max9773etgt Maxim Integrated Products, Inc., max9773etgt Datasheet - Page 14

• Manufacturer Part Number: max9773etgt
• Description: Max9773 1.8w, Filterless, Ultra-low Emi, Stereo Class D Audio Power Amplifier
• Manufacturer: Maxim Integrated Products, Inc.

1.8W, Filterless, Ultra-Low EMI,
Stereo Class D Audio Power Amplifier
Table 2. Gain Settings (V
THD+N = 10%)
Table 3. Custom Gain Components
14
GAIN1
GAIN1
0
1
0
1
0
1
0
1
______________________________________________________________________________________
GAIN_ SETTINGS
0
0
0
0
0
0
1
1
1
1
1
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
GAIN2
0
0
1
1
0
0
1
1
GAIN2
+15.6
+15.6
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
GAIN
(dB)
+26
+20
+26
+20
12
12
0.097699
0.194936
0.323513
0.489657
0.114288
0.228035
0.378444
0.572798
(V
INPUT
GAIN (dB)
DD
RMS
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
)
= 3.3V,
(Ω)
R
4
4
4
4
8
8
8
8
L
R1 (Ω)
P
(mW)
950
950
950
950
650
650
650
650
1.5k
1.2k
2.5k
2.8k
2.8k
1.8k
5.5k
750
OUT
10k
11k
12k
14k
1k
1k
2k
2k
2k
1k
4k
5k
5k
7k
8k
8k
—
—
—
The MAX9773 features four selectable gain settings,
minimizing external component count. Gains of 12dB,
15.6dB, 20dB, and 26dB are set through gain-select
inputs, GAIN1 and GAIN2. GAIN1 and GAIN2 can be
hardwired or digitally controlled. Table 2 shows the
suggested gain settings to attain a maximum output
power from a given peak input voltage and given load
at V
The MAX9773 can be set up with any gain setting by
adding three external resistors per amplifier. Figure 6
shows the required circuit for setting up custom gain.
Table 3 displays a list of the components to use for sev-
eral gain settings.
DD
R2 (Ω)
20k
10k
30k
20k
10k
10k
40k
40k
20k
40k
40k
30k
20k
16k
16k
14k
12k
12k
10k
10k
10k
6k
6k
6k
—
—
—
= 3.3V and THD+N = 10%.
C
IN
0.86
0.68
0.68
0.86
0.86
0.68
0.68
0.68
0.68
0.68
0.68
0.68
0.68
0.58
0.47
1.5
2.2
2.2
1.2
1.2
1
1
2
1
1
1
1
(µF)
Custom Gain Settings
GAIN TOLERANCE (dB)
Selectable Gain
+0.12/-0.07
+0.14/-0.08
+0.13/-0.08
+0.19/-0.12
+0.15/-0.09
+0.12/-0.07
+0.15/-0.09
+0.06/-0.03
+0.15/-0.09
+0.14/-0.08
+0.08/-0.05
+0.15/-0.09
+0.15/-0.09
+0.15/-0.09
+0.16/-0.1
+0.1/-0.06
+0.17/-0.1
+0.17/-0.1
+0.17/-0.1
+0.16/-0.1
+0.17/-0.1
+0.16/-0.1
+0.16/-0.1
+0.17/-0.1
—
—
—