IDT821054APFG8 IDT, Integrated Device Technology Inc, IDT821054APFG8 Datasheet - Page 11

• Manufacturer Part Number: IDT821054APFG8
• Description: IC PCM CODEC QUAD MPI 64-TQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: PCM Codec/Filterr

Specifications of IDT821054APFG8

• Data Interface: PCM Audio Interface
• Number Of Adcs / Dacs: 4 / 4
• Sigma Delta: No
• Voltage - Supply, Analog: 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 821054APFG8

IDT821054A QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE
2.2
2.2.1
users to optimize the performance of the IDT821054A for the system.
Figure - 4
programmable blocks.
2.2.2
can be selected as 0 dB or 6 dB. The selection is done by the GAD bit in
LREG9. It is 0 dB by default.
can be selected as 0 dB or -6 dB. The selection is done by the GDA bit
in LREG9. It is 0 dB by default.
be disabled by setting the CS[5] bit in LREG1 to ‘0’. If the CS[5] bit in
LREG1 is set to ‘1’, the GTX filter will be enabled and the digital gain will
be programmed by the coefficient RAM. Note that the RAM block for
containing GTX coefficient is shared by all four channels. That is, once
the GTX coefficient is written to the coe-RAM, it will be used by all four
channels. The GTX is programmable from -3 dB to +12 dB with
Several blocks are programmable for signal processing. This allows
The programmable digital filters are used to adjust gain and
Abbreviation List:
LPF/AA: Anti-Alias Low-pass Filter
LPF/SC: Smoothing Low-pass Filter
LPF: Low-pass Filter
HPF: High-pass Filter
GIS: Gain for Impedance Scaling
D1: 1st Down Sample Stage
D2: 2nd Down Sample Stage
U1: 1st Up Sample Stage
U2: 2nd Up Sample Stage
UF: Up Sampling Filter (64 k - 128 k)
For each individual channel, the analog A/D gain in the transmit path
For each individual channel, the analog D/A gain in the receive path
For each channel, the digital gain filter in the transmit path (GTX) can
VOUT
VIN
DSP PROGRAMMING
SIGNAL PROCESSING
GAIN ADJUSTMENT
shows the signal flow for each channel and indicates the
Analog
LPF/AA
LPF/SC
LREG1: CS[2]
CS[2] = 1: enable (normal)
CS[2] = 0: disable (cut)
∑
−
∆
@2 MHz
∑
−
∆
GIS
LREG1: CS[0]
CS[0] = 1: enable (normal)
CS[0] = 0: disable (cut)
U1
D1
UF
Figure - 4 Signal Flow for Each Channel
@64 KHz
IMF
Transmit Path
Receive Path
ECF
LREG1: CS[1]
CS[1] = 1: enable (normal)
CS[1] = 0: disable (cut)
GRX
GTX
11
impedance, balance transhybrid and correct frequency response. All the
coefficients of the digital filters can be calculated automatically by a
software provided by IDT. When users provide accurate SLIC model,
impedance and gain requirements, this software will calculate all the
coefficients automatically. After loading these coefficients to the
coefficient RAM of the IDT821054A, the final AC characteristics of the
line card (consists of SLIC and CODEC) will meet the ITU-T
specifications.
minimum 0.1 dB step.
be disabled by setting the CS[7] bit in LREG1 to ‘0’. If the CS[7] bit in
LREG1 is set to ‘1’, the GRX filter will be enabled and the digital gain will
be programmed by the coefficient RAM. Note that the RAM block for
containing GRX coefficient is shared by all four channels. That is, once
the GRX coefficient is written to the coe-RAM, it will be used by all four
channels. The GRX is programmable from -12 dB to +3 dB with
minimum 0.1 dB step.
2.2.3
to VOUT for each channel. This feedback synthesizes the two-wire
impedance of the SLIC. The programmable Impedance Matching Filter
U2
D2
IMF: Impedance Matching Filter
ECF: Echo Cancellation Filter
GTX: Gain for Transmit Path
GRX: Gain for Receive Path
FRX: Frequency Response Correction for Transmit
FRR: Frequency Response Correction for Receive
CMP: Compression
EXP: Expansion
TSA: Time Slot Assignment
For each channel, the digital gain filter in the receive path (GRX) can
The IDT821054A provides a programmable feedback path from VIN
@16 KHz
LPF
LPF
IMPEDANCE MATCHING
FRX
FRR
@8 KHz
Dual Tone
LREG1: CS[3]
CS[3] = 1: enable (normal)
CS[3] = 0: disable (bypass)
HPF
Bold Black Framed: Programmable Filters
Fine Black Framed: Fixed Filters
Level Meter
CUT-OFF-PCM
INDUSTRIAL TEMPERATURE
CMP
EXP
TS
TSA
TSA
PCM Highway
DR1/DR2
DX1/DX2