PCM1794DB - 24-Bit 192kHz Stereo DAC | Texas Instruments
MPN： PCM1794DB ✗ 停產PCM1794DB 概覽
A digital-to-analog converter, or DAC, converts digital audio samples into an analog voltage or current representation. The PCM1794DB belongs to the stereo audio DAC category within the broader ADC/DAC and interface-converter hierarchy. It is designed for high-resolution audio equipment, where digital source quality must be translated into a low-distortion analog output for headphone, line, or preamplifier stages.
Key features include 24-bit data resolution, 192 kHz maximum sampling capability, advanced segment DAC architecture, balanced current outputs, and support for common digital audio interfaces including I2S, PCM, and left-justified formats. The manufacturer describes the converter as a monolithic CMOS integrated circuit with improved tolerance to clock jitter. Its balanced outputs support flexible analog signal routing while preserving channel symmetry.
The PCM1794DB is normally used with external current-to-voltage conversion, filtering, and output-buffer circuitry. The balanced output architecture can reduce even-order distortion and common-mode effects when paired with a suitably matched analog stage. The converter also includes digital control functions for reset and operating-mode configuration, allowing it to be coordinated with an audio system clock and source device.
Typical applications include high-resolution stereo DAC modules, USB and network audio converters, CD-quality playback equipment, digital mixing consoles, headphone amplifiers, and balanced line-output stages. The 192 kHz sampling capability makes it appropriate for studio monitoring and archival audio systems, although system clocking and analog implementation remain important to achieving the intended performance.
When laying out a PCM1794DB circuit, keep digital clock and data traces away from the sensitive analog output network, use short and properly terminated clock routes, and place filtering and I/V components close to their associated pins. Verify power sequencing, reset timing, and the required 1024 system-clock initialization period before enabling normal audio operation.
This product page consolidates the manufacturer device information, distributor identification, package details, and practical implementation guidance for engineers evaluating the PCM1794DB in a new audio-converter design.
直接替換替代品，適用於 PCM1794DB — 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： PCM1794DB （相同外形與佔位） — 差異在於 Clock Jitter Tolerance, Digital Audio Interface, Package, Process Technology.
PCM1794DBR
✅ 直接替換📋 參考替代品（不在目錄中）
PCM1794ADBR
✅ 直接替換📋 參考替代品（不在目錄中）
PCM1794DB-BB
✅ 直接替換📋 參考替代品（不在目錄中）
PCM1796DB
✅ 直接替換聯絡詢價
查看資料表 →PCM1798DB
✅ 直接替換📋 參考替代品（不在目錄中）
PCM1794DB 最大額定值與電氣特性
| Converter Type | Stereo audio digital-to-analog converter |
| Data Resolution | 24 bit |
| Maximum Sampling Rate | 192 kHz |
| DAC Architecture | Advanced segment DAC |
| 輸出配置 | Balanced current outputs |
| Digital Audio Interface | I2S, PCM, and left-justified |
| Digital Input Tolerance | 5 V tolerant |
| Supply Condition for Electrical Characteristics | VCC1 = VCC2L = VCC2R = 5 V, VDD = 3.3 V |
| Reference Test Condition | TA = 25 degrees C |
| Reference System Clock | 256 fS |
| Reference Sampling Rate | 44.1 kHz |
| 封裝 | 28-lead SSOP |
| Process Technology | CMOS |
| Initialization Requirement | 1024 system clock periods after reset |
| Dynamic Range | 9 V rms mono; 4.5 V rms stereo; 2 V rms stereo |
| THD+N | 0.0004% typical |
| Clock Jitter Tolerance | Improved tolerance; exact value not stated |
PCM1794DB 28-lead ssop 腳位配置指南
PCM1794DB（28-lead ssop 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： PCM1794DB.
請參閱 資料表 以查看完整腳位配置。
典型應用
PCM1794DB 適用於 6 應用s: High-Resolution Stereo Network DAC, Balanced Line Output Stage, Studio Monitoring DAC, USB Audio Interface, Digital Audio Console Output, Digital Music Player and Hi-Fi Headphone DAC.
High-Resolution Stereo Network DAC
The PCM1794DB fits a high-resolution network-audio output stage because it supports 24-bit data at sampling rates up to 192 kHz and accepts I2S, PCM, or left-justified digital audio. A network receiver or music server can feed the converter through a digital audio interface, after which the balanced current outputs feed a matched I/V and reconstruction-filter network. Using the converter's balanced topology can improve channel symmetry and reject common-mode effects in the following analog stage. The practical trade-off is that the DAC does not directly drive a line or headphone load; designers must budget for external conversion, filtering, stable references, and a low-noise output buffer. Clock routing and analog layout should be planned together because switching or clock-jitter degradation cannot be corrected by the output filtering alone.
推薦
Balanced Line Output Stage
The PCM1794DB is well suited to a balanced stereo line-output design because its advanced segment DAC architecture produces balanced current outputs for both channels. The external analog network can perform current-to-voltage conversion and reconstruction filtering while preserving the converter's channel symmetry. A balanced downstream path can reduce susceptibility to ground noise and may improve rejection of even-order distortion when the analog implementation is matched correctly. The converter does not produce a finished line-level voltage by itself, so resistor ratios, capacitor values, reference quality, and buffer stability determine the final output level and bandwidth. Designers should compare single-ended and balanced configurations in the intended system rather than assuming that identical conversion stages automatically yield identical distortion performance.
