Technical details of CRI D-Amp Driver
This page introduces the technical details of the “CRI D-Amp Driver”.
Features
1.Fully digital processing & Output
- Fully Digital Processing & Output
CRI D-Amp Driver’s proprietary drive method enables a full digital audio path, from sound processing to PWM output and direct speaker drive.
2.Low power consumption & High Efficiency
- Low power consumption
Compared to standard amplifiers of the same class at equivalent sound pressure levels.
- High-Efficiency
Compared to mainstream Class-D amplifiers, D-Amp has fewer switching cycles, resulting in lower ON and OFF losses per unit time. This results in higher power efficiency and a greater output sound pressure level from the speakers.
3.Low Noise & High-Quality Sound
- Low Noise
Residual noise is the lowest measurement limit, outperforming mid-range headphone amplifiers, and is nearly equivalent to the low noise levels of mastering-grade professional amplifiers.
- Harmonic Noise Reduction
Our D-Amp technology incorporates NOS (Non-Over Sampling) technology, which significantly reduces harmonic noise by -20dB compared to standard Class D amplifiers. This means that even the most subtle sounds are clear and distinct without being masked by unwanted noise.
- Differential Noise Control
Introduced a differential drive output design that utilizes a self-canceling effect, providing strong resistance to external noise and ensuring clear audio.
- Faithful Sound Reproduction
Compared to conventional Class-D amplifiers, our system delivers cleaner waveforms, especially in low-frequency ranges, ensuring more faithful sound reproduction.
4.Single-chip drives multi-channel output
A single chip of the microcontroller or FPGA can achieve a multi-channel output.
5.Piezo versions are also available
Using piezoelectric buzzers instead of speaker units is suitable for cost and energy saving.
| [Speaker] D-Amp Driver SP | [Piezo] D-Amp Driver PIEZO | |
|---|---|---|
| Key Features | Loud Volume & High Quality | Energy Saving |
| External Circuit | H-Bridge Circuit for Speakers | H-Bridge Circuit for Piezoelectric Buzzers (+Boost Circuit) |
| Main Application Fields | AV system Automotive Devices Industrial Equipment Consumer Electronics Functional Speakers Home Appliances and Housing Equipment | Alarm Devices Housing Equipment Healthcare Devices PC/OA Peripheral Equipment |
Value for Customers
1.Flexible Design
Our software offers incredible flexibility. We can easily integrate it with almost any microcontroller (MCU) or field-programmable gate array (FPGA), providing you with more design options for your product.
2.Reduce Procurement Risk
We utilize standard parts in our system rather than hard-to-find specialized components. This means you can easily find replacements if needed, which significantly reduces the risk of supply problems and simplifies stock management.
3.Simple Integration
Our comprehensive SDK, custom-built for your specific microcontroller, provides the guidance and support you need to add a CRI D-Amp Driver to your project with ease and speed.
4.Lasting Software Asset
With D-Amp Driver, your audio implementation becomes a lasting asset. You can easily carry it over to new microcontrollers and systems, ensuring your initial development efforts continue to pay off. This lasting value provides a sense of security and confidence in your investment.
Proprietary Audio Compression
- Our proprietary audio compression methods are also available
We offer two types of codec methods. You can choose the one that best suits your application.
ADX: Approximately 1/4 compression ratio with low decoding load.
HCA: Achieves a compression ratio of around 1/6 to 1/12, though with increased decoding load.
| Codec | Compression Ratio | Data size | Load Percentage |
|---|---|---|---|
| Original Sound | — | 2846KB | — |
| ADX | Approx. 1/4 | 797KB(13kB/s) | Approx. 4% |
| HCA | Approx. 1/6 to 1/12 | 342KB(5.7KB/s) | Approx. 12% |
- Audio compression tool
You can use our proprietary compression tool under the terms of the CRI D-Amp Driver contract.
MCU Requirements & Support
- Microcontroller Features Required for “CRI D-Amp Driver“
The “CRI D-Amp Driver” outputs audio by controlling port ON/OFF states. Therefore, it requires two general-purpose I/O ports and two PWM timers. Specifically, your microcontroller needs.
- Timer Clock Freqency settable to 16MHz or higher: Frequencies lower than this might be compatible under certain conditions.
- Two synchronized PWM outputs: In some cases, alternatives to PWM timers might be usable.
*Please contact us for details.
- Supported Microcontrollers
The following microcontrollers are either supported or confirmed to be supported. Other microcontrollers, including the Cortex-M series, are also supported.
| Manufacturer | Supported Microcontrollers |
|---|---|
| Renesas | RL78, RA, RE, RX, RZ, RH850, R-Car 78K0, R8C, SH |
| Infineon | F² MC-16FX, FR81S, FM0+, FM3, FM4, PSoC, PRoC, Traveo |
| TOSHIBA | TZ2100, TXZ3, TXZ4 |
| STMicro | STM32 |
| NXP | Kinetis, LPC, i.MX |
| Microchip | PIC24F, SAM |
| NORDIC | nRF52 |
| GigaDevice | GD32 |
| MindMotion | MM32 |
| Telechips | TCC803x |
| LAPIS | U16 |
| NUVOTON | MN103,N9H30 |