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.
Two versions of the IC can be chosen with different turn-on times (tON). The versions for headphone applications feature a tON of 5.5ms while the version, intended for set-top-box applications, which needs to be pre-booked, feature a 130ms tON. An on-chip charge pump inverts the power-supply input, creating a negative rail. The output stage of the amplifier is powered between the positive input supply and the output of the charge pump. The bipolar supplies bias the output about ground, eliminating the need for large, distortion-introducing output coupling capacitors. The IC shutdowns and startups without click-pop noise.
The IC is available in a 3mm x 3mm, 16-pin QFN-PP and is specified over the extended -40°C to +85°C temperature range.
・Direct Drive Outputs Eliminate DC-Blocking Capacitors, Save Space
・Excellent Bass Fidelity
・Shutdown and Startup without any Click-Pop Noise
・Exceptional Low THD+N: 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