Owner manual

MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (3V Supply) (continued)
(V
DD
= PV
DD
= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation
setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N
measurement BW = 22Hz to 22kHz. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Into shutdown 81
Click-and-Pop Level K
CP
Peak voltage, A-
weighted, 32 samples
per second
(Notes 3 and 5)
Out of shutdown 80
dBV
Charge-Pump Switching Frequency f
CP
505 600 730 kHz
Crosstalk
L to R, or R to L, f = 10kHz, V
OUT
=
1V
RMS
, R
L
= 32Ω, both channels loaded
78 dB
DIGITAL INPUTS (SHDN, SDA, SCL, BEEP_EN)
Input High Voltage V
IH
1.4 V
Input Low Voltage V
IL
0.4 V
Input Leakage Current -1 +1 µA
DIGITAL OUTPUTS (SDA)
Output Low Voltage V
OL
I
OL
= 3mA 0.4 V
Output High Current I
OH
V
SDA
= V
DD
1µA
ELECTRICAL CHARACTERISTICS (2.4V Supply)
(V
DD
= PV
DD
= SHDN = 2.4V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation
setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N
measurement BW = 22Hz to 22kHz. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Quiescent Current I
DD
No load (Note 3) 4.5 mA
Shutdown Current I
SHDN
V
SHDN
= 0V 4 µA
R
L
= 16Ω 32
Output Power P
OUT
THD+N = 1%,
f
IN
= 1kHz, overall
gain = 3.5dB,
T
A
= +25°C
(Note 4)
R
L
= 32Ω 32
mW
R
L
= 16Ω ,
P
OU T
= 23m W
0.03
Total Harmonic Distortion Plus
Noise
THD+N
f
IN
= 1kHz, overall
gain = 3.5dB
(Note 4)
R
L
= 32Ω ,
P
OU T
= 23m W
0.03
%
f = 217Hz 90
f = 1kHz 85
Power-Supply Rejection Ratio PSRR
100mV
P-P
ripple
(Note 3)
f = 10kHz 61
dB