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19-3108; Rev 1; 10/08
KIT ATION EVALU BLE AVAILA
Mono/Stereo High-Power Class D Amplifier MAX9736
General Description
The MAX9736A/B Class D amplifiers provide high-performance, thermally efficient amplifier solutions. The MAX9736A delivers 2 x 15W into 8 loads, or 1 x 30W into a 4 load. The MAX9736B delivers 2 x 6W into 8 loads or 1 x 12W into a 4 load. These devices are pinfor-pin compatible, allowing a single audio design to work across a broad range of platforms, simplifying design efforts, and reducing PCB inventory. Both devices operate from 8V to 28V and provide a high PSRR, eliminating the need for a regulated power supply. The MAX9736 offers up to 88% efficiency at 12V supply. Pin-selectable modulation schemes select between filterless modulation and classic PWM modulation. Filterless modulation allows the MAX9736 to pass CE EMI limits with 1m cables using only a low-cost ferrite bead and capacitor on each output. Classic PWM modulation is optimized for best audio performance when using a full LC filter. A pin-selectable stereo/mono mode allows stereo operation into 8 loads or mono operation into 4 loads. In mono mode, the right input op amp becomes available as a spare device, allowing flexibility in system design. Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown or mute. Input op amps allow the user to create summing amplifiers, lowpass or highpass filters, and select an optimal gain. The MAX9736A/B are available in 32-pin TQFN packages and specified over the -40C to +85C temperature range.
Features
Wide 8V to 28V Supply Voltage Range Spread-Spectrum Modulation Enables Low EMI Solution Passes CE EMI Limits with Low-Cost Ferrite Bead/Capacitor Filter Low BOM Cost, Pin-for-Pin Compatible Family High 67dB PSRR at 1kHz Reduces Supply Cost 88% Efficiency Eliminates Heatsink Thermal and Output Current Protection < 1A Shutdown Mode Mute Function Space-Saving, 7mm x 7mm x 0.8mm, 32-Pin TQFN Package
Applications
LCD/PDP/CRT Monitors LCD/PDP/CRT TVs MP3 Docking Stations Notebook PCs PC Speakers All-in-One PCs
Ordering Information
PART MAX9736AETJ+ MAX9736BETJ+ STEREO/MONO OUTPUT POWER 15W stereo/ 30W mono PIN-PACKAGE 32 TQFN-EP*
6W stereo/ 32 TQFN-EP* 12W mono Note: All devices are specified over the -40C to +85C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Simplified Diagram
8V TO 28V
8 AUDIO INPUTS 8
INPUT RESISTORS AND CAPACITORS SELECT GAIN AND CUTOFF FREQUENCY
SHDN MUTE
MONO
MAX9736
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Mono/Stereo High-Power Class D Amplifier MAX9736
ABSOLUTE MAXIMUM RATINGS
PVDD to PGND.......................................................-0.3V to +30V AGND to PGND .....................................................-0.3V to +0.3V INL, INR, FBL, FBR, COM to AGND .........-0.3V to (VREG + 0.3V) MUTE, SHDN, MONO, MOD, REGEN to AGND.......-0.3V to +6V REG to AGND ..............................................-0.3V to (VS + 0.3V) VS to AGND (Note 1)................................................-0.3V to +6V OUTL+, OUTL-, OUTR+, OUTR-, to PGND...................................-0.3V to (PVDD + 0.3V) C1N to PGND ..........................................-0.3V to (PVDD + 0.3V) C1P to PGND ...........................(PVDD - 0.3V) to (VBOOT + 0.3V) BOOT to PGND ............................................(VC1P - 0.3V) to 36V OUTL+, OUTL-, OUTR+, OUTR-, Short Circuit to PGND or PVDD...............................Continuous Thermal Limits (Notes 2, 3) Continuous Power Dissipation (TA = +70C) 32-Pin TQFN Single-Layer PCB (derate 27mW/C above +70C) .....................................2.16W JA...................................................................................37C/W JC ....................................................................................1C/W Continuous Power Dissipation (TA = +70C) 32-Pin TQFN Multiple Layer PCB (derate 37mW/C above +70C) .....................................2.96W JA...................................................................................27C/W JC ....................................................................................1C/W Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: VS cannot exceed PVDD + 0.3V. See the Power Sequencing section. Note 2: Thermal performance of this device is highly dependant on PCB layout. See the Applications Information section for more details. Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer board. For detailed information on package thermal considerations, visit www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VPVDD = 20V, VVS = 5V, AGND = PGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1F, C2 = 1F, RIN_ = 20k and RFB_= 20k, RL = , AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 4, 5)
