Instruction Manual

MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
_______________________________________________________________________________________ 5
Note 1: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 2: PSRR is specified with the amplifier input connected to GND through R
IN
and C
IN
.
Note 3: Output power levels are measured with the TQFN’s exposed paddle soldered to the ground plane.
Note 4: Speaker path gain is defined as: A
VSPKR
= (V
OUT+
- V
OUT-
)/V
IN__
).
Note 5: Speaker mode testing performed with 8Ω resistive load connected across BTL output. Headphone mode testing per-
formed with 32Ω resistive load connected between HP_ and GND. Mode transitions are controlled by SHDN.
Note 6: Headphone path gain is defined as: A
VHP
= V
HP_
/V
IN__
.
Note 7: See Table 3 for detains on the mute levels.
Note 8: Attack envelope is exponential. Attack time is defined as the 15 x 10
3
x C
T
.
Note 9: Time for the gain to return to within 10% of nominal gain setting after the input signal has fallen below the PREF threshold.
Release is linear in dB. Release time is proportional to magnitude of gain compression.
Note 10: Dropout voltage is defined as (V
IN
- V
OUT
) when V
OUT
is 2% below the value of V
OUT
for V
IN
= V
OUT(NOM)
+ 1V.
ELECTRICAL CHARACTERISTICS (continued)
(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)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
LOGIC INPUT HEADPHONE (HPS)
Input High Voltage V
IH
2V
Input Low Voltage V
IL
0.8 V
HPS Pullup Current 35 µA
LOW-DROPOUT LINEAR REGULATOR
Input Voltage Range V
IN
Inferred from line regulation 3.5 5.5 V
I
OUT
= 0mA, SHDN = GND
100 160
Supply (Ground) Current I
Q
I
OUT
= 150mA
350
µA
Shutdown Current I
SHDN
REGEN = 0V 0.1 3 µA
Output Current I
OUT
150
mA
Fixed Output Voltage Accuracy I
OUT
= 1mA
±1.5
%
Adjustable Output Voltage Range
V
SET
4.85
V
SET Reference Voltage V
SET
1.19 1.21 1.23
V
SET Dual-Mode Threshold
200
mV
SET Input Leakage Current I
SET
±20 ±500
nA
I
OUT
= 50mA 25 50
Dropout Voltage (Note 10) ΔV
OD
V
OUT
= 4.65V (fixed
output operation)
I
OUT
= 150mA
100 150
mV
Output Current Limit I
LIM
300
mA
Startup Time 20 µs
Line Regulation
V
IN
= 3.5V to 5.5V, V
OUT
= 2.5V,
I
OUT
= 1mA
-0.1 +0.01 +0.1
%/V
Load Regulation V
OUT
= 4.65V, 1mA < I
OUT
< 150mA 0.5 %
f = 1kHz 60
Ripple Rejection V
RIPPLE
= 200mV
P-P
f = 10kHz 50
dB
Output Voltage Noise
20Hz to 22kHz, C
OUT
= 2 x 1µF,
I
OUT
= 150mA, V
OUT
= 4.65V
100
µV
RMS