XC145481
MOTOROLA
1
Product Preview
3 V PCM Codec-Filter
The XC145481 is a general purpose per channel PCM CodecFilter with pin
selectable MuLaw or ALaw companding, and is offered in 20pin DIP, SOG,
and SSOP packages. This device performs the voice digitization and
reconstruction as well as the band limiting and smoothing required for PCM
systems. This device is designed to operate in both synchronous and
asynchronous applications and contains an onchip precision reference
voltage.
This device has an input operational amplifier whose output is the input to the
encoder section. The encoder section immediately lowpass filters the analog
signal with an active RC filter to eliminate very high frequency noise from being
modulated down to the passband by the switched capacitor filter. From the
active RC 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 singleended
design, which reduces the significance of noise to both the inverted and
noninverted signal paths. Another advantage of this differential design is that
noise injected via the power supplies is a commonmode signal that is
cancelled when the inverted and noninverted signals are recombined. This
dramatically improves the power supply rejection ratio.
After the differential converter, a differential switched capacitor filter
bandpasses 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 lowpass filtered at 3400 Hz and sinX/X
compensated by a differential switched capacitor filter. The signal is then filtered
by an active RC filter to eliminate the out of band energy of the switched
capacitor filter.
The XC145481 PCM CodecFilter accepts a variety of clock formats,
including Short Frame Sync, Long Frame Sync, IDL, and GCI timing
environments.
The XC145481 PCM CodecFilter utilizes CMOS due to its reliable
lowpower performance and proven capability for complex analog/digital VLSI
functions.
Single 3 V Power Supply
Typical Power Dissipation of 12 mW, PowerDown of 0.01 mW
Fully Differential Analog Circuit Design for Lowest Noise
Transmit BandPass and Receive LowPass Filters OnChip
Active RC PreFiltering and PostFiltering
MuLaw and ALaw Companding by Pin Selection
OnChip Precision Reference Voltage (0.886 V) for a 5 dBm TLP @ 600
PushPull 300
Power Drivers with External Gain Adjust
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
Order this document
by XC145481/D
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
XC145481
P SUFFIX
PLASTIC DIP
CASE 738
DW SUFFIX
SOG PACKAGE
CASE 751D
ORDERING INFORMATION
XC145481P
Plastic DIP
XC145481DW
SOG Package
XC145481SD
SSOP
20
1
20
1
SD SUFFIX
SSOP
CASE 940C
VDD
PO
PI
RO
VAGREF
PDI
BCLKR
DR
FSR
PO+
5
4
3
2
1
10
9
8
7
6
14
15
16
17
18
19
20
11
12
13
Mu/A
TG
TI
TI+
VAG
MCLK
BCLKT
DT
FST
VSS
20
1
Motorola, Inc. 1995
REV 0
10/95
XC145481
MOTOROLA
2
PACKAGE DIMENSIONS
P SUFFIX
PLASTIC DIP
CASE 73803
1.070
0.260
0.180
0.022
0.070
0.015
0.140
15
0.040
1.010
0.240
0.150
0.015
0.050
0.008
0.110
0
0.020
25.66
6.10
3.81
0.39
1.27
0.21
2.80
0
0.51
27.17
6.60
4.57
0.55
1.77
0.38
3.55
15
1.01
0.050 BSC
0.100 BSC
0.300 BSC
1.27 BSC
2.54 BSC
7.62 BSC
MIN
MIN
MAX
MAX
INCHES
MILLIMETERS
DIM
A
B
C
D
E
F
G
J
K
L
M
N
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
-A-
C
K
N
E
G
F
D
20 PL
J
20 PL
L
M
-T-
SEATING
PLANE
1
10
11
20
0.25 (0.010)
T
A
M
M
0.25 (0.010)
T
B
M
M
B
DW SUFFIX
SOG PACKAGE
CASE 751D04
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.150
(0.006) PER SIDE.
5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D DIMENSION
AT MAXIMUM MATERIAL CONDITION.
A
B
20
1
11
10
S
A
M
0.010 (0.25)
B
S
T
D
20X
M
B
M
0.010 (0.25)
P
10X
J
F
G
18X
K
C
T
SEATING
PLANE
M
R
X 45
_
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
A
12.65
12.95
0.499
0.510
B
7.40
7.60
0.292
0.299
C
2.35
2.65
0.093
0.104
D
0.35
0.49
0.014
0.019
F
0.50
0.90
0.020
0.035
G
1.27 BSC
0.050 BSC
J
0.25
0.32
0.010
0.012
K
0.10
0.25
0.004
0.009
M
0
7
0
7
P
10.05
10.55
0.395
0.415
R
0.25
0.75
0.010
0.029
_
_
_
_
XC145481
MOTOROLA
3
SD SUFFIX
SSOP
CASE 940C03
20
11
10
1
H
A
B
F
M
K
20X REF
S
U
M
0.12 (0.005)
V
S
T
L
L/2
PIN 1
IDENT
S
U
M
0.20 (0.008)
T
V
U
D
C
0.076 (0.003)
G
T
SEATING
PLANE
DETAIL E
N
N
0.25 (0.010)
K
J
J1
K1
SECTION NN
DIM
A
MIN
MAX
MIN
MAX
INCHES
7.07
7.33
0.278
0.288
MILLIMETERS
B
5.20
5.38
0.205
0.212
C
1.73
1.99
0.068
0.078
D
0.05
0.21
0.002
0.008
F
0.63
0.95
0.024
0.037
G
0.65 BSC
0.026 BSC
H
0.59
0.75
0.023
0.030
J
0.09
0.20
0.003
0.008
J1
0.09
0.16
0.003
0.006
K
0.25
0.38
0.010
0.015
K1
0.25
0.33
0.010
0.013
_
_
_
_
NOTES:
1.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2.
CONTROLLING DIMENSION: MILLIMETER.
3.
DIMENSION A DOES NOT INCLUDE MOLD
FLASH, PROTRUSIONS OR GATE BURRS. MOLD
FLASH OR GATE BURRS SHALL NOT EXCEED
0.15 (0.006) PER SIDE.
4.
DIMENSION B DOES NOT INCLUDE
INTERLEAD FLASH OR PROTRUSION.
INTERLEAD FLASH OR PROTRUSION SHALL NOT
EXCEED 0.15 (0.006) PER SIDE.
5.
DIMENSION K DOES NOT INCLUDE DAMBAR
PROTRUSION/INTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN
EXCESS OF K DIMENSION AT MAXIMUM
MATERIAL CONDITION. DAMBAR INTRUSION
SHALL NOT REDUCE DIMENSION K BY MORE
THAN 0.07 (0.002) AT LEAST MATERIAL
CONDITION.
6.
TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
7.
DIMENSION A AND B ARE TO BE
DETERMINED AT DATUM PLANE W.
L
7.65
7.90
0.301
0.311
M
0
8
0
8
DETAIL E
W
XC145481
MOTOROLA
4
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,
and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different
applications. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does
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associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
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XC145481/D
*XC145481/D*
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