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參數(shù)資料
| 型號： | MAX9710ETP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/13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(fù)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(diǎn)： | 消除爆音，靜音，關(guān)機(jī)，熱保護(hù) |
| 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) |
Detailed Description
The MAX9710/MAX9711 are 3W BTL speaker ampli-
fiers. The MAX9710 is a stereo speaker amplifier, while
the MAX9711 is a mono speaker amplifier. Both
devices feature a low-power shutdown mode, MUTE
mode, and comprehensive click-and-pop suppression.
These devices consist of high output-current op amps
configured as BTL amplifiers (see
Functional
Diagrams). The device gain is set by RF and RIN.
BIAS
These devices operate from a single 5V supply and
feature an internally generated, power-supply-indepen-
dent, common-mode bias voltage of 2.5V referenced to
ground. BIAS provides both click-and-pop suppression
and sets the DC bias level for the audio outputs. BIAS
is internally connected to the noninverting input of each
speaker amplifier (see
Functional Diagrams). Choose
the value of the bypass capacitor as described in the
BIAS Capacitor section. No external load should be
applied to BIAS. Any load lowers the BIAS voltage,
affecting the overall performance of the device.
Shutdown
The MAX9710/MAX9711 feature a 0.5A low-power shut-
down mode that reduces quiescent current consump-
tion. Pulling
SHDN low disables the device’s bias
circuitry, the amplifier outputs are actively pulled low,
and BIAS is driven to GND. Connect
SHDN to VDD for
normal operation.
MUTE
Both devices feature a clickless/popless MUTE mode.
When the device is muted, the input disconnects from
the amplifier. MUTE only affects the power amplifiers
and does not shut down the device. Drive MUTE high to
mute the device. Drive MUTE low for normal operation.
Click-and-Pop Suppression
The MAX9710/MAX9711 feature Maxim’s comprehen-
sive click-and-pop suppression. During startup, the
common-mode bias voltage of the amplifiers slowly
ramps to the DC bias point using an S-shaped wave-
form. When entering shutdown, the amplifier outputs are
actively driven low simultaneously. This scheme mini-
mizes the energy present in the audio band.
For optimum click-and-pop suppression, choose:
RIN x CIN < RBIAS x CBIAS
where RBIAS = 50kΩ.
Applications Information
BTL Amplifier
The MAX9710/MAX9711 are designed to drive a load
differentially, a configuration referred to as BTL. The
BTL configuration (Figure 1) offers advantages over the
single-ended configuration, where one side of the load
is connected to ground. Driving the load differentially
doubles the output voltage compared to a single-
ended amplifier under similar conditions. Thus, the dif-
ferential gain of the device is twice the closed-loop gain
of the input amplifier. The effective gain is given by:
Substituting 2 x VOUT(P-P) for VOUT(P-P) into the follow-
ing equations yields four times the output power due to
doubling of the output voltage:
Since the differential outputs are biased at midsupply,
there is no net DC voltage across the load. This elimi-
nates the need for DC-blocking capacitors required for
single-ended amplifiers. These capacitors can be
large, expensive, consume board space, and degrade
low-frequency performance.
P
V
R
OUT
RMS
L
=
2
V
RMS
OUT P P
=
()
22
A
R
VD
F
IN
=×
2
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
_______________________________________________________________________________________
7
+1
VOUT(P-P)
2 x VOUT(P-P)
VOUT(P-P)
-1
Figure 1. Bridge-Tied Load Configuration
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