HOME在庫検索>在庫情報

部品型式

MC145484DW

製品説明
仕様・特性

MOTOROLA Order this document by MC145484/D SEMICONDUCTOR TECHNICAL DATA MC145484 5 V PCM Codec-Filter The MC145484 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, SSOP, and TSSOP 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 MC145484 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. This device is optimal for electronic SLIC interfaces. The MC145484 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 Transc e i v e r s , M C 1 4 5 5 3 2 A D P C M Tr a n s c o d e r, M C 1 4 5 4 2 2 / 2 6 U D LT – 1 , MC145421/25 UDLT–2, and MC3419/MC33120 SLICs. The MC145484 PCM Codec–Filter utilizes CMOS due to its reliable low–power performance and proven capability for complex analog/digital VLSI functions. • • • • • • • • • DW SUFFIX SOG PACKAGE CASE 751D 20 1 SD SUFFIX SSOP CASE 940C 20 1 DT SUFFIX TSSOP CASE 948E 20 1 ORDERING INFORMATION MC145484DW MC145484SD MC145484DT SOG Package SSOP TSSOP PIN ASSIGNMENT VAG Ref 1 20 VAG RO- 2 19 TI+ PI 3 18 TI- PO- 4 17 TG PO+ 5 16 Mu/A VDD 6 15 VSS FSR 7 14 FST DR 8 13 DT 9 12 BCLKT 10 11 MCLK BCLKR PDI Single 5 V Power Supply Typical Power Dissipation of 15 mW, 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 1.575 V for a – 0 dBm TLP @ 600 Ω Push–Pull 300 Ω Power Drivers with External Gain Adjust MC14LC5480EVK is the Evaluation Kit for This Device REV 2 3/98 TN98031100 © Motorola, Inc. 1998 MOTOROLA MC145484 1

ブランド

MOT

現況

1999年8月4日、ディスクリート・標準アナログ・標準ロジックなどの半導体部門をオン・セミコンダクターとして分社化した。これは、イリジウムコミュニケーションズ倒産の損失をカバーするために分社化された。

会社名

ON Semiconductor

本社国名

U.S.A

事業概要

オン・セミコンダクターの前身は、モトローラ社の半導体コンポーネント・グループであり、モトローラ社のディスクリート、標準アナログ、標準ロジック・デバイスを継続して製造。

供給状況

 
Not pic File
お探し製品MC145484DWは、clevertechの担当が在庫調査を行いemailにて見積回答致します。

「見積依頼」ボタンを押してお気軽にお進み下さい。

お支払方法

宅配業者の代金引換又は商品到着後一週間以内の銀行振込となります。


お取引内容はこちら

0.0621099472