MSM6896 データシートの表示（PDF） - Oki Electric Industry

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MSM6896

Multi-Function PCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM6895/6896

R1I, R2I, RPO

Receive preamplifier inputs and output.

R1I and R2I are for the inputs and RPO is for the output of the receive preamplifier. Normally,

R1I is connected via an AC-coupling capacitor to the CODEC analog output (CAO), and R2I is

used as the mixing signal input pin.

During initial setting, the RPO output is in non-signal state (VSG level), and speech signal,

RTONE1, RTONE2, FTONE, PB acknowledge tone, and side tone signal are output through

processor control. And if the three-party speech function is required, the R2I pin is connected to

the analog output of the other CODEC.

MLDY

Hold tone signal input.

This pin is connected to the output of external melody IC. Through processor control, the signal

applied to MLDYI is output from the TO output pin as a hold tone on the transmit path, and from

the SPO output pin as a hold acknowledge tone on the receive path.

TPBI

Transmit signal input.

When the handset is used, TPBI is connected to the transmit preamplifier output pin (TPAO). If

adjustment of frequency characteristics on the transmit path is required, insert a circuit for

adjustment of characteristic between TPAO and TPBI. Through processor control, the signal

applied to this pin is output via the T1O and T2O pins on the transmit path output and its side

tone via the RPO pin.

A circuit example for adjustment of frequency characteristics

TPAO

R3

TPBI

VSG

C3

R4

C4

TMX1I, TMX2I

Transmit addition signal inputs.

Through processor control, the input signals to TMX1I and TMX2I are added to the transmit

signal and are output to T1O and T2O respectively.

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