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參數(shù)資料
| 型號： | MAX9726BETP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .124W STER 20TQFN |
| 標準包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類型： | AB 類 |
| 輸出類型： | 耳機，2-通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 124mW x 2 @ 16 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點： | 低音增強模式，消除爆音，I²C，靜音，短路和熱保護，關(guān)機，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) |
MAX9726
Charge-Pump Hold Capacitor (C2)
The hold capacitor’s value and ESR directly affect the
ripple at PVSS. Ripple is reduced by increasing the
value of the hold capacitor. Choosing a capacitor with
lower ESR reduces ripple and output impedance.
Lower capacitance values can be used in systems with
low maximum output power levels. See the Output
Power vs. Charge-Pump Capacitance and Load
Resistance graphs in the
Typical Operating
Characteristics. C2 should be greater than or equal to
the value of C1.
Input-Coupling Capacitor
The AC-coupling capacitor (CIN) and input resistor
(RIN) form a highpass filter that removes any DC bias
from an input signal. See the
Functional Diagram/
Typical Operating Circuit. CIN prevents any DC compo-
nents from the input signal source from appearing in
the amplifier outputs. The -3dB point of the highpass fil-
ter, assuming zero-source impedance due to the input
signal source, is given by:
Choose CIN such that f-3dB is well below the lowest fre-
quency of interest. Setting f-3dB too high affects the
amplifier’s low-frequency response. Use capacitors with
low-voltage coefficient dielectrics. Aluminum electrolytic,
tantalum, or film dielectric capacitors are good choices
for AC-coupling capacitors. Capacitors with high-voltage
coefficients, such as ceramics (non-C0G dielectrics),
can result in increased distortion at low frequencies.
Gain-Setting Components
With BassMax disabled, the maximum gain of the
MAX9726 is set by the values of the external resistors
RIN and RF (see the Functional Diagram/Typical
Operating Circuit). When BassMax is disabled, the
maximum gain of the MAX9726 is:
where AV is the maximum voltage gain in dB. The over-
all voltage gain of the MAX9726 with BassMax disabled
is equal to:
where ATTENdB_VOL is the attenuation due to the vol-
ume setting in dB and ATOTAL is the overall voltage
gain of the MAX9726 in dB.
When BassMax is enabled, the bass-boost low-fre-
quency response is set by the ratio of R1 to R2, by the
following equation (see Figure 2):
where ABOOST is the voltage gain boost at low frequen-
cies in dB. ABOOST is added to the gain realized by the
volume setting and the gain set by resistors RIN and RF
(AV). The overall voltage gain of the MAX9726 at low
frequencies with BassMax enabled is equal to:
where ATOTAL_BB is the overall gain of the MAX9726 at
low frequencies in dB.
To maintain circuit stability, the ratio
must not exceed one-half. A ratio equal to or
less than one-third is recommended. The switch that
shorts BM_ to SGND, when BassMax is disabled, can
have an on-resistance as high as 300Ω. Choose a
value for R1 that is greater than 40kΩ to ensure that
positive feedback is negligible when BassMax is dis-
abled. Table 7 contains a list of R2 values, with R1 =
47kΩ, and the corresponding low-frequency gain
boost.
A
ATTEN
dB
TOTAL BB
V
BOOST
dB VOL
__
()
=+
A
RR
dB
BOOST =×
+
20
12
log
(
)
A
ATTEN
dB
TOTAL
V
dB VOL
=
_
()
A
R
dB
V
F
IN
=×
20 log
(
)
f
RC
Hz
dB
IN
=
××
3
1
2
π
()
DirectDrive, Headphone Amplifier with
BassMax, I2C, Volume and Gain Control
18
______________________________________________________________________________________
Table 7. BassMax Gain Examples
(R1 = 47kΩ)
R2 (k
Ω)
LOW-FREQUENCY GAIN BOOST (dB)
39
20.6
33
15.1
27
11.3
22
8.8
15
5.7
10
3.7
R
RR
2
12
+
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