STA32813TR - 2.1-Channel DDX Digital Audio System | STMicroelectronics
部品番号: STA32813TR ✗ 生産終了STA32813TR 概要
A digital audio system (DDX) is a class-D audio amplifier in which the entire signal chain - PCM/analogue input conversion, digital volume control, filtering and the power stage - is handled digitally or with digital control of an analogue power stage. In the component hierarchy it sits above a power amplifier IC, inside the broader group of amplifier ICs and audio amplifiers, and it removes the discrete class-AB output transistors, bias resistors and output filter networks normally required for a multi-channel amplifier.
Key features of the STA32813TR include a 100 dB signal-to-noise ratio and dynamic range, support for input sample rates from 32 kHz to 192 kHz, 24-bit DDX processing with four 28-bit filter stages, and digital gain or attenuation resolution of 0.5 dB per step. The power section is built from four independent half-bridges that can be reconfigured by digital control into 2.1-channel, stereo, bridge or single-channel power topologies.
Because the output stage is switch-mode, the amplifier dissipates far less output-stage power than a class-AB design of comparable output, which reduces the size of the heatsink and the number of parallel supply rails needed in compact consumer systems. The device accepts both digital (I2S-like) and analogue audio paths depending on configuration, and the integrated volume control removes the need for a separate audio attenuator.
Typical applications are flat-panel television and monitor audio, active speakers and soundbars, compact home theatre and multimedia speaker systems, and consumer audio receivers that need stereo plus subwoofer output from a single power device.
When designing around the STA32813TR, respect the maximum 36 V supply voltage, keep the power-supply decoupling capacitors physically close to the supply pins, and confirm that the PCB copper area under the exposed pad is large enough for the dissipation at the chosen output power. The 36-pin PowerSO-36 footprint must be matched exactly; the parts are not pin-compatible with QFP-class amplifiers.
ドロップイン代替品: STA32813TR — 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。
STA328
✅ ドロップイン📋 参考代替品（カタログ未掲載）
STA323W
✅ ドロップイン📋 参考代替品（カタログ未掲載）
STA32813
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
STA329
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
STA3212
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
STA32813TR 最大定格＆電気的特性
| Product Type | 2.1-channel high-efficiency digital audio system (DDX) |
| Manufacturer | STMicroelectronics |
| Series | DDX |
| Number of Channels | 2.1 channels (configurable up to 2 x 80 W stereo) |
| 動作電源電圧 | 10 V to 36 V |
| Digital Supply Voltage | up to 3.6 V |
| Output Power (2.1-Channel Configuration) | 2 x 40 W + 1 x 80 W |
| Output Power (Stereo Configuration) | 2 x 80 W |
| Power Stage Topology | 4 independent half-bridges, digitally reconfigurable |
| Signal-to-Noise Ratio | 100 dB |
| Input Sample Rate Range | 32 kHz to 192 kHz |
| Internal Processing Resolution | 24-bit DDX |
| Filter Resolution | 28-bit, four filters |
| Digital Gain/Attenuation Step | 0.5 dB |
| 動作温度範囲 | -40 C to +125 C (junction) |
| パッケージ | PowerSO-36 (36-BSSOP with exposed pad) |
| Number of Terminals | 36 |
| Terminal Form | Gull wing |
| 実装タイプ | Surface Mount |
| Package Body Width | 11.00 mm (0.433 inch) |
| ECCN | EAR99 |
| カテゴリ | Audio Special Purpose / Amplifier ICs |
STA32813TR 11.00 mm (0.433 inch) ピン配置ガイド
STA32813TR (11.00 mm (0.433 inch) 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: STA32813TR.
詳細は データシート をご参照ください。
主な用途
STA32813TR の用途: 6 件s: Flat-Panel Television Audio, Active Speakers and Soundbars, Home Theatre and Multimedia Speaker Systems, Automotive and Industrial Audio Modules, Wireless Speaker and Bluetooth Amplification, Digital Audio Amplifier Reference and Evaluation.
