MC145554P - 13-Bit PCM Codec-Filter | Motorola | Voice
MPN： MC145554P ✗ 停產MC145554P 概覽
A PCM codec-filter belongs to the audio codec and interface hierarchy, where it bridges linear analog audio and digital PCM telecommunications. The codec-filter concept combines signal conversion with frequency-domain filtering in one interface circuit. In a voice system, this integration can reduce the number of separate external filtering stages required around a codec while supporting the bandwidth and smoothing requirements associated with voice transmission.
The MC145554 family is designed for per-channel PCM signal processing. The MC145554P identifies the 16-pin plastic DIP configuration, while the 13-bit PCM interface resolution is listed for the exact MC145554P orderable device. Its primary engineering benefit is functional consolidation: analog-to-digital conversion, digital-to-analog reconstruction, band limiting, and smoothing are combined within a single voice-channel interface.
The codec-filter family operates with synchronous and asynchronous PCM systems. That flexibility makes the device relevant to telecommunications, voice processing, digital telephony, and embedded audio interfaces where the system clock arrangement differs between endpoints. Designers must still verify clocking, impedance, timing, and analog-interface requirements against the manufacturer datasheet before laying out a new circuit.
Typical applications include PCM voice terminals, digital telephone interfaces, speech-processing equipment, voice-band recorders, and telecommunications line-card signal paths. In these systems, the MC145554P provides the conversion boundary between an analog microphone or speaker path and a digital PCM processor. It is especially relevant when a compact single-channel implementation is preferable to separate codec and filter circuitry.
A key design consideration is that this is a legacy 16-pin DIP device rather than a modern mixed-signal package. PCB space, assembly method, analog grounding, clock cleanliness, and connector-level signal integrity therefore deserve attention. Reproduction of an existing design should preserve the original footprint, pin functions, timing assumptions, and external component values unless a validated cross-reference has been completed.
This product page consolidates the confirmed device identity, PCM interface information, package details, sourcing path, and design considerations into one engineering reference. It also distinguishes documented drop-in replacements from merely similar legacy codec-filter devices, helping engineers determine when PCB reuse is defensible and when a fresh design should use a newer codec architecture.
直接替換替代品，適用於 MC145554P — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品MC145554P 最大額定值與電氣特性
| Product Type | PCM codec-filter |
| PCM Resolution | 13 bits |
| Channel Architecture | Per channel |
| 封裝 | 16-pin plastic dual inline package |
| 腳位數 | 16 pins |
| 安裝類型 | Through-hole |
| Signal Conversion | Analog-to-digital and digital-to-analog PCM voice conversion |
| Filter Functions | Band limiting and smoothing |
| PCM Operating Mode | Synchronous or asynchronous operation |
MC145554P 16-pin plastic dual inline package 腳位配置指南
MC145554P（16-pin plastic dual inline package 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： MC145554P.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC145554P 適用於 6 應用s: Digital Telephony Voice Interface, PCM Voice Terminal Equipment, Speech Processing Front End, Voice-Band Recorder Interface, Telecommunications Line-Card Voice Path, Industrial Voice Control Module.
Digital Telephony Voice Interface
The MC145554P fits a single-channel digital telephony design that requires an analog microphone or line input, a 13-bit PCM conversion path, and an analog receive output. The codec-filter combines voice digitization, reconstruction, band limiting, and smoothing in one 16-pin DIP device. It is particularly useful when preserving a proven 16-pin legacy design is more practical than introducing a different codec architecture. Designers should verify channel format, clocking, analog levels, and line-interface requirements against the manufacturer datasheet before release.
PCM Voice Terminal Equipment
The MC145554P can serve as the voice conversion boundary in a terminal that accepts analog speech, converts it into 13-bit PCM data, and reconstructs analog audio from received PCM. Integrating band limiting and smoothing around the conversion functions can simplify a legacy voice-channel signal path. The 16-pin through-hole package is advantageous for repairable or low-volume equipment but consumes more PCB area than a modern surface-mount codec. Clock and power implementation must follow the datasheet exactly.