PARAMETER Speaker Supply Voltage Range Preamplifier Supply Voltage Range Undervoltage Lockout SYMBOL PVDD VS UVLO IPVDD Quiescent Supply Current IVS Shutdown Supply Current REG Voltage Preregulator Voltage COM Voltage Capacitive Drive Output Swing (Note 6) Open-Loop Gain Input Offset Voltage AVO VOS ISHDN VREG VS VCOM CL Sinking 1mA VFB_ = VCOM 500mV, RFB_= 20k to IN_ Internal regulated 5V, VREGEN = 5V 1.9 RL = , VREGEN = 5V, VVS = open RL = , VREGEN = 0V, VVS = 5V VSHDN = 0V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX IPVDD IVS 4.2 4.8 2.05 30 2 88 1 2.2 1 14 CONDITIONS Inferred from PSRR test (Notes 1 and 7) MIN 8 4.5 7 30 45 50 20 22 10 10 TYP MAX 28 5.5 UNITS V V V mA mA A V V V pF V dB mV
AMPLIFIER DC CHARACTERISTICS
INPUT AMPLIFIER CHARACTERISTICS
2
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Mono/Stereo High-Power Class D Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = 20V, VVS = 5V, AGND = PGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1F, C2 = 1F, RIN_ = 20k and RFB_= 20k, RL = , AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 4, 5)
PARAMETER Input Amplifier Slew Rate Input Amplifier Unity-Gain Bandwidth AMPLIFIER CHARACTERISTICS Output Amplifier Gain (Note 8) Output Current Limit Output Offset Power-Supply Rejection Ratio VOS PSRR OUT_+ to OUT_-, TA = +25C PVDD = 8V to 28V, TA = +25C f = 1kHz, 100mVP-P ripple PVDD = 12V MAX9736A Output Power (THD+N = 1%) POUT_1% Stereo Mono PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono Stereo Mono MAX9736B Output Power (THD+N = 1%) POUT_1% PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono Stereo Mono MAX9736A Output Power (THD+N = 10%) POUT_10% PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono Stereo Mono MAX9736B Output Power (THD+N = 10%) POUT_10% PVDD = 18V PVDD = 24V Stereo Mono Stereo Mono RL = 8 RL = 4 RL = 4 RL = 8 RL = 4 RL = 8 RL = 4 RL = 8 RL = 4 RL = 4 RL = 8 RL = 4 RL = 8 RL = 4 RL = 8 RL = 4 RL = 4 RL = 8 RL = 4 RL = 8 RL = 4 RL = 8 RL = 4 RL = 4 RL = 8 RL = 4 RL = 8 RL = 4 65 AV MAX9736A MAX9736B 16.5 13.1 3.3 17 13.6 4.6 2 80 67 8 13 15.5 13.5 27 13.5 27 6 11 12 6 12 6 12 10 16 19.5 17.5 35 17.5 35 7.5 14 15 7.5 15 7.5 15 W W W W 10 17.5 14.1 dB A mV dB SYMBOL CONDITIONS MIN TYP 2.5 3.5 MAX UNITS V/s MHz
MAX9736
PVDD = 12V
PVDD = 12V
PVDD = 12V
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3
Mono/Stereo High-Power Class D Amplifier MAX9736
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = 20V, VVS = 5V, AGND = PGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1F, C2 = 1F, RIN_ = 20k and RFB_= 20k, RL = , AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 4, 5)
PARAMETER Total Harmonic Distortion Plus Noise SYMBOL CONDITIONS MAX9736A, POUT = 4W, f = 1kHz, PWM modulation mode, RL = 8 MAX9736B, POUT = 2W, f = 1kHz, PWM modulation mode, RL = 8 MAX9736A, POUT = 8W, RL = 8 MAX9736B, POUT = 6W, RL = 8 Noise Crosstalk Efficiency VN A-weighted (Note 9) MAX9736A MAX9736B MIN TYP 0.04 % 0.04 96.5 dB 97 120 100 100 88 36 dBV Out of mute 270 36 300 4 160 30 tON VINH VINL 50 10 2 0.8 110 330 kHz kHz C C ms V V mV A VRMS dB % MAX UNITS
THD+N
Signal-to-Noise Ratio
SNR
A-weighted
L to R, R to L, POUT = 1W, f = 1kHz, RL = 8 POUT = 8W, MAX9736A, PVDD = 12V, RL = 8 Peak voltage, 32 samples/second, A-weighted (Notes 9 and 10) Into mute
Click-and-Pop Level
KCP
Switching Frequency Spread-Spectrum Bandwidth Thermal Shutdown Level Thermal Shutdown Hysteresis Turn-On Time DIGITAL INTERFACE Input Voltage High Input Voltage Low Input Voltage Hysteresis Input Leakage Current
Note 4: All devices are 100% production tested at +25C. All temperature limits are guaranteed by design. Note 5: Stereo mode (MONO = GND) specified with 8 resistive load in series with a 68H inductive load connected across BTL outputs. Mono mode (MONO = 5V) specified with a 4 resistive load in series with a 33H inductive load connected across BTL outputs. Note 6: Output swing is specified with respect to VCOM. Note 7: For typical applications, an external 5V supply is not required. Therefore, set REGEN = 5V. If thermal performance is a concern, set REGEN = 0V and provide an external regulated 5V supply. Note 8: Output amplifier gain is defined as:
| (VOUT_ + ) - (VOUT _ - ) | 20 x log | VFB _ |
Note 9: Amplifier inputs AC-coupled to GND. Note 10: Specified at room temperature with an 8 resistive load in series with a 68H inductive load connected across BTL outputs. Mode transitions controlled by SHDN control pin.
