MAX9759 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX9759 Datasheet PDF : 20 Pages
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3.2W, High-Efficiency, Low-EMI, Filterless,
Class D Audio Amplifier
VDD
RIGHT-CHANNEL
DIFFERENTIAL
AUDIO INPUT
VDD
U1
PVDD
MAX9759 SYNC
IN+
OUT+
IN-
OUT-
SYNC_OUT
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
100
VDD = 5.0V
f = 1kHz
10 RL = 8Ω
SLAVE DEVICE
1
0.1
0.01
LEFT-CHANNEL
DIFFERENTIAL
AUDIO INPUT
VDD
U2
PVDD
MAX9759 SYNC
IN+
OUT+
IN-
SYNC_OUT
DIFFERENTIAL
AUDIO INPUT
VDD
PVDD
MAX9759 SYNC
IN+
OUT+
IN-
SYNC_OUT
0.001
0
0.5
1.0
1.5
2.0
OUTPUT POWER (W)
Figure 8. Total Harmonic Distortion Plus Noise vs. Output
Voltage
CROSSTALK vs. FREQUENCY
-30 VDD = 5V
RL = 8Ω
-50
f = 1kHz
-70
MASTER TO SLAVE
-90
-110
-130
SLAVE TO MASTER
-150
10
100
1k
10k
100k
FREQUENCY (Hz)
Figure 9. Crosstalk vs. Frequency
Figure 7. Master-Slave Configuration
Component Selection
Input Filter
An input capacitor, CIN, in conjunction with the input
impedance of the MAX9759 forms a highpass filter that
removes the DC bias from an incoming signal. The AC-
coupling capacitor allows the amplifier to bias the sig-
nal to an optimum DC level. Assuming zero source
impedance, the -3dB point of the highpass filter is
given by:
f-3dB = 1/(2πRINCIN)
Choose CIN such that f-3dB is well below the lowest fre-
quency of interest. Setting f-3dB too high affects the
low-frequency response of the amplifier. Use capaci-
tors whose dielectrics have low-voltage coefficients,
such as tantalum or aluminum electrolytic. Capacitors
with high-voltage coefficients, such as ceramics, may
result in increased distortion at low frequencies.
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