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MAX9759ETE+T |MAX9759ETETMAXN/a2500avai3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio Amplifier


MAX9759ETE+T ,3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio AmplifierFeaturesThe MAX9759 mono Class D, audio power amplifier♦ 3.2W into 4Ω Load (THD+N = 10%)provides Cl ..
MAX975ESA ,Single/Dual / +3V/+5V Dual-Speed Comparators with Auto-StandbyApplicationsMAX975IN+Battery-Powered Systems LPRF ID TagsHIGH SPEEDOUTKeyless EntryENABLEThreshold ..
MAX975ESA+ ,Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standbyfeatures independently adjustable timeout periods foreach comparator using separate capacitors.♦ ♦ ..
MAX975ESA+ ,Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-StandbyApplicationsMAX975IN+Battery-Powered Systems LPRF ID TagsHIGH SPEEDOUTKeyless EntryENABLEThreshold ..
MAX975ESA+T ,Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-StandbyELECTRICAL CHARACTERISTICS(V = +2.7V to +5.25V, specifications are for high-speed mode, T = -40°C t ..
MAX975EUA ,Single/Dual / +3V/+5V Dual-Speed Comparators with Auto-Standbyapplications. The operatingHigh Speed with Auto-Standbymodes are as follows: high speed, high speed ..
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
MB89537AC , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series

MAX9759ETE+T
3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio Amplifier
General Description
The MAX9759 mono Class D, audio power amplifier
provides Class AB amplifier audio performance with the
benefits of Class D efficiency, eliminating the need for a
heatsink and extending battery life. The MAX9759 deliv-
ers up to 3.2W of continuous power into a 4Ωload while
offering greater than 90% efficiency. Maxim’s next-gen-
eration, low-EMI modulation scheme allows the amplifi-
er to operate without an external LC filter while still
meeting FCC EMI-radiated emission levels.
The MAX9759 offers two modulation schemes: a fixed-
frequency modulation (FFM) mode and a spread-spec-
trum modulation (SSM) mode. The SSM mode flattens
the wideband spectral components, reducing EMI-radi-
ated emissions due to the modulation frequency.
Furthermore, the MAX9759 oscillator can be synchro-
nized to an external clock through the SYNC input,
allowing the switching frequency to range from
1000kHz to 1600kHz. The SYNC input and SYNC_OUT
output of the MAX9759 allow multiple Maxim Class D
amplifiers to be cascaded and frequency locked, mini-
mizing interference due to clock intermodulation. The
MAX9759 utilizes fully differential input amplifiers, a full-
bridged output, comprehensive click-and-pop suppres-
sion, and features four selectable gain settings (6dB,
12dB, 18dB, 24dB).
The MAX9759 features high 81dB PSRR, low 0.02%
THD+N, and SNR in excess of 90dB. Short-circuit and
thermal-overload protection prevents damage to the
device during a fault condition. The MAX9759 operates
from a single 5V supply, consumes 8.4mA of supply
current, and is available in a 16-pin thin QFN package
(4mm x 4mm x 0.8mm). The MAX9759 is fully specified
over the extended -40°C to +85°C temperature range.
Applications
Cell Phones/PDAs
Notebook PCs
Portable DVD Players
Flat-Panel PC Monitors
LCD TVs
LCD Projectors
Features3.2W into 4ΩLoad (THD+N = 10%)Filterless Amplifier Passes FCC Radiated
Emissions Standards with 7.6cm of Cable92% EfficiencyHigh PSRR (81dB at 1kHz)Low 0.02% THD+NExternal Clock Synchronization for Multiple,
Cascaded Maxim Class D Amplifiers3.0V to 5.5V Single-Supply OperationPin-Selectable Gain (6dB, 12dB, 18dB, 24dB)Integrated Click-and-Pop SuppressionLow Quiescent Current (8.4mA)Low-Power Shutdown Mode (10µA)Mute FunctionShort-Circuit and Thermal-Overload ProtectionAvailable in Thermally Efficient Package
16-Pin TQFN (4mm x 4mm x 0.8mm)
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
MAX9759
DIFFERENTIAL
AUDIO INPUT
SYNC
INPUT
SYNC
OUTPUT
VDD
OSCILLATOR
MODULATOR
AND H-BRIDGE
MONO SPEAKER
OUTPUT
GAIN
CONTROL
MUTE
CONTROL
SHDN
CONTROL
SHDN
MUTE
Simplified Block Diagram
Ordering Information
19-3691; Rev 1; 10/05
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX9759ETE+-40°C to +85°C16 TQFN-EP*T1644-4
Pin Configurations appear at end of data sheet.
+Denotes lead-free package.