4
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Mono/Stereo High-Power Class D Amplifier
Typical Operating Characteristics
(MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX9736 toc01
MAX9736
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX9736 toc02
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
PVDD = 12V, FIXED FREQUENCY, 4 LOAD POUT = 5W
MAX9736 toc03
1
1
PVDD = 12V, FIXED FREQUENCY, 8 LOAD POUT = 5W
PVDD = 12V, SPREAD SPECTRUM, 8 LOAD POUT = 5W
1
0.1 THD+N (%) THD+N (%)
0.1
0.1 THD+N (%) POUT = 3W 0.01
POUT = 3W 0.01
POUT = 3W 0.01
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX9736 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc05
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
PVDD = 12V, SPREAD SPECTRUM, 8 LOAD 6kHz 1kHz 0.1
MAX9736 toc06
1
PVDD = 12V, SPREAD SPECTRUM, 4 LOAD
10 PVDD = 12V, FIXED FREQUENCY, 8 LOAD 1 6kHz 0.1
10
1 THD+N (%)
0.1 THD+N (%)
THD+N (%)
POUT = 5W
1kHz
0.01
POUT = 3W 0.01 20Hz 0.01 20Hz
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 0 1 2 3 4 5 6 7 8 9 10 OUTPUT POWER (W)
0.001 0 1 2 3 4 5 6 7 8 9 10 OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc07
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc08
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
PVDD = 24V, FIXED FREQUENCY, 8 LOAD 1 THD+N (%) 6kHz 0.1
MAX9736 toc09
10 PVDD = 18V, FIXED FREQUENCY, 8 LOAD 1 THD+N (%) 6kHz 0.1 1kHz
10 PVDD = 18V, SPREAD SPECTRUM, 8 LOAD 1 THD+N (%) 1kHz 0.1 6kHz
10
0.01 20Hz 0.001 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W)
0.01
20Hz
0.01 1kHz
20Hz
0.001 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W)
0.001 0 4 8 12 16 OUTPUT POWER (W)
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5
Mono/Stereo High-Power Class D Amplifier MAX9736
Typical Operating Characteristics (continued)
(MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc10
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc11
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
PVDD = 12V, SPREAD SPECTRUM, 4 LOAD 1 1kHz 6kHz 0.1 20Hz 0.01
MAX9736 toc12
10 PVDD = 24V, SPREAD SPECTRUM, 8 LOAD 1 THD+N (%) 1kHz 0.1 6kHz
10 PVDD = 12V, FIXED FREQUENCY, 4 LOAD 1 6kHz THD+N (%)
10
0.1 20Hz 1kHz 0.01
0.01
20Hz
0.001 0 2 4 6 8 10 12 14 16 18 OUTPUT POWER (W)
0.001 0 2 4 6 8 10 12 14 16 OUTPUT POWER (W)
THD+N (%)
0.001 0 3 6 9 12 15 18 OUTPUT POWER (W)
EFFICIENCY vs. TOTAL OUTPUT POWER
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 TOTAL OUTPUT POWER (W) POWER DISSIPATION
MAX9736 toc13
EFFICIENCY vs. TOTAL OUTPUT POWER
10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 2 4 6 8 10 12 14 16 18 20 TOTAL OUTPUT POWER (W) POWER DISSIPATION
MAX9736 toc14
PVDD = 12V, FIXED FREQUENCY, 8 LOAD EFFICIENCY
PVDD = 12V, SPREAD SPECTRUM, 8 LOAD EFFICIENCY
10 9 POWER DISSIPATION (W) POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0
EFFICIENCY vs. TOTAL OUTPUT POWER
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 TOTAL OUTPUT POWER (W) EFFICIENCY POWER DISSIPATION
MAX9736 toc15
EFFICIENCY vs. TOTAL OUTPUT POWER
10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 TOTAL OUTPUT POWER (W) POWER DISSIPATION
MAX9736 toc16
PVDD = 18V, SPREAD SPECTRUM, 8 LOAD
PVDD = 18V, FIXED FREQUENCY, 8 LOAD EFFICIENCY
10 9 8 7 6 5 4 3 2 1 0
6
_______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
Typical Operating Characteristics (continued)
(MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.)
EFFICIENCY vs. TOTAL OUTPUT POWER
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 TOTAL OUTPUT POWER (W) POWER DISSIPATION PVDD = 24V, FIXED FREQUENCY, 8 LOAD EFFICIENCY
MAX9736 toc17
MAX9736
EFFICIENCY vs. TOTAL OUTPUT POWER
10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 TOTAL OUTPUT POWER (W) POWER DISSIPATION EFFICIENCY PVDD = 24V, SPREAD SPECTRUM, 8 LOAD
MAX9736 toc18
10 9 POWER DISSIPATION (W) POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0
EFFICIENCY vs. TOTAL OUTPUT POWER
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 TOTAL OUTPUT POWER (W) POWER DISSIPATION EFFICIENCY
MAX9736 toc19
EFFICIENCY vs. TOTAL OUTPUT POWER
10 9 POWER DISSIPATION (W) 8 7 6 5 4 3 2 1 0 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 TOTAL OUTPUT POWER (W) POWER DISSIPATION EFFICIENCY PVDD = 12V, SPREAD SPECTRUM, 4 LOAD
MAX9736 toc20
10 9 8 7 6 5 4 3 2 1 0
PVDD = 12V, FIXED FREQUENCY, 4 LOAD
TOTAL OUTPUT POWER vs. VDD LOAD = 8, f = 1kHz
MAX9736 toc21
TOTAL OUTPUT POWER vs. LOAD RESISTANCE VDD = 12V, f = 1kHz, SPREAD SPECTRUM
MAX9736 toc22
TOTAL OUTPUT POWER vs. LOAD RESISTANCE VDD = 18V, f = 1kHz, SPREAD SPECTRUM
MAX9736 toc23
40 35 OUTPUT POWER (W) 30 25 20 15 10 5 0 5 10 15 20 25 1% THD+N 10% THD+N
16 14 OUTPUT POWER (W) 12 10 8 10% THD+N 6 4 2 0 5 1% THD+N
30 25 OUTPUT POWER (W) 20 15 10 5 0 1% THD+N 10% THD+N
30
10
15
20
25
30
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
LOAD RESISTANCE ()
LOAD RESISTANCE ()
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7
Mono/Stereo High-Power Class D Amplifier MAX9736
Typical Operating Characteristics (continued)
(MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.)
