MC145505P - 13-Bit Mono PCM Codec-Filter | Motorola
N.º de pieza: MC145505P ✗ Fin de vidaMC145505P Descripción general
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.
Alternativas directas para MC145505P — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC145505P (mismo factor de forma y huella) — difiere en Channel Count.
No hay alternativas directas disponibles para este producto.
Solicitar alternativasMC145505P Valores máximos y características eléctricas
| Device Type | PCM codec-filter mono-circuit |
| PCM Resolution | 13 bit |
| Channel Count | 1 channel |
| Supported Companding | A-law and mu-law |
| Encapsulado | 16-pin PDIP |
| Recuento de pines | 16 pins |
| Tipo de montaje | Through-hole |
| Rango de temperatura de funcionamiento | -40°C to +85°C |
| Product Family | MC145502, MC145503 and MC145505 |
| Lifecycle Classification | Legacy device |
Guía de configuración de pines de MC145505P 16-pin pdip
Configuración de pines para MC145505P (encapsulado 16-pin pdip). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para MC145505P.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MC145505P es adecuado para 6 aplicacións: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC145505P — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| 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 |
Diferenciadores clave
- Dedicated 13-bit mono PCM codec-filter function (frente a MC145502)
- Legacy-compatible 16-pin PDIP construction (frente a MC145503)
- Specified industrial temperature coverage (frente a Modern compact PCM converters)
Notas de diseño
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.
Información de cumplimiento
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.