Rainbow Electronics MAX9877 - Manual (Page 10)

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)
15 10 5
0
-140
-80
-40
-120
-20
-60
-100
0 20
f OSC = 1100kHz
f IN = 1kHz
IN-BAND OUTPUT SPECTRUM
MAX9877 toc29
FREQUENCY (kHz)
AMPLITUDE (dBV)
15 10 5
0
-140
-80
-40
-120
-20
-60
-100
0 20
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 1000 600 400 800 200
V DD = PV DD = 3V
f IN = 1kHz
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
Z SPK = 8 Ω + 68μH Z SPK = 4 Ω + 33μH
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877 toc23
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
5.0 4.5 4.0 3.5 3.0
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 = 4 Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877 toc24
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
5.0 4.5 4.0 3.5 3.0
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 = 8 Ω + 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
0 100 70 40 10 80 50 20 90 60 30
V DD = PV DD = 3.7V
f IN = 1kHz
Z SPK = LOAD + 68 μH
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
0 100 70 40 10 80 50 20 90 60 30
V DD = PV DD = 3V
f IN = 1kHz
Z SPK = LOAD + 68 μH
10% THD+N
1% THD+N
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9877 toc27
FREQUENCY (Hz)
PSRR (dB)
10k 1k 100
-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