ASAHI KASEI

[AK4569]

MS0292-E-01

2005/07

- 8 -

FILTER CHARACTERISTICS

(Ta=25

°C; AVDD, DVDD, HVDD=2.5 ∼ 3.6V; fs=44.1kHz; DEM=OFF; BOOST=OFF)

Parameter

Symbol

min

typ

max

Units

ADC Digital Filter (LPF):

Passband

(Note 15)

±0.1dB

−1.0dB

−3.0dB

PB

0

-

-

20.0

21.1

17.4

-

-

kHz

kHz

kHz

Stopband

(Note 15)

SB

25.7

kHz

Passband Ripple

PR

±0.1

dB

Stopband Attenuation

SA

65

dB

Group Delay

(Note 16)

GD

-

17.0

-

1/fs

Group Delay Distortion

∆GD

0

µs

ADC Digital Filter (HPF):

Frequency Response

(Note 15)

−3dB

−0.5dB

−0.1dB

FR

3.4

10

22

Hz

Hz

Hz

DAC Digital Filter: (Note 14)

Passband

(Note 15)

±0.1dB

−0.7dB

−6.0dB

PB

0

-

-

20.0

22.05

19.6

-

-

kHz

kHz

kHz

Stopband

(Note 15)

SB

25.2

kHz

Passband Ripple

PR

±0.01

dB

Stopband Attenuation

SA

59

dB

Group Delay

(Note 16)

GD

-

16.8

-

1/fs

Group Delay Distortion

∆GD

0

µs

DAC Digital Filter + Analog Filter: (Note 14)(Note 17)

Frequency Response

0

∼ 20.0kHz

FR

-

±1.0

-

dB

BOOST Filter:

(Note 17) (Note 18)

MIN

20Hz

100Hz

1kHz

FR

-

-

-

5.74

2.92

0

-

-

-

dB

dB

dB

MID

20Hz

100Hz

1kHz

FR

-

-

-

5.94

4.71

0.14

-

-

-

dB

dB

dB

Frequency Response

MAX

20Hz

100Hz

1kHz

FR

-

-

-

16.04

10.55

0.3

-

-

-

dB

dB

dB

Note 14. BOOST OFF (BST1-0 = “00”)

Note 15. The passband and stopband frequencies scale with fs.

For example (DAC), PB=0.44*fs(@

±0.1dB), SB=0.57*fs(@−59dB).

Note 16. This is the calculated delay time caused by digital filtering. This time is measured from the input of analog signal

to setting the 20 bit data of both channels on input register to the output register of ADC. This time also includes

group delay of HPF. For DAC, this time is from setting the 20 bit data of both channels on input register to the

output of analog signal.

Note 17. DACL

HPL, DACR

HPR, DACL/R

MOUT.

Note 18. These frequency responses scale with fs. If high-level signal is input, the AK4569 clips at low frequency.