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參數(shù)資料
| 型號： | MAX9710ETP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 3W STER 20TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | AB 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 3W x 2 @ 3 歐姆 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 特點： | 消除爆音，靜音，關(guān)機，熱保護 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 20-TQFN-EP（5x5） |
| 封裝/外殼： | 20-WQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
The capacitive nature of the piezoelectric speaker may
cause the MAX9711 to become unstable. A simple induc-
tor/resistor network in series with the speaker isolates the
speaker capacitance from the driver and ensures that the
device output sees a resistive load of about 10
Ω at high
frequency, thereby maintaining stability (Figure 3).
Layout and Grounding
Good PC board layout is essential for optimizing perfor-
mance. Use large traces for the power-supply inputs and
amplifier outputs to minimize losses due to parasitic
trace resistance and route heat away from the device.
Good grounding improves audio performance,
minimizes crosstalk between channels, and prevents any
digital switching noise from coupling into the audio
signal.
The MAX9710/MAX9711 thin QFN package features an
exposed thermal pad on the underside. This pad low-
ers the thermal resistance of the package by providing
a direct-heat conduction path from the die to the print-
ed circuit board. Connect the exposed pad to the
ground plane using multiple vias, if required. For opti-
mum performance, connect to the ground planes as
shown in Figure 4.
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
_______________________________________________________________________________________
9
TOTAL HARMONIC DISTORTI0N PLUS NOISE
vs. FREQUENCY
FREQUENCY (Hz)
THD+N
(%)
10
1
0.1
0.01
0.1
1
10
0.001
0.01
100
VOUT = 8VP-P
Figure 2. MAX9711 Piezoelectric Speaker Driver THD+N vs.
Frequency
MAX9711
IN
OUT+
OUT-
2
4
12
*PIEZOELECTRIC
SPEAKER.
*
AUDIO
INPUT
1
μF
15k
Ω
15k
Ω
10
Ω
100
μH
Figure 3. Isolation Network for Driving a Piezoelectric Speaker
MAX9710
PGND
PVDD
AUDIO SIGNAL
GND
VDD
5V
FOR OPTIMUM PERFORMANCE,
AUDIO GND SHOULD HAVE A
STAR CONNECTION TO THE HIGH
CURRENT, AMPLIFIER PGND AT
A SINGLE POINT, PIN 6.
Figure 4. MAX9710 Audio Ground Connection
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