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參數(shù)資料
| 型號： | MAX9718A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers |
| 中文描述： | 低成本，單聲道/立體聲，以1.4W差分音頻功率放大器 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大小： | 569K |
| 代理商： | MAX9718A |
M
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
10
______________________________________________________________________________________
Pin Description (continued)
PIN
MAX9718
MAX9719
TDFN/
μMAX
UCSP
TQFN
UCSP
TSSOP
NAME
FUNCTION
—
—
—
EP
—
—
—
—
12
15
16
EP
D4
D2
D1
—
14
1
2
EP
OUTR+
OUTR-
INR-
EP
Right-Channel Bridge Amplifier Positive Output
Right-Channel Bridge Amplifier Negative Output
Right-Channel Noninverting Input
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
industry-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 con-
figured 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 V
CC
/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.
Thus, the differential gain of the device is twice the
closed-loop gain of the input amplifier. The effective
gain is given by:
Substituting 2 x V
OUT(P-P)
for V
OUT(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
P
V
R
OUT
RMS
L
=
2
V
V
RMS
OUT P P
(
2 2
=
)
A
R
R
VD
F
IN
= ×
2
SHDM
0
0
1
1
SHDN
0
1
0
1
OPERATIONAL MODE
Shutdown
Normal operation
Normal operation
Shutdown
Table
1. Shutdown Mode Selection
(MAX9718 Only)
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PDF描述 |
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| MAX9718AEUB | Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers |
| MAX9718B | Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers |
| MAX9718BEUB | Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers |
| MAX9718C | Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers |
| MAX9718CETB | Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9718AEBL | 制造商:Maxim Integrated Products 功能描述:LOW-COST MONO/STEREO 1.4W DIFFERE - Rail/Tube |
| MAX9718AEBL+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 1.4W CLS-AB 9UCSP - Rail/Tube |
| MAX9718AEBL+T | 制造商:Maxim from Components Direct 功能描述:THE MAXIM MAX9718AEBL+T IS A CLASS AB PORTABLE SPEAKER AMPLI - Tape and Reel 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 1.4W CLS-AB 9UCSP - Tape and Reel 制造商:Maxim 功能描述:Maxim MAX9718AEBL+T, Audio Power Amplifier Class AB 1.4W Differential 2.7V-5.5V 9-bump USCP |
| MAX9718AEBL+TG45 | 功能描述:音頻放大器 Mono/Stereo 1.4W BTL Audio Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9718AEBL-T | 制造商:Maxim Integrated Products 功能描述:LOW-COST, MONO/STEREO, 1.4W DIFFERENTIAL AUDI - Tape and Reel |
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