Electrical characteristics (continued) – Rainbow Electronics MAX9770 User Manual
Page 3
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
= 8
Ω, 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
= 32
Ω
40
55
V
DD
= 3.3V
R
L
= 16
Ω
40
R
L
= 32
Ω
60
Output Power
P
OUT
f = 1kHz,
THD+N = 1%
V
DD
= 5V
R
L
= 16
Ω
80
mW
R
L
= 32
Ω, P
OUT
= 50mW, f = 1kHz
0.015
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16
Ω, P
OUT
= 35mW, f = 1kHz
0.03
%
Signal-to-Noise Ratio
SNR
R
L
= 32
Ω, 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