AK4205EN Datasheet, PDF (15/25 Pages) Asahi Kasei Microsystems – Ultra Low Noise and Distortion Headphone Amp with Analog Switch

[AK4205]
9.4 Headphone Amplifier
Positive power of the internal headphone amplifier is supplied from the PVDDA/B pins and the negative
power is supplied from the PVEEA/B pins. In these condition, AK4492 achieves -118dB THD+N.
The headphone outputs (AMPOUTA/B pins) are single-ended outputs centered around VSS (0 V) and
DC cut capacitors are not necessary. A load resistance is 49 Ω (min.) including damping resistor (Rd).
The headphone amplifier inputs should be fully differential inputs cantered at 2.5 Vpp DC bias voltage
(PINA-NINA pins, PINB-NINB pins). The SWOUTA/B pin can output a 2Vrms when the input voltage
PINB-NINA pins (PINB-NINB pins) = 2 Vrms, damping resistance (Rd) = 33 Ω and headphone load
resistance (RL) = 600 Ω.
DC2.5V
DC2.5V
NINA pin
(NINB pin)
PINA pin
(PINB pin)
SWINA pin
Rd ^{(SWINB pin) SEL pin = “H” SWOUTA pin}
(SWOUTB pin)
AMPOUTA pin
(AMPOUTB pin)
RL
AVSSA pin
(AVSSB pin)
Figure 12. Headphone Amplifier
016012367-E-00
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2016/12