PCM1702U - 20-Bit 44.1kHz Audio DAC | Texas Instruments
N.º de pieza: PCM1702U ✗ Fin de vidaPCM1702U Descripción general
A digital-to-analog converter, or DAC, converts digital audio samples into an analog voltage or current that can drive downstream amplifiers, headphones, mixers, or loudspeaker systems. Within the broader component hierarchy, the PCM1702U is an audio DAC, a member of the data-converter family, and ultimately a semiconductor designed to bridge digital signal-processing systems with analog audio outputs.
The principal feature of the PCM1702U is its advanced sign-magnitude architecture, which is designed to suppress unwanted glitches and nonlinear transitions around bipolar zero. The manufacturer datasheet also identifies an industry-standard serial interface, 20-bit resolution, and low-noise performance. Its -96 dB typical THD+N is specified with a full-scale output and without external adjustment, indicating that the core distortion performance does not depend on a user-supplied trim procedure.
The device combines a BiCMOS implementation with a fast-settling output architecture. These characteristics are relevant when converting sequential digital audio data into a smooth analog waveform, particularly near zero crossings where conventional converter architectures may exhibit glitching. The serial format supports integration with digital audio processors while the analog output is intended for subsequent signal conditioning rather than direct loudspeaker drive.
Typical uses include CD-player and digital-audio source designs, professional audio interface signal paths, digital mixing consoles, sampling systems, and other equipment requiring a high-resolution DAC. The 44.1 kHz capability directly matches the standard rate used by CD audio, while higher-rate source equipment can use the converter only if its upstream clocking and filtering architecture permits the intended operating rate.
Designers should preserve the required analog and digital supply arrangements, use suitable output coupling or load circuitry, and validate the complete signal path rather than relying only on the converter's headline distortion figure. The verified excerpts do not provide the complete pin names, output mode, voltage references, supply limits, or recommended application circuit, so those implementation details must be confirmed in the manufacturer datasheet before layout.
This page combines verified manufacturer-datasheet characteristics, distributor metadata, lifecycle information, application guidance, and drop-in alternatives into an engineering-focused selection reference. It also clearly identifies unavailable parameters instead of estimating them, allowing designers to distinguish documented performance from information that still requires circuit-level verification.
Alternativas directas para PCM1702U — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
PCM1702U-K/2K
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PCM1702U-K/2KE6
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PCM1702U-J
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PCM1702U Valores máximos y características eléctricas
| Converter Type | Audio digital-to-analog converter |
| Resolución | 20 bit |
| Frecuencia de muestreo | 44.1 kHz |
| Architecture | Advanced sign-magnitude BiCMOS |
| Total Harmonic Distortion plus Noise | -96 dB typ at full-scale output |
| External Adjustment Requirement | None required |
| Signal-to-Noise Ratio | 120 dB typ A-weighted |
| Tipo de interfaz | Industry-standard serial |
| Zero-Crossing Behavior | Glitch-free output |
| Output Settling | Fast-settling architecture |
| Encapsulado | SOIC-20 (20-SO) |
| Tipo de montaje | Surface mount |
| Termination | Gull wing |
Guía de configuración de pines de PCM1702U soic-20 (20-so)
Configuración de pines para PCM1702U (encapsulado soic-20 (20-so)). 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 PCM1702U.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
PCM1702U es adecuado para 6 aplicacións: CD Player Digital-to-Analog Conversion, Professional Audio Interface Output, Digital Mixing Console Output Stage, Digital Audio Sampling System, Digital-Audio Source and Media Player, Precision Audio Measurement Equipment.
CD Player Digital-to-Analog Conversion
The PCM1702U fits a CD-player conversion path because its documented 44.1 kHz sampling rate matches the standard used by CD audio. Its 20-bit resolution, -96 dB typical full-scale THD+N, and 120 dB typical A-weighted SNR provide a strong basis for a low-distortion analog output stage. The Texas Instruments datasheet describes glitch-free operation around bipolar zero, which is valuable when the serial stream contains transitions near silence. In practice, the PCM1702U should sit between the CD transport or digital audio processor and a suitable reconstruction, coupling, and amplification circuit. The complete clock, supply, and analog-output implementation must be taken from the manufacturer application guidance rather than inferred from the available summary.
Professional Audio Interface Output
The PCM1702U is suitable for a professional audio interface output channel where 20-bit conversion and low-noise performance are important. Its 120 dB typical A-weighted SNR, -96 dB typical full-scale THD+N, and glitch-free sign-magnitude output support accurate reconstruction of digital program material before balanced or unbalanced analog amplification. The 44.1 kHz rating aligns directly with CD-rate sources, although the broader clock architecture determines which additional rates can be supported. Engineers must still design low-noise analog supplies, output filtering, and the required gain stage around the DAC. Because the supplied excerpts do not include the complete reference circuit or output-current limits, those values must be verified in the manufacturer datasheet.
