Rainbow Electronics MAX9792 - Manual (Page 11)

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
______________________________________________________________________________________ 11
-130
-90
-110
-50
-70
-30
-10
500 1500 1000 2000 2500 3000
HEADPHONE RF IMMUNITY
vs. FREQUENCY
MAX9791 toc35
FREQUENCY (MHz)
AMPLITUDE (dBV)
LEFT
RIGHT
R L = 32 Ω
MAX9791 toc34
HP_EN
2V/div
HP_
500mV/div
200 μs/div
SHUTDOWN WAVEFORM
HEADPHONE
Typical Operating Characteristics (continued)
(V AVDD = V PVDD = V HPVDD = 5V, V GND = V PGND = V CPGND = 0, I LDO_OUT = 0, C LDO = 2 x 1µF, C1 = C2 = 1µF. R L =
∞, unless oth-
erwise specified. R IN1 = 20k
Ω (A
VSPKR = 12dB), R IN2 = 40.2k
Ω (A
VHP = 0dB), C IN1 = 470nF, C IN2 = C COM = 1µF, measurement BW
= 20kHz AES17, T A = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)