Analog Devices MAX98397
The MAX98397 is a high-efficiency, mono Class-DG speaker amplifier with industry-leading quiescent power, featuring integrated speaker current and voltage sensing (IVSENSE), a brownout-prevention engine (BPE), and dynamic-headroom tracking (DHT). The device also enables ultrasound applications by providing support for sample rates up to 192kHz, a higher passband (for fS > 50kHz), and a bypass path for the ultrasound signals through the amplifier so it is not attenuated by the audio processing.
| Part No. |
MAX98397 |
| Datasheet |
MAX98397
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| Manufacturer |
 Analog Devices |
| Description |
Class-DG Amplifier |
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GENERAL DESCRIPTION
Precision output current monitoring (ISENSE) and voltage monitoring (VSENSE) enable speaker protection algorithms to be run by a host device. Spread-spectrum modulation (SSM) and edge rate control minimize EMI and eliminate the need for the output filtering found in traditional Class-D devices. To achieve industry-leading quiescent power, the ClassDG architecture employs two supply rails; VBAT (3V to 5.5V) and PVDD (3V to 28V) to supply the speaker amplifier. The Class-DG amplifier switches between the two supply rails depending on the input signal level and/or the supply headroom. For battery-powered applications, the BPE is designed to help prevent the possibility of a system brownout by reducing the device's contribution to the overall system power consumption. This is achieved by either attenuating or limiting the amplifier output when the device supply drops below a set of programmable BPE thresholds. Additionally, as the power-supply voltage varies due to sudd...
