Electrical characteristics (continued) – Rainbow Electronics MAX9792 User Manual
Page 5
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
5
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
COM Input Range
V
COM
Inferred from CMRR test
-300
+300
mV
Common-Mode Rejection Ratio
CMRR
-300mV
< V
COM
<
+300mV
60
dB
Slew Rate
SR
0.38
V/µs
Charge-Pump Frequency
f
OSC
530
kHz
BEEP INPUT (LDO_EN = 1)
Beep Signal Minimum Frequency
f
BEEP
Four-cycle count
215
Hz
Amplifier Turn-On Time
t
ONBEEP
400
µs
Amplifier Hold Time
t
HOLDBEEP
221
246
271
ms
LOW-DROPOUT LINEAR REGULATOR
Regulator Input Voltage Range
V
AVDD
Inferred from line regulation,
V
LDO_OUT
= 4.75V
4.5
5.5
V
LDO Ground Current
I
LDO
0.25
0.4
mA
Output Current
I
OUT
Inferred from load regulation
120
mA
Current Limit
I
LIM
300
mA
Crosstalk
Speaker to LDO, V
LDO_OUT
= 4.75V,
f =1kHz, I
LDO_OUT
= 10mA, speaker P
OUT
= 1.2W, R
L
= 8
Ω
-80
dB
V
LDO_OUT
= 4.75V
±1.5
Output-Voltage Accuracy
V
LDO_OUT
= 3.3V
±1.5
%
I
OUT
= 50mA
46
Dropout Voltage
V
DO
V
LDO_OUT
= 4.75V,
T
A
= +25
°C (Note 7)
I
OUT
= 120mA
106
mV
Startup Time
30
µs
V
LDO_OUT
= 4.75V
-4.8
1.5
+4.8
Line Regulation
V
AVDD
= 4.5V to
5.5V,
I
LDO_OUT
= 1mA
V
LDO_OUT
= 3.3V
-4
0.2
+4
mV/V
Load Regulation
V
LDO_OUT
= 4.75V, 1mA < I
LDO_OUT
<
120mA
0.22
mV/mA
f = 1kHz
56
Ripple Rejection
V
RIPPLE
= 200mV
P-P
,
V
LDO_OUT
= 4.75V
I
LDO_OUT
= 10mA
f = 10kHz
40
dB
Output-Voltage Noise
20Hz to 20kHz, C
LDO_OUT
= 2 x 1µF,
I
LDO_OUT
= 120mA
130
µV
RMS
DIGITAL INPUTS (
SPKR_EN, HP_EN, LDO_EN, BEEP)
Input-Voltage High
V
INH
2
V
Input-Voltage Low
V
INL
0.4
V
Input Bias Current
-1
+1
µA
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF, C1 = C2 = 1µF. R
L
=
∞, unless other-
wise specified. R
IN1
= 20k
Ω (A
VSPKR
= 12dB), R
IN2
= 40.2k
Ω (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)