Datasheet

MAX9724A/MAX9724B
60mW, DirectDrive, Stereo Headphone Amplifier
with Low RF Susceptibility and Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1µF, R
L
= ∞, resistive load reference to ground; for MAX9724A gain = -1.5V/V
(R
IN
= 20kΩ, R
F
= 30kΩ); for MAX9724B 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
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 (Notes 4, 7)
Out of
shutdown
-64
dB
DIGITAL INPUTS (SHDN)
Input-Voltage High V
INH
(TQFN only) 2 V
Input-Voltage Low V
INL
(TQFN only) 0.8 V
Input-Voltage High V
INH
(UCSP only) 1.4 V
Input-Voltage Low V
INL
(UCSP only) 0.9 V
Input Leakage Current ±1 µA
ELECTRICAL CHARACTERISTICS
(V
DD
= 3V, PGND = SGND, SHDN = 3V, C1 = C2 = 1µF, R
L
= ∞, resistive load reference to ground; for MAX9724A gain = -1.5V/V
(R
IN
= 20kΩ, R
F
= 30kΩ); for MAX9724B 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
Quiescent Current I
CC
3.0 mA
Shutdown Current I
SHDN
SHDN = SGND = PGND 0.1 µA
f = 1kHz, 100mV
P-P
80
Power-Supply Rejection Ratio
(Note 4)
PSRR
f = 20kHz, 100mV
P-P
65
dB
R
L
= 32Ω, THD+N = 1% 20
Output Power (TQFN) P
OUT
R
L
= 16Ω, THD+N = 1% 14
mW
R
L
= 32Ω, THD+N = 1% 17
Output Power (UCSP) P
OUT
R
L
= 16Ω, THD+N = 1% 12
mW
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.05
R
L
= 32Ω, P
OUT
= 15mW, f
IN
= 1kHz 0.03
Total Harmonic Distortion Plus
Noise (TQFN) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 10mW, f
IN
= 1kHz 0.06
%
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.003
R
L
= 32Ω, P
OUT
= 15mW, f
IN
= 1kHz 0.04
Total Harmonic Distortion Plus
Noise (UCSP) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 10mW, f
IN
= 1kHz 0.06
%
Note 3: All specifications are 100% tested at T
A
= +25°C; temperature limits are guaranteed by design.
Note 4: The amplifier inputs are AC-coupled to GND.
Note 5: Gain for the MAX9724A is adjustable.
Note 6: Measurement bandwidth is 22Hz to 22kHz.
Note 7: Test performed with a 32Ω resistive load connected to GND. Mode transitions are controlled by SHDN. K
CP
level is calculated
as 20log[(peak voltage during mode transition, no input signal)/(peak voltage under normal operation at rated power level)].
Units are expressed in dB.