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AK7754

Audio DSP with Stereo CODEC + MIC/HP-AMP

Asahi Kasei Microdevices 

[AK7754]

ANALOG CHARACTERISTICS (HP-Amp)

(Ta=25ºC; AVDD=HVDD=DVDD=3.3V; DVDD18=1.8V; VSS1=VSS2=VSS3=VSS4=0V; Signal frequency 1kHz;

Measurement frequency=20Hz~20kHz@48kHz; PMSRC bit=“0”), RL =16Ω; Circuit External Capacitance:

C1=C2=OPEN. CKM mode6, Unless otherwise specified.)

Parameter

min

typ

max

Unit

Analog Volume Characteristics

Gain

Max (HPGL,HPGR[4:0] bits= “1FH”)

-

+0

-

dB

Min (HPGL,HPGR[4:0] bits= “01H”)

-

-50

-

dB

Step width

+0dB ∼ -16dB

0.1

1

-

dB

-16dB ∼ -38dB

0.1

2

-

dB

-38dB ∼ -50dB

-

4

-

dB

Headphone-Amp Characteristics: DAC → HPL/HPR pins, RL=16Ω (Note 16)

Output Voltage

1.68

1.87

2.06

Vpp

S/(N+D)

(-3dBFS)

60

70

-

dB

S/N

(A-weighted)

83

89

-

dB

Inter channel Isolation

60

75

-

dB

Inter channel Gain Mismatch

-

0.0

1.0

dB

Load Resistance

(RL, Figure 2)

16

-

-

Ω

Load Capacitance

(C1, Figure 2)

-

-

30

pF

Load Capacitance

(C2, Figure 2)

-

-

300

pF

Note 16. Because of an asynchronous circuit operation, the characteristic may deteriorate when SRC is in operation.

HP-Amp

–

HPL pin

HPR pin

Measurement

Point

47μF

+

+

C1

0.22μF C2

RL

10Ω

Figure 2. Headphone Amp Output Circuit

MS1138-E-01-PB

12

2012/03

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