Rainbow Electronics MAX9792 - Manual (Page 8)

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
8 _______________________________________________________________________________________
SPEAKER STARTUP WAVEFORM
MAX9791 toc13
SPKR_EN
2V/div
SPEAKER OUT
200 μs/div
SPEAKER SHUTDOWN WAVEFORM
MAX9791 toc14
SPKR_EN
2V/div
SPEAKER OUT
200 μs/div
WIDEBAND OUTPUT SPECTRUM
(SPEAKER MODE)
MAX9791 toc15
FREQUENCY (MHz)
OUTPUT AMPLITUDE (dBV)
10 1
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-120
0 100
RBW = 1kHz
INPUT AC GROUNDED
OUTPUT FREQUENCY SPECTRUM
(SPEAKER MODE)
MAX9791 toc16
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dBV)
10
-100
-60
0
-140
-80
-40
-20
-120
1 20 5 15
V OUT = -60dBV
f = 1kHz
R
L = 8 Ω
UNWEIGHTED
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.)
SPEAKER