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HT97180
125mW Direct Drive Line Drivers/Headphone Amplifiers
The HT97180 is a differential input Direct Drive line driver/headphone amplifier, which can also drive single-ended input signal. It is capable of being driven with 125mW into 32Ω with a 4.2V 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 4.2ms 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.
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FEATURES

  • Direct Drive Outputs Eliminate DC-Blocking Capacitors, Save Space

  • Excellent Bass Fidelity

  • Shutdown and Startup without any Click-Pop Noise

  • Exceptional Low THD+N: 0.002% Minimum

  • Absolutely Low Noise Performance, VN:8μV

  • Differential or Single-Ended Input

  • Wide 1.65V to 4.8V Operating Range

  • Output Power: 125mW (fIN = 1kHz, VDD=4.2V, RL=32Ω, THD+N=0.1%);

  • Pb Free Packages, QFN16L-PP 3mm*3mm, Extremely Simple BOM Needed


APPLICATIONS

  • Headphones

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


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TERMINAL FUNCTION

PINNAMEDescription
1PVDDCharge-Pump Power-Supply Input. Bypass to PGND with 1μF.
2C1PPositive Flying Capacitor Connection. Connect a 1μF capacitor between C1P and C1N.
3PGNDPower Ground. Connect PGND and SGND together at the system ground plane.
4C1NNegative Flying Capacitor Connection. Connect a 1μF capacitor between C1P and C1N.
5PVSSNegative Charge-Pump Output. Bypass to PGND with 1μF.
6SGNDSignal Ground. Connect PGND and SGND together at the system ground plane.
7INR+Right Positive Polarity Input
8INR-Right Negative Polarity Input
9SVDD2Signal Path Power-Supply Input. Connect directly to PVDD.
10OUTRRight Direct Drive Output
11BIASInternal Supply Node. Bypass to PGND with 0.1μF.
12OUTLLeft Direct Drive Output
13SVDDSignal Path Power-Supply Input. Bypass to PGND with 1μF. Connect directly to PVDD.
14INL-Left Negative Polarity Input
15INL+Left Positive Polarity Input
16nSHDNActive-Low Shutdown. Drive nSHDN high for normal operation.
—EPExposed Pad. Electrically connect to PGND or leave unconnected.


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