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MAX9718DEUB Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MAX9718DEUB
Description  Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX9718DEUB Datasheet(HTML) 10 Page - Maxim Integrated Products

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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
——
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 Noninverting Input
EP
EP
EP
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
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 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
Ω 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 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
P
V
R
OUT
RMS
L
=
2
V
V
RMS
OUT P P
=
()
22
A
R
R
VD
F
IN
2
SHDM
SHDN
OPERATIONAL MODE
0
0
Shutdown
0
1
Normal operation
1
0
Normal operation
1
1
Shutdown
Table 1. Shutdown Mode Selection
(MAX9718 Only)


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