Datasheet

Maxim Integrated │ 30
MAX98090 Ultra-Low Power Stereo Audio Codec
www.maximintegrated.com
Digital Microphone Timing Characteristics
(V
AVDD
= V
HPVDD
= V
DVDDIO
= 1.8V, V
DVDD
= 1.2V, V
SPKLVDD
= V
SPKRVDD
= V
SPKVDD
= 3.7V. Receiver load (R
RCV
) connected
between RCVP/LOUTL and RCVN/LOUTR (LINMOD = 0). Line output loads (R
LOUT
) connected between from RCVP/LOUTL and
RCVN/LOUTR to GND (LINMOD = 1). Headphone loads (R
HP
) connected from HPL or HPR to GND. Speaker loads (Z
SPK
) connected
between SPK_P and SPK_N. R
RCV
= J, R
LOUT
= J, R
HP
= J, Z
SPK
= J. C
REF
= 2.2µF, C
BIAS
= C
MICBIAS
= 1µF, C
C1N-C1P
=
C
CPVDD
= C
CPVSS
= 1µF. A
V_MICPRE_
= A
V_MICPGA_
= A
V_LINEPGA_
= 0dB, A
V_ADCLVL
= A
V_ADCGAIN
= 0dB, A
V_DACLVL
=
A
V_DACGAIN
= 0dB, A
V_MIXGAIN
= 0dB, A
V_RCV
= A
V_LOUT
= A
V_HP
= A
V_SPK
= 0dB. f
MCLK
= 12.288MHz, f
LRCLK
= 48kHz, MAS =
0, 20-bit source data. T
A
= T
MIN
to T
MAX
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
Note 2: The MAX98090 is 100% production tested at T
A
=+25°C. Specifications over temperature limits are guaranteed by design.
Note 3: BIAS derived from a bandgap reference (BIAS_MODE = 1).
Note 4: Analog supply current = AVDD + HPVDD, speaker supply current = SPKLVDD + SPKRVDD, and digital supply current =
DVDD + DVDDIO.
Note 5: Dynamic range measurements are performed with the EIAJ method (a -60dBFS output signal at 1kHz, A-weighted and nor-
malized to 0dBFS; f = 20Hz – 20kHz).
Note 6: Gain measured relative to the 0dB setting.
Note 7: Performance measured using DAC Inputs, unless otherwise stated.
Note 8: Full-scale analog output with 0dB of programmable gain, and a 0dBFS DAC input amplitude, a 1V
RMS
differential analog
input amplitude, or a 0.5V
RMS
single-ended analog input amplitude.
Note 9: Performance measured using an analog input to amplifier output path.
Note 10: Digital filter performance is invariant over temperature and production tested at T
A
= +25°C.
Note 11: The filter specification is accurate only for synchronous clocking modes (integer MCLK to LRCLK ratio).
Note 12: f
LRCLK
may be any rate in the indicated range. Asynchronous and non-integer f
MCLK
/f
LRCLK
ratios can exhibit some full-
scale performance degradation compared to synchronous integer ratios.
Note 13: In master-mode operation, the accuracy of the MCLK input proportionally determines the accuracy of the sample clock rate.
Note 14: C
B
is in pF.
Figure 4. Digital Microphone Timing Diagram
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL MICROPHONE TIMING CHARACTERISTICS
DMC Frequency f
DMC
MICCLK = 000 f
PCLK
/2
MHz
MICCLK = 001 f
PCLK
/3
MICCLK = 010 f
PCLK
/4
MICCLK = 011 f
PCLK
/5
MICCLK = 100 f
PCLK
/6
MICCLK = 101 f
PCLK
/8
DMD to DMC Setup Time t
SU,MIC
Either clock edge 20 ns
DMD to DMC Hold Time t
HD,MIC
Either clock edge 0 ns
1/f
DMC
t
HD,MIC
t
SU,MIC
t
HD,MIC
t
SU,MIC
LEFT
DMC
DMD RIGHT LEFT RIGHT