Typical operating characteristics (continued) – Rainbow Electronics MAX9877 User Manual
Page 15
MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
______________________________________________________________________________________
15
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.)
ANALOG SWITCH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc58
OUTPUT POWER (mW)
THD+N (%)
10
0.01
0.1
1
0
100
75
50
25
EXTERNAL CLASS AB AMPLIFIER
CONNECTED DIRECTLY TO RXIN+
AND RXIN-
f = 6kHz
f = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc59
OUTPUT POWER (mW)
THD+N (%)
10
0.001
1
0.1
0.01
0
80
60
40
20
70
50
30
10
EXTERNAL CLASS AB AMPLIFIER
CONNECTED WITH 9
Ω RESISTORS
IN SERIES WITH RXIN+ AND RXIN-
f = 6kHz
f = 20Hz AND 1kHz