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 Communication ICs
Pseudo inductance for telephones
BA8201 / BA8201F
The BA8201 and BA8201F are ICs with a choke coil action, capable of extracting the DC current from a telephone line while maintaining a high inductance on the telephone line side. This eliminates the need for a choke coil, and facilitates use of the telephone set line in a variety of applications.
FApplications Household telephones
FFeatures 1) Corresponds to choke coil of several henries. 2) Extracts DC current while maintaining high inductance on telephone line side. 3) Capable of extracting large output current. 4) Wide dynamic range.
5) Two output voltage modes available for selection. S Line voltage seek mode S Constant voltage mode 6) DIP 8 and SOP 8 pin packages available.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
300
Communication ICs
FBlock diagram
BA8201 / BA8201F
301
Communication ICs
FPin descriptions
BA8201 / BA8201F
302
Communication ICs
BA8201 / BA8201F
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VLN = 4V, LN = 100mVrms, Io = 5mA, f = 1kHz)
FMeasurement circuits
303
Communication ICs
BA8201 / BA8201F
304
Communication ICs
FApplication example
BA8201 / BA8201F
FAttached components C1: This is a capacitor for phase compensation, and is normally connected at 68pF. C2: This is a coupling capacitor. The inductance from the telephone line changes based on this value. Normally, a value of 2.2F to 10F is appropriate. C3: This is a capacitor for phase compensation, and is normally connected at 47pF. C4: This is the capacitor for balancing the output. It suppresses rippling in the output and also carries out decoupling 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 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 (A) R2 () (reference value) 22A is the reference internal current source for the IC.
305
Communication ICs
FElectrical characteristic curves
BA8201 / BA8201F
306
Communication ICs
FExternal dimensions (Units: mm)
BA8201 / BA8201F
307


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