BD88420GUL-E2 datasheet(8/26 Pages) ROHM

Part #	BD88420GUL-E2

Description	Coupling Capacitorless Headphone Amplifiers

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Manufacturer	ROHM [Rohm]

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Technical Note

8/25

BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL

www.rohm.com

2011.03 – Rev. A

●

Electrical characteristic curves – BD88410GUL (Reference data)

Fig.41 Output Voltage vs.

Input Voltage (VDD=3.3V)

-120

-100

-80

-60

-40

-20

0

-120 -100

-80

-60

-40

-20

0

Input Voltage [dBV]

VDD=3.3V

f=1kHz

BPF

RL=32Ω

RL=16Ω

Fig.42 Gain vs. Frequency

(VDD=3.3V)

-10

-8

-6

-4

-2

0

2

4

6

8

10

100

1k

10k

100k

Frequency [Hz]

VDD=3.3V

Po=10mW

Input coupling

capacitor = 1.0uF

RL=32Ω

RL=16Ω

Fig.47 Noise Spectrum

(VDD=3.3V)

-140

-120

-100

-80

-60

-40

-20

0

10

100

1k

10k

100k

Frequency [Hz]

VDD=3.3V

Input connect

to the ground

with 1uF

Fig.43 THD+N vs. Output

Power (VDD=3.3V, RL=16Ω)

0.001

0.01

0.1

1

10

100

1n

100n

10u

1m

100m

Output Power [W]

VDD=3.3V

20kHz-LPF

f=1kHz

Stereo

RL=16Ω

Out of phase

In phase

Fig. 44 THD+N vs. Output

Power (VDD=3.3V, RL=32Ω)

0.001

0.01

0.1

1

10

100

1n

100n

10u

1m

100m

Output Power [W]

VDD=3.3V

20kHz-LPF

f=1kHz

Stereo

RL=32Ω

Out of phase

In phase

Fig.45 THD+N vs. Frequency

(VDD=3.3V, RL=16Ω)

0.001

0.01

0.1

1

10

100

10

100

1k

10k

100k

Frequency [Hz]

VDD=3.3V

RL=16Ω

20kHz-LPF

Stereo (in phase)

Po=10mW

Po=1mW

Po=0.1mW

Fig. 46 THD+N vs. Frequency

(VDD=3.3V, RL=32Ω)

0.001

0.01

0.1

1

10

100

10

100

1k

10k

100k

Frequency [Hz]

VDD=3.3V

RL=32Ω

20kHz-LPF

Stereo (in phase)

Po=10mW

Po=1mW

Po=0.1mW

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