Datasheet

MAX9728A/MAX9728B
60mW, DirectDrive, Stereo Headphone
Amplifier with Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1µF, R
L
= ∞, resistive load reference to ground; for MAX9728A gain = -1.5V/V
(R
IN
= 20kΩ, R
F
= 30kΩ); for MAX9728B gain = -1.5V/V (internally set), T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
BW = 22Hz to 22kHz 102
R
L
= 1kΩ,
V
OUT
= 2V
RMS A-weighted 105
BW = 22Hz to 22kHz 98
Signal-to-Noise Ratio SNR
R
L
= 32Ω,
P
OUT
= 50mW
A-weighted 101
dB
Slew Rate SR 0.5 V/µs
Capacitive Drive C
L
No sustained oscillations 100 pF
Crosstalk
L to R, R to L, f = 10kHz, R
L
= 16Ω, P
OUT
=
15mW
-70 dB
Charge-Pump Oscillator
Frequency
f
OSC
190 270 400 kHz
Into shutdown -67
Click-and-Pop Level K
CP
R
L
= 32Ω, peak voltage,
A-weighted, 32 samples per
second (Note 5)
Out of
shutdown
-64
dB
DIGITAL INPUTS (SHDN)
Input Voltage High V
INH
2V
Input Voltage Low V
INL
0.8 V
Input Leakage Current ±1 µA
Note 3: All specifications are 100% tested at T
A
= +25°C; temperature limits are guaranteed by design.
Note 4: Gain for the MAX9728A is adjustable.
Note 5: Test performed with a 32Ω resistive load connected to SGND. Mode transitions are controlled by SHDN. K
CP
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.