Datasheet

Typical Operating Characteristics
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. R
L
= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
6 _______________________________________________________________________________________
Note 3: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 4: AVDD and PVDD must be tied together. If LDO is enabled, set AVDD and PVDD as specified in the Line Regulation row of
the
Electrical Characteristics table.
Note 5: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 3Ω, L = 22µH.
For R
L
= 4Ω, L = 33µH. For R
L
= 8Ω, L = 68µH.
Note 6: Specified at T
A
= +25°C with an 8Ω + 68µH load connected across BTL output for speaker amplifier. Specified at T
A
= +25°C
with a 32Ω resistive load connected between HPR, HPL and GND for headphone amplifier. Speaker and headphone mode
transitions are controlled by SPKR_EN and HP_EN inputs, respectively.
Note 7: Amplifier Inputs AC-coupled to GND.
Note 8: Guaranteed by ATE characterization; limits are not production tested.
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9792 SPEAKER MODE)
MAX9791 toc01
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-10
0
-100
0.01 100
R
L
= 3
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9791 SPEAKER MODE)
MAX9791 toc02
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-10
0
-100
0.01 100
R
L
= 4
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9791 SPEAKER MODE)
MAX9791 toc03
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-10
0
-100
0.01 100
R
L
= 8
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9792 SPEAKER MODE)
MAX9791 toc04
OUTPUT POWER (W)
THD+N (%)
1.0 2.0 3.0
0.01
0.1
1
10
100
0.001
0 4.00.5 1.5 2.5 3.5
R
L
= 3
Ω
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9791 SPEAKER MODE)
MAX9791 toc05
OUTPUT POWER (W)
THD+N (%)
2.01.51.0
0.01
0.1
1
10
100
0.001
0 3.02.50.5
R
L
= 4
Ω
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9791 SPEAKER MODE)
MAX9791 toc06
OUTPUT POWER (W)
THD+N (%)
0.5 1.0
0.01
0.1
1
10
100
0.001
02.01.5
R
L
= 8
Ω
f = 6kHz
f = 1kHz
f = 100Hz
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF (C
LDO
= 4µF for 1.8V LDO option),
C1 = C2 = 1µF. R
L
= ∞, unless otherwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (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)
SPEAKER