Digital Mixing Console Output Stage
The PCM1702U can serve as a high-resolution conversion element in a digital mixing console or digital audio mixer. Its 20-bit data resolution preserves low-level program detail, while the documented -96 dB typical full-scale THD+N and 120 dB typical A-weighted SNR reduce conversion-related degradation in the analog output path. The advanced sign-magnitude architecture is particularly relevant for avoiding glitches around bipolar zero, where music and speech transitions may occur frequently. A practical implementation would use the serial interface for transfer from the console's digital processing engine and place the converter near the analog summing and drive circuitry. The supported 44.1 kHz rate must be reconciled with the console's clock architecture, and load compatibility should be verified before release.
Digital Audio Sampling System
For a sampling system, the PCM1702U provides a 20-bit, 44.1 kHz conversion path aimed at preserving recorded audio data with low distortion and noise. The -96 dB typical full-scale THD+N and 120 dB typical A-weighted SNR support high-fidelity monitoring or playback conversion, while fast settling helps the analog output follow sequential digital samples accurately. In a working system, the converter can receive PCM data from a digital audio engine and feed a carefully bypassed analog output stage. Clock synchronization is critical because source-rate conversion, sample-rate mismatch, or poorly isolated clock routing can degrade performance even when the converter's intrinsic specifications are strong. Exact input timing, filter requirements, and permissible loading remain unverified in the supplied excerpts.
Digital-Audio Source and Media Player
The PCM1702U is applicable to a digital-audio source that accepts serial PCM and produces an analog line-level signal. Its 44.1 kHz sampling rate directly supports standard CD-rate playback, while its 20-bit resolution, -96 dB typical THD+N, and 120 dB typical A-weighted SNR are suited to high-quality source equipment. The manufacturer datasheet's glitch-free output behavior around bipolar zero can improve perceived channel-to-channel and transition consistency when the source is carefully implemented. The device should be paired with a stable clock, low-noise supplies, suitable output coupling, and an output amplifier. Because channel count, output configuration, and reference circuitry are not included in the supplied excerpts, those details must be confirmed directly from the full Texas Instruments document.
Precision Audio Measurement Equipment
The PCM1702U can serve in precision audio measurement equipment when a 44.1 kHz, 20-bit conversion function is sufficient. Its -96 dB typical full-scale THD+N provides documented low-distortion behavior, while the 120 dB typical A-weighted SNR supports high-resolution analysis of captured or generated signals. The fast-settling output may be useful when measuring systems with short-duration or transient content. Measurement accuracy still depends on the analog front end, clock quality, grounding, excitation source, calibration procedure, and analyzer bandwidth. A-weighted SNR must not be mixed with an unweighted noise figure when setting test limits. Because the supplied data does not state the converter's output topology, reference voltage, or permitted loading, the measurement fixture should be designed only after those details are verified.
Datos de referencia de ingeniería para PCM1702U — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PCM1702U-K/2K | PCM1702U-K/2KE6 | PCM1702U-J |
|---|---|---|---|---|
| Package | SOIC-20 (20-SO) | SOIC-20 (20-SO) | SOIC-20 (20-SO) | SOIC-20 (20-SO) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 20 bit | 20 bit | 20 bit | 20 bit |
| Sampling Rate | 44.1 kHz | 44.1 kHz | 44.1 kHz | 44.1 kHz |
| THD+N | -96 dB typ at full-scale output | -96 dB typ at full-scale output | -96 dB typ at full-scale output | -96 dB typ at full-scale output |
| SNR | 120 dB typ A-weighted | 120 dB typ A-weighted | 120 dB typ A-weighted | 120 dB typ A-weighted |
| Architecture | Advanced sign-magnitude BiCMOS | Advanced sign-magnitude BiCMOS | Advanced sign-magnitude BiCMOS | Advanced sign-magnitude BiCMOS |
| Interface | Industry-standard serial | Industry-standard serial | Industry-standard serial | Industry-standard serial |
| External Adjustment | Not required | Not required | Not required | Not required |
Diferenciadores clave
- Documented low-distortion full-scale operation (frente a PCM1702U-K/2K)
- High A-weighted signal-to-noise ratio (frente a PCM1702U-K/2KE6)
- Glitch-free sign-magnitude output behavior (frente a PCM1702U-J)
Notas de diseño
Keep the PCM1702U's digital interface traces away from the analog output and reference paths, and place the device according to the complete Texas Instruments application layout. The supplied excerpts do not contain the pin table, so engineers must not infer clock, data, power, or analog-output assignments from the 20-pin count. Confirm differential or single-ended routing, return paths, and exposed copper requirements from the authoritative datasheet before releasing the PCB.
Treat analog and digital supply conditioning as part of the converter design rather than assuming the -96 dB typical THD+N figure applies to every implementation. The available manufacturer summary does not state supply voltages, current limits, or decoupling values, so use the full datasheet for capacitor selection and placement. Place required high-frequency bypass capacitors adjacent to the relevant supply pins and keep supply-return paths short to limit switching noise and ground bounce.
Preserve clock and serial-data timing because the PCM1702U's documented conversion performance assumes valid data and clock relationships. The supplied excerpts do not provide setup time, hold time, edge-rate limits, jitter sensitivity, or maximum input frequency. Use the manufacturer timing diagram to set source-device timing margins and route clock and data as a controlled group. Avoid adding unnecessary long stubs or test-point discontinuities near sensitive digital inputs.
Información de cumplimiento
The supplied excerpts do not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable to this conventional audio DAC because no automotive qualification evidence is provided.
