Owner's manual

MAX9770
1.2W Low-EMI, Filterless, Mono Class D Amplifier
with Stereo DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= CPV
DD
= 3.3V, GND = PGND = CPGND = 0V, SHDN = 3.3V, C1 = C2 = 1µF, C
BIAS
= 0.047µF, SYNC = GND, R
L
= ∞,
speaker load connected between OUT+ and OUT-, headphone load connected between HPOUT_ and GND, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS MIN TYP
MAX
UNITS
Signal-to-Noise Ratio SNR R
L
= 8Ω, V
OUT
= 2V
RMS
, A-weighted 85.9 dB
SYNC = GND 980 1100
1220
SYNC = FLOAT
1280
1450
1620
Output Switching Frequency F
S
SYNC = V
DD
1220
±120kHz
kHz
SYNC Frequency Lock Range 800
2000
kHz
Efficiency η P
O
= 1000mW, f = 1kHz 85 %
GAIN1 = 0, GAIN2 = 0 6
GAIN1 = 0, GAIN2 = 1 3
GAIN1 = 1, GAIN2 = 0 9
Gain A
V
GAIN1 = 1, GAIN2 = 1 0
dB
Gain Accuracy ±5%
Speaker Path Off-Isolation
HPS = V
DD
, headphone amplifier active,
f = 1kHz
102 dB
HEADPHONE AMPLIFIER (GAIN1 = 1, GAIN2 = 0, HPS = V
DD
)
Output Offset Voltage V
OS
±5 ±10 mV
V
DD
= 2.5V to 5.5V 65 76
V
RIPPLE
= 200mV
P-P
, f = 217kHz
85
V
RIPPLE
= 200mV
P-P
, f = 1kHz 82
Power-Supply Rejection Ratio PSRR
(Note 3)
V
RIPPLE
= 200mV
P-P
, f = 20kHz
56
dB
R
L
= 32Ω 40 55
V
DD
= 3.3V
R
L
= 16Ω 40
R
L
= 32Ω 60
Output Power P
OUT
f = 1kHz,
THD+N = 1%
V
DD
= 5V
R
L
= 16Ω 80
mW
R
L
= 32Ω, P
OUT
= 50mW, f = 1kHz
0.015
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16Ω, P
OUT
= 35mW, f = 1kHz 0.03
%
Signal-to-Noise Ratio SNR
R
L
= 32Ω, V
OUT
= 300mV
RMS
,
BW = 22Hz to 22kHz
101 dB
Crosstalk
Between channels, f = 1kHz,
V
IN
= 200mV
P-P
80 dB
Headphone Off-Isolation
HPS = GND, speaker amplifier active,
f = 1kHz
96 dB