305

Communication ICs

BA8201 / BA8201F

FApplication example

FAttached components

C1:

This is a capacitor for phase compensation, and is nor-

mally connected at 68pF.

C2:

This is a coupling capacitor. The inductance from the

telephone line changes based on this value. Normally, a

value of 2.2

µF to 10µF is appropriate.

C3:

This is a capacitor for phase compensation, and is nor-

mally connected at 47pF.

C4:

This is the capacitor for balancing the output. It sup-

presses rippling in the output and also carries out de-

coupling for the bias voltage supply of the IF pin. It should

be adjusted based on the output current, load, and other

factors.

R1:

Bias is applied from this pin to the IF pin. The inductance

from the telephone line changes based on this value.

Normally, a value of 100k

Ω is appropriate.

R2:

This can be connected between Pins 6 and 7 to clamp the

output voltage. The output voltage is expressed using the

equation below.

Vo (V) = 2

22 (

µA)

R2 (

Ω) (reference value)

∗22µA is the reference internal current source for

the IC.