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| 型号： | MAX4410EUD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .08W STER 14TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | DirectDrive® |
| 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： | 80mW x 2 @ 16 欧姆 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 特点： | 消除爆音，短路保护和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 14-TSSOP |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
MAX4410
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
______________________________________________________________________________________
15
Powering Other Circuits from a
Negative Supply
An additional benefit of the MAX4410 is the internally
generated, negative supply voltage (-VDD). This voltage
is used by the MAX4410 to provide the ground-refer-
enced output level. It can, however, also be used to
power other devices within a design. Current draw from
this negative supply (PVSS) should be limited to 5mA,
exceeding this will affect the operation of the head-
phone driver. The negative supply voltage appears on
the PVSS pin. A typical application is a negative supply
to adjust the contrast of LCD modules.
When considering the use of PVSS in this manner, note
that the charge-pump voltage at PVSS is roughly pro-
portional to -VDD and is not a regulated voltage. The
charge-pump output impedance plot appears in the
Typical Operating Characteristics.
Component Selection
Gain-Setting Resistors
External feedback components set the gain of the
MAX4410. Resistors RF and RIN (see Typical Application
Circuit) set the gain of each amplifier as follows:
To minimize VOS, set RF equal to 10k
. Values other
than 10k
increase VOS due to the input bias current,
which in turn increases the amount of DC current flow
to the speaker.
Compensation Capacitor
The stability of the MAX4410 is affected by the value of
the feedback resistor (RF). The combination of RF and
the input and parasitic trace capacitance introduces an
additional pole. Adding a capacitor in parallel with RF
compensates for this pole. Under typical conditions
with proper layout, the device is stable without the
additional capacitor.
Input Filtering
The input capacitor (CIN), in conjunction with RIN, forms a
highpass filter that removes the DC bias from an incom-
ing signal (see Typical Application Circuit). The AC-cou-
pling capacitor allows the amplifier to bias the signal to
an optimum DC level. Assuming zero-source impedance,
the -3dB point of the highpass filter is given by:
Choose RIN according to the Gain-Setting Resistors sec-
tion. Choose the CIN such that f-3dB is well below the
lowest frequency of interest. Setting f-3dB too high affects
the low-frequency response of the amplifier. Use capaci-
tors whose dielectrics have low-voltage coefficients,
such as tantalum or aluminum electrolytic. Capacitors
with high-voltage coefficients, such as ceramics, may
result in increased distortion at low frequencies.
Other considerations when designing the input filter
include the constraints of the overall system and the
actual frequency band of interest. Although high-fidelity
audio calls for a flat-gain response between 20Hz and
20kHz, portable voice-reproduction devices such as
cellular phones and two-way radios need only concen-
trate on the frequency range of the spoken human voice
(typically 300Hz to 3.5kHz). In addition, speakers used
in portable devices typically have a poor response
below 150Hz. Taking these two factors into considera-
tion, the input filter may not need to be designed for a
20Hz to 20kHz response, saving both board space and
cost due to the use of smaller capacitors.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100m
for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric. Table 1
lists suggested manufacturers.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability
to provide sufficient current drive, which leads to a loss
of output voltage. Increasing the value of C1 improves
load regulation and reduces the charge-pump output
resistance to an extent. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance
graph in the Typical Operating Characteristics. Above
2.2F, the on-resistance of the switches and the ESR of
C1 and C2 dominate.
f
RC
dB
IN IN
=
3
1
2
π
AV =
R
F
IN
Table 1. Suggested Capacitor Manufacturers
SUPPLIER
PHONE
FAX
WEBSITE
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
847-803-6100
847-390-4405
www.component.tdk.com
Note: Please indicate you are using the MAX4410 when contacting these component suppliers.
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| MAX4410EVKIT | 功能描述:音频 IC 开发工具 MAX4410 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 |
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