Owner's manual

MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
10 ______________________________________________________________________________________
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.)
IN-BAND OUTPUT SPECTRUM
MAX9877 toc28
FREQUENCY (kHz)
AMPLITUDE (dBV)
15105
0
-140
-80
-40
-120
-20
-60
-100
020
f
OSC
= 1100kHz
f
IN
= 1kHz
IN-BAND OUTPUT SPECTRUM
MAX9877 toc29
FREQUENCY (kHz)
AMPLITUDE (dBV)
15105
0
-140
-80
-40
-120
-20
-60
-100
020
f
OSC
= 700kHz
f
IN
= 1kHz
EFFICIENCY
vs. OUTPUT POWER
MAX9877 toc22
OUTPUT POWER (mW)
EFFICIENCY (%)
100
0
50
60
10
80
30
70
20
90
40
0 1000600400 800200
V
DD
= PV
DD
= 3V
f
IN
= 1kHz
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
Z
SPK
= 8Ω + 68μH
Z
SPK
= 4Ω + 33μH
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877 toc23
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
5.04.54.03.53.0
2.0
2.5
0.5
1.0
1.5
3.0
3.5
0
2.5 5.5
10% THD+N
1% THD+N
V
DD
= PV
DD
Z
SPK
= 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877 toc24
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
5.04.54.03.53.0
2.0
0.2
0.8
0.6
1.2
1.0
1.6
0.4
1.8
1.4
0
2.5 5.5
V
DD
= PV
DD
Z
SPK
= 8Ω + 68μH
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877 toc25
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
1.8
0.2
0.8
0.6
1.2
1.0
1.6
0.4
1.4
0
0 100704010 805020 906030
V
DD
= PV
DD
= 3.7V
f
IN
= 1kHz
Z
SPK
= LOAD + 68μH
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877 toc26
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
1.2
0.2
0.8
0.6
1.0
0.4
0
0 100704010 805020 906030
V
DD
= PV
DD
= 3V
f
IN
= 1kHz
Z
SPK
= LOAD + 68μH
10% THD+N
1% THD+N
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9877 toc27
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-90
-70
-60
-40
-30
-10
-80
-50
-20
0
-100
10 100k
V
DD
= PV
DD
= 3.7V
V
RIPPLE
= 100mV
P-P
INPUTS AC-COUPLED TO GND