max9725betct Maxim Integrated Products, Inc., max9725betct Datasheet - Page 7

• Manufacturer Part Number: max9725betct
• Description: Max9725 1v, Low-power, Directdrive, Stereo Headphone Amplifier With Shutdown
• Manufacturer: Maxim Integrated Products, Inc.

(V
to 22kHz, T
DD
THIN
QFN
1V, Low-Power, DirectDrive, Stereo Headphone
PIN
EP
10
11
12
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1
2
3
4
5
6
7
8
9
= 1.5V, PGND = SGND = 0V, V
0
0.9
A
BUMP
UCSP
= +25°C, unless otherwise noted.) (See the Functional Diagrams.)
C4
C3
C2
C1
A1
A2
A3
A4
B4
B3
B1
B2
—
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
1.1
_______________________________________________________________________________________
NAME
SGND
OUTR
PGND
SHDN
OUTL
PV
C1N
C1P
V
INR
V
INL
EP
DD
SS
SS
1.3
Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to C1N.
Inverting Charge-Pump Output. Bypass with 1µF from PV
V
Left-Amplifier Inverting Input. Connect input resistor R
only).
Right-Amplifier Inverting Input. Connect input resistor R
(MAX9725E only).
Amplifier Negative Power Supply. Must be connected to PV
Signal Ground. SGND must be connected to PGND. SGND is the ground reference for the input and
output signal.
Right-Channel Output. Connect feedback resistor R
Left-Channel Output. Connect feedback resistor R
Positive Power-Supply Input. Bypass with a 1µF capacitor to PGND.
Flying Capacitor Positive Terminal. Connect a 1µF capacitor from C1P to C1N.
Power Ground. Ground reference for the internal charge pump. PGND must be connected to SGND.
Active-Low Shutdown. Connect to V
charge pump.
Exposed Paddle. Internally connected to V
SS
.
SHDN
1.5
= 1.5V, V
500mV/div
1V/div
SHDN
OUT_
Typical Operating Characteristics (continued)
SS
= PV
SS,
EXITING SHUTDOWN
C1 = C2 = 1µF, C
Amplifier with Shutdown
200μs/div
DD
for normal operation. Pull low to disable the amplifier and
SS
FUNCTION
. Leave paddle unconnected or solder to V
MAX9725 toc23
IN
FB
FB
= 1µF, THD+N measurement bandwidth = 22Hz
between OUTL and INL (MAX9725E only).
IN
between OUTR and INR (MAX9725E only).
IN
from input capacitor C1N to INL (MAX9725E
SS
from input capacitor C1N to INR
SS
to PGND. PV
.
POWER-UP/-DOWN WAVEFORM
SS
Pin Description
200ms/div
must be connected to
SS
MAX9725toc24
.
V
1V/div
OUT_
10mV/div
DD
7