Datasheet
MAX9722A/MAX9722B
5V, Differential Input, DirectDrive, 130mW
Stereo Headphone Amplifiers with Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(PV
DD
= SV
DD
= +5V, PGND = SGND = 0V, SHDN = SV
DD
, C1 = C2 = 1µF, R
L
= ∞, resistive load referenced to ground, for
MAX9722A gain = -1V/V (R
IN
= R
F
= 10kΩ), for MAX9722B gain = -2V/V (internally set), T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
Note 1: All specifications are 100% tested at T
A
= +25°C; temperature limits are guaranteed by design.
Note 2: Gain for the MAX9722A is adjustable.
Note 3: The amplifier inputs are AC-coupled to ground through C
IN
_.
Note 4: Measurement bandwidth is 22Hz to 22kHz.
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
R
L
= 16Ω, P
OUT
= 55mW, f = 1kHz
0.03
Total Harmonic Distortion Plus
Noise (Note 4)
THD+N
R
L
= 32Ω, P
OUT
= 125mW, f = 1kHz
0.009
%
Signal-to-Noise Ratio SNR R
L
= 32Ω, P
OUT
= 20mW, f = 22Hz to 22kHz
100
dB
Noise V
n
22Hz to 22kHz bandwidth, input AC grounded 6
µV
RMS
Slew Rate SR
0.5
V/µs
Maximum Capacitive Load C
L
No sustained oscillation
200
pF
Charge-Pump Oscillator
Frequency
f
OSC
505 600 800
kHz
Crosstalk R
L
= 32Ω, V
IN
= 200mV
P-P
, f = 10kHz, A
V
= 1 78 dB
ESD Protection Human Body Model (OUTR and OUTL) ±8kV
Thermal-Shutdown Threshold
145
°C
Thermal-Shutdown Hysteresis 5 °C
Typical Operating Characteristics
(MAX9722A, PV
DD
= SV
DD
= +5V, PGND = SGND = 0V, SHDN = SV
DD
, C1 = C2 = 1µF, R
L
= ∞, gain = -1V/V, single-ended input,
THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9722 toc01
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
10
0.0001
10 100k
V
DD
= 3V
A
V
= -1V/V
R
L
= 16
Ω
P
OUT
= 30mW
P
OUT
= 5mW
P
OUT
= 15mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9722 toc02
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
10
0.0001
10 100k
V
DD
= 3V
A
V
= -1V/V
R
L
= 32Ω
P
OUT
= 40mW
P
OUT
= 5mW
P
OUT
= 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9722 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
10
0.0001
10 100k
V
DD
= 5V
A
V
= -1V/V
R
L
= 16
Ω
P
OUT
= 40mW
P
OUT
= 5mW
P
OUT
= 60mW