60mW, DirectDrive, Stereo Headphone

Amplifier with Shutdown

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3

ELECTRICAL CHARACTERISTICS (continued)

(VDD = 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1µF, RL =

∞, resistive load reference to ground; for MAX9728A gain = -1.5V/V

(RIN = 20k

Ω, RF = 30kΩ); for MAX9728B gain = -1.5V/V (internally set), TA = -40°C to +85°C, unless otherwise noted. Typical values

are at TA = +25°C, unless otherwise noted.) (Note 3)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

BW = 22Hz to 22kHz

102

RL = 1k

Ω,

VOUT = 2VRMS

A-weighted

105

BW = 22Hz to 22kHz

98

Signal-to-Noise Ratio

SNR

RL = 32

Ω,

POUT = 50mW

A-weighted

101

dB

Slew Rate

SR

0.5

V/µs

Capacitive Drive

CL

No sustained oscillations

100

pF

Crosstalk

L to R, R to L, f = 10kHz, RL = 16

Ω, POUT =

15mW

-70

dB

Charge-Pump Oscillator

Frequency

fOSC

190

270

400

kHz

Into shutdown

-67

Click-and-Pop Level

KCP

RL = 32

Ω, peak voltage,

A-weighted, 32 samples per

second (Note 5)

Out of

shutdown

-64

dB

DIGITAL INPUTS (SHDN)

Input Voltage High

VINH

2V

Input Voltage Low

VINL

0.8

V

Input Leakage Current

±1

µA

Note 3: All specifications are 100% tested at TA = +25°C; temperature limits are guaranteed by design.

Note 4: Gain for the MAX9728A is adjustable.

Note 5: Test performed with a 32

Ω resistive load connected to SGND. Mode transitions are controlled by SHDN. KCP level is calcu-

lated as 20log[(peak voltage during mode transition, no input signal)/(peak voltage under normal operation at rated power

level)]. Units are expressed in dB.