*EP = Exposed paddle.
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
ABSOLUTE MAXIMUM RATINGS
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.
VDDto GND..............................................................................6V
PVDDto PGND.........................................................................6V
GND to PGND.......................................................-0.3V to +0.3V
All Other Pins to GND.................................-0.3V to (VDD+ 0.3V)
Continuous Current Into/Out of PVDD/PGND/OUT+/OUT-....1.7A
Duration of OUT+ or OUT- Short Circuit to
VDD/GND/PVDD/PGND............................................Continuous
Duration of Short Circuit Between OUT+ and OUT-..Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin TQFN (derate 16.9mW/°C above +70°C).....1349.1mW
Junction Temperature......................................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ESD Protection (+IBM).........................................................±2kV
ELECTRICAL CHARACTERISTICS (VDD= 5.0V)
(VDD= PVDD= SHDN= MUTE= 5V, GND = PGND = 0V, SYNC = 0V (FFM). Gain = 12dB (G1 = 0, G2 = 1). Speaker load resistor
(RL) connected between OUT+ and OUT-, unless otherwise noted, RL= ∞, TA= TMINto TMAX, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GENERAL
Supply Voltage RangeVDDInferred from PSRR test3.05.5V
Quiescent CurrentIDDNo load8.412mA
Mute CurrentIMUTEV MUTE = 0V5.58mA
Shutdown CurrentIDD(SHDN)V SHDN = 0V0.110µA
Shutdown to Full OperationtSON40ms
Mute to Full OperationtMUTE40ms
Common-Mode Rejection RatioCMRRf = 1kHz, input referred, VIN = 200mVP-P67dB
Input DC Bias VoltageVCM1.31.51.7V
Gain = +24dB142026
Gain = +18dB253647
Gain = +12dB406080Input ResistanceRIN
Gain = +6dB6090120
G1 = 0, G2 = 0+22+24+26
G1 = 1, G2 = 0+16+18+20
G1 = 0, G2 = 1+10+12+14Voltage GainAV
G1 = 1, G2 = 1+4+6+8
Output Offset VoltageVOSTA = +25°C±10±50mV
VDD = 4.5V to 5.5V6290
fRIPPLE = 217Hz79
fRIPPLE = 1kHz81
Power-Supply Rejection Ratio
(Note 3)PSRR200mVP-P ripple
fRIPPLE = 20kHz70
MAX9759
3.2W, High Efficiency, Low-EMI, Filterless,
Class D Audio Amplifier
ELECTRICAL CHARACTERISTICS (VDD= 5.0V) (continued)
(VDD= PVDD= SHDN= MUTE= 5V, GND = PGND = 0V, SYNC = 0V (FFM). Gain = 12dB (G1 = 0, G2 = 1). Speaker load resistor
(RL) connected between OUT+ and OUT-, unless otherwise noted, RL= ∞, TA= TMINto TMAX, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
RL = 3Ω3.4
RL = 4Ω2.6THD+N = 1%
RL = 8Ω1.4
RL = 3Ω4.3
RL = 4Ω3.2
Output PowerPOUT
THD+N = 10%
RL = 8Ω1.8
RL = 3Ω0.08
RL = 4Ω0.05Total Harmonic Distortion Plus
NoiseTHD+N
fIN = 1kHz, either
FFM or SSM,
POUT = 1WRL = 8Ω0.02
FFM93BW = 22Hz to
22kHzSSM89
FFM96Signal-to-Noise RatioSNRPOUT = 1W,
RL = 8Ω
A-weightedSSM92
SYNC = GND (FFM mode)100011001200
SYNC = FLOAT (FFM mode)110215001837Oscillator FrequencyfOSC
SYNC = VDD (SSM mode)1200
±70
kHz
SYNC Frequency Lock RangeTTL-compatible clock input10001600kHz
Into shutdown-50
Click-and-Pop LevelKCP
Peak voltage,
A-weighted, 32 samples
per second (Notes 3, 4)Out of shutdown-57
dBV
EfficiencyηPOUT = 1W, fIN = 1kHz, RL = 8Ω in series
with 68µH92%
DIGITAL INPUTS (SHDN, MUTE, G1, G2, SYNC)
SYNC, G1, G2 Input Voltage HighVINHVDD x 0.9V
SYNC, G1, G2 Input Voltage LowVINLVDD x 0.1V
SHDN, MUTE Voltage HighVINH2V
SHDN, MUTE Voltage LowVINL0.8V
SYNC Input Resistance200kΩ
SYNC Input Current±35µA
SHDN, MUTE, G1, G2 Input
Current±1µA
SYNC Capacitance10pF
DIGITAL OUTPUTS (SYNC_OUT)
Output Voltage HighVOHIOH = 3mA2.4V
Output Voltage LowVOLIOL = 3mA0.4V
SYNC_OUT Capacitive DriveTTL-compatible clock output100pF
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
ELECTRICAL CHARACTERISTICS (VDD= 3.3V)
(VDD= PVDD= SHDN= MUTE= 3.3V, GND = PGND = 0V, SYNC = GND (FFM). Gain = 12dB (G1 = 0, G2 = 1). Speaker load resis-
