AK4645 datasheet(9/96 Pages) AKM

Part #	AK4645

Description	Stereo CODEC with MIC/HP-AMP

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Manufacturer	AKM [Asahi Kasei Microsystems]

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9 / 96 page

ASAHI KASEI

[AK4645]

MS0543-J-00

2006/09

- 9 -

Parameter

min

typ

max

Units

Headphone-Amp Characteristics: DAC

→ HPL/HPR pins, ALC=OFF, IVOL=0dB, DVOL=0dB; VBAT bit = “0”;

unless otherwise specified.

Output Voltage (Note 15)

HPG bit = “0”, 0dBFS, HVDD=3.3V, RL=22.8Ω

1.58

1.98

2.38

Vpp

HPG bit = “1”, 0dBFS, HVDD=5V, RL=100Ω

2.40

3.00

3.60

Vpp

HPG bit = “1”, 0dBFS, HVDD=3.3V, RL=16Ω (Po=62mW)

-

1.0

-

Vrms

HPG bit = “1”, 0dBFS, HVDD=5V, RL=16Ω (Po=70mW)

-

1.06

-

Vrms

S/(N+D)

HPG bit = “0”,

−3dBFS, HVDD=3.3V, R

L=22.8Ω

60

70

-

dBFS

HPG bit = “1”,

−3dBFS, HVDD=5V, R

L=100Ω

-

80

-

dBFS

HPG bit = “1”, 0dBFS, HVDD=3.3V, RL=16Ω (Po=62mW)

-

20

-

dBFS

HPG bit = “1”, 0dBFS, HVDD=5V, RL=16Ω (Po=70mW)

-

70

-

dBFS

(Note 16)

80

90

-

dB

S/N (A-weighted)

(Note 17)

-

90

-

dB

(Note 16)

65

75

-

dB

Interchannel Isolation

(Note 17)

-

80

-

dB

(Note 16)

-

0.1

0.8

dB

Interchannel Gain Mismatch

(Note 17)

-

0.1

0.8

dB

Load Resistance

16

-

Ω

Figure 2のC1

-

30

pF

Load Capacitance

Figure 2のC2

-

300

pF

Note 15. 出力電圧はAVDDに比例します。

Vout = 0.6 x AVDD(typ)@HPG bit = “0”, 0.91 x AVDD(typ)@HPG bit = “1”.

Note 16. HPG bit = “0”, HVDD=3.3V, RL=22.8Ω.

Note 17. HPG bit = “1”, HVDD=5V, RL=100Ω.

HPL/HPR pin

HP-Amp

47

µF

C1

16

Ω

C2

6.8

Ω

0.22

µF

10

Ω

Measurement Point

Figure 2. ヘッドフォンアンプ出力回路

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