IDT82V1671J IDT, Integrated Device Technology Inc, IDT82V1671J Datasheet - Page 37

• Manufacturer Part Number: IDT82V1671J
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT82V1671J

• Number Of Channels: 4
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: Yes
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: PLCC
• Operating Temperature Classification: Industrial
• Pin Count: 28
• Mounting: Surface Mount
• Operating Current: 95mA
• Operating Supply Voltage (max): 3.465V
• Operating Supply Voltage (min): 3.135V
• Lead Free Status / RoHS Status: Not Compliant

3.8
3.8.1
facility on the PCM interface in MPI mode only. With this facility, either an
external three-party conference or an internal three-party conference
can be held without additional hardware.
conference mode is selected (GREG7: CONFX_EN=1), the chipset acts
PCM configuration registers and a conference control register. The voice
data in the receive time slots of any two partners is added by the adder
and sent to the transmit time slot of the third partner. The registers
GREG9, GREG11 and GREG13 are used to select transmit PCM
highway and time slot for the three partners. The registers GREG10,
GREG12 and GREG14 are used to select receive PCM highway and
time slot for the three partners. To avoid overflow of the sum signals, a
programmable gain stage (G) is used. The gain is programmed by
GREG8. The CONF_EN and CONFX_EN bits in GREG7 are used to
select the internal and external conferences respectively. If internal
conference is selected, the CONF_CS[1:0] bits in GREG7 are used to
select one of the four channels of the local CODEC to attend the
conference.
RSLIC & CODEC CHIPSET
The RSLIC-CODEC chipset provides a three-party conference
Figure - 20
The three-party conference facility consists of adders, gain stages,
Both A/µ-law compressed (8-bit) and linear (16-bit 2’s complement)
THREE-PARTY CONFERENCE
INTRODUCTION
shows the conference block diagram. When an external
PCM Highway1
PCM Highway2
G:
X1 - X4:
R1 - R4:
A, B, C, D:
S:
X1
A
External calling partners
Internal calling partner, which is connected to one of the four channels of the local CODEC.
Gain Stage (Gain Factor) programmed by GREG8
4 time slots in transmit PCM highway
4 time slots in receive PCM highway
CONF_EN=0
X2
G
B
+
-
1
+
0
Figure - 20 Conference Block Diagram
X3
C
+
-
+
X4
D
Subscriber S
37
as a server for three external calling partners (B, C and D) to hold a
conference with each other. When an internal conference mode is
selected (GREG7: CONF_EN=1), a conference can be held between an
internal calling partner (S) and two external calling partners (B and C).
The internal calling partner is a subscriber connected to one of the four
channels of the local CODEC. The external calling partners do not need
any conference facility, for the chipset performs all the functions required
by a conference for them.
voice data can be transferred in a three-party conference. If compressed
data format is selected, at least 7 time slots are needed in the transmit/
receive PCM highway to perform a three-party conference and use the
four local channels at the same time (three time slots for partners B, C
and D, four time slots for local Channel 1 to 4). So the lowest BCLK
frequency should be 512 kHz, corresponding to 8 time slots available.
3.8.2
shown in
the specify channel of the CODEC. When all four channels of the
chipset are powered down, no data is transferred via the PCM highways.
The P_DOWN bit together with the CONF_EN and CONFX_EN bits
control the conference behavior and the PCM line drivers.
The PCM interface can be configured to work in different mode as
Table -
PCM INTERFACE CONFIGURATION
R4
D
11. The P_DOWN bit in LREG6 is used to power down
CONF_EN=0
IDT82V1671/IDT82V1671A, IDT82V1074
R3
G
+
C
1
-
+
0
R2
G
B
R1
A