MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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by MC145554/D
PCM Codec-Filter
The MC145554, MC145557, MC145564, and MC145567 are all per channel
PCM Codec鈥揊ilters. These devices perform the voice digitization and
reconstruction as well as the band limiting and smoothing required for PCM
systems. They are designed to operate in both synchronous and asynchronous
applications and contain an on鈥揷hip precision voltage reference. The
MC145554 (Mu鈥揕aw) and MC145557 (A鈥揕aw) are general purpose devices
that are offered in 16鈥損in packages. The MC145564 (Mu鈥揕aw) and MC145567
(A鈥揕aw), offered in 20鈥損in packages, add the capability of analog loopback and
push鈥損ull power amplifiers with adjustable gain.
These devices have 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鈥揾igh鈥揻requency noise
from being modulated down to the pass band 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
passes the analog signal from 200 Hz to 3400 Hz before the signal is digitized
by the differential compressing A/D converter.
The decoder accepts PCM data and expands it using a differential 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.
These PCM Codec鈥揊ilters accept both long鈥揻rame and short鈥揻rame industry
standard clock formats. They also maintain compatibility with Motorola鈥檚 family
of TSACs and MC3419/MC34120 SLIC products.
The MC145554/57/64/67 family of PCM Codec鈥揊ilters utilizes CMOS due to
its reliable low鈥損ower performance and proven capability for complex
analog/digital VLSI functions.
MC145554/57
(16鈥揚in Package)
鈥?/div>
Fully Differential Analog Circuit Design for Lowest Noise
鈥?/div>
Performance Specified for Extended Temperature Range of 鈥?40 to + 85掳C
鈥?/div>
Transmit Band鈥揚ass and Receive Low鈥揚ass Filters On鈥揅hip
鈥?/div>
Active R鈥揅 Pre鈥揊iltering and Post鈥揊iltering
鈥?/div>
Mu鈥揕aw Companding MC145554
鈥?/div>
A鈥揕aw Companding MC145557
鈥?/div>
On鈥揅hip Precision Voltage Reference (2.5 V)
鈥?/div>
Typical Power Dissipation of 40 mW, Power Down of 1.0 mW at
卤
5 V
MC145564/67
(20鈥揚in Package) 鈥?All of the Features of the MC145554/57 Plus:
鈥?/div>
Mu鈥揕aw Companding MC145564
鈥?/div>
A鈥揕aw Companding MC145567
鈥?/div>
Push鈥揚ull Power Drivers with External Gain Adjust
鈥?/div>
Analog Loopback
MC145554
MC145557
MC145564
MC145567
L SUFFIX
CERAMIC PACKAGE
CASE 620
MC145554/57
P SUFFIX
PLASTIC DIP
CASE 648
MC145554/57
DW SUFFIX
SOG PACKAGE
CASE 751G
MC145554/57
16
1
16
1
16
1
20
1
L SUFFIX
CERAMIC PACKAGE
CASE 732
MC145564/67
20
1
P SUFFIX
PLASTIC DIP
CASE 738
MC145564/67
DW SUFFIX
SOG PACKAGE
CASE 751D
MC145564/67
20
1
REV 1
9/95 (Replaces ADI1517)
漏
Motorola, Inc. 1995
MOTOROLA
MC145554鈥C145557鈥C145564鈥C145567
1
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