Datasheet

MAX98090 Ultra-Low Power Stereo Audio Codec
Maxim Integrated │ 38
www.maximintegrated.com
Typical Operating Characteristics (continued)
(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
) con-
nected 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)
ANALOG MICROPHONE INPUT TO ADC RECORD PATH OUTPUT (CONTINUED)
GAIN vs. FREQUENCY (MIC TO ADC)
MAX98090 toc07
FREQUENCY (Hz)
NORMALIZED GAIN (dB)
1k10010 10k
4
5
-5
-4
-3
-2
-1
0
1
2
3
f
MCLK
= 13MHz
f
LRCLK
= 8kHz
V
IN
= 707mV
RMS
A
V_MIC
= 0dB
C
IN
= 10µF
0
20
40
60
80
100
120
10 100 1,000 10,000 100,000
POWER-SUPPLY REJECTION RATIO (dB)
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPK_VDD to MICBIAS)
BIAS_MODE = 1
MAX98090 toc10
V
SPK_VDD
= 3.7V
V
MICBIAS
= 2.8V
BIAS_MODE = 0
COMMON-MODE REJECTION
RATIO vs. FREQUENCY (MIC TO ADC)
MAX98090 toc08
FREQUENCY (Hz)
100
90
10
CMRR (dB)
0
10
20
30
40
50
60
70
80
100k10k1k100
f
MCLK
= 12.288MHz
f
LRCLK
= 48kHz
C
IN
= 10µF
A
V_MIC
= +20dB
A
V_MIC
= +30dB
A
V_MIC
= +0dB
INBAND OUTPUT SPECTRUM,
-3dBFS INPUT (MIC TO ADC)
MAX98089 toc11
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dBFS)
-140
-120
-100
-80
-60
-40
-20
0
20
-160
0
500 1000 20001500 2500 3000 40003500
f
MCLK
= 13MHz
f
LRCLK
= 8kHz
A
V_MIC
= 0dB
C
IN
= 10µF
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (MIC TO ADC)
MAX98090 toc09
FREQUENCY (Hz)
100
90
10
PSRR (dB)
0
10
20
30
40
50
60
70
80
100k10k1k100
f
MCLK
= 12.288MHz
f
LRCLK
= 48kHz
V
RIPPLE
= 100mV
P-P
C
IN
= 10µF
INBAND OUTPUT SPECTRUM,
-60dBFS INPUT (MIC TO ADC)
MAX98090 toc12
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dBFS)
-140
-120
-100
-80
-60
-40
-20
0
20
-160
0
500 1000 20001500 2500 3000 40003500
f
MCLK
= 13MHz
f
LRCLK
= 8kHz
A
V_MIC
= 0dB
C
IN
= 10µF