MAX9721 datasheet(5/14 Pages) MAXIM

5 / 14 page

1V, Fixed-Gain, DirectDrive, Stereo Headphone

Amplifier with Shutdown

_______________________________________________________________________________________

010

20304050

POWER DISSIPATION

vs. OUTPUT POWER

OUTPUT POWER (mW)

VDD = 1.5V

fIN = 1kHz

POUT = POUTL + POUTR

OUTPUTS IN-PHASE

RL = 16Ω

RL = 32Ω

POWER DISSIPATION

vs. OUTPUT POWER

OUTPUT POWER (mW)

VDD = 1V

fIN = 1kHz

POUT = POUTL + POUTR

OUTPUTS IN-PHASE

RL = 16Ω

RL = 32Ω

100

10k

100k

GAIN FLATNESS

vs. FREQUENCY

FREQUENCY (Hz)

-1

-2

-3

-4

-5

-7

-6

-8

-9

-10

OUTPUT POWER vs. CHARGE-PUMP

CAPACITANCE AND LOAD RESISTANCE

LOAD RESISTANCE (Ω)

VDD = 1.5V

fIN = 1kHz

THD+N = 1%

C1 = C2 = 2.2µF

C1 = C2 = 1µF

C1 = C2 = 0.47µF

C1 = C2 = 0.68µF

-140

-120

-100

-80

-60

-40

-20

OUTPUT SPECTRUM

vs. FREQUENCY

FREQUENCY (kHz)

fIN = 1kHz

RL = 32Ω

POUT = 12mW

VDD = 1.5V

1.5

1.0

0.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0.9

1.1

1.0

1.2

1.3

1.4

1.5

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

NO LOAD

SHUTDOWN CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

1.4

1.3

1.2

1.1

1.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0.9

1.5

EXITING SHUTDOWN

MAX9721toc23

200µs/div

OUT_

1V/div

SHDN

500mV/div

POWER-UP/-DOWN WAVEFORM

MAX9721toc24

200ms/div

OUT_

10mV/div

VDD

1V/div

Typical Operating Characteristics (continued)

(VDD = 1.5V, PGND = SGND = 0V, VSHDN = 1.5V, VSS = PVSS, C1 = C2 = 1µF, CIN = 1µF, THD+N measurement bandwidth = 22Hz

to 22kHz, TA = +25°C, unless otherwise noted.) (See the Functional Diagram.)

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