MC145505P - 13-Bit Mono PCM Codec-Filter | Motorola
MPN： MC145505P ✗ 停產MC145505P 概覽
A PCM codec-filter is an interface IC that converts between analog voice-band audio and digital PCM streams. The MC145505 family combines a codec and filter in one circuit, reducing the component count required by a traditional telecommunications or audio interface. It belongs to the broader hierarchy of audio codec, interface IC, ADC/DAC, and signal-processing semiconductor families.
The MC145505P is identified as a mono PCM codec-filter supporting A-law and mu-law coding. The 13-bit PCM format is suitable for speech-oriented systems requiring one digital voice channel, while the integrated filter function helps condition the analog audio path. The device is supplied in a through-hole PDIP package, making it suitable for legacy telecommunications equipment, voice-processing systems, and industrial control products assembled with conventional through-hole methods.
Technically, the MC145505P belongs to the legacy MC145502, MC145503, and MC145505 family of per-channel PCM codec-filter mono-circuits. The model suffix “P” identifies the PDIP package option shown in the product listings. Because this is a mature legacy interface device, system-level verification should emphasize clocking, analog signal levels, timing, and PCB compatibility rather than assuming that every newer codec has the same analog interface or control arrangement.
Typical applications include single-channel digital telephony, pulse-code-modulation voice terminals, audio recording and playback modules, speech-capture equipment, and industrial voice panels. In these systems, the codec-filter can reduce the number of separate conversion and filtering blocks while preserving compatibility with A-law or mu-law PCM channels.
Before replacing an existing design, compare the complete pin description, supply requirements, clock interface, and analog signal path in the manufacturer datasheet. The MC145505P cannot be treated as a generic modern audio ADC or DAC substitute because its PCM framing, companding format, timing, and legacy control interface are application-specific.
This product record combines the manufacturer-family description, package and temperature information, lifecycle classification, source links, and design-focused guidance. It also clearly distinguishes verified device characteristics from parameters that require confirmation in the original design documentation.
直接替換替代品，適用於 MC145505P — 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。
此系列的變體
與下列產品可直接替換的同系列型號： MC145505P （相同外形與佔位） — 差異在於 Channel Count.
此產品無可直接替換的替代品。
申請替代品MC145505P 最大額定值與電氣特性
| Device Type | PCM codec-filter mono-circuit |
| PCM Resolution | 13 bit |
| Channel Count | 1 channel |
| Supported Companding | A-law and mu-law |
| 封裝 | 16-pin PDIP |
| 腳位數 | 16 pins |
| 安裝類型 | Through-hole |
| 工作溫度範圍 | -40°C to +85°C |
| Product Family | MC145502, MC145503 and MC145505 |
| Lifecycle Classification | Legacy device |
MC145505P 16-pin pdip 腳位配置指南
MC145505P（16-pin pdip 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： MC145505P.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC145505P 適用於 6 應用s: Legacy Digital Telephony, Single-Channel Speech Capture, PCM Voice Terminal, Industrial Voice Panel, Legacy Audio Recording Module, Telecommunications Test Equipment.
Legacy Digital Telephony
The MC145505P fits a single-channel digital telephone design that uses 13-bit A-law or mu-law PCM. It combines a mono PCM codec and filter in one 16-pin PDIP device, allowing a legacy line interface to retain the established pulse-code-modulation format without duplicating separate conversion blocks. The single-channel architecture is appropriate for one voice path rather than conference or multichannel mixing systems. When using the part in a telephone design, verify the clock source, frame timing, companding polarity, analog line levels, and every pin assignment in the manufacturer datasheet. Its -40°C to +85°C operating range supports industrial and telecommunications environments, but legacy-product availability and lifecycle should be confirmed before new deployment.
推薦
Single-Channel Speech Capture
The MC145505P can support a speech-capture module that produces one 13-bit digital PCM stream using A-law or mu-law coding. Its integrated codec-filter function is useful when the system must combine analog voice conditioning and PCM conversion in a legacy through-hole design. One device handles the mono path, while the host processor or communications controller handles framing, storage, or transmission. For reliable deployment, calculate the required clock and frame cadence, confirm signal amplitude against the analog input limits, and use the manufacturer timing diagrams to define sampling and synchronization. Because this is a legacy component rather than a current USB or I2S audio codec, the surrounding processor must provide compatible PCM and clocking resources.
