Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux

ELECTRICAL CHARACTERISTICS (continued)

(VDD = PVDD = 5.0V, GND = PGND = 0V, VSHDN = 5V, CBIAS = 1µF, RIN = RF = 15k, RL = . TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

OUTPUT AMPLIFIERS (HEADPHONE MODE, HPS = VDD)

 

 

 

 

 

 

Power-Supply Rejection Ratio

 

VDD = 4.5V to 5.5V

 

 

75

106

 

 

PSRR

f = 1kHz, VRIPPLE = 200mVP-P

 

88

 

dB

(Note 2)

 

 

 

f = 20kHz, VRIPPLE = 200mVP-P

 

76

 

 

 

 

 

 

 

Output Power

POUT

fIN = 1kHz, THD+N <

RL = 32

 

88

 

mW

1%, TA = +25°C

RL = 16

 

200

 

 

 

 

 

 

 

 

 

POUT = 60mW,

 

0.002

 

 

Total Harmonic Distortion Plus

 

fIN = 1kHz,

RL = 32

 

 

 

THD+N

 

 

 

%

Noise

BW = 22Hz to 22kHz

POUT = 125mW,

 

0.002

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RL = 16

 

 

 

 

 

 

 

 

 

 

Signal-to-Noise Ratio

SNR

RL = 32, BW = 22Hz to 22kHz,

 

92

 

dB

VOUT = 1VRMS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Slew Rate

SR

 

 

 

 

1.8

 

V/µs

 

 

 

 

 

 

 

 

Maximum Capacitive Load Drive

CL

No sustained oscillations

 

2

 

nF

Crosstalk

 

fIN = 10kHz

 

 

 

78

 

dB

BIAS VOLTAGE (BIAS)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIAS Voltage

VBIAS

 

 

 

2.35

2.5

2.65

V

Output Resistance

RBIAS

 

 

 

 

50

 

k

DIGITAL INPUTS (MUTE, SHDN, HPS_EN, GAINA/B, IN1/2)

 

 

 

 

 

 

Input-Voltage High

VIH

 

 

 

2

 

 

V

Input-Voltage Low

VIL

 

 

 

 

 

0.8

V

Input Leakage Current

IIN

 

 

 

 

 

±1

µA

HEADPHONE SENSE INPUT (HPS)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input-Voltage High

VIH

 

 

 

0.9 x

 

 

V

 

 

 

VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input-Voltage Low

VIL

 

 

 

 

 

0.7 x

V

 

 

 

 

 

VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Leakage Current

IIN

 

 

 

 

 

±1

µA

Click/Pop Level

KCP

Peak voltage, A-weighted,

Into shutdown

 

-70

 

dBV

32 samples per second

 

 

 

 

Out of shutdown

 

-52

 

 

 

(Notes 2, 4)

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX9777/MAX9778

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Maxim MAX9778, MAX9777 manual Bias Voltage Bias, Digital Inputs MUTE, SHDN, HPSEN, GAINA/B, IN1/2, Headphone Sense Input HPS