HT6879 is a low-EMI, Anti-Clipping, filter-less, monaural Class D audio power amplifier IC with maximum output power of 3.5W, integrated 32-step digital volume control function. It has a high efficiency in a variety of audio terminal applications with Class AB amplifier performance.
HT6879 has excellent EMI radiation suppression characteristics. The radiation level is well below FCC Part15 Class B standards without any additive design. It keeps from interference with other EMI sensitive circuits, simplifies system design and lowers system cost.
HT6879 features Anti-Clipping Function (ACF) which detects and suppresses output signal clippings due to the over level inputs of music or voice signals. The ACF function also can adapt the output clippings caused by power supply voltage down in battery applications. It improves acoustical qualityconsiderably,givesgreatlistening enjoyment, and prevents speaker from overload damaging. According to different audio sources, two modes, ACF-1 and ACF-2, could be selected to achieve a best audio performance.
HT6879 has a filter-less modulation circuit which directlydrivesspeakerswhilerealizeslow distortion and low noise characteristics. Thanks to filter-less, circuit design with fewer external parts can be made in portable applications.
HT6879hasshutdownmode,over-current protection, over-temperature protection and low supply voltage malfunction preventing function.
FEATURES
| APPLICATIONS
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TERMINAL FUNCTION*1
MSOP/DFN Terminal No. | Name | I/O | ESD composition | Function |
1 | BYPASS | A | PN | Analog reference terminal |
2 | UP | A | PN | Volume up |
3 | DN | A | PN | Volume down |
4 | IN- | A | PN | Negative input terminal (differential -) |
5 | IN+ | A | PN | Positive input terminal (differential +) |
6 | OUT+ | O | - | Positive output terminal (differential +) |
7 | VDD | Power | - | Power supply |
8 | GND | GND | - | GND |
9 | OUT- | O | - | Negative output terminal (differential -) |
10 | CTRL | I | PN | Shutdown and ACF control terminal |
*1: Input terminal O: Output terminal A: Analog terminal
when a voltage that is higher than the VDD potential is impressed into the terminal of PN (ESD protection circuit is
composed of PMOS and NMOS), the leakage current flows through the protection circuit of PMOS.