参数资料
型号: MAX9756ETX+T
厂商: Maxim Integrated Products
文件页数: 9/31页
文件大小: 0K
描述: IC AMP AUDIO PWR 2.3W AB 36TQFN
标准包装: 2,500
系列: DirectDrive®
类型: AB 类
输出类型: 2-通道(立体声)带立体声耳机
在某负载时最大输出功率 x 通道数量: 2.3W x 2 @ 3 欧姆; 130mW x 2 @ 16 欧姆
电源电压: 4.5 V ~ 5.5 V
特点: 消除爆音,短路保护和热保护,关机,音量控制
安装类型: 表面贴装
供应商设备封装: 36-TQFN 裸露焊盘(6x6)
封装/外壳: 36-WFQFN 裸露焊盘
包装: 带卷 (TR)
Analog Volume Control (VOL)
The MAX9756/MAX9757/MAX9758 feature an analog
volume control that varies the gain of the device in 31
discrete steps based upon the DC voltage applied to
VOL (see Table 4). The input range of VOL is from 0
(full volume) to HPVDD (full mute), with example step
sizes shown in Table 3. Connect the reference of the
device driving VOL (Figure 7) to HPVDD. Connect VOL
to GND (full volume) if volume control is not used.
MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
______________________________________________________________________________________
17
Table 4. Volume Levels
VVOL (V) = MULTIPLIER x
HPVDD
SPEAKER MODE
GAIN (dB)
HEADPHONE MODE
GAIN (dB)
MULTIPLIER
VVOL
(MIN)*
VVOL
(MAX)*
GAIN3 = 0
GAIN2 = 0
GAIN1 = 0
GAIN3 = 0
GAIN2 = 0
GAIN1 = 1
GAIN3 = 0
GAIN2 = 1
GAIN1 = 0
GAIN3 = 0
GAIN2 = 1
GAIN1 = 1
GAIN3 = 1
GAIN2 = 0
GAIN1 = 0
GAIN3 = 1
GAIN2 = 0
GAIN1 = 1
GAIN3 = 1
GAIN2 = 1
GAIN1 = 0
GAIN3 = 1
GAIN2 = 1
GAIN1 = 1
GAIN3 = X
GAIN2 = 0
GAIN1 = X
GAIN3 = X
GAIN2 = 1
GAIN1 = X
0.07
0.00
0.49
15
16.5
18
19.5
21
22.5
24
25.5
0
3
0.16
0.49
0.57
14
16
17.5
19
20
22
23.5
25
-1
2.5
0.18
0.57
0.64
13
15
17
18.5
19
21
23
24.5
-2
2
0.21
0.64
0.72
12
14
16.5
18
20
22.5
24
-3
1.5
0.23
0.72
0.80
10
13
16
17.5
16
19
22
23.5
-5
1
0.25
0.80
0.88
8
12
15
17
14
18
21
23
-7
0
0.28
0.88
0.95
6
10
14
16.5
12
16
20
22.5
-9
-1
0.30
0.95
1.03
4
8
13
16
10
14
19
22
-11
-2
0.32
1.03
1.11
2
6
12
15
8
12
18
21
-13
-3
0.35
1.11
1.19
0
4
10
14
6
10
16
20
-15
-5
0.37
1.19
1.26
-2
2
8
13
4
8
14
19
-17
-7
0.39
1.26
1.34
-4
0
6
12
2
6
12
18
-19
-9
0.42
1.34
1.42
-6
-2
4
10
0
4
10
16
-21
-11
0.44
1.42
1.50
-8
-4
2
8
-2
2
8
14
-23
-13
0.46
1.50
1.57
-10
-6
0
6
-4
0
6
12
-25
-15
0.49
1.57
1.65
-12
-8
-2
4
-6
-2
4
10
-27
-17
0.51
1.65
1.73
-14
-10
-4
2
-8
-4
2
8
-29
-19
0.54
1.73
1.80
-16
-12
-6
0
-10
-6
0
6
-31
-21
0.56
1.80
1.88
-18
-14
-8
-2
-12
-8
-2
4
-33
-23
0.58
1.88
1.96
-20
-16
-10
-4
-14
-10
-4
2
-35
-25
0.61
1.96
2.04
-22
-18
-12
-6
-16
-12
-6
0
-37
-27
0.63
2.04
2.11
-24
-20
-14
-8
-18
-14
-8
-2
-39
-29
0.65
2.11
2.19
-26
-22
-16
-10
-20
-16
-10
-4
-41
-31
0.68
2.19
2.27
-28
-24
-18
-12
-22
-18
-12
-6
-43
-33
0.70
2.27
2.35
-32
-26
-20
-14
-26
-20
-14
-8
-47
-35
0.72
2.35
2.42
-36
-28
-22
-16
-30
-22
-16
-10
-51
-37
0.75
2.42
2.50
-40
-32
-24
-18
-34
-26
-18
-12
-55
-39
0.77
2.50
2.58
-44
-36
-26
-20
-38
-30
-20
-14
-59
-41
0.79
2.58
2.66
-48
-40
-28
-22
-42
-34
-22
-15
-63
-43
0.82
2.66
2.73
-52
-44
-32
-24
-46
-38
-26
-18
-67
-47
0.84
2.73
2.81
-56
-48
-36
-26
-50
-42
-30
-20
-71
-51
0.93
2.81
3.30
MUTE
MAX9756
VREF
DAC
HPVDD
VOL
Figure 7. Volume Control Circuit
*Based on HPVDD = 3.3V.
X = Don’t care.
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