
Stereo Audio CODEC
with FlexSound Technology
MAX9888
49
Typical Operating Characteristics (continued)
(VAVDD = VHPVDD = VDVDD = VDVDDS1 = VDVDDS2 = +1.8V, VSPKLVDD = VSPKRVDD = 3.7V. Speaker loads (ZSPK) connected
between SPK_P and SPK_N. Receiver load (RREC) connected between RECP and RECN. Headphone loads (RHP) connected from
HPL or HPR to GND. RHP = J, RREC = J, ZSPK = J, CREF = 2.2FF, CMICBIAS = CPREG = CREG = 1FF, CC1N-C1P = 1FF, CHPVSS
= 1FF. AVMICPRE_ = +20dB, AVMICPGA_ = 0dB, AVDACATTN = 0dB, AVDACGAIN = 0dB, AVADCLVL = 0dB, AVADCGAIN = 0dB,
AVPGAIN_ = 0dB, AVPGAOUT_ = 0dB, AVHP_ = 0dB, AVREC = 0dB, AVSPK_ = 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =
1. TA = +25NC, unless otherwise noted.)
Speaker Bypass Switch
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
(SPEAKER BYPASS SWITCH)
OUTPUT POWER (W)
THD+N
RATIO
(dB)
0.15
0.20
0.10
0.05
-70
-60
-50
-40
-30
-20
-10
0
-80
0
MAX9888
toc110
RECEIVER AMPLIFIER DRIVING
LOUDSPEAKER
ZSPK = 8I + 68H
f = 1000Hz
f = 100Hz
f = 6000Hz
ON RESISTANCE vs. VCOM
(SPEAKER BYPASS SWITCH)
MAX9888
toc111
VCOM (V)
R ON
(I
)
5
4
1
2
3
0.5
1.0
1.5
2.0
2.5
3.0
3.5
ISW = 20mA
VSPK_VDD = 3.0V
VSPK_VDD = 3.7V
VSPK_VDD = 4.2V
VSPK_VDD = 5.0V
4.0
0
6
OFF-ISOLATION vs. FREQUENCY
(SPEAKER BYPASS SWITCH)
MAX9888
toc112
FREQUENCY (Hz)
OFF-ISOLATION
(dB)
10,000
1000
100
-100
-80
-60
-40
-20
0
-120
10
100,000
SPEAKER AMP DRIVING LOUDSPEAKER
SPEAKER BYPASS SWITCH OPEN
MEASURED AT RXIN_
50I LOAD ON RXIN_
RECEIVER AMP DRIVING RXIN_