programming DR is listed in Tabl" />
參數(shù)資料
型號(hào)： MAX9758ETJ+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 8/31頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO PWR 2.3W AB 32TQFN
標(biāo)準(zhǔn)包裝： 2,500
系列： DirectDrive®
類型： AB 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： 2.3W x 2 @ 3 歐姆; 130mW x 2 @ 16 歐姆
電源電壓： 4.5 V ~ 5.5 V
特點(diǎn)： 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)機(jī)，音量控制
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 32-TQFN-EP（5x5）
封裝/外殼： 32-WFQFN 裸露焊盤
包裝： 帶卷 (TR)
MAX9756/MAX9757/MAX9758
The release/attack time ratio that can be achieved by
programming DR is listed in Table 2.
Output Power Threshold
To set the threshold at which speaker output is
clamped, an external resistor must be connected from
PREF to ground. The suggested external resistor range
is from 100k
to 200k (for best results use a 1% resis-
tor). Leaving PREF unconnected disables the ALC
function. A constant current of 12A is sourced at
PREF, so that a 180k
resistor results in 1.2W clamp
limit on an 8
load and a 200k resistor results in a
1.5W clamp limit on an 8
load (Figure 6).
Use the following equation to choose the value for
RPREF for the desired maximum output power level
based on a sine wave input:
Gain Selection
The MAX9756/MAX9757/MAX9758 feature an internally
set, selectable gain. The GAIN1, GAIN2, and GAIN3
inputs set the maximum gain for the speaker and head-
phone amplifiers (Table 3). The gain of the device can
vary based upon the voltage at VOL but does not
exceed the maximum gain listed below (see the Analog
Volume (VOL) Control section).
Rk
PR
PREF
OUT
L
=
×
180
1 166
8
.
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
16
______________________________________________________________________________________
MAX9756
MAX9757
33nF
180k
VALUES SHOWN FOR AN OUTPUT POWER THRESHOLD OF 1.2W WITH AN
RL = 8
ATTACK TIME OF 495s AND A RELEASE TIME OF 990ms
DR
5V
VDD
CT
PREF
Figure 5. Recommended Output Power Threshold, Attack, and
Release Time Components
OUTPUT POWER THRESHOLD
vs. RPREF
RPREF (k
)
OUTPUT
POWER
THRESHOLD
(W)
190
180
170
160
150
140
130
120
110
0.5
1.0
1.5
2.0
2.5
3.0
0
100
200
RL = 4
RL = 8
Figure 6. Output Power Threshold vs. RPREF
Table 2. Release to Attack Ratio
DR
RELEASE/ATTACK RATIO
VDD
200
VBIAS
633
GND
2000
Table 3. Maximum Gain Settings
GAIN3
GAIN2
GAIN1
SPEAKER MODE GAIN (dB)
HEADPHONE MODE GAIN (dB)
0
+15
0
1
+16.5
0
1
0
+18
+3
0
1
+19.5
+3
1
0
+21
0
1
0
1
+22.5
0
1
0
+24
+3
1
+25.5
+3
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