Rainbow Electronics MAX9770 - Manual (Page 6)

MAX9770
1.2W Low-EMI, Filterless, Mono Class D Amplifier
with Stereo DirectDrive Headphone Amplifiers
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, BW = 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase.)
0
30
20
10
40
50
60
70
80
90
100
0 0.4 0.2 0.6 0.8 1.0
EFFICIENCY vs. OUTPUT POWER
MAX9770 toc13
OUTPUT POWER (W)
EFFICIENCY (%)
R L = 8 Ω
R L = 4 Ω
f = 1kHz
0
-10
-20
-30
-40
-50
-60
-70
-80
10 1k 10k 100 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
MAX9770 toc14
FREQUENCY (Hz)
PSRR (dB)
V RIPPLE = 200mV P-P
R L = 8 Ω
-140
-100
-120
-60
-80
-20
-40
0
OUTPUT SPECTRUM
(SPEAKER MODE)
MAX9770 toc15
FREQUENCY (kHz)
MAGNITUDE (dB)
0 5 10 15 20
R L = 8 Ω
f = 1kHz
FFM MODE
V
IN = -60dBV
-140
-100
-120
-60
-80
-20
-40
0
OUTPUT SPECTRUM
(SPEAKER MODE)
MAX9770 toc16
FREQUENCY (kHz)
MAGNITUDE (dB)
0 5 10 15 20
R L = 8 Ω
f = 1kHz
SSM MODE
V
IN = -60dBV
-160
-100
-120
-140
-60
-80
-20
-40
0
OUTPUT SPECTRUM
(SPEAKER MODE)
MAX9770 toc17
FREQUENCY (kHz)
MAGNITUDE (dB)
0 5 10 15 20
R L = 8 Ω
f = 1kHz
SSM MODE
A-WEIGHTED
V
IN = -60dBV
0
-100
1M 10M 100M
WIDEBAND OUTPUT SPECTRUM
(SPEAKER MODE)
-80
MAX9770 toc18
FREQUENCY (Hz)
MAGNITUDE (dB)
-60
-40
-20
-30
-50
-70
-90
-10
FFM MODE
RBW = 10kHz
0
-100
1M 10M 100M
WIDEBAND OUTPUT SPECTRUM
(SPEAKER MODE)
-80
MAX9770 toc19
FREQUENCY (Hz)
MAGNITUDE (dB)
-60
-40
-20
-30
-50
-70
-90
-10
SSM MODE
RBW = 10kHz
STARTUP WAVEFORM
(SPEAKER MODE)
MAX9770 toc20
4ms/div
2V/div SHDN
OUT+ - OUT- 500mV/div
R L = 8 Ω
f = 1kHz
MIXER OUTPUT
MAX9770 toc21
400 µs/div
10kHz
1V/div
4kHz
1V/div
1kHz
2V/div
IN_1
IN_2
MONO
OUT 1V/div