MAX9721 datasheet(2/14 Pages) MAXIM

2 / 14 page

1V, Fixed-Gain, DirectDrive, Stereo Headphone

Amplifier with Shutdown

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ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

SGND to PGND .....................................................-0.3V to +0.3V

VDD to SGND or PGND ............................................-0.3V to +2V

VSS to PVSS ...........................................................-0.3V to +0.3V

C1P to PGND..............................................-0.3V to (VDD + 0.3V)

C1N to PGND............................................(PVSS - 0.3V) to +0.3V

VSS, PVSS to GND ....................................................+0.3V to -2V

OUTR, OUTL, INR, INL to SGND .....(VSS - 0.3V) to (VDD + 0.3V)

SHDN to SGND or PGND .........................................-0.3V to +4V

Output Short-Circuit Current ......................................Continuous

Continuous Power Dissipation (TA = +70°C)

12-Bump UCSP (derate 6.5mW/°C above 70°C) ......518.8mW

12-Pin Thin QFN (derate 16.9mW/°C above 70°C) .1349.1mW

Junction Temperature ......................................................+150°C

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Bump Temperature (soldering) Reflow............................+230°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VDD = 1.5V, PGND = SGND = 0V, VSHDN = 1.5V, VSS = PVSS, C1 = C2 = 1µF, CIN = 1µF, RL = ∞, TA = TMIN to TMAX, unless otherwise

noted. Typical values are at TA = +25°C.) (See the Functional Diagram.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage Range

VDD

Guaranteed by PSRR test

0.9

1.8

Quiescent Supply Current

IDD

Both channels active

2.2

TA = +25°C

1.0

Shutdown Current

ISHDN

VSHDN = 0V

TA = -40°C to +85°C

µA

Shutdown to Full Operation

tON

180

µs

VIH

VDD = 0.9V to 1.8V

0.7 x VDD

SHDN Thresholds

VIL

VDD = 0.9V to 1.8V

0.3 x VDD

SHDN Input Leakage Current

ILEAK

VDD = 0.9V to 1.8V (Note 1)

±1µA

CHARGE PUMP

Oscillator Frequency

fOSC

493

580

667

kHz

AMPLIFIERS

MAX9721A

2.04

-2.00

-1.96

MAX9721B

-1.53

-1.5

-1.47

Voltage Gain

MAX9721C

-1.02

-1.00

-0.98

V/V

Gain Match

∆AV

±0.5

MAX9721A

±0.9

±3.8

MAX9721B

±1.3

±5.7

Total Output Offset Voltage

VOS

Input AC-coupled,

RL = 32Ω to GND

MAX9721C

±1.8

±7.6

Input Resistance

RIN

Ω

VDD = 0.9V to 1.8V, TA = +25°C60

fIN = 1kHz

Power-Supply Rejection Ratio

PSRR

100mVP-P ripple

fIN = 20kHz

RL = 32Ω

VDD = 1.5V

RL = 16Ω

VDD = 1.0V, RL = 32Ω

Output Power (Note 2)

POUT

VDD = 0.9V, RL = 32Ω

RL = 32Ω, POUT = 12mW, f = 1kHz

0.006

Total Harmonic Distortion Plus

Noise

THD+N

RL = 16Ω, POUT = 15mW, f = 1kHz

0.015

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