TOTAL OUTPUT POWER vs. LOAD RESISTANCE
MAX9736 toc24
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 -30 PSRR (dB) 100mVP-P, PVDD RIPPLE, 8 LOAD
MAX9736 toc25
CROSSTALK vs. FREQUENCY
1W OUTPUT, 8 LOAD, SPREAD SPECTRUM
MAX9736 toc26
40 35 TOTAL OUTPUT POWER (W) 30 25 20 15 10 1% THD+N 5 0 0 5 10 15 20 25 10% THD+N PVDD = 24V, SPREAD SPECTRUM
0
0 -20 CROSSTALK (dB) -40 -60 RIGHT TO LEFT -80 -100 LEFT TO RIGHT -120
-40 -50 -60 -70 -80 -90
30
10
100
1k FREQUENCY (Hz)
10k
100k
10
100
1k FREQUENCY (Hz)
10k
100k
LOAD RESISTANCE ()
INBAND OUTPUT SPECTRUM
MAX9736 toc27
INBAND OUTPUT SPECTRUM
MAX9736 toc28
WIDEBAND OUTPUT SPECTRUM
8 LOAD, FIXED FREQUENCY
MAX9736 toc29
0 -20 OUTPUT AMPLITUDE (dBV) -40 -60 -80 -100 -120 0 5 10 FREQUENCY (kHz) 15 8 LOAD, FIXED FREQUENCY
0 -20 OUTPUT AMPLITUDE (dBV) -40 -60 -80 -100 -120 8 LOAD, SPREAD SPECTRUM
20 0 OUTPUT AMPLITUDE (dBV) -20 -40 -60 -80 -100 -120
20
0
5
10 FREQUENCY (kHz)
15
20
0.1
1
10
100
FREQUENCY (MHz)
WIDEBAND OUTPUT SPECTRUM
0 OUTPUT AMPLITUDE (dBV) -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0.1 1 10 100 8 LOAD, SPREAD SPECTRUM
MAX9736 toc30
SHDN ON-/OFF-RESPONSE
MAX9736 toc31
MUTE ON-/OFF-RESPONSE
MAX9736 toc32
10
SHDN 2V/div
MUTE 2V/div
OUTPUT 5V/div
OUTPUT 5V/div
40ms/div
40ms/div
FREQUENCY (MHz)
8
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Mono/Stereo High-Power Class D Amplifier
Typical Operating Characteristics (continued)
(MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.)
SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE
MAX9736 toc33
MAX9736
SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE
VREGEN = 0V, VMUTE = VSHDN = 3.3V, VS = 5V SUPPLY CURRENT (mA) 15
MAX9736 toc34
SUPPLY CURRENT vs. VS SUPPLY VOLTAGE
VREGEN = 0V, VMUTE = VSHDN = 3.3V 13 SUPPLY CURRENT (mA)
MAX9736 toc35
40 VREGEN = VMUTE = VSHDN = 3.3V SUPPLY CURRENT (mA) 30
20
15
11
20
10
9
10
5
7
0 8 13 18 SUPPLY VOLTAGE (V) 23 28
0 8 13 18 SUPPLY VOLTAGE (V) 23 28
5 4.5 4.7 4.9 5.1 5.3 5.5 VS VOLTAGE (V)
SHUTDOWN CURRENT vs. PVDD SUPPLY VOLTAGE
MAX9736 toc36
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX9736 toc37
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
PVDD = 12V, SPREAD SPECTRUM, 4 LOAD, MONO POUT = 10W
MAX9736 toc38
3 VREGEN = VSHDN = 0V, VMUTE = 3.3V SHUTDOWN CURRENT (A) 2
1
PVDD = 12V, FIXED FREQUENCY, 4 LOAD, MONO
1
POUT = 10W
0.1 THD+N (%) 1 THD+N (%)
0.1
0
POUT = 6W 0.01
POUT = 6W 0.01
-1
-2 8 12 16 20 24 28 SUPPLY VOLTAGE (V)
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc39
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (VDD = 12V, SPREAD SPECTRUM, 4 LOAD, MONO)
MAX9736 toc40
10 PVDD = 12V, FIXED FREQUENCY, 4 LOAD, MONO 1 THD+N (%) 6kHz
10
1 THD+N (%) 1kHz
6kHz
0.1
1kHz 20Hz
0.1
20Hz 0.01 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W) 0.01 0 2 4 6 8 10 12 14 16 18 20 OUTPUT POWER (W)
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9
Mono/Stereo High-Power Class D Amplifier MAX9736
Typical Operating Characteristics (continued)
(MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc41
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9736 toc42
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
PVDD = 24V, FIXED FREQUENCY, 4 LOAD, MONO
MAX9736 toc43
10
PVDD = 18V, FIXED FREQUENCY, 4 LOAD, MONO
10
PVDD = 18V, SPREAD SPECTRUM, 4 LOAD, MONO
10
1 THD+N (%) THD+N (%) 6kHz
1 THD+N (%) 6kHz 1kHz 0.1
1 6kHz
0.1
1kHz
0.1
1kHz
20Hz 0.01 0 5 10 15 20 25 30 35 OUTPUT POWER (W) 0.01 0 5 10 15 20 25
20Hz 0.01 30 35 0 5 10 15 20
20Hz 25 30 35
OUTPUT POWER (W)
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (VDD = 24V, SPREAD SPECTRUM, 4 LOAD, MONO)
MAX9736 toc44
EFFICIENCY vs. OUTPUT POWER
80 70 EFFICIENCY (%) 60 PVDD = 18V 50 40 30 20 PVDD = 24V PVDD = 12V
MAX9736 toc45
10
90
1 THD+N (%) 6kHz 1kHz 0.1
20Hz 0.01 0 6 12 18 24 30 36 OUTPUT POWER (W)
10 0 0 5
