IDT821024 Datasheet, PDF (1/13 Pages) Integrated Device Technology – QUAD NON-PROGRAMMABLE PCM CODEC

QUAD NON-PROGRAMMABLE
PCM CODEC
IDT821024
FEATURES
• 4 channelCODEC with on-chip digital filters
• Selectable A-law orµ-law companding
• Master clock frequency selection: 2.048 MHz, 4.096 MHz or
8.192 MHz
- Internal timing automatically adjusted based on MCLK and
frame sync signal
• Separate PCM and master clocks
• Single PCM port with up to 8.192 MHz data rate (128 time slots)
• Transhybridbalanceimpedancehardwareadjustableviaexternal
components
• Transmitgainshardwareadjustableviaexternalcomponents
• Low power +5.0 V CMOS technology
• +5.0 V single power supply
• Package available: 32 pin PLCC, 44 pin TQFP
DESCRIPTION
The IDT821024 is a single-chip, four channel PCM CODEC with on-
chip filters. The device provides analog-to-digital and digital-to-analog
conversions and supports both a-law and µ−law companding. The digital
filters in IDT821024 provides the necessary transmit and receive filtering
for voice telephone circuit to interface with time-division multiplexed
systems. All of the digital filters are performed in digital signal processors
operating from an internal clock, which is derived from MCLK. The fixed
filters set the transmit and receive gain and frequency response.
In the IDT821024 the PCM data is transmitted to and received from
the PCM highway in time slots determined by the individual Frame Sync
sMigHnza.lsB(oFthSRL_{noanngdaFnSdXSn},hworhteFreranm=e1S-4y)nact
rates from 256 KHz to
modes are available
8.192
in the
IDT821024.
The IDT821024 can be used in digital telecommunication applications
such as PBX, Central Office Switch, Digital Telephone and Integrated Voice/
Data Access Unit.
FUNCTIONAL BLOCK DIAGRAM
IIN1
VOUT1
IIN2
VOUT2
IIN3
VOUT3
IIN4
VOUT4
MCLK
IREF
CNF
Anolog Front End
CH1
Anolog Front End
CH2
Anolog Front End
CH3
Anolog Front End
CH4
Clock
&
Reference Circuits
DSP
PCM TSA 1
PCM TSA 2
PCM TSA 3
PCM TSA 4
PCM Interface
Control
FSX1
FSR1
FSX2
FSR2
FSX3
FSR3
FSX4
FSR4
DX
TSC
DR
PCLK
PDN 1~ 4
A/µ
The IDT logo is a registered trademark of Integrated Device Technology, Inc
INDUSTRIAL TEMPERATURE RANGE
1
©2003 Integrated Device Technology, Inc.
APRIL 3, 2003
DSC-6034/4