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Communication ICs
Speech network
BA6566 / BA6566F / BA6566FP
The BA6566, BA6566F, and BA6566FP are speech network ICs which possess the basic functions required for handset
communications. In addition to amplifying signals from a transmitter and sending them to a telephone line, they amplify
only reception signals from a telephone line and drive the receiver. They also compensate for fluctuation in the volume
at which signals are transmitted and received, caused by the length of the telephone line (AGC).
Applications
Telephones and telephone equipment
Features
1) Can accommodate both dynamic and piezoelectric
receivers, simply by changing the circuit constant for
a wide dynamic reception range.
2) Automatic gain control (AGC) is used, based on the
transmission and reception telephone line current,
for easier compliance with communications stan-
dards.
3) Erroneous operation caused by high-frequency elec-
trical wave interference is minimized.
4) An HSOP package is used, eliminating the need for
an attached transistor to dissipate heat. This means
that a common circuit can be shared when a DIP
package is used (BA6566FP).
Block diagram