1

0.4

(

µF)

730

Audio ICs

BA336 / BA338 / BA338L

FApplication example

FAttached components (see Fig. 3)

(1)

This capacitor is for coupling a pre-amp to the

BA336 / BA338 / BA338L.

If the DC level of the pre-amp output is GND, the coupling

capacitor can be omitted. If a coupling capacitor is con-

nected, Pin 3 must be connected to GND through a resis-

tor. If the resistor between Pin 3 and GND is too large, an

offset will occur due to a voltage drop caused by the input

current, and the input decision level will change. We rec-

ommend 10k

Ω or less. The input decision level of the

BA336 / BA338 / BA338L is highly sensitive at

*52dBm.

In the application example, the pre-stage output is di-

vided to adjust the sensitivity and increase the input im-

pedance. Furthermore, the low cutoff frequency fc is de-

termined by the input circuit time constant or the Pin 4

time constant, whichever is smaller. As it is better to de-

we recommend making the time constant of the input cir-

cuit larger than that of Pin 4.

(2)

800Hz.

to stabilize when the power is turned on.

(3)

After the power is turned on, this capacitor stops song

lows :

µF)

(4)

This capacitor prevents errors due to pulse noise.

When an input signal is shorter than the time determined

ms (BA336), the IC will not respond and an output pulse

will not be generated. If pulse noise appears continuous-

ly at the input, the effectiveness of the noise filter will be

decreased. If it is likely that continuous noise will appear,

y 30kΩ).

There are differences in the noise filter functions of the

BA336 and the BA338 / BA338L. Refer to the section,

“Differences between the noise filters of the BA336 and

BA338 / BA338L”.