Flat-Panel Television Audio
The STA32813TR suits flat-panel television and monitor audio because a 2.1-channel system can drive the left and right speakers at up to 2 x 40 W while a dedicated half-bridge delivers up to 80 W into a down-firing subwoofer, all from one 36-pin PowerSO-36 package. The 100 dB SNR means the amplifier contributes no audible hiss between quiet dialogue passages, and the 0.5 dB digital gain steps let the TV's system software balance the subwoofer against the stereo channels without an external attenuator. Because the output stage is switch-mode, the dissipation and therefore the heat-sink area are far smaller than for an equivalent class-AB design, which is critical when the amplifier sits directly behind a thin panel. The 24-bit processing and 192 kHz sample-rate capability also allow the same device to serve as an amplifier for high-resolution source material in premium TV sets. Designers should still budget for a power-supply bulk capacitor sized for the peak 2.1-channel current draw and route the exposed pad to a substantial copper pour.
おすすめ
Active Speakers and Soundbars
Active bookshelf speakers and soundbars benefit from the STA32813TR because the device integrates digital processing, digital volume control and the power stage in one package, removing the need for a separate pre-amplifier, codec volume attenuator and discrete output transistors. In a compact soundbar, the 2.1-channel topology delivers 2 x 40 W for the left and right drivers plus up to 80 W for the wireless subwoofer, with a single device and a single set of supply rails. Digital gain control in 0.5 dB steps gives repeatable channel balancing between units, and the 100 dB SNR keeps the noise floor below the audible threshold in near-field listening. The switch-mode output stage dissipates far less output-stage power than a class-AB design of the same output, reducing the size of the aluminium heat spreader required inside a thin enclosure. Because the part is surface mount in a PowerSO-36 with an exposed pad, the PCB must provide both the thermal path and the low-inductance supply return that class-D switching current demands.
おすすめ
Home Theatre and Multimedia Speaker Systems
The STA32813TR is a natural fit for home theatre receivers, active subwoofers and PC multimedia speaker systems that need several amplified channels from limited board area. Supporting input sample rates from 32 kHz to 192 kHz means the amplifier accepts the output of a modern AV receiver or PC sound card without an external sample-rate converter, while the internal 24-bit processing chain with four 28-bit filters performs the channel filtering and volume management digitally. Power configurations are flexible because the four independent half-bridges can be reconfigured by digital control into 2.1-channel, stereo, bridged or single-channel arrangements, so one silicon platform can cover several product variants in a product family. Peak outputs of 2 x 40 W plus 1 x 80 W allow a subwoofer to be driven from the same amplifier that powers the satellites. The main engineering constraint is supply current: the switching stage draws high peak current from the power rail, so the supply must be sized for transient loads and decoupled very close to the package pins.
おすすめ
Automotive and Industrial Audio Modules
Automotive and industrial audio modules can adopt the STA32813TR where a compact, high-efficiency multi-channel amplifier with digital control is required, because the switch-mode output stage delivers high efficiency and the digital interface allows the host microcontroller to set volume and channel balance over a serial bus instead of through analog potentiometers. The -40 C to +125 C junction operating range specified by STMicroelectronics covers industrial ambient conditions, and the wide 10 V to 36 V supply window suits 12 V and 24 V automotive rails with transient headroom. For industrial systems the same device can be used for control-room monitoring, kiosk audio and intercom-style amplification where multiple channels must be volume-matched. Two design cautions apply: the exposed pad of the PowerSO-36 package is the primary thermal path and must be tied to a generous copper pour, and any automotive design must confirm AEC-Q100 qualification status with STMicroelectronics for the specific order code, since the qualification marking is not stated in the available documentation.
おすすめ
Wireless Speaker and Bluetooth Amplification
Wireless speakers, Bluetooth speakers and portable-networked speakers use the STA32813TR to convert a digital audio stream directly into speaker drive without a separate analogue power stage. Because the device performs digital gain control in 0.5 dB steps and accepts sample rates up to 192 kHz, a Bluetooth or Wi-Fi audio front end can feed the digital input directly, removing an analogue pre-amplifier and reducing board area in space-constrained enclosures. The switch-mode output stage is particularly valuable in portable products because its efficiency reduces battery current for a given acoustic output, and the 2.1-channel configuration allows a compact two-speaker plus passive-radiator design. Thermal design must account for the enclosure being sealed and often convection-limited, so the exposed pad should be tied to the largest available internal copper surface and, where permissible, a small heat spreader. The device must also be operated within its 36 V maximum power supply rating, which in battery-fed systems is normally never reached.
