Electrical characteristics (continued) – Rainbow Electronics MAX9792 User Manual
Page 4
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Class D Switching Frequency
f
SPK
948
1158
kHz
Spread-Spectrum Bandwidth
±15
kHz
Efficiency
η
P
OUT
= 1.5W, f
IN
= 1kHz, R
L
= 8
Ω (Note 4)
83
%
HEADPHONE AMPLIFIER
R
L
= 16
Ω
100
Output Power
P
OUT
THD+N = 1%,
f = 1kHz,
T
A
= +25
°C
R
L
= 32
Ω
180
mW
R
L
= 32
Ω, f
IN
= 6kHz, 20kHz AES17,
V
IN
= -3dBFS = 212mV
RMS
-78
R
L
= 10k
Ω, f
IN
= 6kHz, 20kHz AES17,
V
IN
= -3dBFS = 500mV
RMS
-87
dBFS
R
L
= 32
Ω, P
OUT
= 100mW, f = 1kHz
0.006
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16
Ω, P
OUT
= 75mW, f = 1kHz
0.014
%
V
HPVDD
= 2.7V to 5.5V, T
A
= +25
°C
70
107
f = 1kHz, V
RIPPLE
= 200mV
P-P
91
Power-Supply Rejection Ratio
PSRR
f = 10kHz, V
RIPPLE
= 200mV
P-P
80
dB
Feedback Impedance
R
FHP
38.2
40.2
42.2
k
Ω
Gain
A
V
R
IN2
= 40.2k
Ω
0
dB
Output Offset Voltage
V
OS
T
A
= +25
°C
±0.3
±3
mV
Into shutdown
-81
Click-and-Pop Level
K
CP
R
L
= 32
Ω,
peak voltage,
A-weighted, 32 samples
per second (Notes 5, 6)
Out of
shutdown
-72.5
dBV
A-weighted
102
Signal-to-Noise Ratio
SNR
R
L
= 32
Ω, P
OUT
= 40mW,
f
IN
= 1kHz
20Hz to 20kHz
94
dB
Noise
V
N
A-weighted
8
µV
RMS
Maximum Capacitive Load Drive
C
L
No sustained oscillations
100
pF
R
L
= 32
Ω, V
IN
=
-20dBFS = 30mV
RMS
82
L to R, R to L, f
IN
= 1kHz, COM
and SENSE
connected
R
L
= 10k
Ω, V
IN
=
-20dBFS = 0.7mV
RMS
89
R
L
= 32
Ω, V
IN
=
-20dBFS = 30mV
RMS
64
L to R, R to L, f
IN
= 15kHz, COM
and SENSE
connected
R
L
= 10k
Ω, V
IN
=
-20dBFS = 70.7mV
RMS
70
Crosstalk
SPKR to HP, R
LSPKR
= 8
Ω, P
SPKR
= 1W,
R
LHP
= 32
Ω, f
IN
= 1Hz
80
dB
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)