Instruction Manual

MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
= HPV
DD
= CPV
DD
= IN = +5.0V, GND = PGND = CPGND = 0, SHDN = V
DD
, REGEN = V
DD
, DR = SET = GND, C
BIAS
= 1µF, C
PVSS
= 1µF, C1 = C2 = 1µF, PREF = unconnected, speaker loads terminated between OUT_+ and OUT_-, headphone load
terminated between HP_ and GND, GAIN1 = GAIN2 = GAIN3 = VOL = 0 (A
V(SP)
= 15dB, A
V(HP)
= 0dB), T
A
= -40°C to +85°C, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
Supply Voltage (V
DD
, PV
DD
, HPV
DD
, CPV
DD
, IN to GND) ....+6V
PGND, CPGND to GND ......................................................±0.3V
CPV
SS
, C1N, V
SS
to GND......................................-6.0V to +0.3V
HP_ to GND ...........................................................................±3V
Any Other Pin .............................................-0.3V to (V
DD
+ 0.3V)
Duration of OUT_ Short Circuit to GND or PV
DD
........Continuous
Duration of OUT_+ Short Circuit to OUT_- .................Continuous
Duration of HP_ Short Circuit to GND,
V
SS
, or HPV
DD
.........................................................Continuous
Duration of OUT Short Circuit to GND........................Continuous
Continuous Current (PV
DD
, OUT_, PGND) ...........................1.7A
Continuous Current (CPV
DD
, C1N, CPGND, C1P, CPV
SS
,
V
SS
, HPV
DD
, HP_, IN, OUT).............................................0.85A
Continuous Input Current (all other pins) .........................±20mA
Continuous Power Dissipation (T
A
= +70°C, single-layer board)
32-Pin Thin QFN (derate 18.6mW/°C above +70°C).....1490mW
36-Pin Thin QFN (derate 20.4mW/°C above +70°C).....1633mW
Continuous Power Dissipation (T
A
=+70°C, multilayer board)
32-Pin Thin QFN (derate 24.9mW/°C above +70°C).....1990mW
36-Pin Thin QFN (derate 27.7mW/°C above +70°C).....2180mW
Junction Temperature .....................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL
Supply Voltage Range
V
DD
, PV
DD
Inferred from PSRR test 4.5 5.5 V
Headphone Supply Voltage HPV
DD
Inferred from PSRR test 3.0 5.5 V
HPS = GND, speaker
mode, R
L
= ∞
14 29
Quiescent Supply Current I
DD
I
DD
= I
VDD
+
I
HPVDD
+ I
CPVDD
HPS = 5V, headphone
mode, R
L
= ∞
713
mA
Shutdown Supply Current I
SHDN
SHDN = REGEN = GND 0.2 5 µA
Bias Voltage V
BIAS
2.2
2.43 2.65
V
Switching Time t
SW
Gain or input switching 10 µs
Input Resistance R
IN
INL and INR 10 20 30 kΩ
Turn-On Time t
SON
25 ms
SPEAKER AMPLIFIERS (HPS = GND)
Output Offset Voltage V
OS
Measured between OUT_+ and OUT_-,
T
A
= +25°C
±0.4 ±15
mV
PV
DD
= 4.5V to 5.5V, T
A
= +25°C 75 95
f = 1kHz, V
RIPPLE
= 200mV
P-P
83
Power-Supply Rejection Ratio
(Note 2)
PSRR
f = 10kHz, V
RIPPLE
= 200mV
P-P
68
dB
R
L
= 8Ω 0.9 1.3
R
L
= 4Ω 2.0
Output Power (Note 3) P
OUT
THD+N = 1%, f = 1kHz
(T
A
= +25°C)
R
L
= 3Ω 2.3
W
R
L
= 8Ω, BTL P
OUT
= 1W, f = 1kHz
0.009
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 4Ω, BTL P
OUT
= 1W, f = 1kHz
0.015
%
R
L
= 8Ω, BTL P
OUT
= 1W, BW = 22Hz to
22kHz, unweighted
92
Signal-to-Noise Ratio SNR
R
L
= 8Ω, BTL P
OUT
= 1W, A weighted 95
dB