Instruction Manual

MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
4 _______________________________________________________________________________________
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
CHARGE PUMP
Charge-Pump Frequency f
OSC
500 550 600
kHz
VOLUME CONTROL
VOL Input Impedance R
VOL
100
MΩ
VOL Input Hysteresis 10 mV
Full Mute Voltage (Note 7)
0.858 x
HPV
DD
V
Full Mute Attenuation f
IN
= 1kHz -85 dB
Input Impedance R
VOL_
Any gain setting
100
MΩ
A
V
= +15dB to 0dB
±0.2
A
V
= -2dB to -20dB
±0.3
Channel Matching
A
V
= -22dB to -56dB
±1.0
dB
BEEP INPUT
Beep Signal Amplitude Threshold
T
A
= +25°C, R
B
= 47kΩ (see BEEP Input
section)
0.3 V
Beep Signal Frequency
Threshold
T
A
= +25°C
300
Hz
AUTOMATIC LEVEL CONTROL SPEAKER AMPLIFIER (MAX9756/MAX9757)
PREF Threshold Accuracy R
PREF
= 180kΩ 5 8.1 %
Maximum Gain Compression 6.0 6.3 dB
Attack Time C
T
= 1µF (Note 8) 15 ms
Hold Time Time between attack and release phases 50 ms
0V < V
DR
< (0.3V x V
DD
)30
0.4V < V
DR
< (0.6V x V
DD
)
9.5Release Time (Note 9)
C
T
= 1µF,
release from
6dB
0.8V < V
DR
< V
DD
3
s
DR INPUT (TRI-STATE INPUT)
DR Input Voltage High V
DRH
0.8 x
V
DD
V
DD
V
DR Input Voltage Middle V
DRM
0.4 x
V
DD
0.6 x
V
DD
V
DR Input Voltage Low V
DRL
0
0.3 x
V
DD
V
Input Leakage Current 0V ≤ V
DR
≤ V
DD
±1 µA
LOGIC INPUTS (GAIN_, SHDN, REGEN)
Input High Voltage V
IH
2V
Input Low Voltage V
IL
0.8 V
Input Leakage Current I
IN
±1 µA