ASAHI KASEI

[AK4555]

MS0363-E-01

2005/08

- 6 -

FILTER CHARACTERISTICS

(Ta=25

°C; VDD=1.6 ∼ 3.6V; fs=44.1kHz; DEM1 pin = “L”, DEM0 pin = “H”)

Parameter

Symbol

min

typ

max

Units

ADC Digital Filter (Decimation LPF):

Passband

(Note 6)

±0.1dB

PB

0

-

17.4

kHz

−1.0dB

-

20.0

-

kHz

−3.0dB

-

21.1

-

kHz

Stopband

SB

25.7

-

-

kHz

Passband Ripple

PR

-

-

±0.1

dB

Stopband Attenuation

SA

65

-

-

dB

Group Delay

(Note 7)

GD

-

17.0

-

1/fs

Group Delay Distortion

∆GD

-

0

-

µs

ADC Digital Filter (HPF):

Frequency Response

(Note 6)

−3dB

FR

-

3.4

-

Hz

−0.5dB

-

10

-

Hz

−0.1dB

-

22

-

Hz

DAC Digital Filter:

Passband

(Note 6)

±0.05dB

PB

0

-

20.0

kHz

−6.0dB

-

22.05

-

kHz

Stopband

SB

24.1

-

-

kHz

Passband Ripple

PR

-

-

±0.02

dB

Stopband Attenuation

SA

54

-

-

dB

Group Delay

(Note 7)

GD

-

19.0

-

1/fs

DAC Digital Filter + Analog Filter:

Frequency Response

0

∼ 20.0kHz

FR

-

±0.5

-

dB

Note 6. The passband and stopband frequencies scale with fs (sampling frequency). For examples, PB=20.0kHz(@ADC:

−1.0dB, DAC: −0.1dB) are 0.454 x fs.

Note 7. 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.

DC CHARACTERISTICS

(Ta=25

°C; VDD=1.6 ∼ 3.6V)

Parameter

Symbol

min

typ

max

Units

High-Level Input Voltage

2.2V

≤VDD≤3.6V

VIH

70

%VDD

-

-

V

1.6V

≤VDD<2.2V

VIH

80

%VDD

-

-

V

Low-Level Input Voltage

2.2V

≤VDD≤3.6V

VIL

-

-

30

%VDD

V

1.6V

≤VDD<2.2V

VIL

-

-

20

%VDD

V

High-Level Output Voltage

(Iout=

−20µA)

VOH

VDD

−0.1

-

-

V

Low-Level Output Voltage

(Iout= 20

µA)

VOL

-

-

0.1

V

Input Leakage Current

Iin

-

-

±10

µA