Datasheet

MAX9724A/MAX9724B
60mW, DirectDrive, Stereo Headphone Amplifier
with Low RF Susceptibility and Shutdown
8 _______________________________________________________________________________________
Pin Description
PIN
TQFN UCSP
NAME FUNCTION
1 C1 C1P Flying Capacitor Positive Terminal. Connect a 1µF ceramic capacitor from C1P to C1N.
2 C2 PGND Power Ground. Connect to SGND.
3 C3 C1N Flying Capacitor Negative Terminal. Connect a 1µF ceramic capacitor from C1P to C1N.
4C4PV
SS
Charge-Pump Output. Connect to SV
SS
and bypass with a 1µF ceramic capacitor to PGND.
5A2SHDN Active-Low Shutdown Input
6 B3 INL Left-Channel Input
7 A1 SGND Signal Ground. Connect to PGND.
8 B2 INR Right-Channel Input
9B4SV
SS
Amplifier Negative Supply. Connect to PV
SS
.
10 A3 OUTR Right-Channel Output
11 A4 OUTL Left-Channel Output
12 B1 V
DD
Positive Power-Supply Input. Bypass with a 1µF capacitor to PGND.
EP — EP Exposed Paddle. Internally connected to SV
SS
. Connect to SV
SS
or leave unconnected.
EXITING SHUTDOWN
MAX9724 toc34
V
SHDN
5V/div
V
OUT_
500mV/div
V
IN_
1V/div
40
μs/div
ENTERING SHUTDOWN
MAX9724 toc35
V
SHDN
5V/div
V
OUT_
500mV/div
V
IN_
1V/div
20
μs/div
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.)