MAX9746 查看數據表（PDF） - Maxim Integrated
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MAX9746 Datasheet PDF : 16 Pages
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1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD = SHDN = 3.3V, GND = PGND = 0V, SYNC = GND (FFM), RL = 8Ω, RL connected between OUT+ and OUT-, TA =
TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)
PARAMETER
SYNC Frequency Lock Range
Efficiency
DIGITAL INPUTS (SHDN, SYNC)
SHDN Input Threshold
SHDN Input Leakage Current
SYMBOL
CONDITIONS
η
POUT = 500mW, fIN = 1kHz
VIH
VIL
MIN TYP MAX UNITS
800
2000 kHz
94
%
1.4
V
0.4
±1
µA
SYNC Input Threshold
SYNC Input Current
VIH
External clock
VIL
1.4
0.4
Internal clock
SSM mode
FFM mode (1.1MHz)
1.9
Tie to
VDD
V
Tie to
0.4
GND
FFM mode (1.45MHz)
Float
±5
µA
ELECTRICAL CHARACTERISTICS
(VDD = PVDD = SHDN = 5V, GND = PGND = 0V, SYNC = GND (FFM), RL = 8Ω, RL connected between OUT+ and OUT-, TA = TMIN
to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Quiescent Current
IDD
5.2
mA
Shutdown Current
Common-Mode Rejection Ratio
ISHDN
CMRR
f = 1kHz, input referred
0.1
µA
72
dB
Power-Supply Rejection Ratio
PSRR
f = 217Hz
200mVP-P ripple f = 20kHz
72
dB
55
Output Power
POUT THD+N = 1% RL = 8Ω
1200
mW
Total Harmonic Distortion
Plus Noise
THD+N
f = 1kHz, either
FFM or SSM
RL = 8Ω, POUT = 125mW
0.1
%
Signal-to-Noise Ratio
SNR
VOUT =
3VRMS
BW = 22Hz to
22kHz
A-weighted
FFM
SSM
FFM
SSM
92.5
90.5
dB
95.5
93.5
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 RL = 8Ω, L = 68µH.
Note 3: PSRR is specified with the amplifier inputs connected to GND through CIN.
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