ROHM BA6569AS, BA6569AFP Datasheet

Communication ICs

Speech network for telephones

BA6569AS / BA6569AFP

The BA6569AS and BA6569AFP are speech networks which possesses the basic functions required for handset com­munications. In addition to amplifying signals from a transmitter and sending them to a telephone line, they also amplify
only reception signals from a telephone line and drive the receiver. In addition to a function which compensates for fluc­tuation in the transmission and reception volume caused by the length of the telephone line (AGC), they are also
equipped with a manual PAD function in order to accommodate PBX.

FApplications
Telephones and telephone equipment

FFeatures

1) Basic speech network functions built in.

2) Single output pin of reception pre-amplifier is sepa­rate.

3) Single input pin of reception pre-amplifier is sepa­rate, enabling mixing of input.

4) Input to microphone pre-amplifier is balanced and of­fers high resistance to in-line noise.

5) Input pin of MF pre-amplifier enables mixing of input.

6) Manual pad pin included.

7) Pre-amplifiers for reception, microphone, and MF
employ AGC based on telephone line current.

8) AC impedance can be raised by altering the posi­tive feedback. This enables configuration of power
supply circuits for microcomputers and other ap­plications using only a single resistor.

9) A BTL circuit is used for reception output, and the
wide dynamic range enables both dynamic and ce­ramic receivers to be accommodated.

10) Few external attachments are required.

11) 22-pin SDIP and 24-pin HSOP packages available.

FAbsolute maximum ratings (Ta = 25_C)

226

Communication ICs BA6569AS / BA6569AFP

Block diagram

227

Communication ICs BA6569AS / BA6569AFP

FElectrical characteristics (unless otherwise noted, Ta = 25_C, f = 1kHz, BPF = 400Hz to 30kHz)

228

Communication ICs BA6569AS / BA6569AFP

Electrical characteristic curves

229