Datasheet

MAX9724A/MAX9724B
60mW, DirectDrive, Stereo Headphone Amplifier
with Low RF Susceptibility and Shutdown
_______________________________________________________________________________________ 7
0
-120
10 100 10k 100k
CROSSTALK vs. FREQUENCY
-100
-80
-40
-60
-20
MAX9724 toc28
FREQUENCY (Hz)
CROSSTALK (dB)
1k
RIGHT TO LEFT
LEFT TO RIGHT
P
OUT
= 15mW
R
L
= 16Ω
20
40
30
60
50
70
80
0 100 15050
OUTPUT POWER vs. LOAD RESISTANCE AND
CHARGE-PUMP CAPACITOR SIZE (TQFN)
MAX9724 toc29
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
V
DD
= 5V
f
IN
= 1kHz
THD+N = 1%
C1 = C2 = 2.2μF
C1 = C2 = 1μF
C1 = C2 = 0.47μF
0
40
30
20
10
60
50
70
80
0 100 15050
OUTPUT POWER vs. LOAD RESISTANCE AND
CHARGE-PUMP CAPACITOR SIZE (UCSP)
MAX9724 toc30
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
V
DD
= 5V
f
IN
= 1kHz
THD+N = 1%
C1 = C2 = 2.2μF
C1 = C2 = 1μF
C1 = C2 = 0.47μF
-140
-110
-130
-70
-90
-50
-120
-80
-100
-60
-40
0 5 10 15 20
OUTPUT SPECTRUM vs. FREQUENCY
MAX9724 toc31
FREQUENCY (kHz)
AMPLITUDE (dBV)
R
L
= 32Ω
V
DD
= 3V
f
IN
= 1kHz
V
OUT
= -60dBV
2.8
3.1
2.9
3.3
3.0
3.4
3.2
3.5
2.5 3.0 4.03.5 4.5 5.0 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9724 toc32
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
NO LOAD
INPUTS
GROUND
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE (TQFN)
MAX9724 toc33
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (nA)
5.04.54.03.53.0
20
40
60
80
100
120
140
0
2.5 5.5
NO LOAD INPUTS GND
Typical Operating Characteristics (continued)
(V
DD
= 5V, PGND = SGND = 0V, SHDN = V
DD
, C1 = C2 = 1µF, R
L
= ∞, gain = -1.5V/V (R
IN
= 20kΩ, R
F
= 30kΩ for the MAX9724A),
THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T
A
= +25°C, unless otherwise noted.)