
MAX9875
Typical Operating Characteristics (continued)
(VDD = VPVDD = 3.7V, VGND = VPGND = 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. ZSPK =
∞, RHP = ∞. C1 = C2 = CBIAS = 1F. TA = +25°C, unless otherwise noted.)
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
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11
IN-BAND OUTPUT SPECTRUM
MAX9875
toc30
FREQUENCY (kHz)
AMPLITUDE
(dBV)
15
10
5
0
-140
-80
-40
-120
-20
-60
-100
020
fOSC = 1176kHz
fIN = 1kHz
WIDEBAND OUTPUT SPECTRUM
MAX9875
toc31
FREQUENCY (MHz)
AMPLITUDE
(dBV)
0
-70
-40
-50
-20
-80
-60
-90
-30
-10
-100
0.1
10
100
1
fOSC = 1100kHz
INPUTS AC-COUPLED TO GND
WIDEBAND OUTPUT SPECTRUM
MAX9875
toc32
FREQUENCY (MHz)
AMPLITUDE
(dBV)
0
-70
-40
-50
-20
-80
-60
-90
-30
-10
-100
0.1
10
100
1
fOSC = 700kHz
INPUTS AC-COUPLED TO GND
WIDEBAND OUTPUT SPECTRUM
MAX9875
toc33
FREQUENCY (MHz)
AMPLITUDE
(dBV)
0
-70
-40
-50
-20
-80
-60
-90
-30
-10
-100
0.1
10
100
1
fOSC = 1176kHz
INPUTS AC-COUPLED TO GND
HARDWARE SHUTDOWN RESPONSE
MAX9875
toc34
VBIAS
500mV/div
20ms/div
OUT+ - OUT-
1V/div
SOFTWARE SHUTDOWN
ON- AND OFF-RESPONSE
MAX9875
toc35
VSDA
2V/div
20ms/div
OUT+ - OUT-
1V/div