4 LOAD, MONO, 1kHz FIXED FREQUENCY 10 OUTPUT POWER (W) 15 20
EFFICIENCY vs. OUTPUT POWER
MAX9736 toc46
OUTPUT POWER vs. VDD (LOAD = 4, f = 1kHz, SPREAD SPECTRUM, MONO)
35 OUTPUT POWER (W) 30 25 20 15 10 4 LOAD f = 1kHz, SPREAD SPECTRUM, MONO 8 10 12 14 16 18 20 22 24 26 28 SUPPLY VOLTAGE (V) 1% THD+N 10% THD+N
MAX9736 toc47
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 OUTPUT POWER (W) 15 4 LOAD, MONO, f = 1kHz SPREAD SPECTRUM PVDD = 12V PVDD = 18V PVDD = 24V
40
5 0 20
10
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
Typical Operating Characteristics (continued)
(MAX9736A, PVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless otherwise noted.)
OUTPUT POWER vs. LOAD RESISTANCE
MAX9736 toc48
MAX9736
OUTPUT POWER vs. LOAD RESISTANCE
MAX9736 toc49
OUTPUT POWER vs. LOAD RESISTANCE
35 OUTPUT POWER (W) 30 25 20 15 10 10% THD+N PVDD = 24V, MONO, SPREAD SPECTRUM
MAX9736 toc50
20 18 16 OUTPUT POWER (W) 14 12 10 8 6 4 2 0 0 5 10 15 20 25 1% THD+N 10% THD+N PVDD = 12V, MONO, SPREAD SPECTRUM
40 35 OUTPUT POWER (W) 30 25 20 10% THD+N 15 10 5 0 0 5 1% THD+N 10 15 20 25 PVDD = 18V, MONO, SPREAD SPECTRUM
40
5 0 30 0
1% THD+N 5 10 15 20 25 30
30
LOAD RESISTANCE ()
LOAD RESISTANCE ()
LOAD RESISTANCE ()
SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE
MAX9736 toc51
SUPPLY CURRENT vs. PVDD SUPPLY VOLTAGE
VREGEN = 0V, VMUTE = VSHDN = 3.3V, VS = 5V, MONO SUPPLY CURRENT (mA) 15
MAX9736 toc52
SUPPLY CURRENT vs. VS VOLTAGE
VREGEN = 0V, VMUTE = VSHDN = 3.3V, MONO SUPPLY CURRENT (mA) 15
MAX9736 toc53
45 VREGEN = VMUTE = VSHDN = 3.3V, MONO SUPPLY CURRENT (mA)
20
20
30
10
10
15
5
5
0 8 13 18 23 28 SUPPLY VOLTAGE (V)
0 8 13 18 SUPPLY VOLTAGE (V) 23 28
0 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 VS VOLTAGE (V)
______________________________________________________________________________________
11
Mono/Stereo High-Power Class D Amplifier MAX9736
Pin Description
PIN 1, 2 3 4 5 6 7, 8, 17 9 10 11 12 13, 14 15 16 NAME OUTLBOOT MONO FBL INL N.C. MUTE SHDN REGEN COM AGND REG VS Left-Channel Negative Speaker Output Charge-Pump Output. Connect a 1F charge-pump holding capacitor from BOOT to PGND. Mono Select. Set MONO high for mono mode, low for stereo mode. Left-Channel Feedback. Connect feedback resistor between FBL and INL to set amplifier gain. Stereo Left-Channel Inverting Input. In mono mode, INL is the inverting audio input for the mono amplifier. No Connection. Not internally connected. OK to connect to PGND. Mute Input. Drive MUTE low to place the device in mute mode. Shutdown Input. Drive SHDN low to place the device in shutdown mode. Internal Regulator Enable Input. Connect REGEN to SHDN to enable the internal regulator. Drive REGEN low to disable the internal regulator, and supply the device with an external 5V supply on VS. See the Power-Supply Sequencing section. Internal 2V Bias. Bypass COM to AGND with a 1F capacitor. Analog Ground Internal Regulator Output. Bypass REG to AGND with a 1F capacitor. 5V Regulator Supply. Bypass VS to AGND with a 1F capacitor. If REGEN is low, the internal regulator is disabled, and an external 5V supply must be connected to VS. See the Power-Supply Sequencing section. Stereo Right-Channel Inverting Audio Input. In mono mode, INR is the inverting audio input for the uncommitted preamplifier (see the Mono Configuration section for more details). Right-Channel Feedback. Connect feedback resistor between FBR and INR to set amplifier gain. Output Modulation Select. Sets the output modulation scheme: VMOD = Low, classic PWM/fixed-frequency mode VMOD = High, filterless modulation/spread-spectrum mode Charge-Pump Flying-Capacitor Negative Terminal Charge-Pump Flying-Capacitor Positive Terminal Right-Channel Negative Speaker Output Right-Channel Positive Speaker Output Power Supply. Bypass each PVDD pin to ground with 0.1F capacitors. Also, use a single 220F capacitor between PVDD and PGND. Power Ground Left-Channel Positive Speaker Output Exposed Pad. Must be externally connected to PGND. FUNCTION
