Owner's manual
MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
8 _______________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc10
FREQUENCY (Hz)
THD+N (%)
10k1k100
1
0.1
0.01
10 100k
V
DD
= PV
DD
= 3.7V
P
OUT
= 200mW
Z
SPK
= 8Ω + 68μH
f
OSC
= 700kHz
f
OSC
= 1176kHz
f
OSC
= 1100kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc11
OUTPUT POWER (W)
THD+N (%)
1.51.00.5
0.1
1
10
0.01
0 2.0
f
IN
= 20Hz
f
IN
= 1kHz
f
IN
= 6kHz
V
DD
= PV
DD
= 5V
Z
SPK
= 8Ω + 68μH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc12
OUTPUT POWER (W)
THD+N (%)
1.5
0.1
1
10
0.01
0 2.51.0 3.00.5 2.0
V
DD
= PV
DD
= 5V
Z
SPK
= 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
f
IN
= 6kHz
f
IN
= 20Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc13
OUTPUT POWER (mW)
THD+N (%)
0.1
1
10
0.01
0 1000600400 800200
f
IN
= 6kHz
f
IN
= 20Hz
f
IN
= 1kHz
V
DD
= PV
DD
= 3.7V
Z
SPK
= 8Ω + 68μH
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.)
SPEAKER AMPLIFIER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
V
DD
= PV
DD
= 3.7V
Z
SPK
= 8Ω + 68μH
P
OUT
= 200mW
P
OUT
= 675mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
V
DD
= PV
DD
= 3.7V
Z
SPK
= 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
P
OUT
= 1100mW
P
OUT
= 650mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc08
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
P
OUT
= 425mW
P
OUT
= 200mW
V
DD
= PV
DD
= 3V
Z
SPK
= 8Ω + 68μH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc09
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
P
OUT
= 700mW
P
OUT
= 250mW
V
DD
= PV
DD
= 3V
Z
SPK
= 4Ω + 33μH