Owner manual

MAX9712
500mW, Low EMI, Filterless,
Class D Audio Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= SHDN = 3.3V, GND = PGND = 0V, SYNC = GND (FFM), R
L
= 8Ω, R
L
connected between OUT+ and OUT-, T
A
=
T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 6Ω, L = 47µH.
For R
L
= 8Ω, L = 68µH. For R
L
= 16Ω, L = 136µH.
Note 3: PSRR is specified with the amplifier inputs connected to GND through C
IN
.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYNC = GND 980 1100 1220
SYNC = float 1280 1450 1620
Oscillator Frequency f
OSC
SYNC = V
DD
(SSM mode)
1220
±120
kHz
SYNC Frequency Lock Range 800 2000 kHz
Efficiency η P
OUT
= 300mW, f
IN
= 1kHz 85 %
DIGITAL INPUTS (SHDN, SYNC)
V
IH
2
Input Thresholds
V
IL
0.8
V
SHDN Input Leakage Current ±1µA
SYNC Input Current ±5µA
Typical Operating Characteristics
(V
DD
= 3.3V, V
SYNC
= GND, T
A
= +25°C, unless otherwise noted.)
0.001
10 100k10k100 1k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
0.1
0.01
MAX9712 TOC01
FREQUENCY (Hz)
THD+N (%)
V
DD
= +5V
R
L
= 8Ω
P
OUT
= 300mW
P
OUT
= 125mW
0.001
10 100k10k100 1k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
0.1
0.01
MAX9712 TOC02
FREQUENCY (Hz)
THD+N (%)
V
DD
= +3.3V
R
L
= 8Ω
P
OUT
= 300mW
P
OUT
= 125mW
0.001
10 100k10k100 1k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
0.1
0.01
MAX9712 TOC03
FREQUENCY (Hz)
THD+N (%)
V
DD
= +3.3V
R
L
= 8Ω
P
OUT
= 125mW
SSM MODE
FFM MODE