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参数资料
| 型号： | MAX9723DEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/25页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9723 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | DirectDrive® |
| 放大器类型： | AB 类 |
| 输出类型： | 耳机，2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 60mW x 2 @ 16 欧姆 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 板类型： | 完全填充 |
| 已用 IC / 零件： | MAX9723D |
| 已供物品： | 板 |
| 相关产品： | MAX9723DETE+T-ND - IC AMP AUDIO .06W STER AB 16TQFN MAX9723DEBE+T-ND - IC AMP AUDIO .06W STER AB 16UCSP MAX9723DETE+-ND - IC AMP AUDIO .06W STER AB 16TQFN |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9723DEVKIT+ | 功能描述:放大器 IC 开发工具 MAX9723A/B/C/D Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9724AEBC+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.045W CLS-AB 12UCSP - Rail/Tube |
| MAX9724AEBC+G45 | 制造商:Maxim Integrated Products 功能描述:60MW DIRECTDRIVE STEREO HEADPHONE - Tape and Reel |
| MAX9724AEBC+T | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.045W CLS-AB 12UCSP - Tape and Reel |
| MAX9724AEBC+TG45 | 功能描述:音频放大器 60mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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