Rainbow Electronics MAX9877 - Manual (Page 14)

MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
14 ______________________________________________________________________________________
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.)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9877 toc55
FREQUENCY (Hz)
CMRR (dB)
80
0
20
40
60
10
70
30
50
10 100k 10k 1k 100
V DD = PV DD = 3.7V
CMRR = 20log(A DM /A CM )
+9dB
+20dB
0dB
HARDWARE SHUTDOWN RESPONSE
MAX9877 toc56
V BIAS
500mV/div
HPL
500mV/div
20ms/div
HPR
500mV/div
SOFTWARE SHUTDOWN
ON- AND OFF-REPSONSE
MAX9877 toc57
V BIAS
500mV/div
HPL
500mV/div
20ms/div
HPR
500mV/div
OUTPUT SPECTRUM
MAX9877 toc52
FREQUENCY (kHz)
AMPLITUDE (dBV)
0
-140
-100
-60
-20
-120
-80
-40
0 20 15 10 5
V DD = PV DD = 3.7V
f
IN
= 1kHz
R HP = 32 Ω
OUTPUT SPECTRUM
MAX9877 toc53
FREQUENCY (kHz)
AMPLITUDE (dBV)
0
-140
-100
-60
-20
-120
-80
-40
0 20 15 10 5
V DD = PV DD = 3.7V
f
IN
= 1kHz
R HP = 16 Ω
CROSSTALK vs. FREQUENCY
MAX9877 toc54
FREQUENCY (Hz)
CROSSTALK (dB)
0
-120
-30
-10
-50
-90
-60
-100
-110
-70
-20
-40
-80
10 100k 10k 1k 100
V DD = PV DD = 3.7V
V INA_ = 1V P-P
R HP = 16 Ω
HPR TO HPL
HPL TO HPR