Owner's manual
MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
12 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
DD
= PV
DD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN = 1. Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (R
HP
) connected from HPL or HPR to
GND. Z
SPK
= ∞, R
HP
= ∞. C1 = C2 = C
BIAS
= 1µF. T
A
= +25°C, unless otherwise noted.)
HEADPHONE AMPLIFIER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc36
FREQUENCY (Hz)
THD+N (%)
0
0.001
0.01
0.1
10 100 1k 10k 100k
V
DD
= PV
DD
= 3.7V
R
HP
= 32
Ω
P
OUT
= 10mW
P
OUT
= 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc37
FREQUENCY (Hz)
THD+N (%)
1
0.001
0.01
0.1
10 100 1k 10k 100k
V
DD
= PV
DD
= 3.7V
R
HP
= 16
Ω
P
OUT
= 20mW
P
OUT
= 40mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc38
FREQUENCY (Hz)
THD+N (%)
1
0.001
0.01
0.1
10 100 1k 10k 100k
V
DD
= PV
DD
= 3V
R
HP
= 32
Ω
P
OUT
= 10mW
P
OUT
= 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc39
FREQUENCY (Hz)
THD+N (%)
1
0.001
0.01
0.1
10 100 1k 10k 100k
V
DD
= PV
DD
= 3V
R
HP
= 16
Ω
P
OUT
= 15mW
P
OUT
= 30mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc40
OUTPUT POWER (mW)
THD+N (%)
302010
0.01
0.1
1
10
0.001
040
V
DD
= PV
DD
= 3.7V
R
HP
= 32Ω
f
IN
= 20Hz
f
IN
= 1kHz
f
IN
= 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc41
OUTPUT POWER (mW)
THD+N (%)
0.01
0.1
1
10
0.001
0 20406010 30 50 70
V
DD
= PV
DD
= 3.7V
R
HP
= 16Ω
f
IN
= 20Hz AND 1kHz
f
IN
= 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc42
OUTPUT POWER (mW)
THD+N (%)
302010
0.01
0.1
1
10
0.001
040
V
DD
= PV
DD
= 3V
R
HP
= 32
Ω
f
IN
= 20Hz
f
IN
= 1kHz
f
IN
= 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc43
OUTPUT POWER (mW)
THD+N (%)
0.01
0.1
1
10
0.001
0204010 30 50 60
V
DD
= PV
DD
= 3V
R
HP
= 16
Ω
f
IN
= 20Hz AND 1kHz
f
IN
= 6kHz