MAX9723
Stereo DirectDrive Headphone Amplifier
with BassMax, Volume Control, and I2C
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = SHDN = 3V, PGND = SGND = 0V, C1 = C2 = 1F, BB_ = 0V. gain = 0dB, maximum volume, BassMax disabled. Load connect-
ed between OUT_ and SGND where specified. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RL = 32
Ω
59
Output Power
POUT
THD+N = 1%,
fIN = 1kHz
RL = 16
Ω (Note 5)
38
60
mW
RL = 16
Ω, POUT = 35mW, fIN = 1kHz
0.006
Total Harmonic Distortion Plus
Noise
THD+N
RL = 32
Ω, POUT = 45mW, fIN = 1kHz
0.004
%
Gain range bit 5 = 1
0
MAX9723A/
MAX9723B
Gain range bit 5 = 0
-5
dB
Gain range bit 5 = 1
+6
Maximum Gain
AMAX
MAX9723C/
MAX9723D
Gain range bit 5 = 0
+1
dB
BW = 22Hz to 22kHz
99
Signal-to-Noise Ratio
SNR
RL = 32
Ω,
VOUT = 1VRMS
A-weighted
100
dB
Slew Rate
SR
0.35
V/s
Capacitive Drive
No sustained oscillations
300
pF
Output Resistance in Shutdown
ROUT_SHDN
VSHDN = 0V, measured from OUT_ to
SGND
20
k
Ω
Output Capacitance in Shutdown
COUT_SHDN
VSHDN = 0V, measured from OUT_ to
SGND
60
pF
Into
shutdown
-69
MAX9723A/
MAX9723B
Out of
shutdown
-71
Into
shutdown
-70
Click/Pop Level
KCP
RL = 32
Ω,
peak voltage,
A-weighted,
32 samples
per second
(Notes 2, 4)
MAX9723C/
MAX9723D
Out of
shutdown
-69
dB
Charge-Pump Switching
Frequency
fCP
505
600
700
kHz
Crosstalk
XTALK
L to R or R to L, f = 10kHz,
VOUT = 1VP-P, RL = 32
Ω, both channels
loaded
80
dB
DIGITAL INPUTS (
SHDN, SDA, SCL)
Input High Voltage
VIH
0.7 x
VDD
V
Input Low Voltage
VIL
0.3 x
VDD
V
Input Leakage Current
±1A
DIGITAL OUTPUTS (SDA)
Output Low Voltage
VOL
IOL = 3mA
0.4
V
Output High Current
IOH
VSDA = VDD
1A