2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
5/MAX976
ELECTRICAL CHARACTERISTICS (continued)
(V
= PV
= CPV
= 3.3V, V
= V
= V
= 0V, SHDN = V , I2C settings (INA gain = +20dB, INB gain = INC gain =
DD
DD
DD
GND
PGND
CPGND DD
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
) are terminated between
LSP
OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise noted. C1 = C2 = C3 = 1µF. T = T
to
A
MIN
T
MAX
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SPEAKER AMPLIFIERS
T
T
= +25°C
±5.5
±23.5
±40
A
Output Offset Voltage
V
mV
OS
≤ T ≤ T
MAX
MIN
A
Peak voltage,
T = +25°C,
A-weighted, 32
samples per second
(Notes 2, 3)
Into shutdown
-62
-60
A
Out of shutdown
Into mute
Click-and-Pop Level
K
CP
dB
-63
-62
70
Out of mute
V
= 2.7V to 5.5V
4±
DD
f = 217Hz,
100mV
6±
60
50
ripple
ripple
ripple
P-P
Power-Supply Rejection Ratio
(Note 3)
PSRR
T = +25°C
A
dB
f = 1kHz,
100mV
P-P
f = 20kHz,
100mV
P-P
R = 4Ω, V
= 5V
1500
450
L
DD
DD
DD
THD+N = 1%,
= +25°C
Output Power (Note 4)
Current Limit
P
R = ±Ω, V
L
= 3.3V
= 5V
mW
A
OUT
T
A
R = ±Ω, V
L
1115
1.6
R = ±Ω,
L
0.03
0.04
P
= 125mW
OUT
Total Harmonic Distortion Plus
Noise (Note 4)
THD+N
SNR
f = 1kHz
%
R = 4Ω,
L
P
= 250mW
OUT
V
= 1.±V
,
OUT
RMS
BW = 20Hz to 20kHz
A-weighted
±1
±4
Signal-to-Noise Ratio
Output Frequency
dB
R = ±Ω, 3D not
L
active (Note 3)
Fixed-frequency modulation
Spread-spectrum modulation
1100
f
kHz
OSC
1100 ±30
P
= 470mW, f = 1kHz both channels
OUT
Efficiency
Gain
η
79
12
±1
%
dB
%
driven, L = 6±µH in series with ±Ω load
A
V
Channel-to-Channel Gain
Tracking (Note 5)
T
= +25°C
A
Used with 22nF and 2.2nF external
capacitors
3D Sound Resistors (Note 5)
Crosstalk (Notes 4, 5)
R
5
7
9
kΩ
3D
L to R, R to L, f = 10kHz, R = ±Ω,
L
73
dB
V
= 300mV
OUT
RMS
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