Datasheet

(V
DD
= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = 1μF, BB_ = 0V. gain = 0dB, maximum volume, BassMax disabled. Load connected
between OUT_ and SGND where specified. 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
Output Power P
OUT
THD+N = 1%,
f
IN
= 1kHz
R
L
= 32Ω 59
mW
R
L
= 16Ω (Note 5) 38 60
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16Ω, P
OUT
= 35mW, f
IN
= 1kHz 0.006
%
R
L
= 32Ω, P
OUT
= 45mW, f
IN
= 1kHz 0.004
Maximum Gain A
MAX
MAX9723A/
MAX9723B
Gain range bit 5 = 1 0
dB
Gain range bit 5 = 0 -5
MAX9723C/
MAX9723D
Gain range bit 5 = 1 +6
dB
Gain range bit 5 = 0 +1
Signal-to-Noise Ratio SNR
R
L
= 32Ω,
V
OUT
= 1V
RMS
BW = 22Hz to 22kHz 99
dB
A-weighted 100
Slew Rate SR 0.35 V/µs
Capacitive Drive No sustained oscillations 300 pF
Output Resistance in Shutdown R
OUT_SHDN
V
SHDN
= 0V, measured from OUT_ to
SGND
20 kΩ
Output Capacitance in Shutdown C
OUT_SHDN
V
SHDN
= 0V, measured from OUT_ to
SGND
60 pF
Click/Pop Level K
CP
R
L
= 32Ω,
peak voltage,
A-weighted,
32 samples
per second
(Notes 2, 4)
MAX9723A/
MAX9723B
Into
shutdown
-69
dB
Out of
shutdown
-71
MAX9723C/
MAX9723D
Into
shutdown
-70
Out of
shutdown
-69
Charge-Pump Switching
Frequency
f
CP
505 600 700 kHz
Crosstalk XTALK
L to ≥ or ≥ to L, f = 10kHz,
V
OUT
= 1V
P-P
, R
L
= 32Ω, both channels
loaded
80 dB
DIGITAL INPUTS (SHDN, SDA, SCL)
Input High Voltage V
IH
0.7 x
V
DD
V
Input Low Voltage V
IL
0.3 x
V
DD
V
Input Leakage Current P1 µA
DIGITAL OUTPUTS (SDA)
Output Low Voltage V
OL
I
OL
= 3mA 0.4 V
Output High Current I
OH
V
SDA
= V
DD
1 µA
MAX9723 Stereo DirectDrive Headphone Amplier
with BassMax, Volume Control, and I
2
C
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics (continued)