18 19 20 21 22 23, 24 25, 26 27, 30 28, 29 31, 32 --
INR FBR MOD C1N C1P OUTROUTR+ PVDD PGND OUTL+ EP
12
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier MAX9736
Detailed Description
The MAX9736A/MAX9736B filterless, stereo Class D audio power amplifiers offer Class AB performance and Class D efficiency with minimal board space. The MAX9736A outputs 2x15W in stereo mode and 30W in mono mode. The MAX9736B outputs 2x6W in stereo mode and 12W in mono mode. These devices operate from an 8V to 28V supply range. The MAX9736 features a filterless, spread-spectrum switching mode (MOD = high) or a classic PWM fixedfrequency switching mode (MOD = low). The MAX9736 features externally set gain and a lowpower shutdown mode that reduces supply current to less than 1A. Comprehensive click-and-pop circuitry minimizes noise into and out of shutdown or mute.
Efficiency
The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors. In a Class D amplifier, the output transistors act as switches and consume negligible power. Power loss associated with the Class D output stage is due to the I2R loss of the MOSFET on-resistance, various switching losses, and quiescent current overhead. The theoretical best efficiency of a linear amplifier is 78% at peak output power. Under typical music reproduction levels, the efficiency falls below 30%, whereas the MAX9736 exhibits > 80% efficiency under the same conditions (Figure 1).
Shutdown
The MAX9736 features a shutdown mode that reduces power consumption and extends battery life in portable applications. The shutdown mode reduces supply current to 1A (typ). Drive SHDN high for normal operation. Drive SHDN low to place the device in low-power shutdown mode. In shutdown mode, the outputs are high impedance; and the common-mode voltage at the output decays to zero. In shutdown mode, connect REGEN low to minimize current consumption.
Operating Modes
Filterless Modulation/PWM Modulation The MAX9736 features two output modulation schemes, filterless modulation (MOD = high) or classic PWM (MOD = low). Maxim's unique, filterless modulation scheme eliminates the LC filter required by traditional Class D amplifiers, reducing component count, conserving board space, and reducing system cost. Configure for classic PWM output when using a full LC filter. Click-and-pop protection does not apply when the output is switching between modulation schemes. To maintain click-and-pop protection when switching between output schemes the device must enter shutdown mode and be configured to the new output scheme before the startup sequence is finished. Spread-Spectrum Mode The MAX9736 features a unique, patented spread-spectrum mode that flattens the wideband spectral components, improving EMI radiated by the speaker and cables. The switching frequency of the Class D amplifier varies randomly by 6kHz around the 300kHz center frequency. Instead of a large amount of spectral energy present at multiples of the switching frequency, the energy is spread over a bandwidth that increases with frequency. Above a few megahertz, the wideband spectrum looks like white noise for EMI purposes. A proprietary amplifier topology ensures this white noise does not corrupt the noise floor in the audio bandwidth. The spreadspectrum mode is enabled only with filterless modulation.
Mute Function
The MAX9736 features a clickless-and-popless mute mode. When the device is muted, the signal is attenuated at the speaker and the outputs stop switching. To mute the MAX9736, drive MUTE low. Hold MUTE low during system power-up and power-down to ensure that clicks and pops caused by circuits before the MAX9736 are suppressed.
