参数资料
| 型号： | MC14LC5540DW |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | IC CODEC ADPCM 28-SOIC W |
| 标准包装： | 26 |
| 类型： | ADPCM 编解码器/滤波器 |
| 数据接口： | PCM 音频接口 |
| 分辨率（位）： | 13 b |
| ADC / DAC 数量： | 1 / 1 |
| 三角积分调变： | 无 |
| 电压 - 电源，数字： | 4.5V ~ 5.5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
MC145484
MOTOROLA
2
FREQ
RO -
PI
PO -
PO +
VDD
VSS
VAG
TG
TI -
TI +
-
+
-1
1
-
+
SHARED
DAC
1.575 V
REF
ADC
TRANSMIT
SHIFT
REGISTER
SEQUENCE
AND
CONTROL
DR
FSR
BCLKR
Mu/A
PDI
MCLK
BCLKT
FST
DT
RECEIVE
SHIFT
REGISTER
VAG Ref
VDD
VSS
R*
Figure 1. MC145484 5 V PCM Codec–Filter Block Diagram
DEVICE DESCRIPTION
A PCM Codec–Filter is used for digitizing and reconstruct-
ing the human voice. These devices are used primarily for
the telephone network to facilitate voice switching and trans-
mission. Once the voice is digitized, it may be switched by
digital switching methods or transmitted long distance (T1,
microwave, satellites, etc.) without degradation. The name
codec is an acronym from ‘‘COder’’ for the analog–to–digital
converter (ADC) used to digitize voice, and ‘‘DECoder’’ for
the digital–to–analog converter (DAC) used for reconstruct-
ing voice. A codec is a single device that does both the ADC
and DAC conversions.
To digitize intelligible voice requires a signal–to–distortion
ratio of about 30 dB over a dynamic range of about 40 dB.
This may be accomplished with a linear 13–bit ADC and
DAC, but will far exceed the required signal–to–distortion
ratio at larger amplitudes than 40 dB below the peak ampli-
tude. This excess performance is at the expense of data per
sample. Two methods of data reduction are implemented by
compressing the 13–bit linear scheme to companded
pseudo–logarithmic 8–bit schemes. The two companding
schemes are: Mu–255 Law, primarily in North America and
Japan; and A–Law, primarily used in Europe. These com-
panding schemes are accepted world wide. These compand-
ing schemes follow a segmented or ‘‘piecewise–linear’’ curve
formatted as sign bit, three chord bits, and four step bits. For
a given chord, all sixteen of the steps have the same voltage
weighting. As the voltage of the analog input increases, the
four step bits increment and carry to the three chord bits
which increment. When the chord bits increment, the step
bits double their voltage weighting. This results in an effec-
tive resolution of six bits (sign + chord + four step bits) across
a 42 dB dynamic range (seven chords above 0, by 6 dB per
chord).
In a sampling environment, Nyquist theory says that to
properly sample a continuous signal, it must be sampled at a
frequency higher than twice the signal’s highest frequency
component. Voice contains spectral energy above 3 kHz, but
its absence is not detrimental to intelligibility. To reduce the
digital data rate, which is proportional to the sampling rate, a
sample rate of 8 kHz was adopted, consistent with a band-
width of 3 kHz. This sampling requires a low–pass filter to
limit the high frequency energy above 3 kHz from distorting
the in–band signal. The telephone line is also subject to
50/60 Hz power line coupling, which must be attenuated
from the signal by a high–pass filter before the analog–to–
digital converter.
The digital–to–analog conversion process reconstructs a
staircase version of the desired in–band signal, which has
spectral images of the in–band signal modulated about the
sample frequency and its harmonics. These spectral images
are called aliasing components, which need to be attenuated
to obtain the desired signal. The low–pass filter used to at-
tenuate these aliasing components is typically called a re-
construction or smoothing filter.
The MC145484 PCM Codec–Filter has the codec, both
presampling and reconstruction filters, and a precision volt-
age reference on–chip.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
AR
CH
IVE
D B
Y F
RE
ES
CA
LE
SE
MI
CO
ND
UC
TO
R,
INC
.
相关PDF资料 |
PDF描述 |
|---|---|
| MC33199DR2 | IC DRVR SER INK ISO9141 14-SOIC |
| MC33215BE | IC SPEAKERPHONE CIRCUIT 42-SDIP |
| MC33990DR2 | IC TRANSCEIVER J-1850 BUS 8-SOIC |
| MC34017A-3P | IC PHONE TONE RINGER 500HZ 8-DIP |
| MC34018DWR2 | IC SPEAKERPHONE VOICE SW 28-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC14N-S-10230AC | 制造商:IMO 功能描述:Contactor 3 Pole Open 5.5kW 14A AC3, 1 Normally Open Auxiliary, 230V AC Coil Ove |
| MC14-S-10110 | 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR 5.5KW 110VAC 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR 1NO 110VAC 14A D 制造商:IMO PRECISION CONTROLS 功能描述:CONTACTOR, 5.5KW, 110VAC 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR, 1NO, 110VAC, 14A, DIN RAIL; Operating Voltage:690VAC; Switching Power AC1:4kW; Switching Power AC3:7.5kW; Switching Current AC1:25A; Switching Current AC3:14A; Load Current Inductive:14A; Load Current Resistive:25A ;RoHS Compliant: Yes |
| MC14-S-10110 | 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR 4KW/10A 110VAC |
| MC14-S-10230 | 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR 5.5KW 230VAC 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR 1NO 230VAC 14A D 制造商:IMO PRECISION CONTROLS 功能描述:CONTACTOR, 5.5KW, 230VAC 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR, 1NO, 230VAC, 14A, DIN RAIL; Operating Voltage:690VAC; Switching Power AC1:4kW; Switching Power AC3:7.5kW; Switching Current AC1:25A; Switching Current AC3:14A; Load Current Inductive:14A; Load Current Resistive:25A ;RoHS Compliant: Yes |
| MC14-S-10230 | 制造商:IMO Precision Controls Ltd 功能描述:CONTACTOR 4KW/10A 230VAC |
发布紧急采购，3分钟左右您将得到回复。