tor (RL) connected between OUT+ and OUT-, unless otherwise noted. RL= ∞, TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Quiescent CurrentIDD6mA
Mute CurrentIMUTEV MUTE = 0V5A
Shutdown CurrentISHDNV SHDN = 0V0.1µA
Common-Mode Rejection RatioCMRRf = 1kHz, input referred67dB
VDD = 3.0V to 5.5V5072dB
fRIPPLE = 217Hz79
fRIPPLE = 1kHz81Power-Supply Rejection RatioPSRR200mVP-P ripple
fRIPPLE = 20kHz70
RL = 3Ω1.5
RL = 4Ω1.1THD+N = 1%
RL = 8Ω0.65
RL = 3Ω1.8
RL = 4Ω1.3
Output PowerPOUT
THD+N = 10%
RL = 8Ω0.78
RL = 3Ω0.06
RL = 4Ω0.04Total Harmonic Distortion Plus
NoiseTHD+N
f = 1kHz, either
FFM or SSM,
POUT = 500mWRL = 8Ω0.02
FFM93BW = 22Hz
to 22kHzSSM89
FFM96Signal-to-Noise RatioSNRPOUT = 500mW,
RL = 8Ω
A-weightedSSM92
Note 1:All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2:Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL= 4Ω, L = 33µH.
For RL= 8Ω, L = 68µH.
Note 3:Inputs AC-coupled to GND.
Note 4:Testing performed with 8Ωresistive load in series with a 68µH inductive load across BTL outputs. Mode transitions are con-
trolled by the SHDNpin.
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
Typical Operating Characteristics
(VDD= PVDD= SHDN= MUTE= 5V, GND = PGND = 0V, SYNC = VDD(SSM), unless otherwise noted. Gain = 12dB (G1 = 0, G2 = 1).
THD+N measurement bandwidth: 22Hz to 22kHz. Typical values are at TA= +25°C.) (See Typical Operating Circuit)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9759 toc01
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VDD = 5V
RL = 3Ω
POUT = 1W
POUT = 2.6W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9759 toc02
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VDD = 3.3V
RL = 3Ω
POUT = 500mW
POUT = 1.3W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9759 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VDD = 5V
RL = 4Ω
POUT = 1W
POUT = 2.2W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9759 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VDD = 3.3V
RL = 4Ω
POUT = 500mW
POUT = 700mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9759 toc05
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VDD = 5V
RL = 8Ω
POUT = 600mW
POUT = 1.2W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9759 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1100k
VDD = 3.3V
RL = 8Ω
POUT = 300mW
POUT = 500mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9759 toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VDD = 5V
RL = 8Ω
POUT = 1.2W
SSM
FFM
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9759 toc08
OUTPUT POWER (W)
THD+N (%)321
VDD = 5V
RL = 3Ω
fIN = 200Hz, 1kHz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9759 toc09
OUTPUT POWER (W)
THD+N (%)
VDD = 3.3V
RL = 3Ω
fIN = 200Hz, 1kHz
fIN = 10kHz
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9759 toc12
OUTPUT POWER (W)
THD+N (%)
VDD = 5V
RL = 8Ω
fIN = 200Hz, 1kHz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9759 toc13
OUTPUT POWER (W)
THD+N (%)
VDD = 3.3V
RL = 8Ω
fIN = 200Hz, 1kHz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9759 toc14
OUTPUT POWER (W)
THD+N (%)
VDD = 5V
fIN = 1kHz
RL = 8Ω
f = 1180kHz, FFM
f = 1400kHz, FFM
EFFICIENCY vs. OUTPUT POWER
MAX9759 toc15
OUTPUT POWER (W)
EFFICIENCY (%)321
RL = 8ΩRL = 4ΩRL = 3Ω
VDD = 5V
fIN = 1kHz
EFFICIENCY vs. OUTPUT POWER
MAX9759 toc16
OUTPUT POWER (W)
EFFICIENCY (%)
RL = 8ΩRL = 4ΩRL = 3Ω
VDD = 3.3V
fIN = 1kHz
EFFICIENCY vs. SUPPLY VOLTAGE
MAX9759 toc17
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
RL = 8Ω
RL = 4Ω
fIN = 1kHz
THD+N = 1%
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9759 toc18
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
RL = 3Ω
fIN = 1kHz
THD+N = 1%
THD+N = 10%
Typical Operating Characteristics (continued)
(VDD= PVDD= SHDN= MUTE= 5V, GND = PGND = 0V, SYNC = VDD(SSM), unless otherwise noted. Gain = 12dB (G1 = 0, G2 = 1).
