MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
_______________________________________________________________________________________ 9
vs. SUPPLY VOLTAGE
vs. SUPPLY VOLTAGE
Typical Operating Characteristics (continued)
(V
DD
= PV
DD
= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, C
IN
= 1µF (1206 case size, X7R dielectric ceramic capacitor),
BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB (total voltage gain = 3.5dB), BassMax disabled. Load
connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. Both channels loaded and driven
in phase. T
A
= +25°C, unless otherwise noted.)
Pin Description
PIN NAME FUNCTION
1 INR2 Right-Channel Input 2
2 INR3 Right-Channel Input 3
3 SGND Signal Ground. Connect SGND to PGND at a single point on the PCB near the device.
4, 8, 15,
22
N.C. No Connection. Not internally connected.
5 ADD
Slave Address Selection Input. Connect ADD to V
DD
to set the device slave address to 1010001 or to
PGND to set the device slave address to 1010000.
6PV
SS
Charge-Pump Output. Connect to SV
SS
.
7 SDA Serial Data Input. Connect a pullup resistor greater than 500Ω from SDA to PV
DD
.
9 C1N Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P and C1N.
10 PGND Power Ground. Connect PGND to SGND at a single point on the PCB near the device.
11 C1P Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P and C1N.
12 SCL Serial Clock Input. Connect a pullup resistor greater than 500Ω from SCL to PV
DD
.
13 PV
DD
Charge-Pump and Logic Power-Supply Input. Bypass PV
DD
to PGND with a 1µF capacitor and connect
to V
DD
. PV
DD
and V
DD
are internally connected and should each have a 1µF bypass capacitor located
as close to the device as possible.
14 SV
SS
Headphone Amplifier Negative Power-Supply Input. Connect to PV
SS
and bypass with a 1µF capacitor
to PGND.