Speech Processing Front End
A speech-processing system can use the MC145554P to establish a digitized voice channel before samples enter a processor, DSP, or communications controller. Its 13-bit PCM format and integrated filtering make it appropriate for legacy speech-capture and playback designs where a proven codec-filter is already supported. Integration should account for analog input drive, output loading, clock jitter, and grounding. The device is most compelling in maintenance and reproduction projects rather than new low-power edge systems.
Voice-Band Recorder Interface
The MC145554P is applicable to a voice-band recording interface that digitizes an analog channel into 13-bit PCM data for storage or transmission and reconstructs playback audio. Combining digitization, reconstruction, band limiting, and smoothing reduces the number of separate stages surrounding the PCM converter. Because the MC145554P is a legacy through-hole device, mechanical availability and exact pin compatibility should be confirmed early. Record-path clocking and sample timing must match the storage controller requirements.
Telecommunications Line-Card Voice Path
The MC145554P can be used in a legacy line-card voice path where a single analog speech channel is exchanged with a digital PCM system. Its 13-bit conversion resolution, integrated band limiting, and smoothing support the classic PCM voice architecture. The 16-pin DIP footprint is suitable for through-hole line cards and repair-oriented systems. However, signal levels, impedance, timing, and loopback behavior must be checked against the original design, especially when adapting the circuit to a modern digital transport.
Industrial Voice Control Module
An industrial voice-control module may use the MC145554P when it requires a stable analog-to-PCM and PCM-to-analog interface for a one-channel command or status-audio path. The codec-filter's 13-bit PCM format and integrated smoothing can reduce external analog-processing blocks. It is best suited to legacy or long-lifecycle equipment where the DIP package and established interface behavior are advantageous. New modules with tighter size, power, safety, and lifecycle requirements should evaluate current audio codecs before committing to this architecture.
工程參考資料，適用於 MC145554P — 比較、設計指引及合規資訊。
選型指南
For a new design, compare the MC145554P with a current audio codec rather than assuming this legacy device is preferable. Modern codecs can offer smaller packages, lower power, wider data resolution, additional digital interfaces, and stronger current lifecycle support. If the original board must be reused, verify the package drawing, complete pin assignments, clock timing, analog levels, and external component values against the manufacturer datasheet. Do not approve a replacement solely because it has a similar family number or appears in a generic cross-reference result.
與替代品比較
| 參數 | 本產品 |
|---|---|
| Brand | Motorola |
| Package | 16-pin plastic dual inline package |
| Product Type | Per-channel PCM codec-filter |
| PCM Resolution | 13 bits |
| Conversion Functions | Voice digitization and reconstruction |
| Filtering Functions | Band limiting and smoothing |
| PCM Operating Mode | Synchronous or asynchronous |
| Mounting Type | Through-hole |
主要差異化特點
- Integrated conversion and filtering in one legacy voice interface (對比Discrete codec-and-filter signal chain)
- Supports two PCM clocking arrangements (對比Synchronous-only PCM codec implementations)
- Through-hole package supports repair-oriented assemblies (對比Surface-mount codec packages)
設計說明
Reproduce the analog signal path using the manufacturer application and connection diagrams, keeping the codec-filter and its associated passive components close to their assigned pins. Pay particular attention to analog-input and analog-output grounding because a 16-pin DIP provides limited pin space for independent returns. Validate the final trace geometry against the original design rather than assuming that a modern codec layout can be transferred directly.
Treat PCM clock, sync, and data routes as a coordinated timing interface. Use short traces, continuous reference planes, and termination or series damping only where supported by the original circuit and clock characteristics. Confirm input and output timing margins from the Motorola datasheet, and verify that the associated transmitter or controller uses a compatible voltage level. This is especially important when the MC145554P is combined with newer digital logic.
Do not treat MC145554L, MC145557, MC145564, or MC145567 as automatic drop-in replacements merely because they share the MC1455 family naming pattern. Before substituting any related codec-filter, compare package dimensions, every pin assignment, clock polarity, data timing, power requirements, and analog interface details. A footprint match alone is insufficient for a legacy mixed-signal interface.
合規資訊
The device is a legacy 13-bit PCM codec-filter in a 16-pin plastic DIP package. No current environmental or automotive qualification statement is established by the available manufacturer and distributor records.