THD+N measurement bandwidth: 22Hz to 22kHz. Typical values are at TA= +25°C.) (See Typical Operating Circuit)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9759 toc10
OUTPUT POWER (W)
THD+N (%)21
VDD = 5V
RL = 4Ω
fIN = 200Hz, 1kHz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9759 toc11
OUTPUT POWER (W)
THD+N (%)
VDD = 3.3V
RL = 4Ω
fIN = 200Hz, 1kHz
fIN = 10kHz
MAX9759
3.2W, High Efficiency, Low-EMI, Filterless,
Class D Audio Amplifier
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. COMMON-MODE VOLTAGE
MAX9759 toc24
COMMON-MODE VOLTAGE (V)
THD+N (%)21
VDD = 5V
RL = 8Ω
fIN = 1kHz
POUT = 300mW
DIFF INPUT
VDD = 5V
RL = 8Ω
fIN = 1kHz
POUT = 300mW
DIFF INPUT
VDD = 3.3V
RL = 8Ω
fIN = 1kHz
POUT = 300mW
DIFF INPUT
Typical Operating Characteristics (continued)
(VDD= PVDD= SHDN= MUTE= 5V, GND = PGND = 0V, SYNC = VDD(SSM), unless otherwise noted. Gain = 12dB (G1 = 0, G2 = 1).
THD+N measurement bandwidth: 22Hz to 22kHz. Typical values are at TA= +25°C.) (See Typical Operating Circuit)
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9759 toc19
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
RL = 4Ω
fIN = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9759 toc20
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
RL = 8Ω
fIN = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9759 toc21
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
VDD = 5V
fIN = 1kHz
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9759 toc22
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
VDD = 3.3V
fIN = 1kHz
10% THD+N
1% THD+N
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. COMMON-MODE VOLTAGE
MAX9759 toc23
COMMON-MODE VOLTAGE (V)
THD+N (%)21
VDD = 5V
RL = 8Ω
fIN = 1kHz
POUT = 300mW
DIFF INPUT
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9759 toc25
FREQUENCY (Hz)
CMRR (dB)
10k1k100
-100100k
INPUT REFERRED
VIN = 200mVP-P
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9759 toc26
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-100100k
OUTPUT REFERRED
INPUTS AC GROUNDED
Typical Operating Characteristics (continued)
(VDD= PVDD= SHDN= MUTE= 5V, GND = PGND = 0V, SYNC = VDD(SSM), unless otherwise noted. Gain = 12dB (G1 = 0, G2 = 1).
THD+N measurement bandwidth: 22Hz to 22kHz. Typical values are at TA= +25°C.) (See Typical Operating Circuit)
MUTE RESPONSE
MAX9759 toc32
20ms/div
500mV/divMAX9759
OUTPUT
MUTE
f = 1kHz
RL = 8Ω
SHUTDOWN RESPONSE
MAX9759 toc31
20ms/div
500mV/divMAX9759
OUTPUT
SHDN
f = 1kHz
RL = 8Ω
OUTPUT FREQUENCY SPECTRUM
MAX9759 toc28
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k10k5k
020k
SSM MODE
VOUT = -60dBV
fIN = 1kHz
RL = 8Ω
UNWEIGHTED
WIDEBAND OUTPUT SPECTRUM
(FFM MODE)
MAX9759 toc29
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dBV)
100M10M
-601000M
RBW = 10kHz
OUTPUT FREQUENCY SPECTRUM
MAX9759 toc27
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k10k5k
020k
FFM MODE
VOUT = -60dBV
fIN = 1kHz
RL = 8Ω
UNWEIGHTED
WIDEBAND OUTPUT SPECTRUM
(SSM MODE)
MAX9759 toc30
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dBV)
100M10M
-601000M
RBW = 10kHz
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
MAX9759
6, 144
1μF
PGND
OUT+
OUT-
PVDD
PVDD
GND
IN+
VDD
VDD8
IN-
SYNC
UVLO/POWER
MANAGEMENT
CLASS D
MODULATOR
PVDD
9, 12
CLICK-AND-POP
SUPPRESSION
OSCILLATOR
10μF*
1μF
1μF
MUTE
SHDN
CONTROLVDD
GND
RIN
RIN
BIAS
NOTE: TYPICAL OPERATING CIRCUIT DEPICTS MAX9759 IN FFM MODE WITH fS = 1400kHz and +18dB OF GAIN.
