AK7742 데이터 시트보기 (PDF) - Asahi Kasei Microdevices

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AK7742

24bit 2ch ADC + 24bit 4ch DAC with Audio DSP

Asahi Kasei Microdevices 

[AK7742]

DIGITAL FILTER CHARACTERISTICS

■ ADC

(Ta=-20ºC ~70ºC, AVDD=DVDD=3.0~3.6V, fs=48kHz; Note 17)

Parameter

Symbol

min

typ

max

Unit

Pass band (±0.005dB)

(Note 18) PB

0

21.5

kHz

(-0.02dB)

21.768

kHz

(-6.0dB)

24.00

kHz

Stop band

SB

26.5

kHz

Pass band ripple

(Note 18) PR

±0.005

dB

Stop band attenuation (Note 19, Note 20) SA

80

dB

Group delay distortion

∆GD

0

μs

Group delay (Ts=1/fs)

GD

30

Ts

Digital filter + Analog filter characteristics

Amplitude characteristic 20Hz~20.0kHz

±0.01

dB

Note 17. Each parameter is related to the sampling frequency (fs). HPF response is not included.

Note 18. Pass band is from DC to 21.5kHz when fs=48kHz.

Note 19. Stop band is from 26.5kHz to 3.0455MHz when fs=48kHz.

Note 20. When fs=48kHz, the analog modulator samples the analog input at 3.072MHz. Therefore the input signal is not

attenuated by the digital filter in multiple bands (n x 3.072MHz ±21.99kHz; n=0, 1, 2, 3 …) of the sampling

frequency.

■ DAC

(Ta=-20ºC ~70ºC, AVDD=DVDD=3.0~3.6V, fs=48kHz; Note 17)

Parameter

Symbol

min

typ

max

Unit

Digital filter

Pass band ±0.07dB (Note 21)

PB

0

21.7

kHz

(-6.0dB)

-

24.0

-

kHz

Stop band

(Note 21)

SB

26.2

kHz

Pass band ripple

PR

±0.01

dB

Stop band attenuation

SA

64

dB

Group delay (Ts=1/fs) (Note 22)

GD

-

24

Ts

Digital filter + Analog filter

Amplitude characteristic 0~20.0kHz

±0.5

dB

Note 21. Pass band and Stop band parameter is related to sampling frequency(fs). PB=0.4535fs (at-0.05dB),

SB=0.5465fs.

Note 22.The digital filter’s delay is calculated as the time from setting 24-bit data into the input register until an analog

signal is output.

Rev.0.5b_PB

- 10 -

2008/08

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