Rainbow Electronics MAX9792 - Manual (Page 6)

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: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L = 3
Ω, L = 22µH.
For R
L
= 4 Ω, L = 33µH. For R
L
= 8 Ω, L = 68µH.
Note 5: Specified at T
A
= +25°C with an 8 Ω + 68µH load connected across BTL output for speaker amplifier. Specified at T
A
= +25°C
with a 32
Ω 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 6: Amplifier Inputs AC-coupled to GND.
Note 7: 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 4.0 0.5 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 (%)
2.0 1.5 1.0
0.01
0.1
1
10
100
0.001
0 3.0 2.5 0.5
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
0 2.0 1.5
R L = 8 Ω
f = 6kHz
f = 1kHz
f = 100Hz
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
= 20k Ω (A
VSPKR
= 12dB), R
IN2
= 40.2k Ω (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.)
SPEAKER
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)