*BULK CAPACITANCE, IF NEEDED.
SYNC_OUT13ypical Operating Circuit/Functional Diagram
Typical Operating Characteristics (continued)
(VDD= PVDD= SHDN= MUTE= 5V, GND = PGND = 0V, SYNC = VDD(SSM), unless otherwise noted. Gain = 12dB (G1 = 0, G2 = 1).
THD+N measurement bandwidth: 22Hz to 22kHz. Typical values are at TA= +25°C.) (See Typical Operating Circuit)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9759 toc33
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
FFM
TA = +85°C
TA = -40°C
TA = +25°C
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9759 toc34
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
TA = +85°C
TA = +25°C
TA = -40°C
FFM
PACKAGE TEMPERATURE
vs. TIME
MAX9759 toc35
TIME (s)
PACKAGE TEMPERATURE (
RL = 8Ω AT 10% THD+N
RL = 4Ω AT 10% THD+N
RL = 3Ω AT 10% THD+N
MAX9759EVKIT
FREE AIR
TA = +25°C
fIN = 1kHz SINE WAVE
Detailed Description
Operating Modes
The MAX9759 filterless, Class D audio power amplifier
features several improvements to switch-mode amplifier
technology. The MAX9759 offers Class AB performance
with Class D efficiency, while occupying minimal board
space. A unique modulation scheme, synchronizable
switching frequency, and SSM mode create a compact,
flexible, low-noise, efficient audio power amplifier. The
differential input architecture reduces common-mode
noise pickup, and can be used without input-coupling
capacitors. The device can also be configured as a sin-
gle-ended input amplifier.
Comparators monitor the MAX9759 inputs and com-
pare the complementary input voltages to the sawtooth
waveform. The comparators trip when the input magni-
tude of the sawtooth exceeds their corresponding input
voltage. Both comparators reset at a fixed time after the
rising edge of the second comparator trip point, gener-
ating a minimum-width pulse tON(MIN)at the output of
the second comparator (Figure1). As the input voltage
increases or decreases, the duration of the pulse at
one output increases (the first comparator to trip) while
the other output pulse duration remains at tON(MIN).
This causes the net voltage across the speaker (VOUT+
- VOUT-) to change.
Fixed-Frequency Modulation (FFM) Mode
The MAX9759 features two FFM modes. The FFM
modes are selected by setting SYNC = GND for a
1.1MHz switching frequency, and SYNC = FLOAT for a
1.5MHz switching frequency. In FFM mode, the fre-
quency spectrum of the Class D output consists of the
fundamental switching frequency and its associated
harmonics (see the Wideband Output Spectrum (FFM
Mode) graph in the Typical Operating Characteristics).
The MAX9759 allows the switching frequency to be
changed, should the frequency of one or more of the
harmonics fall in a sensitive band. This can be done at
any time and does not affect audio reproduction.
MAX9759
3.2W, High-Efficiency, Low-EMI,
Filterless, Class D Audio Amplifier
Pin Description
PINNAMEFUNCTION
1VDDAnalog Power Supply. Bypass to GND with a 1µF ceramic capacitor.IN+Noninverting Audio InputIN-Inverting Audio InputGNDAnalog GroundSHDNActive-Low Shutdown Input. Drive SHDN low to shut down the MAX9759. Connect to VDD for normal
operation.
6, 14PGNDPower GroundSYNC
Frequency Select and External Clock Input:
SYNC = GND: Fixed-frequency mode with fS = 1100kHz.
SYNC = FLOAT: Fixed-frequency mode with fS = 1500kHz.
SYNC = VDD: Spread-spectrum mode with fS = 1200kHz ±70kHz.
SYNC = Clocked: Fixed-frequency mode with fS = external clock frequency.MUTEActive-Low Mute Function. Drive MUTE low to disable the H-bridge outputs. Connect to VDD for
normal operation.
9, 12PVDDH-Bridge Power Supply. Bypass to PGND with a 10µF ceramic capacitor.OUT-Negative Speaker OutputOUT+Positive Speaker OutputSYNC_OUTInternal Clock Output. Connect SYNC_OUT to the clock input of cascaded Maxim Class D
amplifiers. Float SYNC_OUT if unused.G2Gain Control 2 (See Table 2)G1Gain Control 1 (See Table 2)EPExposed Paddle. Can be left floating or tied to GND. For optimum thermal performance, connect EP
to GND.
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