HT97220L 耳机功率放大器，输入电压2.5-5.5V,差分输入，32欧 125mW双声道

The HT97220L/HT4917 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 1k惟 with a 5V supply and 2VRMS into 600惟 loads from a 3.3V supply. A headphone load is capable of being driven with 125mW into 32惟 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掳C to +85掳C temperature range.飦� TYPICAL