EFFICIENCY vs. TOTAL OUTPUT POWER
90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 5 10 15 20 TOTAL OUTPUT POWER (W) CLASS AB MAX9736A
MAX9736 fig01
100
Figure 1. MAX9736A Efficiency vs. Class AB Efficiency
______________________________________________________________________________________ 13
Mono/Stereo High-Power Class D Amplifier MAX9736
Click-and-Pop Suppression
AMPLITUDE (dBV/m)
The MAX9736 features comprehensive click-and-pop suppression that minimizes audible transients on startup and shutdown. While in shutdown, the H-bridge is in a high-impedance state.
40 35 30 25 20 15 10 5 30 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz)
EN55022B LIMIT
Mono Configuration
The MAX9736 features a mono mode that allows the right and left channels to operate in parallel, achieving up to 30W (MAX9736A) of output power. Apply a logichigh to MONO to enable mono mode. In mono mode, an audio signal applied to the left channel (INL) is routed to the H-bridges of both channels. Also in mono mode, the right-channel preamplifier becomes an uncommitted operational amplifier, allowing for flexibility in system design. Connect OUTL+ to OUTR+ and OUTL- to OUTR- using heavy PCB traces as close as possible to the device. Driving MONO low (stereo mode) while the outputs are wired together in mono mode can trigger the short-circuit or thermal-overload protection or both.
Figure 2. EMI Performance
FB1
MAX9736
FB2 C1 330pF C2 330pF
Current Limit
When the output current reaches the current limit, 4.6A (typ), the MAX9736 disables the outputs and initiates a 450s startup sequence. The shutdown and startup sequence is repeated until the output fault is removed. Properly designed applications do not enter currentlimit mode unless the output is short circuited or connected incorrectly.
FB1 AND FB2 = WURTH 742792040
Figure 3. Ferrite Bead Filter
Thermal Shutdown
When the die temperature reaches the thermal shutdown threshold, +160C (typ), the MAX9736 outputs are disabled. When the die temperature decreases by 30C, normal operation resumes. Some causes of thermal shutdown are excessively low load impedance, poor thermal contact between the MAX9736`s exposed pad and the PCB, elevated ambient temperature, or poor PCB layout and assembly.
C2 C4 R1 L1 C1
MAX9736
L2
C3
C5 R2
Applications Information
Filterless Class D Operation
The MAX9736 meets EN55022B EMC radiation limits with an inexpensive ferrite bead and capacitor filter when the speaker leads are less than or equal to 1m. Select a ferrite bead with 100 to 600 impedance and rated for at least 2A. The capacitor value varies based on the ferrite bead chosen and the speaker lead length. See Figure 3 for the correct connections of these components.
Figure 4. Output Filter for PWM Mode
When evaluating the MAX9736 with a ferrite bead filter and resistive load, include a series inductor (68H for 8 load and 33H for 4 load) to model the actual loudspeaker's behavior. Omitting the series inductor
14
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier MAX9736
Table 1. Suggested Values for LC Filter
RL () 4 8 16 L1, L2 (H) 10 15 33 C1 (F) 0.47 0.15 0.10 C2, C3 (F) 0.10 0.15 0.10 C4, C5 (F) 0.22 0.15 0.10 R1, R2 () 10 15 33
reduces the efficiency, the THD+N performance, and the output power of the MAX9736. When evaluating with a load speaker, no series inductor is required.
Inductor-Based Output Filters
Some applications use the MAX9736 with a full inductor-/capacitor-based (LC) output filter. Select the PWM output mode for best audio performance. See Figure 4 for the correct connections of these components. The load impedance of the speaker determines the filter component selection (see Table 1). Inductors L1 and L2, and capacitor C1 form the primary output filter. Capacitors C2 and C3 provide commonmode filtering to reduce radiated emissions. Capacitors C4 and C5, plus resistors R1 and R2, form a Zobel at the output. A Zobel corrects the output loading to compensate for the rising impedance of the loudspeaker. Without a Zobel the filter exhibits a peak response near the cutoff frequency.
Input Capacitor An input capacitor, CIN, in conjunction with the input resistor, RIN, of the MAX9736 forms a highpass filter that removes the DC bias from an incoming signal. The AC-coupling capacitor allows the amplifier to automatically bias the signal to an optimum DC level. Assuming zero-source impedance, the -3dB point of the highpass filter is given by:
f-3dB = 1 2RINCIN
Choose CIN so that f-3dB is well below the lowest frequency of interest. Use capacitors whose dielectrics have low voltage coefficients. Capacitors with high-voltage coefficients cause increased distortion close to f-3dB.
COM Capacitor COM is the output of the internally generated DC bias voltage. Bypass COM with a 1F capacitor to AGND.
Component Selection
Gain-Setting Resistors External feedback resistors set the gain of the MAX9736. The output stage provides a fixed internal gain in addition to the externally set input stage gain. For the MAX9736A, the fixed output-stage gain is set at 17dB (7V/V). For the MAX9736B, the fixed output-stage gain is set at 13.6dB (4.8V/V). Set overall gain by using resistors RF and RIN (Figure 5) as follows:
R MAX9736A : A V = -7.1 F V / V RIN R MAX9736B : A V = -4.8 F V / V RIN where A V is the desired voltage gain. Choose R F between 10k and 50k. The FB terminal is an op amp output and the IN terminal is the op amp inverting input, allowing the MAX9736 to be configured as a summing amplifier, a filter, or an equalizer.
