參數(shù)資料
型號(hào)： MAX9707ETX+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 8/25頁(yè)
文件大小： 0K
描述： IC AMP AUDIO 2.3W STER+1 36TQFN
標(biāo)準(zhǔn)包裝： 2,500
類(lèi)型： D 類(lèi)
輸出類(lèi)型： 2-通道（立體聲）帶超低音器
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： 2.3W x 3 @ 4 歐姆
電源電壓： 4.5 V ~ 5.5 V
特點(diǎn)： 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)閉
安裝類(lèi)型： 表面貼裝
供應(yīng)商設(shè)備封裝： 36-TQFN 裸露焊盤(pán)（6x6）
封裝/外殼： 36-WFQFN 裸露焊盤(pán)
包裝： 帶卷 (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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參數(shù)描述
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