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参数资料
| 型号： | MAX4366ETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR .33W MONO 8TDFN |
| 标准包装： | 2,500 |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 330mW x 1 @ 16 欧姆 |
| 电源电压： | 2.3 V ~ 5.5 V |
| 特点： | 消除爆音，关机，热保护 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX4366/MAX4367/MAX4368
Choose RIN according to the Gain-Setting Resistors
section. 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 system.
Other considerations when designing the input filter
include the constraints of the overall system, the actual
frequency band of interest and click-and-pop suppres-
sion. 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 concentrate 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 consideration, 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.
BIAS Capacitor
The BIAS bypass capacitor, CBIAS improves power-
supply rejection ratio and THD+N by reducing power-
supply noise at the common-mode bias node, and
serves as the primary click-and-pop suppression
mechanism. CBIAS is fed from an internal 25kΩ source,
and controls the rate at which the common-mode bias
voltage rises at startup and falls during shutdown. For
optimum click-and-pop suppression, ensure that the
input capacitor (CIN) is fully charged (ten time con-
stants) before CBIAS. The value of CBIAS for best click-
and-pop suppression is given by:
In addition, a larger CBIAS value yields higher PSRR,
especially in single-ended applications.
Output-Coupling Capacitor
The MAX4366/MAX4367/MAX4368 require output-cou-
pling capacitors only when configured as a single-
ended amplifier. The output capacitor blocks the DC
component of the amplifier output, preventing DC cur-
rent flowing to the load. The output capacitor and the
load impedance form a highpass filter with the -3dB
point determined by:
As with the input capacitor, choose the output capacitor
(COUT) such that f-3dB is well below the lowest frequen-
cy of interest. Setting f-3dB too high affects the low-
frequency response of the system.
In addition to click-and-pop suppression and frequency
band considerations, the load impedance is another
concern when choosing COUT. Load impedance can
vary, changing the -3dB point of the output filter. A
lower impedance increases the corner frequency,
degrading low-frequency response. Select COUT such
that the worst-case load/COUT combination yields an
adequate response.
Clickless/Popless Operation
Proper selection of AC-coupling capacitors and CBIAS
achieves clickless/popless shutdown and startup. The
value of CBIAS determines the rate at which the mid-rail
bias voltage rises on startup and falls when entering
shutdown. The size of the input capacitor also affects
clickless/popless operation. On startup, CIN is charged
to its quiescent DC voltage through the feedback resis-
tor (RF) from the output. This current creates a voltage
transient at the amplifier’s output, which can result in an
audible pop. Minimizing the size of CIN reduces this
effect, improving click-and-pop suppression.
Supply Bypassing
Proper supply bypassing ensures low-noise, low-distor-
tion performance. Place a 0.1F ceramic capacitor in par-
allel with a 10F capacitor from VCC to GND. Locate the
bypass capacitors as close to the device as possible.
Headphone Applications
The MAX4366/MAX4368 can drive a mono headphone
when configured as a single-ended amplifier. Typical 2-
wire headphone plugs consist of a tip and sleeve. The tip
is the signal carrier while the sleeve is the ground con-
nection (Figure 5). Figure 6 shows the device configured
to drive headphones. OUT+ is connected to the tip,
delivering the signal to the headphone, while OUT-
remains unconnected.
f
RC
dB
L OUT
-3
1
2
=
π
C
CR
k
BIAS
IN IN
≤
Ω
10
25
330mW, Ultra-Small, Audio Power Amplifiers
with Shutdown
12
______________________________________________________________________________________
Figure 5. Typical 2-Wire Headphone Plug
TIP
(SIGNAL)
SLEEVE
(GND)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4366EUA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4366EUA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4366EVKIT | 制造商:Maxim Integrated Products 功能描述: |
| MAX4367EBL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4367EBL-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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