Datasheet

MAX9728A/MAX9728B
60mW, DirectDrive, Stereo Headphone
Amplifiers with Shutdown
6 _______________________________________________________________________________________
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 MAX9728A),
THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T
A
= +25°C, unless otherwise noted.)
Pin Description
PIN
TQFN TSSOP
NAME FUNCTION
1 3 C1P Flying Capacitor Positive Terminal. Connect a 1µF ceramic capacitor from C1P to C1N.
2 4 PGND Power Ground. Connect to SGND.
3 5 C1N Flying Capacitor Negative Terminal. Connect a 1µF ceramic capacitor from C1P to C1N.
47PV
SS
Charge-Pump Output. Connect to SV
SS
and bypass with a 1µF ceramic capacitor to PGND.
58SHDN Active-Low Shutdown Input
6 9 INL Left-Channel Input
7 10 SGND Signal Ground. Connect to PGND.
8 11 INR Right-Channel Input
912SV
SS
Amplifier Negative Supply. Connect to PV
SS
.
10 14 OUTR Right-Channel Output
11 1 OUTL Left-Channel Output
12 2 V
DD
Positive Power-Supply Input. Bypass with a 1µF capacitor to PGND.
— 6,13 N.C. No Connection. Not internally connected.
EP — EP Exposed Paddle. Leave this connection floating or connect it to SV
SS
.
EXITING SHUTDOWN
MAX9728A/28B toc13
V
SHDN
5V/div
V
OUT_
500mV/div
V
IN_
1V/div
40
μs/div
ENTERING SHUTDOWN
MAX9728A/28B toc14
V
SHDN
5V/div
V
OUT_
500mV/div
V
IN_
1V/div
20
μs/div