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参数资料
| 型号： | MAX9707ETX+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/25页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 2.3W STER+1 36TQFN |
| 标准包装： | 2,500 |
| 类型： | D 类 |
| 输出类型： | 2-通道（立体声）带超低音器 |
| 在某负载时最大输出功率 x 通道数量： | 2.3W x 3 @ 4 欧姆 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 特点： | 消除爆音，短路保护和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX9706/MAX9707
3-Channel, 2.3W, Filterless Class D Amplifiers
with Active Crossover
16
______________________________________________________________________________________
External Clock Mode
The SYNC_IN input allows the MAX9706/MAX9707 to
be synchronized to an external clock, or another Maxim
Class D amplifier. This creates a fully synchronous sys-
tem, minimizing clock intermodulation, and allocating
spectral components of the switching harmonics to
insensitive frequency bands. Applying a TTL clock sig-
nal between 1MHz and 1.5MHz to SYNC_IN synchro-
nizes the MAX9706/MAX9707. The period of the
SYNC_IN clock can be randomized, allowing the
MAX9706/MAX9707 to be synchronized to another
Maxim Class D amplifier operating in SSM mode.
SYNC_OUT allows several MAX9706/MAX9707s to be
cascaded. The synchronized output minimizes any
interference due to clock intermodulation caused by
the switching spread between single devices. The
modulation scheme remains the same when using
SYNC_OUT, and audio reproduction is not affected.
Leave SYNC_OUT floating if not used.
Filterless Modulation/Common-Mode Idle
The MAX9706/MAX9707 use Maxim’s unique modula-
tion scheme that eliminates the LC filter required by tra-
ditional Class D amplifiers, improving efficiency,
reducing component count, conserving board space
and system cost. Conventional Class D amplifiers out-
put a 50% duty-cycle square wave when no signal is
present. With no filter, the square wave appears across
the load as a DC voltage, resulting in finite load current,
increasing power consumption, especially when idling.
When no signal is present at the input of the
MAX9706/MAX9707, the outputs switch as shown in
Figure 4. Because the MAX9706/MAX9707 drive the
speaker differentially, the two outputs cancel each
other, resulting in no net idle-mode voltage across the
speaker, minimizing power consumption.
Efficiency
Efficiency loss of a Class D amplifier is due to the
switching operation of the output stage transistors. In a
Class D amplifier, the output transistors act as current-
steering switches and consume negligible additional
power. Any power loss associated with the Class D out-
put stage is mostly due to the I2R loss of the MOSFET
on-resistance, and quiescent current overhead.
The theoretical best efficiency of a Class AB linear
amplifier is 78%, however, that efficiency is only exhibit-
ed at peak output powers. Under normal operating lev-
els (typical music reproduction levels), efficiency falls
below 30%, whereas the MAX9706/MAX9707 still
exhibit >90% efficiencies under the same conditions
(Figure 5).
Signal Path Gain
The MAX9706/MAX9707 feature four selectable speak-
er gain and two headphone gain settings controlled by
two gain-control inputs GAIN1 and GAIN2 (see Table 2).
Note that the stereo headphone output is full band-
width, but the stereo speaker outputs are highpass fil-
tered by the crossover circuitry.
VIN_ = 0V
OUT_-
OUT_+
VOUT_+ - VOUT_- = 0V
Figure 4. Outputs with No Input Signal
1.0
0.6
0.4
0.2
0
1.2
OUTPUT POWER (W)
EFFICIENCY
(%)
10
20
30
40
50
60
70
80
90
100
0
VDD = 5V
fIN = 1kHz
RL = 8
Ω
MAX9706
POUT PER CHANNEL
CLASS AB
TOTAL POUT
0.8
Figure 5. Efficiency vs. Class AB Efficiency
Table 2. Speaker Gain
GAIN2
GAIN1
SPEAKER
GAIN (dB)
MAX9706 HEADPHONE
GAIN (dB)
0
+9
0
1
+10.5
0
1
0
+12
+3
1
+13.5
+3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9708ECB+D | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO/2CH STEREO 42W/21W CLS-D 64TQFP EP - Rail/Tube |
| MAX9708ECB+TD | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO/2CH STEREO 42W/21W CLS-D 64TQFP EP - Tape and Reel |
| MAX9708ETN | 制造商:Maxim Integrated Products 功能描述:20W/40W FILTERLESS, SPREAD-SPECTRUM, MONO/STE - Rail/Tube |
| MAX9708ETN/V+TD | 制造商:Maxim Integrated Products 功能描述:20W/40W FILTERLESS, SPREAD SPECTRUM, MONO/STEREO, CLASS D AM - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC AMP AUDIO PWR 42W STER 56TQFN 制造商:Maxim Integrated Products 功能描述:Filterless Class D Amp Mono/Stereo |
| MAX9708ETN+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO/2CH STEREO 42W/21W CLS-D 56TQFN EP - Rail/Tube |
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