MAX9867 datasheet(6/55 Pages) MAXIM

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Ultra-Low Power Stereo Audio Codec

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PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ADC VOICE MODE DIGITAL 5th ORDER IIR HIGHPASS FILTER

AVFLT = 0x1

(elliptical tuned for 16kHz GSM + 217Hz

notch)

0.0161

x fS

AVFLT = 0x2

(500Hz Butterworth tuned for 16kHz)

0.0312

x fS

AVFLT = 0x3

(elliptical tuned for 8kHz GSM + 217Hz

notch)

0.0321

x fS

AVFLT = 0x4

(500Hz Butterworth tuned for 8kHz)

0.0625

x fS

5th Order Passband Cutoff

(-3dB from Peak, I

2C Register

Programmable)

fAHPPB

AVFLT = 0x5

(fS/240 Butterworth)

0.0042

x fS

AVFLT = 0x1

(elliptical tuned for 16kHz GSM + 217Hz

notch)

0.0139

x fS

AVFLT = 0x2

(500Hz Butterworth tuned for 16kHz)

0.0156

x fS

AVFLT = 0x3

(elliptical tuned for 8kHz GSM + 217Hz

notch)

0.0279

x fS

AVFLT = 0x4

(500Hz Butterworth tuned for 8kHz)

0.0312

x fS

Stopband Cutoff (-30dB from

Peak)

fAHPSB

AVFLT = 0x5

(fS/240 Butterworth)

0.0021

x fS

DC Attenuation

DCATTEN

AVFLT

≠ 000

ADC STEREO AUDIO MODE DIGITAL FIR LOWPASS FILTER

With respect to fS within ripple;

fS = 8kHz to 48kHz

0.43 x

-3dB cutoff

0.48 x

Passband Cutoff

fPLP

-6.02dB cutoff

0.5 x fS

Passband Ripple

f < fPLP

±0.1

Stopband Cutoff

fSLP

With respect to fS; fS = 8kHz to 48kHz

0.58 x

Stopband Attenuation

f > fSLP, f = 20Hz to 20kHz

ELECTRICAL CHARACTERISTICS (continued)

(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential

mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =

0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)

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