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参数资料
| 型号： | MAX9890EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9890 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 音频，音频处理 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MAX9890 |
| 主要属性： | 点弹消除器 |
| 次要属性： | 2.7 V ~ 5.5 V 电源 |
| 已供物品： | 板 |
Audio Click-Pop Suppressor
8
Maxim Integrated
MAX9890
ness (on-resistance flatness is defined as the difference
between the maximum and minimum values of on-resis-
tance measured over the specific analog-signal range).
Power-Supply Rejection Ratio (PSRR)
PSRR is the measurement of AC power-supply ripple or
noise that couples to the output. Variations in supply volt-
age corrupt the audio signal, due to changes in the RON
value by supply modulation. The FFT shown in Figure 5
was taken with a 19kHz 1VP-P sine wave onto the 5V DC
supply voltage, and a 20kHz 1VP-P sine wave applied at
IN_ with a 32
Ω load is shown in Figure 6. The MAX9890
maintains a -100dB (typ) PSRR across the supply voltage
range eliminating any corruption of the audio signal from
supply variations. Therefore, with a zero audio signal, the
RON variation due to supply voltage ripple does not con-
tribute to any output signal modulation.
Low-Frequency Response
In addition to the cost and size disadvantages of the
output-coupling capacitors, these capacitors limit the
amplifier’s low-frequency response and can distort the
audio signal.
The impedance of a headphone or speaker load and
the output-coupling capacitor form a highpass filter with
the -3dB point set by:
where RL is the headphone impedance and COUT is
the output-coupling capacitor value. The highpass filter
is required by conventional single-ended, single power-
supply headphone drivers to block the midrail DC bias
component of the audio signal from the headphones.
The drawback to the filter is that it can attenuate low-
frequency signals. Larger values of COUT reduce this
effect but result in physically larger, more expensive
capacitors. Figure 7 shows the relationship between the
size of COUT and the resulting low-frequency attenua-
tion. Note that the -3dB point for a 16
Ω headphone with
a 100F blocking capacitor is 100Hz, well within the
normal audio band, resulting in low-frequency attenua-
tion of the reproduced signal.
The MAX9890A and MAX9890B have different turn-on
times to accommodate different size output-coupling
capacitors (see Table 1). Using a capacitor smaller
than the specified maximum allowed does not degrade
click-pop suppression. Therefore, capacitors less than
100F can be used with the A or B version devices.
f
RC
dB
L OUT
=
3
1
2
π
THD
R
MAXIMUM
FLAT ON
LOAD
=×
()
%
4
100
-140
-70
-80
-90
-100
-110
-120
-130
-50
-60
-30
-40
-20
0
-10
10
15
17
19
21
23
25
VCC = 4.5V TO 5.5V, fVCC = 19kHz,
RL = 32
Ω, VIN = 1VP-P, fIN = 20kHz
FREQUENCY (kHz)
OUTPUT
SPECTRUM
(dBV)
Figure 5. FFT for PSRR
RAMP
UP
VDC = 5V
VAC = 1VP-P
19kHz
VDC = 2.0V
VAC = 1VP-P
20kHz
SHDN
MAX9890
IN_
OUT_
RL
OUT_
RAMP
DOWN
VCC
Figure 6. PSRR Test Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9890EVKIT+ | 功能描述:音频 IC 开发工具 MAX9890 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX9892ELT+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX9892ELT+T | 功能描述:音频 DSP Audio Click-Pop Suppressor RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| MAX9892ERT+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX9892ERT+T | 功能描述:音频 DSP Audio Click-Pop Suppressor RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
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