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參數資料
| 型號： | MAX9718FEBL+TG45 |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 2/27頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 1.4W MONO 9UCSP |
| 標準包裝： | 2,500 |
| 類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數量： | 1.4W x 1 @ 4 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點： | 消除爆音，差分輸入，關閉，熱保護 |
| 安裝類型： | * |
| 供應商設備封裝： | * |
| 封裝/外殼： | * |
| 包裝： | * |
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MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
10
______________________________________________________________________________________
Pin Description (continued)
PIN
TDFN-EP/
MAX
UCSP
TQFN-EP
UCSP
TSSOP-EP
NAME
FUNCTION
—
10
B4
12
OUTL-
Left-Channel Bridge Amplifier Negative Output
—
12
D4
14
OUTR+
Right-Channel Bridge Amplifier Positive Output
—
15
D2
1
OUTR-
Right-Channel Bridge Amplifier Negative Output
—
16
D1
2
INR-
Right-Channel Inverting Input
——
—
EP
Exposed Pad. Connect EP to GND.
Detailed Description
The MAX9718/MAX9719 are 1.4W BTL speaker ampli-
fiers. The MAX9718 is a mono speaker amplifier, while
the MAX9719 is a stereo speaker amplifier. Both
devices feature a low-power shutdown mode and indus-
try-leading click-and-pop suppression. The MAX9718
features a two-input shutdown scheme to configure
shutdown for active high or active low. These devices
consist of high output-current audio amps configured as
BTL amplifiers (see the
Functional Diagrams). Both
adjustable and fixed gain (0dB, 3dB, 6dB) versions are
available.
BIAS
These devices operate from a single 2.7V to 5.5V sup-
ply and feature an internally generated, common-mode
bias voltage of VCC/2 referenced to ground. BIAS pro-
vides both click-and-pop suppression and sets the DC
bias level for the audio outputs. Choose the value of the
bypass capacitor as described in the
BIAS Capacitor
section. Do not connect external loads to BIAS as this
can affect the overall performance.
Shutdown Mode
The MAX9718/MAX9719 feature a 100nA low-power
shutdown mode that reduces quiescent current con-
sumption. Entering shutdown disables the device’s bias
circuitry, the amplifier outputs go high impedance, and
BIAS is driven to GND. The MAX9718 SHDM input con-
trols the polarity of SHDN. Drive SHDM high for an
active-high SHDN input. Drive SHDM low for an active-
low SHDN input (see Table 1). The MAX9719 features
an active-low shutdown input, SHDN.
Click-and-Pop Suppression
The MAX9718/MAX9719 feature Maxim’s industry-lead-
ing click-and-pop suppression circuitry. During startup,
the amplifier common-mode bias voltage ramps to the
DC bias point. When entering shutdown, the amplifier
outputs are high impedance to 100k
between both
outputs. This scheme minimizes the energy present in
the audio band.
Applications Information
BTL Amplifier
The MAX9718/MAX9719 are designed to drive a load
differentially, a configuration referred to as bridge-tied
load or 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.
Substituting 2 x VOUT(P-P) for VOUT(P-P) into the following
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
SHDM
SHDN
OPERATIONAL MODE
0
Shutdown
0
1
Normal operation
1
0
Normal operation
1
Shutdown
Table 1. Shutdown Mode Selection
(MAX9718 Only)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX9718FETB+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9718FETB+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9718GEBL+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9718GEBL+G47 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX9718GEBL+TG45 | 制造商:Maxim Integrated Products 功能描述:LOW-COST, MONO/STEREO, 1.4W DIFFERENTIAL AUDIO POWER AMPLIFI - Tape and Reel |
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