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AK7757 Datasheet(PDF) 13 Page - Asahi Kasei Microsystems |
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AK7757 Datasheet(HTML) 13 Page - Asahi Kasei Microsystems |
13 / 24 page [AK7757] MS1489-E-02-PB 13 2013/07 ■ ADC Block (ADC1/2) 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. ■ DAC1-4 (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 |
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