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5 V 13-Bit Linear PCM
Codec-Filter
The MC145482 is a 13鈥揵it linear PCM Codec鈥揊ilter with 2s complement data
format, and is offered in 20鈥損in SOG and SSOP packages. This device
performs the voice digitization and reconstruction as well as the band limiting
and smoothing required for the voice coding in digital communication systems.
This device is designed to operate in both synchronous and asynchronous
applications and contains an on鈥揷hip precision reference voltage.
This device has an input operational amplifier whose output is the input to the
encoder section. The encoder section immediately low鈥損ass filters the analog
signal with an active R鈥揅 filter to eliminate very high frequency noise from being
modulated down to the passband by the switched capacitor filter. From the
active R鈥揅 filter, the analog signal is converted to a differential signal. From this
point, all analog signal processing is done differentially. This allows processing
of an analog signal that is twice the amplitude allowed by a single鈥揺nded
design, which reduces the significance of noise to both the inverted and
non鈥搃nverted signal paths. Another advantage of this differential design is that
noise injected via the power supplies is a common鈥搈ode signal that is
cancelled when the inverted and non鈥搃nverted signals are recombined. This
dramatically improves the power supply rejection ratio.
After the differential converter, a differential switched capacitor filter band鈥?/div>
passes the analog signal from 200 Hz to 3400 Hz before the signal is digitized
by the differential 13鈥揵it linear A/D converter. The digital output is 2s
complement format.
The decoder digital input accepts 2s complement data and reconstructs it
using a differential 13鈥揵it linear D/A converter. The output of the D/A is
low鈥損ass filtered at 3400 Hz and sinX/X compensated by a differential switched
capacitor filter. The signal is then filtered by an active R鈥揅 filter to eliminate the
out鈥搊f鈥揵and energy of the switched capacitor filter.
The MC145482 PCM Codec鈥揊ilter has a high impedance VAG reference pin
which allows for decoupling of the internal circuitry that generates the
mid鈥搒upply VAG reference voltage to the VSS power supply ground. This
reduces clock noise on the analog circuitry when external analog signals are
referenced to the power supply ground.
The MC145482 13鈥揵it linear PCM Codec鈥揊ilter accepts both Short Frame
Sync and Long Frame Sync clock formats, and utilizes CMOS due to its reliable
low鈥損ower performance and proven capability for complex analog/digital VLSI
functions.
鈥?/div>
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Single 5 V Power Supply
13鈥揃it Linear ADC/DAC Conversions with 2s Complement Data Format
Typical Power Dissipation of 25 mW, Power鈥揇own of 0.01 mW
Fully鈥揇ifferential Analog Circuit Design for Lowest Noise
Transmit Band鈥揚ass and Receive Low鈥揚ass Filters On鈥揅hip
Transmit High鈥揚ass Filter May be Bypassed by Pin Selection
Active R鈥揅 Pre鈥揊iltering and Post鈥揊iltering
On鈥揅hip Precision Reference Voltage of 1.575 V for a 0 dBm TLP
@ 600
鈩?/div>
Full鈥揇uplex Sample Rates from 7 k to 16 k Samples/s
3鈥揟erminal Input Op Amp Can be Used, or a 2鈥揅hannel Input Multiplexer
Receive Gain Control from 0 dB to 鈥?21 dB in 3 dB Steps in Synchronous
Operation
Push鈥揚ull 300
鈩?/div>
Power Drivers with External Gain Adjust
MC145482
DW SUFFIX
SOG PACKAGE
CASE 751D
20
1
20
SD SUFFIX
SSOP
CASE 940C
1
ORDERING INFORMATION
MC145482DW
MC145482SD
SOG Package
SSOP
PIN ASSIGNMENT
VAG Ref
RO鈥?/div>
PI
PO鈥?/div>
PO+
VDD
FSR
DR
BCLKR
PDI
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VAG
TI+
TI鈥?/div>
TG
HB
VSS
FST
DT
BCLKT
MCLK
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
REV 0
3/97 TN97032700
漏
Motorola, Inc. 1997
MOTOROLA
MC145482
1
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