
possible.
The difference in the value between R_IN1 and R_IN2 causes the variation in amp output DC voltage at the time of F/R
switching. Therefore, the input DC voltage (voltage across R_IN) must be made as equal as possible.
(4) The amplifier output characteristics are designed to be the same in the Nor Tape/High Speed (pin 15 GND/pin 6 V_CC) and
Me Tape/Nor Speed (pin 15 V_CC/pin 6 GND) modes. (Refer to sample application circuit, external constants.)
(5) When externally turning ON/OFF power supply pin 11 (by bringing pin 11 to +V_CC/GND level) with a capacitor connected
to pin 13, connect external diode D, as shown below, so that no breakdown (or deterioration) of the IC system is caused by
I_CD when the switch is turned OFF. When no capacitor is connected to pin 13, diode D is not required.
(6) The output MIX circuit is of the emitter follower configuration as shown below.
Unit (resistance: Ω)
The MIX OUT output level V_O MIX at the time a signal is applied to preamp1 (or preamp2) only is 1/2 as compared with
output levels V_O1, V_O2 at the time the same input signal is applied to both channels.
V_O MIX = 1/2 V_O1(= 1/2 × V_O2)
where V_O1 = V_O2
No.2651-5/13