推薦
PCM Voice Terminal
The MC145505P is appropriate for a dedicated PCM voice terminal that connects one analog microphone or line-level voice source to a digital communications controller. Its 13-bit resolution, mono format, and A-law or mu-law support align with classic telecommunications signaling rather than high-resolution stereo playback. The 16-pin PDIP package permits assembly into through-hole or mixed-technology control boards. Implement the device only after matching the host controller’s bit rate, data timing, synchronization, and companding requirements to the datasheet. The analog section also needs board-level attention because external component values, grounding, and signal levels determine practical voice quality. The MCU controls buffering, packetization, status reporting, and system power sequencing.
推薦
Industrial Voice Panel
The MC145505P can be used in an industrial voice panel that converts one operator-audio channel into a compact PCM data stream for a controller. Its -40°C to +85°C operating range is useful when the equipment must operate across typical industrial ambient conditions, although the complete enclosure and thermal design still require validation. The single-channel A-law or mu-law output is well suited to messaging, intercom, and annunciator systems that prioritize speech intelligibility and legacy controller compatibility. The design should isolate the analog input from switching noise, follow the recommended decoupling arrangement, and isolate the PCM clock path from high-current loads. Confirm pin availability and timing margins against the manufacturer datasheet before committing the PCB layout.
推薦
Legacy Audio Recording Module
The MC145505P can serve as the mono recording interface in equipment designed around 13-bit A-law or mu-law PCM storage. It simplifies a design by combining codec and filter functions instead of requiring separate conversion stages. This architecture is particularly relevant to maintenance of industrial recorders, telemetry equipment, and voice-monitoring systems built around legacy processors. The recording system must implement the expected clock and frame format, while the board designer must preserve adequate analog grounding and filtering. Since the device does not present a modern I2S, USB, or I2C interface, storage control and file handling remain the responsibility of the host processor. Verify the complete analog gain, bandwidth, distortion, and timing characteristics before using the part in a new design.
推薦
Telecommunications Test Equipment
The MC145505P is useful in legacy telecommunications test equipment that must exercise 13-bit mono A-law or mu-law PCM channels. Its single-channel codec-filter architecture allows a tester to connect an analog voice condition to a communications controller and observe or generate PCM data at the system level. This application requires careful treatment of clocking and timing because incorrect framing can appear as analog noise, synchronization failure, or intermittent data corruption. Keep the PCM route short, use a stable clock source, and observe the manufacturer’s input and output circuit recommendations. The -40°C to +85°C range supports controlled laboratory and industrial test environments. For new platform instrumentation, evaluate current codecs as well when their test requirements can be met more easily.
推薦
推薦產品摘要
工程參考資料，適用於 MC145505P — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Device Type | PCM codec-filter mono-circuit |
| PCM Resolution | 13 bit |
| Channel Count | 1 channel |
| Companding Format | A-law and mu-law |
| Package | 16-pin PDIP |
| Brand | Motorola |
| Operating Temperature | -40°C to +85°C |
| Lifecycle Classification | Legacy device |
| Mounting Style | Through-hole |
主要差異化特點
- Dedicated 13-bit mono PCM codec-filter function (對比MC145502)
- Legacy-compatible 16-pin PDIP construction (對比MC145503)
- Specified industrial temperature coverage (對比Modern compact PCM converters)
設計說明
Do not treat another member of the MC145502, MC145503, and MC145505 family as a substitute without comparing the complete pin description and timing diagrams. Family membership confirms a common product category, but it does not guarantee identical clocking, filtering, companding, or control behavior. For a replacement decision, create a side-by-side table covering all 16 pins, supply requirements, clock inputs, analog impedance, PCM format, and signal timing.
Place the decoupling components and analog-support network close to their associated pins, and keep the PCM clock and data routes away from switching nodes and high-current return paths. Use a solid ground reference under the PDIP footprint where the board construction permits. Because the MC145505P combines analog and digital functions, maintaining a low-impedance ground return and separating noisy clock sources from the analog input area can reduce signal-integrity problems that appear as channel noise or intermittent framing errors.
Validate the actual supply voltage, input current, and power dissipation against the electrical characteristics in the manufacturer datasheet before enabling the analog path. The published 13-bit PCM and -40°C to +85°C operating range does not by itself establish safe supply or current limits for every operating condition. Check the processor and codec rails for sequencing conflicts, allow the device to stabilize according to the timing requirements, and avoid unnecessary always-on power in systems where legacy standby behavior is not acceptable.
Define PCM bit timing from the controller and verify sampling edge, frame cadence, and companding format at the actual board level. An incorrect clock relationship can produce corrupted audio even when every visible connection appears correct. Include worst-case clock tolerance and trace loading in the timing budget, and use the manufacturer application circuit as the baseline for analog input conditioning, output loading, and external filter values.
合規資訊
The device documentation identifies MC145505P as a legacy 13-bit mono PCM codec-filter in a 16-pin PDIP package, but it does not provide the compliance statements required for this field.