參數(shù)資料
型號(hào)： MAX9723AETE+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 10/25頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO .06W STER AB 16TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
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(shí)最大輸出功率 x 通道數(shù)量： 60mW x 2 @ 16 歐姆
電源電壓： 1.8 V ~ 3.6 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： 16-TQFN-EP（4x4）
封裝/外殼： 16-WQFN 裸露焊盤
包裝： 帶卷 (TR)
MAX9723
Charge-Pump Capacitance and Load Resistance
graph in the Typical Operating Characteristics.
Charge-Pump Hold Capacitor
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 graph
in the Typical Operating Characteristics.
BassMax Gain-Setting Components
The bass-boost low-frequency response, when
BassMax is enabled, is set by the ratio of R1 to R2 by
the following equation (see Figure 2):
where AV_BOOST is the voltage gain boost in dB at low
frequencies. AV_BOOST is added to the gain realized by
the volume setting. The absolute gain at low frequen-
cies is equal to:
where AV_VOL is the gain due to the volume setting,
and AV_TOTAL is the absolute gain at low frequencies.
To maintain circuit stability, the ratio:
R2/(R1 + R2)
must not exceed 1/2. A ratio equaling 1/3 is recom-
mended. The switch that shorts BB_ to SGND, when
BassMax is disabled, can have an on-resistance as
high as 300
Ω. Choose a value for R1 that is greater
than 40k
Ω to ensure that positive feedback is negligible
when BassMax is disabled. Table 12 contains a list of
R2 values, with R1 = 47k
Ω, and the corresponding low-
frequency gain.
The low-frequency boost attained by the BassMax cir-
cuit is added to the gain realized by the volume setting.
Select the BassMax gain so that the output signal will
remain within the dynamic range of the MAX9723.
Output signal clipping will occur at low frequencies 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 affects the transfer function and
the volume-control gain dominates. Table 13 contains a
list of capacitor values and the corresponding poles
and zeros for a given DC gain. See Figure 11 for an
example of a gain profile using BassMax.
Custom Maximum Gain Setting Using
BassMax
The circuit in Figure 12 uses the BassMax function to
increase the maximum gain of the MAX9723. The gain
boost created with the circuit in Figure 12 is added to
the maximum gain selected by Bit 5 in the command
register. Set the maximum gain with RA and RB using
the following equation:
where AV_VOL is the gain due to the volume setting,
and AV_TOTAL is the absolute passband gain in dB.
Capacitor CA blocks any DC offset from being gained,
but allows higher frequencies to pass. CA creates a
pole that indicates the low-frequency point of the pass
band. Choose CA so that the lowest frequencies of
AA
RA RB
V TOTAL
V VOL
__
log
=+
×
+
20
f
RR
CR
R
f
RR
CR
R
POLE
ZERO
=
×× ×
=
+
×× ×
12
23
1
2
12
23
1
2
π
AA
A
V TOTAL
V VOL
V BOOST
__
_
=+
A
RR
V BOOST
_
log
=×
+
20
12
Stereo DirectDrive Headphone Amplifier
with BassMax, Volume Control, and I2C
18
______________________________________________________________________________________
GAIN PROFILE WITH AND
WITHOUT BassMax
FREQUENCY (Hz)
A
V(dB)
1k
100
10
-8
-6
-4
-2
0
2
4
6
8
10
-10
1
10k
MAX9723A
CMD REGISTER
CODE = 0xFF
R1 = 47k
Ω
R2 = 22k
Ω
C3 = 0.1
μF
fPOLE
fZERO
WITH
BassMax
WITHOUT
BassMax
Figure 11. BassMax, Gain Profile Example
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