Owner's manual

MAX9770
1.2W Low-EMI, Filterless, Mono Class D Amplifier
with Stereo DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 9
EXITING SHUTDOWN
(HEADPHONE MODE)
MAX9770 toc40
2µs/div
2V/divSHDN
OUT_
10mV/div
R
L
= 32Ω
ENTERING SHUTDOWN
(HEADPHONE MODE)
MAX9770 toc41
2µs/div
2V/divSHDN
OUT_
10mV/div
R
L
= 32Ω
0
2
6
4
8
10
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9770 toc42
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
2.5 4.53.5 5.5
SPEAKER MODE
HEADPHONE MODE
0
0.1
0.3
0.2
0.4
0.5
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9770 toc43
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
2.5 4.53.5 5.5
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, BW = 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase.)
Pin Description
PIN
TQFN
TSSOP
NAME FUNCTION
1 4 BIAS Common-Mode Bias Voltage. Bypass with a 0.047µF capacitor to GND.
25 V
DD
Power Supply
3 6 HPOUTR Right-Channel Headphone Output
4 7 HPOUTL Left-Channel Headphone Output
58 SV
SS
Headphone Amplifier Negative Power Supply
6 9 HPS Headphone Sense Input