Application Note
13 of 28
V 1.0
2019-04-28
User manual for MA120xxx reference boards
Measurement results
3
Measurement results
This section shows the measurement results from tests performed on a reference board, which demonstrate
high audio and efficiency performance and good thermal characteristics.
Measurements include:
Frequency sweep
Output power sweep
Output spectrum
Power consumption and efficiency
EMI
All measurement results were obtained using the following settings:
Device: MA12070
Two-channel BTL configuration
Load: 4
Ω
+ 22
μ
H series inductance
PVDD: 18 V
Gain setting: 20 dB
PMP: default PMP0
Measurements carried out with APx 515 + AUX-0025 input filter
APx uses AES17 brick-wall filter (20 kHz)
3.1
Frequency sweep
Frequency sweeps were carried out with both channels at 1 W output power. To improve the gain drop at 20 Hz,
use larger input capacitors.
Figure 7
Gain vs. frequency
0
5
10
15
20
25
30
35
40
10
100
1000
10000
Gai
n
[
d
B
]
Frequency [Hz]
Channel 1
Channel 2