MAX9759 Maxim Integrated Products, MAX9759 Datasheet - Page 15

• Manufacturer Part Number: MAX9759
• Description: 3.2W High-Efficiency Low-EMI Filterless Class D Audio Amplifier
• Manufacturer: Maxim Integrated Products

An input capacitor, C
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:
Figure 7. Master-Slave Configuration
RIGHT-CHANNEL
LEFT-CHANNEL
DIFFERENTIAL
DIFFERENTIAL
DIFFERENTIAL
AUDIO INPUT
AUDIO INPUT
AUDIO INPUT
3.2W, High-Efficiency, Low-EMI, Filterless,
V
DD
______________________________________________________________________________________
V
IN+
IN-
V
IN+
IN-
V
IN+
IN-
DD
DD
DD
IN
, in conjunction with the input
MAX9759
MAX9759
MAX9759
Component Selection
U1
U2
SYNC_OUT
SYNC_OUT
SYNC_OUT
SYNC
SYNC
SYNC
OUT+
OUT+
OUT+
PV
PV
PV
OUT-
DD
DD
DD
Input Filter
Class D Audio Amplifier
Choose C
quency of interest. Setting f
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.
Figure 8. Total Harmonic Distortion Plus Noise vs. Output
Voltage
Figure 9. Crosstalk vs. Frequency
0.001
IN
-110
-130
0.01
-150
100
-30
-50
-70
-90
0.1
10
1
such that f
TOTAL HARMONIC DISTORTION PLUS NOISE
10
0
V
R
f = 1kHz
V
f = 1kHz
R
SLAVE DEVICE
DD
L
f
DD
L
MASTER TO SLAVE
-3dB
= 8Ω
= 8Ω
CROSSTALK vs. FREQUENCY
= 5V
= 5.0V
0.5
100
vs. OUTPUT POWER
= 1/(2πR
-3dB
OUTPUT POWER (W)
SLAVE TO MASTER
FREQUENCY (Hz)
is well below the lowest fre-
1.0
-3dB
1k
IN
C
www.DataSheet4U.com
too high affects the
IN
1.5
10k
)
100k
2.0
15