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參數(shù)資料
| 型號： | MC145481 |
| 廠商： | Motorola, Inc. |
| 元件分類： | Codec |
| 英文描述： | 3 V PCM Codec-Filter |
| 中文描述： | 3伏的PCM編解碼器，過濾器 |
| 文件頁數(shù)： | 1/23頁 |
| 文件大?。?/td> | 316K |
| 代理商： | MC145481 |
MC145481
MOTOROLA
1
Product Preview
The MC145481 is a general purpose per channel PCM Codec–Filter with pin
selectable Mu–Law or A–Law companding, and is offered in 20–pin 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 on–chip precision reference voltage.
This device has an input operational amplifier whose output is the input to the
encoder section. The encoder section immediately low–pass filters the analog
signal with an active R–C filter to eliminate very high frequency noise from being
modulated down to the passband by the switched capacitor filter. From the
active R–C 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–ended
design, which reduces the significance of noise to both the inverted and
non–inverted signal paths. Another advantage of this differential design is that
noise injected via the power supplies is a common–mode signal that is
cancelled when the inverted and non–inverted 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–pass filtered at 3400 Hz and sinX/X
compensated by a differential switched capacitor filter. The signal is then filtered
by an active R–C filter to eliminate the out–of–band energy of the switched
capacitor filter.
The MC145481 PCM Codec–Filter has a high impedance VAG reference pin
which allows for decoupling of the internal circuitry that generates the
mid–supply 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 MC145481 PCM Codec–Filter accepts a variety of clock formats,
including Short Frame Sync, Long Frame Sync, IDL, and GCI timing
environments. This device also maintains compatibility with Motorola’s family of
Telecommunication products, including the MC14LC5472 and MC145572
U–Interface Transceivers, MC145474/75 and MC145574 S/T–Interface Trans-
ceivers, MC145532 ADPCM Transcoder, MC145422/26 UDLT–1,
MC145421/25 UDLT–2, and MC3419/MC33120 SLICs.
The MC145481 PCM Codec–Filter utilizes CMOS due to its reliable
low–power performance and proven capability for complex analog/digital VLSI
functions.
Single 2.7 to 5.25 V Power Supply
Typical Power Dissipation of 8 mW @ 3 V, Power–Down of 0.01 mW
Fully–Differential Analog Circuit Design for Lowest Noise
Transmit Band–Pass and Receive Low–Pass Filters On–Chip
Active R–C Pre–Filtering and Post–Filtering
Mu–Law and A–Law Companding by Pin Selection
On–Chip Precision Reference Voltage of 0.886 V for a – 5 dBm TLP
@ 600
Push–Pull 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 MC145481/D
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
DW SUFFIX
SOG PACKAGE
CASE 751D
ORDERING INFORMATION
MC145481DW
MC145481SD
SOG Package
SSOP
20
1
VDD
PO–
PI
RO–
VAG Ref
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
SD SUFFIX
SSOP
CASE 940C
20
1
REV 1
7/96
相關PDF資料 |
PDF描述 |
|---|---|
| MC145481DW | 3 V PCM Codec-Filter |
| MC145481SD | 3 V PCM Codec-Filter |
| MC145482DW | 5 V 13-Bit Linear PCM Codec-Filter |
| MC145482 | 5 V 13-Bit Linear PCM Codec-Filter |
| MC145482SD | 5 V 13-Bit Linear PCM Codec-Filter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC145481DT | 功能描述:IC PCM CODEC-FILTER 3V 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調變:是 S/N 比，標準 ADC / DAC (db):81.5 / 88 動態(tài)范圍，標準 ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
| MC145481DW | 功能描述:IC CODEC-FILTER PCM 3V 20-SOIC W RoHS:否 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調變:是 S/N 比，標準 ADC / DAC (db):81.5 / 88 動態(tài)范圍，標準 ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
| MC145481EG | 功能描述:IC CODEC-FILTER PCM 3V 20-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調變:是 S/N 比，標準 ADC / DAC (db):81.5 / 88 動態(tài)范圍，標準 ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
| MC145481EGR2 | 功能描述:IC CODEC-FILTER PCM 3V 20-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調變:是 S/N 比，標準 ADC / DAC (db):81.5 / 88 動態(tài)范圍，標準 ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
| MC145481EJ | 功能描述:IC CODEC-FILTER PCM 3V 20-TSSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調變:是 S/N 比，標準 ADC / DAC (db):81.5 / 88 動態(tài)范圍，標準 ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
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