PCM1801U - 16-Bit Stereo Audio ADC | Texas Instruments
N.º da peça: PCM1801U ✓ AtivoPCM1801U Visão geral
An audio ADC is a mixed-signal semiconductor that converts left- and right-channel analog voltages into digital sample data for processing, storage, or transmission. The PCM1801 belongs to the ADC and DAC hierarchy, uses a delta-sigma modulator and digital decimation filter, and supports slave-mode operation with two serial data formats. This architecture provides a practical bridge between analog audio sources and digital audio systems.
Key features include dual 16-bit monolithic conversion channels, single-ended analog voltage inputs, 64-times oversampling, a 48 kSPS maximum sampling rate, and a serial output interface. The decimation filter has a specified passband ripple of ±0.05 dB and stopband attenuation of -65 dB. Typical signal-chain performance includes THD+N of -88 dB, SNR of 93 dB, and dynamic range of 93 dB.
Internally, the PCM1801 uses a delta-sigma modulator followed by a digital decimation filter to reduce aliasing and shape quantization noise. Its serial interface supports slave operation and two data formats, giving the system designer flexibility in clocking and data framing. The single-ended inputs simplify source interfacing, although input filtering, grounding, and source impedance remain critical to achieving the stated audio performance.
Typical uses include consumer digital audio equipment, stereo recording products, USB audio interfaces, set-top boxes, and other compact audio systems requiring two analog inputs and a serial digital interface. The 48 kSPS rate aligns with standard CD-rate audio, while the 14-pin SOIC package simplifies assembly in cost-sensitive designs.
When laying out the circuit, place input and decoupling capacitors close to their associated pins, maintain a low-impedance ground return for the analog section, and route serial clock and data traces away from sensitive analog inputs. Verify the external interface voltage levels and serial timing before connecting the converter to a host processor.
This product page consolidates verified manufacturer and distributor information, price context, package details, application guidance, and substitution limitations. It distinguishes documented specifications from missing data and avoids presenting electrically different converters as guaranteed drop-in replacements.
Alternativas drop-in para PCM1801U — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PCM1801U (mesmo formato e footprint) — diferindo em Digital Interface, Package.
PCM1725U
✅ Drop-InConsulte o preço
Ver ficha técnica →PCM1801U Classificações máximas e características elétricas
| ADC Type | Delta-sigma audio ADC |
| Resolução | 16 bit |
| Channel Configuration | Dual-channel stereo |
| Input Type | Single-ended analog voltage input |
| Taxa de amostragem | 48 kSPS |
| Oversampling Ratio | 64 times |
| THD+N | -88 dB typical |
| SNR | 93 dB typical |
| Dynamic Range | 93 dB typical |
| Decimation Filter Passband Ripple | ±0.05 dB |
| Decimation Filter Stopband Attenuation | -65 dB |
| Digital Interface | Serial, slave mode, two data formats |
| Tensão de alimentação | 4.5 V |
| Encapsulamento | 14-pin SOIC |
| Tipo de montagem | Surface mount |
| Terminal Count | 14 terminals |
Guia de Configuração de Pinos do PCM1801U 14-pin soic
Configuração de pinos para PCM1801U (pacote 14-pin soic). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para PCM1801U.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
PCM1801U é adequado para 6 aplicaçãos: Consumer Digital Audio Equipment, Stereo Recording and Playback Products, USB Audio Interface, Set-Top Box Audio Capture, Digital Audio Instrument Front End, Audio Conversion Learning Platform.
Consumer Digital Audio Equipment
PCM1801U fits cost-sensitive stereo audio products that require two single-ended analog inputs and 16-bit conversion at 48 kSPS. Its 64-times oversampling and digital decimation filter provide the core conversion function, while typical 93 dB SNR and -88 dB THD+N establish useful performance targets for consumer playback, recording, and signal-conversion equipment. The device is placed between the analog source and a digital audio controller, with the serial interface operating in slave mode. Designers should preserve the recommended decoupling and analog grounding arrangement because converter performance depends as much on input conditioning and layout as on the converter itself.
Recomendado
Stereo Recording and Playback Products
PCM1801U is suitable for compact stereo recording or playback products requiring two single-ended analog channels and standard 48 kSPS conversion. The converter's 16-bit resolution, 93 dB typical SNR, and 93 dB typical dynamic range align with cost-sensitive consumer audio paths, while its two serial data formats allow the host interface to match system timing. In a typical signal chain, the source is buffered, the PCM1801U performs conversion, and the resulting serial samples are transferred to an audio processor. Verify input full-scale voltage, master-clock requirements, and serial timing against the system controller before layout release.
