參數資料
型號: MAX9709ETN+D
廠商: Maxim Integrated Products
文件頁數: 9/20頁
文件大小: 0K
描述: IC AMP AUDIO PWR 50W STER 56TQFN
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 37
類型: D 類
輸出類型: 1-通道(單聲道)或 2-通道(立體聲)
在某負載時最大輸出功率 x 通道數量: 50W x 1 @ 4 歐姆; 29W x 2 @ 8 歐姆
電源電壓: 10 V ~ 22 V
特點: 消除爆音,差分輸入,靜音,短路和熱保護,關機
安裝類型: 表面貼裝
供應商設備封裝: 56-TQFN-EP(8x8)
封裝/外殼: 56-WFQFN 裸露焊盤
包裝: 管件
產品目錄頁面: 1392 (CN2011-ZH PDF)
MAX9709
25W/50W, Filterless, Spread-Spectrum,
Stereo/Mono, Class D Amplifier
______________________________________________________________________________________
17
The circuit in Figure 6 uses inverting amplifiers for their
ease in biasing. Note the phase labeling at the outputs
has been reversed. The resistors should be 1% or better
in tolerance and the capacitors 5% tolerance or better.
Mismatch in the components can cause discrepancies
between the nominal transfer function and actual perfor-
mance. Also, the mismatch of the input resistors (R15,
R17, R19, and R21 in Figure 6) of the summing amplifier
and lowpass filter causes some high-frequency sound to
be sent to the subwoofer.
The circuit in Figure 6 drives a pair of MAX9709 devices
similar to the circuit in Figure 5. The inputs to the
MAX9709 still require AC-coupling to prevent compro-
mising the click-and-pop performance of the MAX9709.
The left and right drivers should be at an 8
Ω to 12Ω
impedance, whereas the subwoofer can be 4
Ω to 8Ω
depending on the desired output power, the available
power-supply voltage, and the sensitivity of the individ-
ual speakers in the system. The four gain settings of
the MAX9709 allow gain adjustments to match the sen-
sitivity of the speakers.
Figure 5. Multiple Amplifiers Implement a 2.1 Audio System
MAX9709
HIGHPASS
FILTER
8
Ω
FULL-
RANGE
SPEAKER
8
Ω
FULL-
RANGE
SPEAKER
4
Ω OR 8Ω
WOOFER
RIGHT
AUDIO
LEFT
AUDIO
HIGHPASS
FILTER
LOWPASS
FILTER
Σ
VDIGITAL
OUTR+
OUTR-
OUTL+
OUTL-
OUTR+
OUTR-
OUTL+
OUTL-
INR+
INR-
MONO
INL+
INL-
INR+
SYNCIN
SYNCOUT
INR-
MONO
INL+
INL-
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參數描述
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