推薦
Studio Monitoring DAC
PCM1794DB can serve as the conversion element in a studio monitoring DAC where 24-bit resolution and operation up to 192 kHz are useful for high-resolution playback and signal-chain monitoring. The balanced outputs provide a flexible route into professional audio electronics, while the external I/V and filter stages establish the actual output bandwidth and level. Clock-jitter performance and analog noise floor depend on implementation, so use short clock routes, stable supplies, and carefully selected reconstruction components. The 192 kHz capability is valuable for studio workflows, but it should be matched to the selected I/V, filter, clock, and output-buffer bandwidth; otherwise, very high-frequency content can be attenuated without improving audible performance.
推薦
USB Audio Interface
The PCM1794DB is applicable to a USB-to-analog audio interface when the USB controller can deliver I2S, PCM, or left-justified data at the required system rate. The converter's 192 kHz maximum sampling rate supports high-resolution playback, and the 5 V tolerant digital-input characteristic helps define the interface design. A practical implementation requires a stable master clock, coordinated reset, and careful handling of the converter's 1024-system-clock initialization period. Analog outputs remain current outputs, so an I/V stage and reconstruction filter are necessary before driving headphones or line-level circuitry. Power-supply partitioning is especially important in a USB interface because converter clock, digital activity, and sensitive analog circuitry should not share uncontrolled return paths.
推薦
Digital Audio Console Output
The PCM1794DB can be used in a digital mixing console or digital audio output card when the system requires a high-resolution stereo conversion endpoint. Its 24-bit interface and sampling rates up to 192 kHz accommodate modern multichannel source management, while the balanced outputs simplify routing into downstream analog mixers or monitors. The implementation should isolate converter clocks and digital data from the analog output network, and it must provide the required reset and initialization sequence before valid audio begins. Balanced current outputs still need external I/V conversion, filtering, and buffering, so component tolerances and reference stability contribute directly to channel matching and distortion. The design should also verify whether the console requires sample-rate conversion before the DAC or can clock the converter directly from its central audio engine.
推薦
Digital Music Player and Hi-Fi Headphone DAC
PCM1794DB can form the conversion core of a high-resolution digital music player or headphone DAC when low-distortion balanced analog outputs and flexible digital interfaces are priorities. Its 24-bit resolution supports high-resolution sources, and operation up to 192 kHz provides compatibility with high-rate playback chains. The external analog design must convert the balanced currents into voltage, apply reconstruction filtering, and drive the chosen headphone or line stage with adequate current and stability. Component selection is especially important around the converter because mismatched I/V networks can undermine channel balance and increase distortion. A compact implementation also requires careful thermal and return-path management, particularly when the headphone amplifier operates concurrently with digital and analog circuitry on the same board.
推薦
推薦產品摘要
工程參考資料，適用於 PCM1794DB — 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 | PCM1794DBR | PCM1794ADBR | PCM1794DB-BB | PCM1796DB | PCM1798DB |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Converter Type | Stereo audio DAC | Stereo audio DAC | Stereo audio DAC | Stereo audio DAC | Stereo audio DAC | Stereo audio DAC |
| Price Tier | Current quote required | Current quote required | Current quote required | Current quote required | Current quote required | Current quote required |
主要差異化特點
- Direct 192 kHz conversion capability (對比PCM1798DB)
- Balanced current-output architecture (對比PCM1796DB)
- 5 V tolerant digital interface (對比PCM1794DBR)
設計說明
Separate the PCM1794DB digital clock and data routes from the balanced analog output network. Use a continuous ground reference, avoid routing system clocks beneath the converter or I/V components, and place the closest decoupling capacitors at their associated supply pins. The 5 V analog supplies and 3.3 V digital supply shown in the electrical-characteristics conditions should each have a deliberate return-current path to minimize digital-to-analog coupling.
Treat the system clock as a high-quality signal rather than an ordinary control output. Keep it short, use a controlled source with clean edges, avoid unnecessary stubs, and observe the required reset sequence. After reset is set to logic 1, allow 1024 system clock periods for initialization before treating the converter output as valid. Clock jitter and power-supply noise can affect the analog result even when the digital data itself is correct.
Do not connect the PCM1794DB current outputs directly to a line or headphone input. The balanced current outputs require an external I/V conversion network, reconstruction filtering, and an appropriate buffer. Confirm component tolerances and channel symmetry between the two channels, and verify the complete output-stage bandwidth at 192 kHz rather than designing only for the nominal 44.1 kHz test condition.
Keep switching-regulator and digital-clock energy out of the analog output stage by placing the converter near the analog network while routing digital connections toward the source interface. Use local high-frequency bypass and controlled supply distribution for the 5 V and 3.3 V domains. If the board combines a USB interface, processor, and audio converter, inspect return-current paths under load because ground splits that look electrically acceptable at idle can become audible noise sources during digital activity.
合規資訊
The manufacturer product information confirms CMOS construction and a 28-lead SSOP package but does not state the requested compliance classifications. AEC-Q100 qualification is not established for the standard PCM1794DB part.
