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參數(shù)資料
| 型號： | MAX4411BEBE-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown |
| 中文描述： | 0.08 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA16 |
| 封裝： | 2 X 2 MM, 0.60 MM HEIGHT, MICRO, CSP-16 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 623K |
| 代理商： | MAX4411BEBE-T |
M
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
_______________________________________________________________________________________
9
Detailed Description
The MAX4411 fixed-gain, stereo headphone driver fea-
tures Maxim
’
s patented DirectDrive architecture, elimi-
nating the large output-coupling capacitors required by
conventional single-supply headphone drivers. The
device consists of two 80mW Class AB headphone dri-
vers, internal feedback network, undervoltage lockout
(UVLO)/shutdown control, charge pump, and compre-
hensive click-and-pop suppression circuitry (see
Typical
Application Circuit
). The charge pump inverts the posi-
tive supply (PV
DD
), creating a negative supply (PV
SS
).
The headphone drivers operate from these bipolar sup-
plies 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 dri-
ver outputs do not have a DC component typically
V
DD
/2. The large DC-blocking capacitors required with
conventional 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 1μF 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 patented DirectDrive architecture uses a
charge pump to create an internal negative supply volt-
age. 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 (220μF, 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
load, results in less than 23μA 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
+V
DD
-V
DD
GND
V
OUT
CONVENTIONAL DRIVER-BIASING SCHEME
DirectDrive BIASING SCHEME
V
DD
/2
V
DD
GND
V
OUT
Figure 1. Conventional Driver Output Waveform vs. MAX4411
Output Waveform
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