1. Features
Wide Power Supply Range: 2.5V to 5.5V
Gain Settings: -6dB, 0dB, 3dB, and 6dB
High Power Supply Noise Rejection
- 100 dB PSRR at 217 Hz
- 90 dB PSRR at 10kHz
Eliminates Need for DC-Blocking Capacitors
- Outputs Biased at 0V
- Improves System Noise Performance
Fully Differential or Single-Ended Inputs
- Built-In Resistors Reduces Component Count
- Improves System Noise Performance
Short-Circuit and Thermal-Overload Protection
2.3 mA Typical Supply Current
Constant Maximum Output Power from 2.5V to 5.5V
Active Click and Pop Suppression
+8 kV HBM ESD Protected Outputs
Small Package Available
- 16-Pin, 3 mm × 3mm Thin QFN
2. Applications
Notebook PCs
Cellular Phones
PDAs
Smart Phones
Portable Audio Equipment
MP3 Players
3. General Description
The ACM3220 is a stereo headphone amplifier that
eliminates the need for external dc-blocking output
capacitors. Differential stereo inputs and built-in resistors.
Differential stereo inputs and built-in resistors set the device
gain, further reducing external component count. Gain is
selectable at -6dB, 0dB, 3dB or 6dB. The amplifier drives
36mW into 32Ω speakers from a single 3.6V supply. The
ACM3220 provides a constant maximum output power
independent of the supply voltage, thus facilitating the
design for prevention of acoustic shock.
The ACM3220 features fully differential inputs to reduce
system noise pickup between the audio source and the
headphone amplifier. The high power supply noise rejection
performance and differential architecture provides
increased RF noise immunity. For single-ended input signals,
connect INL+ and INR+ to ground.
The device has built-in pop suppression circuitry to
completely eliminate disturbing pop noise during turn-on
and turn-off. The amplifier outputs have short-circuit and
thermal-overload protection along with +8 kV HBM ESD
protection, simplifying end equipment compliance to the IEC
61000-4-2 ESD standard.
The ACM3220 operates from a single 2.5V to 5.5V supply
with 2.3mA of typical supply current. Shutdown mode
reduces supply current to less than 1μA. |
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