[AK7600]

MS0999-E-00

2008/09

- 7 -

FILTER CHARACTERISTICS

(Ta= -40

∼ +85°C; AVDD=4.5∼ 5.5V, DVDD=4.5∼ 5.5V)

Parameter

Symbol

min

typ

max

Units

ADC Digital Filter (Decimation LPF):

Passband

(Note 9)

±0.1dB

−0.2dB

−3.0dB

PB

0

-

-

-

18.3

21.1

17.3

-

-

kHz

kHz

kHz

Stopband

(Note 9)

SB

25.7

-

-

kHz

Passband Ripple

PR

-

-

±0.04

dB

Stopband Attenuation

SA

68

-

-

dB

Group Delay Distortion

ΔGD

-

0

-

μs

Group Delay

(Note 10)

GD

-

16

-

1/fs

ADC Digital Filter (HPF):

Frequency Response (Note 9)

−3dB

−0.1dB

FR

-

-

0.86

5.9

-

-

Hz

Hz

DAC Digital Filter (LPF):

Passband

(Note 9)

±0.06dB

−6.0dB

PB

0

-

-

22.05

20.0

-

kHz

kHz

Stopband

(Note 9)

SB

24.1

-

-

kHz

Passband Ripple

PR

-

-

±0.02

dB

Stopband Attenuation

SA

54

-

-

dB

Group Delay Distortion

ΔGD

-

0

-

μs

Group Delay

(Note 10)

GD

-

20

-

1/fs

DAC Digital Filter + Analog Filter:

Frequency Response (Note 11)

20~20kHz

FR

-

±0.1

-

dB

Note 9. The passband and stopband frequencies scale with fs (system sampling rate). For example, when fs= 44.1kHz,

DAC is PB=0.45412*fs (@±0.06dB).

Note 10. The calculated delay time induced by digital filtering. This time is from the input of an analog signal to the

setting of 24bit data both channels to the ADC output register for ADC. This time is from the set of 24bit data to

the input registers to the output of analog signal for DAC.

Note 11. The reference frequency of these responses is 1kHz.