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参数资料
| 型号： | MAX9892EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX0902 |
| 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： | MAX9892 |
| 主要属性： | 点弹消除器 |
| 次要属性： | 包括板载 MAX4338 耳机放大器 |
| 已供物品： | 板 |
Detailed Description
The MAX9892 is the second-generation click-and-pop
eliminator designed to be used with conventional head-
phone amplifiers. The MAX9892 works by adding a low-
impedance current path from the headphone side of
the DC-blocking capacitor to ground. Drive MUTE low
when turning off the amplifier, and high when enabling
the amplifier. A short turn-on time allows the switches in
the MAX9892 to close before the DC-blocking capaci-
tors have significantly discharged, eliminating clicks
and pops at amplifier turn-off. An adjustable turn-off
time allows the delay to be set to mask all clicks and
pops during amplifier turn-on.
Setting the Turn-Off Time
The MAX9892 features a SET input that allows the turn-
off time to be adjusted from 1ms to 1000ms to match
the click-and-pop profile of the amplifier startup. The
value of an external capacitor sets the switch open
delay, as shown in the following equation:
tON (ms) = 0.02 x CSET (pF)
When the headphone amplifier is enabled, the
MAX9892 automatically waits the set delay time before
opening the analog switches. This allows amplifier turn-
on click and pop to be eliminated.
Applications Information
Setting the Supply Voltage
The MAX9892 operates from 1.7V to 3.6V supply volt-
age. The inputs, INL and INR, accept voltage swings
from VDD to VDD - 5.5V. The audio signal applied to a
headphone is ground biased, meaning that the signal
swings just as much negative as positive. Since the
MAX9892 input voltage is limited to VDD - 5.5V on the
negative side, the voltage on VDD must be set properly
to pass the audio signal when the switch is open
(Figure 2).
A voltage-divider can be used to scale down an avail-
able supply voltage as shown in Figure 3. The voltage-
divider allows the creation of a supply voltage for the
MAX9892 that is low enough to allow the negative por-
tion of the audio signal to pass. When using large resis-
tances for the voltage-divider, the supply current
affects what resistors to use. Select R2 between 10kΩ
to 1M
Ω for a given supply voltage. Use the following
equation to calculate the R1:
where VAMP is the supply voltage of the amplifier, and
I2 is the current through R2. For a signal of ±2V in refer-
ence to GND, the MAX9892 supply can be set from 2V
to 3.5V.
Selecting Series Resistors
A series resistor (RSERIES), as shown in the Typical
Operating Circuit, is necessary to achieve optimal click-
and-pop reduction. See the Click and Pop vs. RSERIES
graph in the
Typical Operating Characteristics for
details on how much click-and-pop reduction to expect
for a given series resistor.
Layout Considerations
Bypass VDD to GND with a 0.1F capacitor. The 0.1F
bypass capacitor should be positioned as close as
possible to VDD. Minimize trace length from GND to
solid system ground plane to ensure optimum perfor-
mance.
Refer to the MAX9892 Evaluation Kit for a proven PCB
layout.
R
VV
II
AMP
DD
1
2
=
+
()
MAX9892
Shunt Mode Audio Click-and-Pop Eliminator
_______________________________________________________________________________________
5
IN_
VDD - 5.5V
GND
VDD
IN_
GND
VDD
A
B
VDD - 5.5V
Figure 2. Proper Supply Selected for a Given Input Signal.
A: Supply Voltage with a Large Signal;
B: Supply Voltage with a Small Signal
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9892EVKIT+ | 功能描述:音频 IC 开发工具 MAX9892 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 |
| MAX9895AETL+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX989EKA | 制造商:Maxim Integrated Products 功能描述:DUAL/QUAD MICROPOWER LOW-VOLTAGE - Cut Tape Product |
| MAX989EKA+ | 制造商:Maxim Integrated Products 功能描述:COMPARATOR DUAL R-R I/O 2.75V/5.5V 8PIN SOT-23 - Rail/Tube |
| MAX989EKA+T | 功能描述:校验器 IC Dual uPower Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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