Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(PV
DD
= V
DD
= +20V, PGND = GND = 0V, C
SS
= 0.47µF, C
REG
= 0.01µF, C1 = 0.1µF, C2 = 1µF, R
LOAD
= ∞, MONO = low (stereo
mode),
SHDN
=
MUTE
= high, G1 = low, G2 = high (A
V
= 22dB), FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R
L
) are
connected between OUT_+ and OUT_-, unless otherwise stated. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Shutdown Current
Shutdown to Full Operation
Mute to Full Operation
SYMBOL
V
DD
I
SHDN
t
SON
t
MUTE
G1 = 0, G2 = 1
Input Impedance
R
IN
G1 = 1, G2 = 1
G1 = 1, G2 = 0
G1 = 0, G2 = 0
Output Pulldown Resistance
Output Offset Voltage
V
OS
SHDN
= GND
AC-coupled input, measured between
OUT_+ and OUT_-
PV
DD
= 10V to 22V
Power-Supply Rejection Ratio
PSRR
200mV
P-P
ripple
(Note 2)
DC, input referred
f = 20Hz to 20kHz, input referred
One power switch
FS1
0
Switching Frequency
f
SW
1
1
0
Oscillator Spread Bandwidth
SYNCIN Lock Range
Equal to f
SW
x 4
FS2
0
1 (SSM)
0
1
600
180
200
200
160
250
±2
1200
%
kHz
220
kHz
f
RIPPLE
= 1kHz
f
RIPPLE
= 20kHz
49
67
50
40
25
12
SHDN
= low
CONDITIONS
Inferred from PSRR test
MIN
10
0.1
100
100
85
63
43
21
600
3
90
90
52
70
60
0.3
0.6
dB
Ω
dB
±40
125
90
60
30
kΩ
mV
kΩ
TYP
MAX
22
1
UNITS
V
µA
ms
ms
Common-Mode Rejection Ratio
Switch On-Resistance
CMRR
R
DS
FS1 = FS2 = high (SSM)
www.maximintegrated.com
Maxim Integrated │
2
MAX9709
25W/50W, Filterless, Spread-Spectrum,
Stereo/Mono, Class D Amplifier
Electrical Characteristics (continued)
(PV
DD
= V
DD
= +20V, PGND = GND = 0V, C
SS
= 0.47µF, C
REG
= 0.01µF, C1 = 0.1µF, C2 = 1µF, R
LOAD
= ∞, MONO = low (stereo
mode),
SHDN
=
MUTE
= high, G1 = low, G2 = high (A
V
= 22dB), FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R
L
) are
connected between OUT_+ and OUT_-, unless otherwise stated. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
G1 = 0, G2 = 1
Gain
A
V
G1 = 1, G2 = 1
G1 = 1, G2 = 0
G1 = 0, G2 = 0
TH2
0
0
0
TEMP
Flag Threshold
T
FLAG
0
1
1
1
1
TEMP
Flag Accuracy
TEMP
Flag Hysteresis
STEREO MODE (R
LOAD
= 8Ω, Note 3)
Quiescent Current
MUTE
= 1, R
LOAD
= ∞
MUTE
= 0
P
VDD
= 20V
Output Power
P
OUT
f = 1kHz, THD =
10%, T
A
= +25°C
P
VDD
= 22V
P
VDD
= 12V,
R
LOAD
= 4Ω
25
29
15
0.1
91
96
87
0.2
%
dB
%
%
W
20
6.5
33
13
mA
TH1
0
0
1
1
0
0
1
1
TH0
0
1
0
1
0
1
0
1
±6
2
°C
°C
80
90
100
110
120
129
139
°C
MIN
21.6
24.9
29.2
35.9
TYP
22.0
25.0
29.5
36.0
MAX
22.3
25.6
29.9
36.6
dB
UNITS
From +80°C to +140°C
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Efficiency
Left-Right Channel Gain
Matching
THD+N
SNR
η
f = 1kHz, BW = 22Hz to 22kHz,
P
OUT
= 12W
P
OUT
= 10W
22Hz to 22kHz
A-weighted
P
OUT
= 25W + 25W, f = 1kHz
R
LOAD
= ∞
www.maximintegrated.com
Maxim Integrated │ 3
MAX9709
25W/50W, Filterless, Spread-Spectrum,
Stereo/Mono, Class D Amplifier
Electrical Characteristics (continued)
(PV
DD
= V
DD
= +20V, PGND = GND = 0V, C
SS
= 0.47µF, C
REG
= 0.01µF, C1 = 0.1µF, C2 = 1µF, R
LOAD
= ∞, MONO = low (stereo
mode),
SHDN
=
MUTE
= high, G1 = low, G2 = high (A
V
= 22dB), FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R
L
) are
connected between OUT_+ and OUT_-, unless otherwise stated. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Output Short-Circuit Current
Threshold
Click-and-Pop Level
SYMBOL
I
SC
K
CP
R
LOAD
= 0Ω
Peak voltage, 32
samples/second,
A-weighted (Notes 2, 5)
MUTE
= 1, R
LOAD
= ∞
MUTE
= 0
P
OUT
THD+N
SNR
η
I
SC
K
CP
f = 1kHz, THD = 10%
R
LOAD
= 8Ω
R
LOAD
= 4Ω
Into shutdown
Out of shutdown
CONDITIONS
MIN
TYP
3
-63
-55
20
6.5
25
50
0.09
91
95
86
6
Into shutdown
Out of shutdown
-60
-63
1
2.5
0.8
I
SINK
= 3mA
V
PULLUP
= 5.5V
0.2
0.4
MAX
UNITS
A
dBV
MONO MODE (R
LOAD
= 4Ω, MONO =
HIGH)
(Note 6)
Quiescent Current
Output Power
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Efficiency
Output Short-Circuit Current
Threshold
Click-and-Pop Level
mA
W
%
dB
%
A
dBV
f = 1kHz, BW = 22Hz to 22kHz,
P
OUT
= 22W
P
OUT
= 10W
P
OUT
= 54W, f = 1kHz
R
LOAD
= 0Ω
Peak voltage, 32
samples/second,
A-weighted (Notes 2, 5)
0 to 12V
20Hz to 20kHz
A-weighted
DIGITAL INPUTS (SHDN,
MUTE,
G1, G2, FS1, FS2, TH0, TH1, TH2, SYNCIN, MONO)
Logic-Input Current
Logic-Input High Voltage
Logic-Input Low Voltage
Open-Drain Output Low Voltage
Leakage Current
Note
Note
Note
Note
Note
1:
2:
3:
4:
5:
I
IN
V
IH
V
IL
V
OL
I
LEAK
µA
V
V
V
µA
OPEN-DRAIN OUTPUTS (TEMP,
SYNCOUT)
All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Inputs AC-coupled to GND.
Testing performed with an 8Ω resistive load in series with a 68µH inductive load across the BTL outputs.
Minimum output power is guaranteed by pulse testing.
Testing performed with an 8Ω resistive load in series with a 68µH inductive load connected across BTL outputs. Mode tran-
sitions are controlled by
SHDN.
Note 6:
Testing performed with a 4Ω resistive load in series with a 33µH inductive load across the BTL outputs.
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