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參數(shù)資料
| 型號： | MAX97200BEWC+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUD HDPHN 45MW H DL 12WLP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 系列： | DirectDrive® |
| 類型： | H 類 |
| 輸出類型： | 耳機，2-通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 45mW x 2 @ 16 歐姆 |
| 電源電壓： | 1.62 V ~ 1.98 V |
| 特點： | 消除爆音；關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應商設(shè)備封裝： | 12-WLP |
| 封裝/外殼： | 12-WFBGA，WLCSP |
| 包裝： | 標準包裝 |
| 其它名稱： | MAX97200BEWC+TDKR |
Low-Power, Low-Offset, Dual Mode, Class H
DirectDrive Headphone Amplifier
MAX97200
9
Dual Mode Charge Pump
The MAX97200’s Dual Mode, charge pump outputs
either QPVIN/2 in high-efficiency mode or QPVIN in high-
power mode, resulting in a power-supply differential of
1.8V or 3.6V. The charge-pump mode changes based
on the level of the output signal needed. When the
output voltage is small, the voltage rails are reduced to
minimize power consumption. When the output voltage
is large, the voltage rails are increased to accommodate
the larger output need.
High-power mode is similar to Maxim’s traditional
DirectDrive architecture and is best suited for loads
that require high voltage swing. High-efficiency mode
improves power consumption by reducing the power-
supply voltage across the amplifier’s output stage by
half. The reduced power-supply voltage is good for idle
conditions or low-signal level conditions into a head-
phone.
Class H Operation
The MAX97200’s internal Class H amplifier uses a class
AB output stage with multiple, discrete power supplies.
This result’s in two power-supply differentials of 1.8V and
3.6V generated from a single 1.8V external supply. The
PVIN/2 power-supply differential is used when the output
voltage requirements are low, and the output is below
VTH2 as seen in Figure 2. The higher supply differential
is used when the output voltage exceeds the high
threshold VTH2, maximizing output power and voltage
swing. The transition time from high-efficiency mode to
high-power mode occurs when the threshold is crossed.
The switch from high-power mode to high-efficiency
mode occurs 32ms (typ) after the threshold is crossed.
Built-in hysteresis keeps the charge pump from erratic
mode switching when the output voltage is near the high
and low thresholds.
Click-and-Pop Suppression
In conventional single-supply audio amplifiers, the out-
put-coupling capacitor contributes significantly to audi-
ble clicks and pops. Upon startup, the amplifier charges
the coupling capacitor to its bias voltage, typically half
the supply. Likewise, on shutdown, the capacitor is dis-
charged. This results in a DC shift across the capacitor,
which appears as an audible transient at the speaker.
Since the MAX97200 does not require output coupling
capacitors, this problem does not arise. Additionally,
the MAX97200 features extensive click-and-pop sup-
pression that eliminates any audible transient sources
internal to the device.
Typically, the output of the device driving the MAX97200
has a DC bias of half the supply voltage. At startup, the
input-coupling capacitor, CIN, is charged to the pream-
plifier’s DC bias voltage through the MAX97200 input
resistor, RIN. This DC shift across the capacitor results
in an audible click-and-pop. The MAX97200 precharges
the input capacitors when power is applied to ensure
that no audible clicks or pops are heard when SHDN is
pulled high.
Shutdown
The MAX97200 features a 1FA, low-power shutdown
mode that reduces quiescent current consumption and
extends battery life. Shutdown is controlled by the SHDN
input. Driving the SHDN input low disables the drive
amplifiers and charge pump and sets the headphone
amplifier output resistance to 100I.
Applications Information
Component Selection
Input-Coupling Capacitor
The input capacitor (CIN), in conjunction with the ampli-
fier input resistance (RIN_), forms a highpass filter that
removes the DC bias from the incoming signal. The
AC-coupling capacitor allows the amplifier to bias the sig-
nal to an optimum DC level. Assuming zero source imped-
ance, the -3dB point of the highpass filter is given by:
3dB
IN IN
1
f-
2R C
=
π
Figure 2. Inverting and Split Mode Transitions
10ms/div
VPVDD
VPVSS
IN_
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9720AEBE | 制造商:Maxim Integrated Products 功能描述:50MW, DIRECTDRIVE, STEREO HEADPHONE AMPLIFIER - Rail/Tube |
| MAX9720AEBE+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.05W CLS-AB 16UCSP - Rail/Tube |
| MAX9720AEBE+T | 功能描述:音頻放大器 50mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9720AEBE-T | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9720AEUE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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