Analog loopback, Typical operating characteristics (continued) – Rainbow Electronics MAX98089 User Manual
Page 34
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MAX98089
Low-Power, Stereo Audio Codec
with FlexSound Technology
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
DVDD
= V
DVDDS1
= V
DVDDS2
= 1.8V, V
SPKLVDD
= V
SPKRVDD
= 3.7V. Speaker loads (Z
SPK
) connected between
SPK_P and SPK_N. Receiver load (R
REC
) connected between RECP and RECN. Headphone loads (R
HP
) connected from HPL or HPR
to HPGND. Line out (R
LOUT
) connected from LOUTL or LOUTR to SPKLGND, C
REF
= 2.2FF, C
MICBIAS
= C
REG
= 1FF, C
C1N-C1P
=
1FF, C
HPVDD
= C
HPVSS
= 1FF. AV
MICPRE_
= +20dB, AV
MICPGA_
= 0dB, AV
DACATTN
= 0dB, AV
DACGAIN
= 0dB, AV
ADCLVL
= 0dB,
AV
ADCGAIN
= 0dB, AV
PGAIN_
= 0dB, AV
HP_
= 0dB, AV
REC
= 0dB, AV
SPK_
= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1. T
A
= +25NC, unless otherwise noted.)
Analog Loopback
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
(LINE TO ADC TO DAC TO HEADPHONE)
MAX98089 toc29
FREQUENCY (Hz)
10k
1k
100
0
10
100k
THD+N RATIO (dB)
-90
-80
-70
-60
-50
-40
-30
-20
-10
MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE
R
HP
= 32I
C
IN
= 10µF
P
OUT
= 0.02W
P
OUT
= 0.01W
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
(LINE TO ADC TO DAC TO HEADPHONE)
MAX98089 toc30
FREQUENCY (Hz)
10k
1k
100
10
100k
THD+N RATIO (dB)
0
-90
-80
-70
-60
-50
-40
-30
-20
-10
MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
R
HP
= 32I
C
IN
= 10µF
P
OUT
= 0.02W
P
OUT
= 0.01W
FFT, 0dBFS
(LINE TO ADC TO DAC TO HEADPHONE)
MAX98089 toc31
AMPLITUDE (dBV)
-100
-80
-60
-40
-20
0
20
-120
FREQUENCY (kHz)
18
16
2
4
6
10 12
8
14
0
20
MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE
R
HP
= 32I
C
IN
= 1µF
FFT, -60dBFS (LINE TO ADC TO DAC
TO HEADPHONE)
MAX98089 toc32
AMPLITUDE (dBV)
-120
-100
-80
-60
-40
-20
0
-140
FREQUENCY (kHz)
15
10
5
0
20
MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE
R
HP
= 32I
C
IN
= 1µF
FFT, 0dBFS (LINE TO ADC TO DAC
TO HEADPHONE)
MAX98089 toc33
FREQUENCY (kHz)
AMPLITUDE (dBV)
15
10
5
-120
-100
-80
-60
-40
-20
0
20
-140
0
20
MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
R
HP
= 32I
C
IN
= 1µF
FFT, -60dBFS (LINE TO ADC TO DAC
TO HEADPHONE)
MAX98089 toc34
AMPLITUDE (dBV)
-120
-100
-80
-60
-40
-20
0
-140
FREQUENCY (kHz)
15
10
5
0
20
MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
R
HP
= 32I
C
IN
= 1µF