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| 型號(hào)： | MAX4411EVKIT |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX4411 |
| 標(biāo)準(zhǔn)包裝： | 1 |
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MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
_______________________________________________________________________________________
9
Detailed Description
The MAX4411 fixed-gain, stereo headphone driver fea-
tures Maxim’s DirectDrive architecture, eliminating the
large output-coupling capacitors required by conven-
tional single-supply headphone drivers. The device con-
sists of two 80mW Class AB headphone drivers, internal
feedback network, undervoltage lockout (UVLO)/shut-
down control, charge pump, and comprehensive click-
and-pop suppression circuitry (see Typical Application
Circuit). The charge pump inverts the positive supply
(PVDD), creating a negative supply (PVSS). The head-
phone drivers operate from these bipolar supplies with
their outputs biased about GND (Figure 1). The drivers
have almost twice the supply range compared to other
3V single-supply drivers, increasing the available output
power. The benefit of this GND bias is that the driver out-
puts do not have a DC component typically VDD/2. The
large DC-blocking capacitors required with convention-
al headphone drivers are unnecessary, thus conserving
board space, system cost, and improving frequency
response.
Each channel has independent left/right, active-low
shutdown controls, optimizing power savings in mixed-
mode, mono/stereo operation. The device features an
undervoltage lockout that prevents operation from an
insufficient power supply and click-and-pop suppres-
sion that eliminates audible transients on startup and
shutdown. Additionally, the MAX4411 features thermal-
overload and short-circuit protection and can withstand
±8kV ESD strikes on the output pins.
Fixed Gain
The MAX4411 utilizes an internally fixed gain configura-
tion of either -1.5V/V (MAX4411) or -2V/V (MAX4411B).
All gain-setting resistors are integrated into the device,
reducing external component count. The internally set
gain, in combination with DirectDrive, results in a head-
phone amplifier that requires only five tiny 1F capaci-
tors to complete the amplifier circuit: two for the charge
pump, two for audio input coupling, and one for power-
supply bypassing (see Typical Application Circuit).
DirectDrive
Conventional single-supply headphone drivers have their
outputs biased about a nominal DC voltage (typically half
the supply) for maximum dynamic range. Large coupling
capacitors are needed to block this DC bias from the
headphone. Without these capacitors, a significant
amount of DC current flows to the headphone, resulting
in unnecessary power dissipation and possible damage
to both headphone and headphone driver.
Maxim’s DirectDrive architecture uses a charge pump
to create an internal negative supply voltage.
This allows the MAX4411 outputs to be biased about
GND, almost doubling dynamic range while operating
from a single supply. With no DC component, there is
no need for the large DC-blocking capacitors. Instead
of two large (220F, typ) tantalum capacitors, the
MAX4411 charge pump requires two small ceramic
capacitors, conserving board space, reducing cost,
and improving the frequency response of the head-
phone driver. See the Output Power vs. Charge-Pump
Capacitance and Load Resistance graph in the Typical
Operating Characteristics for details of the possible
capacitor sizes. There is a low DC voltage on the driver
outputs due to amplifier offset. However, the offset of
the MAX4411 is typically 0.7mV, which, when com-
bined with a 32
Ω load, results in less than 23A of DC
current flow to the headphones.
Previous attempts to eliminate the output-coupling capac-
itors involved biasing the headphone return (sleeve) to
the DC-bias voltage of the headphone amplifiers. This
+VDD
-VDD
GND
VOUT
CONVENTIONAL DRIVER-BIASING SCHEME
DirectDrive BIASING SCHEME
VDD/2
VDD
GND
VOUT
Figure 1. Conventional Driver Output Waveform vs. MAX4411
Output Waveform
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| MAX4412ESA+ | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low-Cost Low-Power Ultra-Small 3V/5V 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4412ESA+T | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single Low-Cost low-Power Ultra-Small 3V/5V 500MHz Single-Supply OP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4412EUK | 制造商:Maxim Integrated Products 功能描述:SINGLE, LOW-COST, LOW-POWER, ULTRA-SMALL, 3V/ - Cut Tape Product |
| MAX4412EUK+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL VOLT FDBK R-R O/P 5.5V 5PIN SOT-23 - Bulk |
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