User Manual

MAX9820
DirectDrive Headphone Amplifier
with External Gain
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
DD
= 2.7V to 5.5V, T
A
= +25°C (Note 3) 75 90
f = 1kHz, 200mV
P-P
(Note 3) 73
Power-Supply Rejection Ratio PSRR
f = 20kHz, 200mV
P-P
(Note 3) 55
dB
V
DD
= 3.6V 45
Z
LOAD
= 32Ω + 1µH, f = 1kHz,
THD+N = 1%
V
DD
= 5.0V 95
V
DD
= 3.6V 32
Output Power P
OUT
Z
LOAD
= 16Ω + 1µH, f = 1kHz,
THD+N = 1%
V
DD
= 5.0V 75
mW
Z
LOAD
= 16Ω + 1µH, f = 1kHz, P
OUT
= 20mW 0.014
Z
LOAD
= 32Ω + 1µH, f = 1kHz, P
OUT
= 20mW 0.005
Total Harmonic Distortion
Plus Noise
THD+N
Z
LOAD
= 10kΩ, f = 1kHz, V
OUT
= 1V
RMS
0.001
%
Signal-to-Noise Ratio SNR Z
LOAD
= 32Ω + 1µH, P
OUT
= 25mW, A-weighted 105 dB
Output Noise V
NOISE
A-weighted (Note 3) 9 µV
Z
LOAD
= 32Ω + 1µH
FS = 0.300V
RMS
,
V
OUT
= 30mV
RMS
73
Crosstalk
L to R, R to L,
BW = 20Hz to 15kHz
Z
LOAD
= 10kΩ
FS = 0.707V
RMS
,
V
OUT
= 70.7mV
RMS
73
dB
Capacitive Load Drive C
L
No sustained oscillations 200 pF
Oscillator Frequency f
OSC
T
A
= +25°C 300 500 800 kHz
Thermal Shutdown 145 °C
Thermal Shutdown Hysteresis 15 °C
DIGITAL INPUT (SHDN)
Input Voltage High V
INH
1.2 V
Input Voltage Low V
INL
0.3 V
Input Leakage Current I
LEAKAGE
T
A
= +25°C ±1 µA
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
SHDN
= 5V, V
GND
= 0V, R
IN
= R
FB
= 40.2kΩ (gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, R
LOAD
= ∞, T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
Note 2: All specifications are 100% tested at T
A
= +25°C; temperature limits are guaranteed by design.
Note 3: The amplifier inputs are AC-coupled to GND.
Note 4: Mode transitions are controlled by SHDN.