Power Supplies
The MAX9736 features separate supplies for signal and power portions of the device, allowing for the optimum combination of headroom, power dissipation, and noise immunity. The speaker amplifiers are powered from PVDD and can range from 8V to 28V. The remainder of the MAX9736 is powered by VS.
Power-Supply Sequencing During power-up and power-down, VS must not exceed PVDD. VS greater than PVDD will damage the device.
RF AUDIO INPUT CIN RIN
FB_ IN_ COM OUT_+ OUT_-
CCOM
MAX9736
Figure 5. Setting Gain
______________________________________________________________________________________ 15
Mono/Stereo High-Power Class D Amplifier MAX9736
Internal Regulator The MAX9736 features an internal 5V regulator, VS, powered from PVDD. Connect REGEN to SHDN so that the internal 5V regulator is enabled/disabled when the MAX9736 is enabled/disabled. If an external 5V supply is available, drive REGEN low and connect external 5V supply to VS to minimize the power dissipation of the MAX9736.
Use wide, low-resistance output traces. Current drawn from the outputs increases as load impedance decreases. High-output trace resistance decreases the power delivered to the load. The MAX9736 TQFN package features an exposed thermal paddle on its underside. This paddle lowers the package's thermal resistance by providing a heat conduction path from the die to the PCB. Connect the exposed thermal pad to PGND by using a large pad and multiple vias to the PGND plane.
Supply Bypassing, Layout, and Grounding
Proper layout and grounding are essential for optimum performance. Use wide traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance. Proper grounding improves audio performance, minimizes crosstalk between channels, and prevents switching noise from coupling into the audio signal. Connect PGND and AGND together at a single point on the PCB. Route all traces that carry switching transients away from AGND and the traces/components in the audio signal path. Bypass each PVDD pin with a 0.1F capacitor to PGND. Place the bypass capacitors as close as possible to the MAX9736. Place a 220F capacitor between PVDD and PGND. Bypass VS with a 1F capacitor to AGND.
16
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
Typical Application Circuit for Stereo Output Configuration
8V TO 28V
MAX9736
0.1F
0.1F
CBULK 220F
C1 0.1F 1F VS 16 PVDD 27, 30 C1P 22 C1N 21
REG 15 1F
REGULATOR
CHARGE PUMP
3 BOOT C2 1F
20k 20k 470nF
FBL 5 INL 6 31, 32 OUTL+ 1, 2 OUTL-
COM 12 1F
BIAS
POWER STAGE
20k 470nF 20k
INR 18 FBR 19 REGEN 11
25, 26 OUTR+ 23, 24 OUTR-
SHUTDOWN MUTE 5V
SHDN 10 MUTE 9 CONTROL MOD 20 MONO 4
MAX9736
13, 14 AGND
28, 29 PGND
7, 8, 17 N.C.
NOTE: PREAMPLIFIER GAIN SET AT 0dB.
______________________________________________________________________________________
17
Mono/Stereo High-Power Class D Amplifier MAX9736
Typical Application Circuit for Single (Mono) Output Configuration
8V TO 28V
0.1F
0.1F
CBULK 220F
C1 0.1F 1F VS 16 PVDD 27, 30 C1P 22 C1N 21
REG 15 1F LPF
REGULATOR
CHARGE PUMP
3 BOOT C2 1F
FBL 5 FBR INL 6 31, 32 OUTL+ 1, 2 OUTL-
COM 12 1F HPF
BIAS
POWER STAGE
INR 18 AUDIO INPUT FBR 19
25, 26 OUTR+ 23, 24 OUTR-
FBR REGEN 11 SHUTDOWN MUTE 5V MOD 20 MONO 4 13, 14 AGND 28, 29 PGND 7, 8, 17 N.C. SHDN 10 MUTE 9
MAX9736
CONTROL
18
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
Pin Configuration
PROCESS: BiCMOS
OUTROUTRMOD C1N C1P N.C.
Chip Information
MAX9736
TOP VIEW
FBR 19
24 OUTR+ 25 OUTR+ 26 PVDD 27 PGND 28 PGND 29 PVDD 30 OUTL+ 31 OUTL+ 32 1 OUTL-
23
22
21
20
18
INR
17 16 15 14 13 VS REG AGND AGND COM REGEN SHDN MUTE
MAX9736
12 11
+
2 OUTL-
EP*
10 9
3 BOOT
4 MONO
5 FBL
6 INL
7 N.C.
8 N.C.
TQFN-EP (7mm x 7mm x 0.8mm)
EP* = EXPOSED PAD, CONNECT TO PGND.
______________________________________________________________________________________
19
Mono/Stereo High-Power Class D Amplifier MAX9736
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 32 TQFN-EP PACKAGE CODE T3277-3 DOCUMENT NO. 21-0144
20
______________________________________________________________________________________
32, 44, 48L QFN.EPS
Mono/Stereo High-Power Class D Amplifier
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9736
______________________________________________________________________________________
21
Mono/Stereo High-Power Class D Amplifier MAX9736
Revision History
REVISION NUMBER 0 1 REVISION DATE 1/08 12/08 Initial release Corrected various errors DESCRIPTION PAGES CHANGED -- 1-15, 17-21
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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