Datasheet

MAX9722A/MAX9722B
5V, Differential Input, DirectDrive, 130mW
Stereo Headphone Amplifiers with Shutdown
_______________________________________________________________________________________ 7
Pin Description
Typical Operating Characteristics (continued)
(MAX9722A, PV
DD
= SV
DD
= +5V, PGND = SGND = 0V, SHDN = SV
DD
, C1 = C2 = 1µF, R
L
= ∞, gain = -1V/V, single-ended input,
THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
EXIT SHUTDOWN TRANSIENT
MAX9722 toc31
200μs/div
SHDN
2V/div
OUT
500mV/div
SHUTDOWN TRANSIENT
MAX9722 toc32
400μs/div
SHDN
2V/div
OUT
500mV/div
POWER-UP/DOWN TRANSIENT
MAX9722 toc33
20ms/div
V
DD
2V/div
OUT
5mV/div
PIN
THIN QFN
TSSOP
NAME FUNCTION
13PV
DD
Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and oscillator.
Connect to positive supply (2.4V to 5.5V). Bypass with a 1µF capacitor to PGND as close to the
pin as possible.
2 4 C1P Flying Capacitor Positive Terminal
3 5 PGND Power Ground. Connect to ground.
4 6 C1N Flying Capacitor Negative Terminal
57PV
SS
Charge-Pump Output. Connect to SV
SS
.
6 8 SGND Signal Ground. Connect to ground.
7 9 INR+ Noninverting Right-Channel Audio Input
8 10 INR- Inverting Right-Channel Audio Input
9, 13
11, 15
SV
DD
Amplifier Positive Power Supply. Connect to positive supply (2.4V to 5.5V). Bypass with a 1µF
capacitor to SGND as close to the pin as possible.
10 12 OUTR Right-Channel Output
11 13 SV
SS
Amplifier Negative Power Supply. Connect to PV
SS
.
12 14 OUTL Left-Channel Output
14 16 INL- Inverting Left-Channel Audio Input
15 1 INL+ Noninverting Left-Channel Audio Input
16 2 SHDN Active-Low Shutdown Input
——EP
Exposed Paddle. The exposed paddle can be either connected to PV
SS
or a small electrically
isolated copper plane. Do not connect to PGND, SGND, PV
DD
, or SV
DD
.