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參數(shù)資料
| 型號： | MAX9726BETP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO .124W STER 20TQFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類型： | AB 類 |
| 輸出類型： | 耳機(jī)，2-通道（立體聲） |
| 在某負(fù)載時最大輸出功率 x 通道數(shù)量： | 124mW x 2 @ 16 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點(diǎn)： | 低音增強(qiáng)模式，消除爆音，I²C，靜音，短路和熱保護(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： | 20-TQFN-EP（4x4） |
| 封裝/外殼： | 20-WFQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
The low-frequency boost attained by the BassMax cir-
cuit is added to the gain realized by the maximum gain
and volume settings. Select the BassMax gain so that
the output signal remains within the dynamic range of
the MAX9726. Output signal clipping occurs at low fre-
quencies if the BassMax gain boost is excessively
large. See the
Output Dynamic Range section.
Capacitor C3 forms a pole and a zero according to the
following equations:
fPOLE is the frequency at which the gain boost begins
to roll off. fZERO is the frequency at which the bass-
boost gain no longer effects the transfer function. At
frequencies greater than or equal to fZERO, the gain set
by resistors RIN and RF and the volume control attenua-
tion dominate. Table 8 contains a list of capacitor val-
ues and the corresponding poles and zeros for a given
DC gain. See Figure 8 for an example of a gain profile
using BassMax.
Single-Pole Active Lowpass Filter (LPF)
To configure the MAX9726 as an active single-pole low-
pass filter (Figure 9), connect a single feedback capac-
itor (CF) in parallel with the feedback resistor (RF). The
-3dB point (below passband) of the active lowpass filter
is equal to:
The passband gain of the active filter is determined by
the external component values described in the
Gain-
Setting Components section.
To minimize distortion, use capacitors with low-voltage
coefficient dielectrics when selecting CF. Film or C0G
dielectric capacitors are good choices for feedback
capacitors. Capacitors with high-voltage coefficients,
such as ceramics (non-C0G dielectrics), can result in
increased distortion.
f
RC
Hz
dB
FF
=
3
1
2
π
()
f
RR
CR
R
Hz
f
RR
CR
R
Hz
POLE
ZERO
=
×× ×
=
+
×× ×
12
23
1
2
12
23
1
2
π
()
MAX9726
DirectDrive, Headphone Amplifier with
BassMax, I2C, Volume and Gain Control
______________________________________________________________________________________
19
Table 8. BassMax Pole and Zero
Examples for a Gain Boost of 8.8dB
(R1 = 47kΩ, R2 = 22kΩ)
C3 (nF)
fPOLE (Hz)
fZERO (Hz)
100
38
106
82
47
130
68
56
156
56
68
190
47
81
230
22
174
490
10
384
1060
MAX9726
fig08
FREQUENCY (Hz)
GAIN
(dB)
1k
100
-8
-6
-4
-2
0
2
4
6
8
10
-10
10
10k
BassMax FREQUENCY RESPONSE
BassMax ENABLED
fZERO
fPOLE
R1 = 47k
Ω
R2 = 22k
Ω
C3 = 0.1
μF
RL = 32
Ω
BassMax DISABLED
Figure 8. BassMax Gain Profile Example
CF
RF
RIN
FB_
IN_
TO
ATTENUATOR
STAGE
f-3dB =
1
2
πRFCF
MAX9726
Figure 9. Single-Pole Active Lowpass Filter
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