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AK7755EN Arkusz danych(PDF) 18 Page - Asahi Kasei Microsystems |
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AK7755EN Arkusz danych(HTML) 18 Page - Asahi Kasei Microsystems |
18 / 109 page [AK7755] 014006643-E-00 2014/10 - 18 - ■ Digital Filter Characteritics 1. ADC (Ta= -40 to 85C; AVDD=3.0 to 3.6V, TVDD=1.7 to 3.6V, DVDD=1.14 to 1.3V, AVSS=DVSS=0V, fs=48kHz (Note 26)) Parameter Symbol min typ max Unit Passband (Note 27) +0.14dB ~ 0.12dB PB 0 20.7 kHz -0.87dB 21.6 kHz -3.0dB 22.8 kHz Stoppband SB 28.4 kHz Passband Ripple (Note 27) PR ±0.14 dB Stopband Ripple (Note 28, Note 29) SA 65 dB Group Delay Distorsion △GD 0 μs Group Daley (Ts=1/fs) GD 12.5 Ts Note 26. The passband and stopband frequencies scale with “fs” (system sampling rate). The characteristic of the high pass filter is not included. Note 27. The passband is from DC to 18.9kHz when fs=48kHz. Note 28. The stopband is 28kHz to 3.044MHz when fs=48kHz. Note 29. 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 ±21.99kHz; n=0, 1, 2, 3…) of integer times of the sampling frequency by the digital filter. 2. DAC (Ta= -40 to 85C; AVDD=3.0 to 3.6V, TVDD=1.7 to 3.6V, DVDD=1.14 to 1.3V, AVSS=DVSS=0V, fs=48kHz) Parameter Symbol min Typ max Unit Passband (Note 30) (±0.05dB) PB 0 21.7 kHz (-6.0dB) 24 kHz Stopband (Note 30) SB 26.2 kHz Passband Ripple PR ±0.05 dB Stopband Attenuation SA 64 dB Group Delay (Ts=1/fs) (Note 31) GD 24 Ts Digital Filter + Analog Filter Amplitude Characteristics 20Hz to 20.0kHz ±0.5 dB Note 30. The passband and stopband frequencies are proportional to “fs” (system sampling rate), and represents PB=0.4535 × fs(@0.05dB) and SB=0.5465 × fs, respectively. Note 31. The digital filter delay is calculated as the time from setting data into the input register until an analog signal is output. |
Podobny numer części - AK7755EN_16 |
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Podobny opis - AK7755EN_16 |
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