MAX9718AEUB ,Low-Cost, Mono/Stereo,1.4W Differential Audio Power AmplifiersFeaturesThe MAX9718/MAX9719 differential input audio power 2.7V to 5.5V Single-Supply Operationamp ..
MAX9718DETB+T ,Low-Cost, Mono/Stereo, 1.4W Differential Audio Power AmplifiersFeaturesThe MAX9718/MAX9719 differential input audio power♦ 2.7V to 5.5V Single-Supply Operationamp ..
MAX9718EEBL+TG45 ,Low-Cost, Mono/Stereo, 1.4W Differential Audio Power AmplifiersMAX9718/MAX971919-3050; Rev 7; 4/10Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers
MAX9718HEBL+T ,Low-Cost, Mono/Stereo, 1.4W Differential Audio Power AmplifiersELECTRICAL CHARACTERISTICS—5V Supply (continued)(V = 5V, GND = 0, SHDN/SHDN = V (MAX9718/MAX9719), ..
MAX971CSA ,Ultra-Low-Power, Open-Drain, Single/Dual-Supply ComparatorsFeaturesThe MAX971–MAX974 and MAX981–MAX984 single/' µMAX Package—Smallest 8-Pin SOdual/quad low-vo ..
MAX971CSA ,Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparatorsapplications, thesedevices operate from a single +2.5V to +11V supply (or' Internal 1.182V ±1% Band ..
MB89193PF ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12512-7EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89190/1 ..
MB89475 ,F2MC-8L/Low Power/Low Voltage Microcontrollersapplications forconsumer product.2* : F MC stands for FUJITSU Flexible Microcontroller.n
MB89535A ,F2MC-8L/Low Power/Low Voltage MicrocontrollersFEATURES• Wide range of package options• Two types of QFP packages (1 mm pitch, 0.65 mm pitch) • LQ ..
MB89535A ,F2MC-8L/Low Power/Low Voltage MicrocontrollersFUJITSU SEMICONDUCTORDS07-12547-4EDATA SHEET8-bit Original Microcontroller CMOS2F MC-8L MB89530A Se ..
MB89537A , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series
MB89537A , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series
MAX9718AETB-MAX9718AEUB
Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers
General DescriptionThe MAX9718/MAX9719 differential input audio power
amplifiers are ideal for portable audio devices with
internal speakers. The differential input structure
improves noise rejection and provides common-mode
rejection. A bridge-tied load (BTL) architecture mini-
mizes external component count, while providing high-
quality, power audio amplification. The MAX9718 is a
single-channel amplifier while the MAX9719 is a dual-
channel amplifier for stereo systems. Both devices
deliver 1.4W continuous average power per channel to
a 4Ωload with less than 1% THD+N while operating
from a single +5V supply. The devices are available as
adjustable gain amplifiers or with internally fixed gains
of 0dB, 3dB, and 6dB to reduce component count.
A shutdown input disables the bias generator and
amplifiers and reduces quiescent current consumption
to less than 100nA. The MAX9718 shutdown input can
be set as active high or active low. These devices fea-
ture Maxim’s comprehensive click-and-pop suppres-
sion circuitry that reduces audible clicks and pops
during startup and shutdown.
The MAX9718 is pin compatible with the LM4895,
and is available in 9-bump UCSP™, 10-pin TDFN, and
10-pin µMAX packages. The MAX9719 is available in
16-pin TQFN, 16-pin TSSOP, and 16-bump UCSP pack-
ages. Both devices operate over the -40°C to +85°C
extended temperature range.
ApplicationsMobile Phones
PDAs
Portable Devices
Features2.7V to 5.5V Single-Supply OperationVery High -93dB PSRR at 217Hz1.4W into 4Ωat 1% THD+N (per Channel)Differential InputInternal Fixed Gain to Reduce Component CountAdjustable Gain Option (MAX9718A/MAX9719A)100nA Low-Power Shutdown ModeNo Audible Clicks or Pops at Power-Up/DownImproved Performance Pin-Compatible Upgrade
to LM4895 (MAX9718D)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
Ordering Information
Simplified Block Diagram19-3050; Rev 0; 10/03
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.UCSP is a trademark of Maxim Integrated Products, Inc.
*Future product—contact factory for availability.
