Datasheet

MAX9715
2.8W, Low-EMI, Stereo, Filterless Class D
Audio Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V, V
SHDN
= V
DD
, C
BIAS
= 1μF, speaker impedance = 8Ω in series with 68μH connected between
OUT_+ and OUT_-, GAIN = +10.5dB, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Spread-Spectrum Modulation ±120 kHz
Crosstalk
Channel-to-channel, f = 10kHz, P
OUT
= 1W,
left to right or right to left
72 dB
Into shutdown -64
Click-and-Pop Level K
CP
Peak voltage,
A-weighted,
32 samples per
second (Note 4)
Out of shutdown -46
dBV
Efficiency η
R
L
= 8Ω in series with 68μH, P
OUT
= 1W
per channel, f = 1kHz
86 %
DIGITAL INPUTS (GAIN and SHDN)
Input High Voltage V
IH
2.0 V
Input Low Voltage V
IL
0.8 V
SHDN ±1
Input Leakage Current I
LEAK
GAIN ±1.5
μA
Note 1: All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2: Speaker amplifier gain is defined as A
V
= (V
OUT_+
- V
OUT_-
) / V
IN
.
Note 3: Click-and-pop level testing performed with an 8Ω resistive load in series with 68μH inductive load connected across the
Class D BTL outputs. Mode transitions are controlled by the SHDN pin. Inputs AC-coupled to GND.
Note 4: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 4Ω, L = 33μH.
For R
L
= 8Ω, L = 68μH.
Typical Operating Characteristics
(V
DD
= 5.0V, C
VDD
= 3 x 0.1μF, C
BIAS
= 1μF, C
INL
= C
INR
= 1μF, A
V
= +10.5dB, T
A
= +25°C, unless otherwise noted.) (See the
Typical Operating Circuit/Functional Diagram )
10 1k 100k10k100
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9715toc01
FREQUENCY (Hz)
THD+N (%)
1
0.1
0.001
0.01
P
OUT
= 0.35W
P
OUT
= 2W
V
DD
= 5V
R
L
= 4
Ω
10 1k 100k10k100
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9715toc02
FREQUENCY (Hz)
THD+N (%)
1
0.1
0.001
0.01
P
OUT
= 0.5W
P
OUT
= 1.25W
V
DD
= 5V
R
L
= 8
Ω
100
0.001
01.00.5 2.0 3.0 4.03.5
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
0.01
0.1
1
10
MAX9715toc03
OUTPUT POWER (W)
THD+N (%)
1.5 2.5
f
IN
= 1kHz AND 20Hz
f
IN
= 10kHz
V
DD
= 5V
R
L
= 4Ω