PCD5096 datasheet(38/52 Pages) PHILIPS

38 / 52 page

1997 Jan 22

Philips Semiconductors

Preliminary speciﬁcation

Universal codec

PCD5096

Table 37 Control registers for two active channels

13.2

Conference call between one PSTN line and two IOM buffers

The PCD5096 is able to perform a 3 party conference call. Figure 23 shows a typical configuration, with two handsets in

conference call with an PSTN line. Tables 38, 39 and 40 show possible settings for the DSP parameters, the IOM control

table and the control registers in the PCD5096.

Note that the LLb block of the PCD5096 could be used in parallel to connect a second PSTN line to another IOM buffer.

This is not covered in this example.

SDR

ADDRESS

(HEX)

PARAMETER NAME

VALUE

(HEX)

FUNCTION

codec control

005B

Codec 1 ON, Codec 2 ON

IOM control

0004

IOM slave mode, 768 kbits/s

gain settings A/D and D/A paths

D0D0

A/D gain = +9 dB, D/A gain = 0 dB for both channels

VREF1, VREF2 settings

A0A0

default setting for VREF1 and VREF2

DSP modes

0048

both channels run in speech and tone mode

Fig.23 Conference call between one PSTN line and two IOM buffers.

handbook, full pagewidth

MBH879

PPa, PPb

RADIO

CIRCUIT

IOM-2

LLa

LLb

CCa

a/b

PCD5093

PCD5096

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