Rainbow Electronics MAX9758 - Manual (Page 11)

MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
______________________________________________________________________________________ 11
Typical Operating Characteristics (continued)
(V
DD
= PV
DD
= HPV
DD
= CPV
DD
= IN = +5.0V, GND = PGND = CPGND = 0V, SHDN = V
DD
, REGEN = DR = SET = GND, C
BIAS
=
1µF, C PVSS = 1µF, C1 = C2 = 1µF, PREF = unconnected, GAIN1 = 1, GAIN2 = GAIN3 = VOL = 0V, measurement BW = 22Hz to
22kHz, T A = +25°C, unless otherwise noted.)
OUTPUT NOISE
vs. FREQUENCY (LDO)
MAX9756 toc41
FREQUENCY (Hz)
NOISE (
μ
V)
10k 1k 100
20
30
40
50
60
70
80
90
100
110
10
10 100k
C OUT = 2 μF
10Hz TO 100kHz
LINE-TRANSIENT RESPONSE
MAX9756 toc42
40 μs/div
V IN
500mV/div
4.5V
5.5V
LDO_OUT
20mV/div
LOAD-TRANSIENT RESPONSE
MAX9756 toc43
20 μs/div
50V
0V
I LOAD
25mV/div
LDO_OUT = 4.65V
20mV/div
LDO SHUTDOWN RESPONSE
MAX9756 toc44
100ms/div
REGEN
5V/div
LDO_OUT
1V/div
Pin Description
PIN
MAX9756 MAX9757 MAX9758
NAME FUNCTION
1 32 32 INL Left-Channel Audio Input
2 1 1 GAIN1 Gain Control Input 1
3 2 2 GAIN2 Gain Control Input 2
4 3 3 GAIN3 Gain Control Input 3
5 4 4 BEEP Audible Alert Beep Input
6, 22 5, 21 5, 21 PGND Power Ground
7 6 6 OUTL+ Left-Channel Positive Speaker Output
8 7 7 OUTL- Left-Channel Negative Speaker Output
9,19 8,18 8, 18 PV DD Speaker Amplifier Power Supply. Bypass with 1µF ceramic capacitor to PGND.