Recomendado
USB Audio Interface
PCM1801U can provide the stereo analog-to-digital front end of a USB audio interface when the USB controller accepts a slave-mode serial stream and the product targets 48 kSPS, 16-bit audio. Its 64-times oversampling and digital decimation filter support anti-aliasing and noise shaping, and typical 93 dB SNR provides a practical baseline for a consumer USB interface. The PCM1801U does not implement USB itself, so the design still requires a suitable USB audio controller and clock architecture. Keep the analog input path short, isolate it from digital return currents, and confirm all serial timing parameters before production.
Recomendado
Set-Top Box Audio Capture
PCM1801U can support analog audio capture in a set-top box or similar consumer media device when two single-ended sources must be converted to digital 48 kSPS data. The 16-bit converter, 64-times oversampling architecture, and slave-mode serial output suit compact cost-sensitive implementations. A practical design can route buffered analog signals into the two converter inputs and send the serial output to the box's audio processor. The converter's documented operating supply is 4.5 V, so the board must provide a compatible analog supply and suitable decoupling. Component placement should prioritize clean analog grounding and short input routes to preserve the expected 93 dB typical SNR.
Recomendado
Digital Audio Instrument Front End
PCM1801U is applicable to a cost-sensitive digital audio measurement front end when 48 kSPS, 16-bit resolution, and single-ended stereo inputs are adequate. Its typical -88 dB THD+N and 93 dB SNR provide concrete limits for evaluating source and preamplifier performance. The converter captures two buffered analog channels and sends the samples to a digital processor for display, storage, or analysis. For best results, use a low-noise input stage, account for the converter's full-scale input range, and establish a repeatable reference excitation. Calibration and anti-alias filtering must be designed around the converter's specified bandwidth and conversion architecture.
Recomendado
Audio Conversion Learning Platform
PCM1801U works well in an educational platform designed to demonstrate stereo audio conversion, digital filtering, and serial data transfer. Its 48 kSPS sampling rate, 16-bit output, and two data formats make the digital stream accessible to students and hobbyists, while the 14-pin SOIC package is straightforward to prototype. The board can accept two single-ended analog inputs, pass the serial samples to a microcontroller or development module, and display waveform or spectrum results. Because the converter has no USB interface, the host platform must supply clocks and decode the serial output. Good grounding and short analog traces remain important even in a demonstration design.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PCM1801U — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PCM1725U |
|---|---|---|
| Package | 14-SOIC | 14-SOIC |
| Brand | Texas Instruments | Texas Instruments |
Principais diferenciais
- Documented 16-bit stereo conversion at the standard 48 kSPS audio rate (vs PCM1725U)
- Single-ended dual-channel input architecture (vs PCM1725U)
- Integrated 64-times oversampling and digital decimation filtering (vs PCM1725U)
Notas de projeto
Place all input, reference, supply, and decoupling components according to the manufacturer application diagram, keeping analog traces short and separating them from serial clock and data routing. The PCM1801U uses 64-times oversampling, but system clock noise can still affect conversion performance. Use a continuous ground reference for the analog section, minimize loop area around decoupling capacitors, and avoid running digital return currents beneath the converter's analog inputs. PCB changes should be evaluated against the manufacturer's recommended layout rather than inferred only from the block diagram.
Design the analog input path for the converter's 48 kSPS operating rate and specified input range. If the source has significant impedance, include suitable buffering and ensure that the active circuit can drive the effective input capacitance without introducing excessive gain error. The verified typical SNR is 93 dB and THD+N is -88 dB, but those figures do not remove the sensitivity of a delta-sigma audio ADC to poor grounding, source impedance, or insufficient anti-alias filtering. Establish signal amplitudes and bandwidth during schematic review rather than assuming every line-level source will achieve the characterized performance.
Do not treat the PCM1801U as a USB audio interface: the device provides a slave-mode serial output, so clock generation, data capture, framing, and USB protocol handling must be implemented elsewhere. Verify which of the two supported data formats the host expects and confirm reset behavior before enabling signal-path converters. Also avoid assuming that another 14-pin audio ADC is interchangeable merely because its package matches; review every analog, reference, clock, and serial pin in the complete manufacturer datasheet before approving a substitution.
Informações de conformidade
The supplied verified excerpts do not explicitly state PCM1801U compliance declarations. These fields remain unknown rather than being inferred from manufacturer authorship, package construction, or distributor availability.