**EP = Exposed paddle.
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—5V Supply(VCC= 5V, GND = 0, SHDN/SHDN= VCC(MAX9718/MAX9719), SHDM = GND (MAX9718), RIN= RF= 10kΩ(MAX971_A), = +25°C. CBIAS= 0.1µF, no load. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCCto GND)..................................-0.3V to +6V
Any Other Pin to GND ...............................-0.3V to (VCC+ 0.3V)
IN_, BIAS, SHDM, SHDN, SHDNContinuous Current........20mA
OUT_ Short-Circuit Duration to GND or VCC.............Continuous
Continuous Power Dissipation (TA= +70°C)
9-Bump UCSP (derate 5.2mW/°C above +70°C)..........412mW
10-Pin TDFN (derate 24.4mW/°C above +70°C)........1951mW
10-Pin µMAX (derate 10.3mW/°C above +70°C)..........825mW
16-Bump UCSP (derate 8.2mW/°C above +70°C).......659mW
16-Pin TQFN (derate 16.9mW/°C above +70°C)........1349mW
16-Pin TSSOP (derate 21.3mW/°C above +70°C)......1702mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+235°C
Lead Temperature (soldering, 10s).................................+300°C
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
ELECTRICAL CHARACTERISTICS—5V Supply (continued)(VCC= 5V, GND = 0, SHDN/SHDN= VCC(MAX9718/MAX9719), SHDM = GND (MAX9718), RIN= RF= 10kΩ(MAX971_A), = +25°C. CBIAS= 0.1µF, no load. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
ELECTRICAL CHARACTERISTICS—3V Supply(VCC= 3V, GND = 0, SHDN/SHDN= VCC(MAX9718/MAX9719), SHDM = GND (MAX9718), RIN= RF= 10kΩ(MAX971_A),
Typical Operating Characteristics(VCC= 5V, CBIAS= 0.1µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
design, not production tested.
Note 2:Quiescent power-supply current is specified and tested with no load. Quiescent power-supply current depends on the offset
voltage when a practical load is connected to the amplifier. Guaranteed by design.
Note 3:Common-mode bias voltage is the voltage on BIAS and is nominally VCC/2.
Note 4:Output power is specified by a combination of a functional output current test and characterization analysis.
Note 5:Measurement bandwidth for THD+N is 22Hz to 22kHz.
Note 6:Peak voltage measured at power-on, power-off, into or out of SHDN. Bandwidth defined by A-weighted filters, inputs at AC
GND. VCCrise and fall times greater than or equal to 1ms.
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
ELECTRICAL CHARACTERISTICS—3V Supply (continued)(VCC= 3V, GND = 0, SHDN/SHDN= VCC(MAX9718/MAX9719), SHDM = GND (MAX9718), RIN= RF= 10kΩ(MAX971_A), = +25°C. CBIAS= 0.1µF, no load. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCYMAX9718 toc04
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCYMAX9718 toc05
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCYMAX9718 toc06
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCYMAX9718 toc07
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCYMAX9718 toc08
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWERMAX9718 toc09
OUTPUT POWER (W)
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
MAX9718 toc10
OUTPUT POWER (W)
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
MAX9718 toc11
OUTPUT POWER (W)
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
MAX9718 toc12
OUTPUT POWER (W)
THD+N (%)
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWERMAX9718 toc13
OUTPUT POWER (mW)
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
MAX9718 toc14
OUTPUT POWER (mW)
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
MAX9718 toc15
OUTPUT POWER (mW)
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
MAX9718 toc16
OUTPUT POWER (mW)
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. COMMON-MODE VOLTAGE
MAX9718 toc17
COMMON-MODE VOLTAGE (VRMS)
THD+N (%)452
TOTAL HARMONIC DISTORTION + NOISE
vs. COMMON-MODE VOLTAGE
MAX9718 toc18
COMMON-MODE VOLTAGE (VRMS)
THD+N (%)
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9718 toc19
SUPPLY VOLTAGE (V)
OUTPUT POWER
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9718 toc20
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9718 toc21
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
OUTPUT POWER
vs. LOAD RESISTANCEMAX9718 toc22
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc23
OUTPUT POWER (W)
POWER DISSIPATION (W)
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc24
OUTPUT POWER (W)
POWER DISSIPATION (W)
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc25
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc26
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
OUTPUT NOISE
vs. FREQUENCY
MAX9718 toc27
FREQUENCY (Hz)
OUTPUT NOISE (dB)
10k1k100
-150100k
GAIN AND PHASE
vs. FREQUENCYMAX9718 toc28
FREQUENCY (Hz)
GAIN/PHASE (
/dB)
10k1k100
-150100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYMAX9718 toc29
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-100100k
COMMON-MODE REJECTION RATIO
vs. FREQUENCYMAX9718 toc30
FREQUENCY (Hz)
CMRR (dB)
10k1k100
-100100k
Typical Operating Characteristics (continued)(VCC= 5V, CBIAS= 0.1µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
Typical Operating Characteristics (continued)(VCC= 5V, CBIAS= 0.1µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
SUPPLY CURRENT
vs. TEMPERATUREMAX9718 toc37
TEMPERATURE (°C)
SUPPLY CURRENT (mA)3510-15
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX9718 toc38
TEMPERATURE (°C)
SHUTDOWN CURRENT (3510-15
TURN-ON TIME
vs. DC BIAS BYPASS CAPACITOR
MAX9718 toc39
CBIAS (µF)
TURN-ON TIME (ms)
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
Detailed DescriptionThe 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.
BIASThese 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 ModeThe 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 Table1). The MAX9719 features
an active-low shutdown input, SHDN.
Click-and-Pop SuppressionThe 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 100kΩbetween both
outputs. This scheme minimizes the energy present in
the audio band.
