Jiaxing Heroic Elec Tech HT97220

The HT97220 is a differential input Direct Drive line driver/headphone amplifier, which can also drive single-ended input signal. It is capable of driving line level loads with 3VRMS into 1kΩ with a 5V supply and 2VRMS into 600Ω loads from a 3.3V supply. A headphone load is capable of being driven with 125mW into 32Ω with a 5V supply. The IC is offered with an externally set gain through external resistors (or an internally fixed 6dB gain which needs to be pre-booked. The external gain setting nodes can also be used to configure filters for set-top box applications. The IC has exceptional THD+N over the full audio bandwidth. The HT97220 is a fully differential input line driver/ headphone amplifier for set-top boxes, LCD TV, and home theater applications where audio fidelity is of primary importance. Power consumption of the amplifier is reduced while maintaining high SNR and THD+N performance. The HT97220 require external input and feedback resistors to set amplifier gain. For internal fixed gain of +6dB, it is only available if pre-booked. Output swings of 3VRMS with a 5V supply and 2VRMS with a 3.3V supply are perfect for line driver applications. High fidelity is maintained through the differential input connection. An output noise voltage of 7uVRMS allows for 112dB SNR when powered from 5V and 109dB SNR when powered from 3.3V. The IC has better than 90dB THD+N across the entire audio bandwidth. The HT97220 operates from a single supply ranging from 2.5V to 5.5V. An on-chip charge pump inverts the positive supply (PVDD), creating an equal magnitude negative supply (PVSS). The headphone amplifiers operate from bipolar supplies with their outputs biased about PGND. The benefit of this PGND bias is that the amplifier outputs do not have a DC component, typically PVDD/2. The large DC-blocking capacitors required with conventional headphone amplifiers are unnecessary, thus conserving board space, reducing system cost, and improving frequency response. Output power of 125mW into 32Ω is achievable from a 5V supply. The device features an under-voltage lockout that prevents operation from an insufficient power supply and click-pop suppression that eliminates audible transients on startup and shutdown.

• Direct Drive Outputs Eliminate DC-Blocking Capacitors, Save Space
• Excellent Bass Fidelity
• Shutdown and Startup without any Click-Pop Noise
• Exceptional Low THD+NI: 0.001% Minimum
• Absolutely Low Noise and High SNR Performance, VN: 7μV, SNR: 112dB
• Differential or Single-Ended Input
• Wide 2.5V to 5.5V Operating Range
• Output Power: 125mW (fIN = 1kHz, VDD = 5V, RL = 32Ω, THD+N = 1%)
• Output Voltage Swing: 3Vrms (fIN = 1kHz, VDD = 5V, RL = 1kΩ, THD+N < 0.1%); 2Vrms (fIN = 1kHz, VDD = 5V, RL = 600Ω, THD+N < 0.1%)
• Pb Free Packages, QFN16L-PP 3mm×3mm, Extremely Simple BOM Needed

• Headphones
• Simple Multimedia Interfaces
• Set-Top Boxes
• Blue-ray and DVD Players
• LCD Televisions
• Prosumer Audio Devices