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BA3529AFP Datasheet(PDF) 9 Page - Rohm

Part # BA3529AFP
Description  Pre / power amplifier and motor governor for 3V headphone stereos
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BA3529AFP Datasheet(HTML) 9 Page - Rohm

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3180
10–6
C1 =
R1
)200)103
R2 = 2
R1
10–GVC/20
393
Audio ICs
BA3528AFP / BA3529AFP
FAttached components
(1)
Preamplifier
If the closed-loop voltage gain (GVC) of the preamplifier
is below 30dB for a frequency of f = 1kHz, oscillation may
occur.
(2)
Playback equalizer terminal (NAB)
The playback equalizer characteristics are determined
by the RC circuit connected between the output and NF
pins.
For the circuit in Fig. 9, with a closed-loop voltage gain
of GVC at an input frequency of 1 kHz, the relationships
between the values of the RC circuit components are as
follows:
The equalizer can be switched on and off using the mute
amplifier. If equalization for metal tape is added, deter-
mine R3 as follows:
R3 = 1.4
R1
(3)
Pre-mute switching noise
If you use the mute amplifier for pre-muting,
the voltage difference between the pre-output and pin 22
will generate switching noise (a “pop” sound) when the
mute is switched on and off. To reduce the DC gain and
reduce this switching noise, we recommend that you
connect a resistor (R = 51 k
Ω) as shown in Fig. 10. This
resistor reduces the gain of the circuit in the bass region
of the playback equalizer as shown in the graph in Fig.
11. By using different combinations of component values
for R1 and C1, it is possible to compensate for this effect
in the low-frequency region as shown in the graph in Fig.
12.


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