Applications Information
BTL AmplifierThe MAX9718/MAX9719 are designed to drive a load
differentially, a configuration referred to as bridge-tied
load or BTL. The BTL configuration (Figure1) 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
single-ended amplifiers. These capacitors can be
large, expensive, consume board space, and degrade
low-frequency performance.
Power Dissipation and Heat SinkingUnder normal operating conditions, the MAX9718/
MAX9719 dissipate a significant amount of power. The
maximum power dissipation for each package is given
in the Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
where TJ(MAX)is +150°C, TAis the ambient tempera-
ture, and θJAis the reciprocal of the derating factor in
°C/W as specified in the Absolute Maximum Ratings
section. For example, θJAof the TQFN package is
+59.2°C/W.
The increase in power delivered by the BTL configura-
tion directly results in an increase in internal power dis-
sipation over the single-ended configuration. The
maximum internal power dissipation for a given VCC
and load is given by the following equation:
If the internal power dissipation for a given application
exceeds the maximum allowed for a given package,
reduce power dissipation by increasing the ground
plane heat-sinking capability and the size of the traces
to the device (see the Layout and Grounding section).
Other methods for reducing power dissipation are to
reduce VCC, increase load impedance, decrease ambi-
ent temperature, reduce gain, or reduce input signal.
Thermal-overload protection limits total power dissipa-
tion in the MAX9718/MAX9719. When the junction tem-
perature exceeds +160°C, the thermal protection
circuitry disables the amplifier output stage. The ampli-
fiers are enabled once the junction temperature cools
by 15°C. A pulsing output under continuous thermal
overload results as the device heats and cools.
For optimum power dissipation and heat sinking, con-
nect the exposed pad found on the µMAX, TDFN,
TQFN, and TSSOP packages to a large ground plane.
Fixed Differential GainThe MAX9718B, MAX9718C, MAX9718D, MAX9719B,
MAX9719C, and MAX9719D feature internally fixed
gains (see the Selector Guide). This simplifies design,
decreases required footprint size, and eliminates exter-
nal gain-setting resistors. Resistors R1 and R2 shown in
the Typical Operating Circuitare used to achieve each
fixed gain.
Adjustable Differential Gain
Gain-Setting ResistorsExternal feedback resistors set the gain of the
MAX9718A and MAX9719A. Resistors RFand RIN
(Figure2) set the gain of the amplifier as follows:
where AVis the desired voltage gain. Hence, an RINof
10kΩand an RFof 20kΩyields a gain of 2V/V, or 6dB.can be either fixed or variable, allowing the use of a
digitally controlled potentiometer to alter the gain under
software control.
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power AmplifiersFigure2. Setting the MAX9718A/MAX9719A Gain
MAX9718/MAX9719
Input FilterThe fully differential amplifier inputs can be biased at
voltages other than midsupply. The common-mode
feedback circuit adjusts for input bias, ensuring the
outputs are still biased at midsupply. Input capacitors
are not required as long as the common-mode input
voltage is within the specified range listed in the
Electrical Characteristicstable.
If input capacitors are used, input capacitor CIN, in
conjunction with RIN, forms a highpass filter that
removes the DC bias from an incoming signal. The AC-
coupling capacitor allows the amplifier to bias the sig-
nal to an optimum DC level. Assuming zero-source
impedance, the -3dB point of the highpass filter is
given by:
Setting f-3dBtoo high affects the low-frequency
response of the amplifier. Use capacitors with
dielectrics that have low-voltage coefficients, such as
tantalum or aluminum electrolytic. Capacitors with high-
voltage coefficients, such as ceramics, can increase
distortion at low frequencies.
BIAS CapacitorBIAS is the output of the internally generated VCC/2
bias voltage. The BIAS bypass capacitor, CBIAS,
improves PSRR and THD+N by reducing power supply
and other noise sources at the common-mode bias
node, and also generates the clickless/popless startup
DC bias waveform for the speaker amplifiers. Bypass
BIAS with a 0.1µF capacitor to GND. Larger values of
CBIAS(up to 1µF) improve PSRR, but slow down
tON/tOFFtimes. A 1µF CBIAScapacitor slows turn-on
and turn-off times by 10 and improves PSRR by 20dB
(at 1kHz). Do not connect external loads to BIAS.
Supply BypassingProper power-supply bypassing ensures low-noise,
low-distortion performance. Connect a 1µF ceramic
capacitor from VCCto GND. Add additional bulk
capacitance as required by the application. Locate the
bypass capacitor as close to the device as possible.
Layout and GroundingGood 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 MAX9718/MAX9719 TDFN, TQFN, TSSOP, and
µMAX packages feature exposed thermal pads on their
undersides. This pad lowers the thermal resistance of the
package by providing a direct-heat conduction path
from the die to the PC board. Connect the exposed pad
to the ground plane using multiple vias, if required.
UCSP Applications InformationFor the latest application details on UCSP construction,
dimensions, tape carrier information, PC board tech-
niques, bump-pad layout, and recommended reflow
temperature profile, as well as the latest information on
reliability testing results, refer to the Application Note:
UCSP—A Wafer-Level Chip-Scale Package available
on Maxim’s website at /ucsp.
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
