IDT82V1671AJ IDT, Integrated Device Technology Inc, IDT82V1671AJ Datasheet - Page 20

• Manufacturer Part Number: IDT82V1671AJ
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT82V1671AJ

• 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: Compliant

3.3
3.3.1
CODEC is shown in
and longitudinal currents on the subscriber line are sensed by the RSLIC
3.3.1.1
Figure -
RSLIC & CODEC CHIPSET
ACP
ACN
The signal paths for AC transmission between the RSLIC and the
The voice signal path within the CODEC for one channel is shown in
VTAC
9.
Analog Gain
Receive
SPEECH PROCESSING
AC TRANSMISSION
Transmit Path
Analog Gain for
Scaling (AGIS)
Impedance
Figure -
Filter (AAF)
Anti-Alias
Filter & SCF
Smoothing
8. In the transmit direction, the transversal
Demodulator
Sigma-Delta
Sigma-Delta
Modulator
(D-SDM)
TIP
RING
TIP
RING
TIP
RING
TIP
RING
(SDM)
Scaling (GIS)
Impedance
RSLIC
RSLIC
RSLIC
RSLIC
Gain for
#1
#2
#3
#4
Interpolation
Decimation
VTAC
VTAC
VTAC
VTAC
ACP
ACP
ACP
ACP
Figure - 8 Signal Paths for AC Transmission
ACN
ACN
ACN
ACN
Filter
VL
VL
VL
VL
Filter
3rd
Figure - 9 Voice Signal Path of the CODEC
1st
Transmit Path
Impedance
Filter (IMF)
Matching
Receive Path
Balance Filter
Transhbrid
(ECF)
Digital Gain
Digital Gain
Receive
Transmit
(GRX)
Transmit Path
(GTX)
20
ACP1
ACN1
ACP2
ACN2
ACP3
ACN3
ACP4
ACN4
VL1
VTAC1
VL2
VTAC2
VL3
VTAC3
VL4
VTAC4
Receive Path
and the corresponding voltages are fed to the CODEC via VTAC and VL
pins. The voltage signals are further processed within the CODEC and
finally transmitted to the PCM highway. In the receive direction, the
CODEC processes data received from the PCM highway and outputs a
differential analog signal to the RSLIC via the ACP and ACN pins. The
RSLIC then amplifies this signal and applies it to the subscriber line.
CODEC
Decimation
Interpolation
Filter
2nd
Filter
2nd
Low-Pass
Transmit
Transmit
Low-Pass
Receive
Filter
Filter
Receive
MPI or GCI Interface
Frequency Response
Frequency Response
Correction Transmit
Correction Receive
(Data Downstream)
(Data Upstream)
IDT82V1671/IDT82V1671A, IDT82V1074
(FRX)
(FRR)
PCM out
PCM in
Fixed Filter
Programmable Filter
Filter Transmit
Interpolation
High-Pass
(HPF)
Filter
1st
Encoder
Decoder
PCM
PCM
Assignment
Assignment
Time Slot
Time Slot
DX1/DX2
DR1/DR2