max9712eub Maxim Integrated Products, Inc., max9712eub Datasheet - Page 13

• Manufacturer Part Number: max9712eub
• Description: Max9712 500mw, Low Emi, Filterless, Class D Audio Amplifier
• Manufacturer: Maxim Integrated Products, Inc.

Figure 7. Master-Slave Stereo Configuration
Figure 8. Master-Slave THD
RIGHT-CHANNEL
LEFT-CHANNEL
DIFFERENTIAL
DIFFERENTIAL
AUDIO INPUT
AUDIO INPUT
1µF
1µF
0.001
0.01
100
0.1
10
1
TOTAL HARMONIC DISTORTION PLUS NOISE
0
V
V
f = 1kHz
R
SLAVE DEVICE
DD
DD
L
______________________________________________________________________________________
= 8Ω
= 3.3V
0.1
V
IN+
IN-
V
IN+
IN-
vs. OUTPUT POWER
DD
DD
OUTPUT POWER (W)
0.2
MAX9712
MAX9712
0.3
SYNC
SYNC
OUT+
OUT+
PV
PV
OUT-
OUT-
DD
DD
0.4
0.5
500mW, Low EMI, Filterless,
Class D Audio Amplifier
tered output drives the SYNC input of the slave device
(U2), synchronizing the switching frequencies of the two
devices. Synchronizing two MAX9712s ensures that no
beat frequencies occur within the audio spectrum. This
configuration works when the master device is in either
FFM or SSM mode. There is excellent THD+N perfor-
mance and minimal crosstalk between devices due to
the SYNC connection (Figures 8 and 9). U2 locks onto
only the frequency present at SYNC, not the pulse
width. The internal feedback loop of device U2 ensures
that the audio component of U1’s output is rejected.
For the latest application details on UCSP construction,
dimensions, tape carrier information, printed circuit
board techniques, bump-pad layout, and recommend-
ed reflow temperature profile, as well as the latest
information on reliability testing results, refer to the
Application Note: UCSP—A Wafer-Level Chip-Scale
Package available on Maxim’s website at www.maxim-
ic.com/ucsp.
TRANSISTOR COUNT: 3595
PROCESS: BiCMOS
Figure 9. Master-Slave Crosstalk
UCSP Applications Information
-100
-120
-20
-40
-60
-80
0
10
V
R
f = 1kHz
V
DD
L
IN
= 8Ω
= 500mV
= 3.3V
CROSSTALK vs. FREQUENCY
MASTER-TO-SLAVE
100
SLAVE-TO-MASTER
P-P
FREQUENCY (Hz)
Chip Information
1k
10k
100k
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