High performance headphone amps
Designers are faced with a variety of considerations when developing portable devices, including compactness, style, and battery life.
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Key Feature 1 : Ultra-low 2mA current consumption (VDD=3.3V, no-signal stereo operation) and 0.006% distortion (VDD=3.3V, RL=16, Po=10mW)
Headphone amps usually experience a trade-off between circuit current and distortion. To solve this problem ROHM utilizes a unique circuit structure for simultaneously low distortion and circuit current: 0.006% and 2mA - roughly half the circuit current of conventional amps that don't require an output coupling capacitor.
Key Feature 2 : Heavy bass playback via direct connection
ROHM output coupling capacitor-less headphone amps integrate a stable negative power supply charge pump circuit. In addition, signal processing is performed at reference Ground, eliminating the need for a large capacitance output coupling capacitor while allowing direct connection to headphones. This enables attenuated, powerful low-frequency playback similar to conventional systems using an output coupling capacitor.
Key Feature 3 : Ultra-compact WL-CSP (2.1mm to 2.1mm)
ROHM headphone amps are offered in an ultra-compact 2.1mm to 2.1mm WL-CSP, reducing mounting area to only 1/5th the size of conventional circuits utilizing an 8-pin headphone amp and 2 large electrolytic capacitors. Height is reduced as well, making them ideal for sets with severe size restrictions.
|Part No.|| Power Supply |
| No-Signal |
| Voltage |
| Output |
| THD+N |
| Output |
| PSRR |
|BD88200GUL||2.4 to 5.5||2.0|| Set via |
| 80 |
| 0.006 |
|10|| -80 |
| VCSP50L2 |
(2.1mm to 2.1mm
| Virtual |
|BD88400GUL|| Set via |
| Ground |