Datasheet

MAX9724A/MAX9724B
60mW, DirectDrive, Stereo Headphone Amplifier
with Low RF Susceptibility and Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND..............................................................-0.3V to +6V
PV
SS
to SV
SS
.........................................................-0.3V to +0.3V
PGND to SGND .....................................................-0.3V to +0.3V
C1P to PGND..............................................-0.3V to (V
DD
+ 0.3V)
C1N to PGND............................................(PV
SS
- 0.3V) to +0.3V
PV
SS
and SV
SS
to PGND..........................................-6V to +0.3V
IN_ to SGND (MAX9724A)..........................-0.3V to (V
DD
+ 0.3V)
IN_ to SGND (MAX9724B) .............(SV
SS
- 0.3V) to (V
DD
+ 0.3V)
OUT_ to SV
SS
(Note 1) ....-0.3V to Min (V
DD
- SV
SS
+ 0.3V, +9V)
OUT_ to V
DD
(Note 2) ......+0.3V to Max (SV
SS
- V
DD
- 0.3V, -9V)
SHDN to _GND.........................................................-0.3V to +6V
OUT_ Short Circuit to GND ........................................Continuous
Short Circuit between OUTL and OUTR ....................Continuous
Continuous Input Current into PV
SS
..................................260mA
Continuous Input Current (any other pin) .........................±20mA
Continuous Power Dissipation (T
A
= +70°C, Multilayer board)
12-Bump UCSP (derate 6.5mW/°C above +70°C) ........519mW
θ
JA
................................................................................154 C/W
12-Pin TQFN (derate 16.7mW/°C above +70°C) .........1333mW
θ
JA
..................................................................................60°C/W
θ
JC
..................................................................................11°C/W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering) Reflow............................+235°C
ELECTRICAL CHARACTERISTICS
(V
DD
= 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1µF, R
L
= ∞, resistive load reference to ground; for MAX9724A gain = -1.5V/V
(R
IN
= 20kΩ, R
F
= 30kΩ); for MAX9724B gain = -1.5V/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 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
Supply Voltage Range V
DD
Guaranteed by PSRR test 2.7 5.5 V
Quiescent Current I
CC
3.5 5.5 mA
Shutdown Current I
SHDN
SHDN = SGND = PGND 0.1 1 µA
Shutdown to Full Operation t
SON
180 µs
Input Impedance R
IN
MAX9724B, measured at IN_ 12 19 28 kΩ
Output Offset Voltage V
OS
(Note 4) ±1.5 ±10 mV
V
DD
= 2.7V to 5.5V, T
A
= +25°C 69 86
f = 1kHz, 100mV
P-P
(Note 4) 80Power-Supply Rejection Ratio PSRR
f = 20kHz, 100mV
P-P
(Note 4) 65
dB
R
L
= 32Ω, THD+N = 1% 30 63
Output Power (TQFN) P
OUT
R
L
= 16Ω, THD+N = 1% 42
mW
R
L
= 32Ω, THD+N = 1% 25 45
Output Power (UCSP) P
OUT
R
L
= 16Ω, THD+N = 1% 35
mW
Voltage Gain A
V
MAX9724B (Note 5) -1.52 -1.5 -1.48 V/V
Channel-to-Channel Gain Tracking MAX9724B ±0.15 %
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.003
R
L
= 32Ω, P
OUT
= 50mW, f
IN
= 1kHz 0.02
Total Harmonic Distortion Plus
Noise (TQFN) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 35mW, f
IN
= 1kHz 0.04
%
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.003
R
L
= 32Ω, P
OUT
= 45mW, f
IN
= 1kHz 0.03
Total Harmonic Distortion Plus
Noise (UCSP) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 32mW, f
IN
= 1kHz 0.05
%
BW = 22Hz to 22kHz 102
R
L
= 1kΩ,
V
OUT
= 2V
RMS
A-weighted 105
BW = 22Hz to 22kHz 98
Signal-to-Noise Ratio SNR
R
L
= 32Ω,
P
OUT
= 50mW
A-weighted 101
dB
Note 1: OUTR and OUTL should be limited to no more than 9V above SV
SS
, or above V
DD
+ 0.3V, whichever limits first.
Note 2: OUTR and OUTL should be limited to no more than 9V below V
DD
, or below SV
SS
- 0.3V, whichever limits first.