[AK7757]

MS1489-E-02-PB

13

2013/07

1. fs=48kHz

(Ta=-40ºC ~85ºC, AVDD=DVDD=3.0~3.6V, fs=48kHz, Note 21)

Parameter

Symbol

min

typ

max

Unit

Passband

(±0.1dB) (Note 22)

(-0.2dB)

(-3.0dB)

PB

0

20.0

23.0

18.9

kHz

kHz

kHz

Stopband

SB

28

kHz

Passband Ripple

(Note 22)

PR

±0.04

dB

Stopband Attenuation (Note 23, Note 24)

SA

68

dB

Group Delay Distortion

ΔGD

0

μs

Group Delay

(Ts=1/fs)

GD

16

Ts

Note 21. The passband and stopband frequencies are proportional to fs (system sampling rate). High-pass filter

characteristics are not included.

Note 22. The passband is from DC to 18.9kHz when fs=48kHz.

Note 23. The stopband is 28kHz to 3.044MHz when fs=48kHz.

Note 24. When fs = 48kHz, the analog modulator samples the input signal at 3.072MHz. There is no attenuation of an

input signal in band (n x 3.072MHz ±28kHz; n=0, 1, 2, 3…) of integer times of the sampling frequency by the

digital filter.

(Ta=-40ºC ~85ºC; AVDD=DVDD=3.0~3.6V; fs=48kHz; DEM=OFF)

Parameter

Symbol

min

typ

max

Unit

Passband (±0.05dB) (Note 25)

(-6.0dB)

PB

0

24

21.7

kHz

kHz

Stopband

(Note 25)

SB

26.2

kHz

Passband Ripple

PR

±0.01

dB

Stopband Attenuation

SA

64

dB

Group Delay (Ts=1/fs) (Note 26)

GD

24

Ts

Digital Filter + Analog Filter

Amplitude Characteristics 20Hz~20.0kHz

±0.5

dB

Note 25. The pass band and stop band frequencies are proportional to “fs” (system sampling rate), and represents

PB=0.4535fs (@±0.05dB) and SB=0.5465fs, respectively.

Note 26. The digital filter delay is calculated as the time from setting data into the input register until an analog signal is

output.

DIGITAL FILTER CHARACTERISTICS