MAX9700AEUB Maxim Integrated, MAX9700AEUB Datasheet - Page 13
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MAX9700AEUB
Manufacturer Part Number
MAX9700AEUB
Description
Audio Amplifiers
Manufacturer
Maxim Integrated
Datasheet
1.MAX9700BEUB-T.pdf
(20 pages)
Specifications of MAX9700AEUB
Product
Class-D
Output Type
1-Channel Mono
Output Power
1.6 W x 1 at 6 Ohms
Thd Plus Noise
0.01 % at 8 Ohms at 125 mW
Operating Supply Voltage
3 V, 5 V
Maximum Power Dissipation
444.4 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
uSOP
Audio Load Resistance
16 Ohms
Available Set Gain
6 dB
Common Mode Rejection Ratio (min)
72 dB (Typ)
Input Signal Type
Differential
Minimum Operating Temperature
- 40 C
Output Signal Type
Differential
Supply Type
Single
Supply Voltage - Max
5.5 V
Supply Voltage - Min
2.5 V
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX9700AEUB
Manufacturer:
MAXIM/美信
Quantity:
20 000
Company:
Part Number:
MAX9700AEUB+
Manufacturer:
MELEXIS
Quantity:
3 200
Part Number:
MAX9700AEUB+
Manufacturer:
MAXIM/美信
Quantity:
20 000
Figure 7. Master-Slave Stereo Configuration
Figure 8. Master-Slave THD+N
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
DD
V
f = 1kHz
R
SLAVE DEVICE
DD
L
______________________________________________________________________________________
= 8Ω
= 3.3V
0.1
V
IN+
IN-
V
IN+
IN-
DD
DD
vs. OUTPUT POWER
OUTPUT POWER (W)
0.2
MAX9700
MAX9700
0.3
SYNC
SYNC
PV
OUT+
PV
OUT+
OUT-
OUT-
DD
DD
0.4
0.5
1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
Two MAX9700s can be configured as a stereo amplifier
(Figure 7). Device U1 is the master amplifier; its unfil-
tered output drives the SYNC input of the slave device
(U2), synchronizing the switching frequencies of the two
devices. Synchronizing two MAX9700s 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.
The MAX9700 can easily be driven by single-ended
sources (Figure 6), but extra care is needed if the
source impedance “seen” by each differential input is
unbalanced, such as the case in Figure 10a, where the
MAX9700 is used with an audio taper potentiometer
acting as a volume control. Functionally, this configura-
tion works well, but can suffer from click-pop transients
at power-up (or coming out of SHDN) depending on the
volume-control setting. As shown, the click-pop perfor-
mance is fine for either max or min volume, but worsens
at other settings.
Figure 9. Master-Slave Crosstalk
-100
-120
-20
-40
-60
-80
0
10
Designing with Volume Control
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)
Stereo Configuration
1k
10k
100k
13