ASAHI KASEI

[AK4523]

M0021-E-03

1999/12

- 6 -

FILTER CHARACTERISTICS

(Ta=25

°C; VA=4.5 ~ 5.5V, VD=3.0 ~ 5.5V; DEM0=”1”, DEM1=”0”)

Parameter

Symbol

min

typ

max

Units

ADC Digital Filter (Decimation LPF):

Passband

(Note 11)

-0.005dB

-0.02dB

-0.06dB

-6.0dB

PB

0

0

0

0

19.76

20.02

20.20

22.05

kHz

kHz

kHz

kHz

Stopband

SB

24.34

kHz

Passband Ripple

PR

±0.005

dB

Stopband Attenuation

SA

80

dB

Group Delay

(Note 12)

GD

29.3

1/fs

Group Delay Distortion

DGD

0µs

ADC Digital Filter (HPF):

Frequency Response

(Note 5)

-3dB

-0.5dB

-0.1dB

FR

0.9

2.7

6.0

Hz

Hz

Hz

DAC Digital Filter:

Passband

(Note 11)

-0.06dB

-6.0dB

PB

0

0

20.0

22.05

kHz

kHz

Stopband

SB

24.1

kHz

Passband Ripple

PR

±0.06

dB

Stopband Attenuation

SA

43

dB

Group Delay

(Note 12)

GD

14.7

1/fs

DAC Digital Filter + Analog Filter:

Frequency Response:

0

~ 20.0kHz

FR

-

±0.2

-dB

Note:11. The passband and stopband frequencies scale with fs.

For example, 20.02kHz at -0.02dB is 0.454 x fs. The reference frequency of these responses is 1kHz.

12. The calculating delay time which occurred by digital filtering. This time is from the input of analog signal to

setting the 20bit data of both channels to the output register for ADC.

For DAC, this time is from setting the 20bit data of both channels on input register to the output of analog

signal.