MAX9724A(2007) 查看數據表（PDF） - Maxim Integrated

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MAX9724A
(Rev.:2007)

60mW, DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown

Maxim Integrated 

60mW, DirectDrive, Stereo Headphone Amplifier

with Low RF Susceptibility and Shutdown

Lineout Amplifier and Filter Block

The MAX9724A can be used as an audio line driver

capable of providing 2VRMS into 10kΩ loads with a sin-

gle 5V supply (see Figure 4 for the RMS Output Voltage

vs. Supply Voltage plot). 2VRMS is a popular audio line

level, first used in CD players, but now common in DVD

and set-top box (STB) interfacing standards. A 2VRMS

RMS OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

3.5

fIN = 1kHz

3.0

RL = 10kΩ

1% THD+N

2.5

LIMITED BY

ABS. MAXIMUM

RATINGS

2.0

RL = 1kΩ

1% THD+N

1.5

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

Figure 4. RMS Output Voltage vs. Supply Voltage

sinusoidal signal equates to approximately 5.7VP-P,

which means that the audio system designer cannot

simply run the lineout stage from a (typically common)

5V supply—the resulting output swing would be inade-

quate. A common solution to this problem is to use op

amps driven from split supplies (±5V typically), or to

use a high-voltage supply rail (9V to 12V). This can

mean adding extra cost and complexity to the system

power supply to meet this output level requirement.

Having the ability to derive 2VRMS from a 5V supply, or

even 3.3V supply, can often simplify power-supply

design in some systems.

When the MAX9724A is used as a line driver to provide

outputs that feed stereo equipment (receivers, STBs,

notebooks, and desktops) with a digital-to-analog con-

verter (DAC) used as an audio input source, it is often

desirable to eliminate any high-frequency quantization

noise produced by the DAC output before it reaches

the load. This high-frequency noise can cause the input

stages of the line-in equipment to exceed slew-rate lim-

itations or create excessive EMI emissions on the

cables between devices.

15kΩ

220pF

LEFT

AUDIO 1µF

INPUT

STEREO

DAC

7.5kΩ

1.2nF

RIGHT

AUDIO 1µF

INPUT

1.2nF

7.5kΩ

7.5kΩ

7.5kΩ

MAX9724A

INL

OUTL

OUTR

INR

220pF

15kΩ

Figure 5. MAX9724A Line Out Amplifier and Filter Block Configuration

LINE IN DEVICE

10kΩ

10kΩ

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