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參數(shù)資料
| 型號： | MAX9753ETI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 8/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 2.2W D 28TQFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類型： | D 類 |
| 輸出類型： | 2-通道（立體聲）帶立體聲耳機(jī) |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 2.2W x 2 @ 4 歐姆; 62mW x 2 @ 16 歐姆 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，輸入多路復(fù)用器，短路和熱保護(hù)，關(guān)機(jī) |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（5x5） |
| 封裝/外殼： | 28-WFQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
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MAX9752/MAX9753/MAX9754
Table 2 shows the amplifier gain settings needed to
attain maximum speaker output power from a given
input voltage and load.
MAX9753/MAX9754
The gain of the MAX9753/MAX9754 is set by GAIN.
Drive GAIN high to set the gain of the speaker ampli-
fiers to 9dB, and the gain of the headphone amplifiers
to 0dB. Drive GAIN low to set the gain of the speaker
amplifiers to 10.5dB, and the gain of the headphone
amplifiers to 3dB (Table 3).
Table 4 shows the amplifier input voltage needed to
attain maximum speaker output power from a given
gain setting and load.
Analog Volume Control (VOL, MAX9752)
The MAX9752 features an analog volume control that
varies the speaker and headphone amplifier’s gain in 31
discrete steps based upon the DC voltage applied to
VOL. The input range of VOL is from 0 (full volume) to
0.858 x HPVDD (full mute). Example step sizes are shown
in Table 5. Control VOL with either a DAC or potentiome-
ter as shown in Figure 9. Because the VOL input is high
impedance (typically 100M
Ω), it can also be driven with
an RC-filtered PWM signal. Connect the reference of the
DAC or potentiometer to HPVDD. Since the volume con-
trol is ratiometric to HPVDD, any changes in HPVDD are
negated. The gain step sizes are not constant, the step
sizes at the upper extreme are 0.5dB/step, 2.0dB/step in
the midrange, and 4.0dB/step at the lower extreme.
Figure 10 shows the transfer function of the volume con-
trol for HPVDD = 3.3V.
2.2W, Low-EMI, Stereo, Class D Power Amplifiers
with DirectDrive Headphone Amplifiers
16
______________________________________________________________________________________
Table 2. MAX9752 Speaker Amplifier Gain
Settings for Maximum Output Power
GAIN
(dB)
INPUT
(VRMS)
RL
(
Ω)
POUT
(W)
MAX9752A
9.0
1.004
4
2.0
10.5
0.844
4
2.0
12.0
0.710
4
2.0
13.5
0.598
4
2.0
9.0
1.099
8
1.2
10.5
0.925
8
1.2
12.0
0.778
8
1.2
13.5
0.655
8
1.2
MAX9752B
15.0
0.503
4
2.0
16.5
0.423
4
2.0
18.0
0.356
4
2.0
19.5
0.300
4
2.0
15.0
0.551
8
1.2
16.5
0.464
8
1.2
18.0
0.390
8
1.2
19.5
0.328
8
1.2
MAX9752C
6.0
1.418
4
2.0
7.5
1.193
4
2.0
9.0
1.004
4
2.0
10.5
0.844
4
2.0
6.0
1.553
8
1.2
7.5
1.307
8
1.2
9.0
1.099
8
1.2
10.5
0.925
8
1.2
Table 3. MAX9753/MAX9754 Maximum
Gain Settings
GAIN
SPEAKER MODE
GAIN (dB)
HEADPHONE MODE
GAIN (dB)
0
10.5
3
1
9.0
0
Table 4. MAX9753/MAX9754 Input Voltage
and Gain Settings for Maximum Output
Power
GAIN
(dB)
INPUT
(VRMS)
RL
(
Ω)
POUT
(W)
10.5
0.844
4
2.0
9.0
1.004
4
2.0
10.5
0.925
8
1.2
9.0
1.099
8
1.2
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