おすすめ
Digital Audio Amplifier Reference and Evaluation
The STA32813TR is also used as the centerpiece of digital audio amplifier reference designs and evaluation platforms, where engineers need to explore DDX power-stage configuration, digital volume and filter behaviour before committing to a production board. The configurable four-half-bridge architecture allows a single evaluation board to be reconfigured in firmware between 2.1-channel, stereo, bridged and single-channel modes, which makes it far more instructive than a fixed-output discrete amplifier design. Because the power section is switch-mode, the reference board also serves as a test fixture for EMI and EMC debugging, since class-D output current harmonics and supply ripple are the dominant challenges in such designs. The 24-bit processing and four 28-bit filters allow digital filter tuning experiments to be evaluated without changing external passive components. Design guidance from the STMicroelectronics datasheet, including the recommended PCB layout and exposed-pad treatment, should be followed closely, since evaluation-board performance depends strongly on layout quality.
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: STA32813TR — 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 | STA328 | STA323W | STA32813 | STA329 | STA3212 |
|---|---|---|---|---|---|---|
| Package | PowerSO-36 (36-BSSOP with exposed pad) | PowerSO-36 - same family | PowerSO-36 - same family | PowerSO-36 - same | PowerSO-36 - same family | PowerSO-36 - same family |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Product Type | 2.1-channel high-efficiency digital audio system (DDX) | DDX digital audio system | DDX digital audio system, earlier generation | 2.1-channel DDX digital audio system | DDX digital audio system | Stereo DDX digital audio system |
主な差別化要因
- Subwoofer half-bridge included in the same package （vs STA3212)
- Integrated digital gain control removes external attenuation （vs STA323W)
- Wide supply range supports 24 V industrial and automotive rails （vs STA328)
- Fully integrated single-chip amplification （vs Discrete class-AB output stage)
設計ノート
The PowerSO-36 exposed pad is the only meaningful thermal path and must be soldered to the PCB. Estimated: at 2 x 40 W plus 1 x 80 W of output into 4 ohm with an 85 percent efficiency assumption, the DC input power is roughly 235 W, of which about 35 W is dissipated in the half-bridge stage; spread over the exposed pad and surrounding copper this requires a large copper pour, and the junction must stay below the 125 C limit. Increase the pour area or add a heat spreader if the enclosure airflow is limited.
Class-D output current is high and fast-rising, so layout dominates performance. Place the bulk electrolytic and high-frequency ceramic decoupling capacitors on the power pins as close to the package as possible, keep the loop between the supply pins and the capacitor extremely short, and use a solid ground plane under the exposed pad. Never route the switching outputs (half-bridge outputs) beneath the input or control nets, and keep the digital input traces away from the power stage to prevent switching-edge coupling into the audio path.
The DDX output stage is a switch-mode amplifier, so conducted and radiated emissions are the primary EMC risks. Use the recommended output filter network from the STMicroelectronics datasheet at each half-bridge output, keep the filter loop area minimal, and provide a common-mode choke or ferrite in the supply leads if needed. Because the power supply must source high peak current at high frequency, an over-current-protected but low-impedance supply stage is preferable to a slow switcher.
Common mistakes include exceeding the 36 V maximum supply voltage, forgetting to connect the exposed pad electrically and thermally, and assuming the digital gain control can be changed while the device is muted without re-checking the filter coefficients. Another trap is treating the STA32813TR as a generic 36-pin SSOP: the PowerSO-36 land pattern is not interchangeable with a JEDEC SSOP-36 footprint. Also verify the subwoofer half-bridge assignment in firmware, because a mis-configured 2.1-channel map can drive a full-range driver at 80 W.
コンプライアンス情報
The available verified sources for STA32813TR do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free or conflict-minerals status; all are therefore recorded as unknown rather than assumed. GlobalSpec lists the part as EAR99 with an introduction date of May 26, 2004 and describes the series as DDX.
