PCM1801U - 16-Bit Stereo Audio ADC | Texas Instruments
部品番号: PCM1801U ✓ 生産中PCM1801U 概要
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.
ドロップイン代替品: PCM1801U — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: PCM1801U （同一形状・フットプリント） — 相違点: Digital Interface, Package.
PCM1725U
✅ ドロップイン価格はお問い合わせください
データシートを見る →PCM1801U 最大定格＆電気的特性
| ADC Type | Delta-sigma audio ADC |
| 分解能 | 16 bit |
| Channel Configuration | Dual-channel stereo |
| Input Type | Single-ended analog voltage input |
| サンプリングレート | 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 |
| 電源電圧 | 4.5 V |
| パッケージ | 14-pin SOIC |
| 実装タイプ | Surface mount |
| Terminal Count | 14 terminals |
PCM1801U 14-pin soic ピン配置ガイド
PCM1801U (14-pin soic パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: PCM1801U.
詳細は データシート をご参照ください。
主な用途
PCM1801U の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: PCM1801U — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | PCM1725U |
|---|---|---|
| Package | 14-SOIC | 14-SOIC |
| Brand | Texas Instruments | Texas Instruments |
主な差別化要因
- 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)
設計ノート
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.
コンプライアンス情報
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.