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MAX9700DEUB+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
General Description
The MAX9700 mono class D audio power amplifier pro-
vides class AB amplifier performance with class D effi-
ciency, conserving board space and extending battery
life. Using a class D architecture, the MAX9700 delivers
1.2W into an 8Ω load while offering efficiencies above
90%. A low-EMI modulation scheme renders the tradi-
tional class D output filter unnecessary.
The MAX9700 offers two modulation schemes: a fixed-
frequency (FFM) mode, and a spread-spectrum (SSM)
mode that reduces EMI-radiated emissions due to the
modulation frequency. Furthermore, the MAX9700 oscil-
lator can be synchronized to an external clock through
the SYNC input, allowing the switching frequency to be
user defined. The SYNC input also allows multiple
MAX9700s to be cascaded and frequency locked, mini-
mizing interference due to clock intermodulation. The
device utilizes a fully differential architecture, a full-
bridged output, and comprehensive click-and-pop sup-
pression. The gain of the MAX9700 is set internally
(MAX9700A: 6dB, MAX9700B: 12dB, MAX9700C:
15.6dB, MAX9700D: 20dB), further reducing external
component count.
The MAX9700 features high 72dB PSRR, a low 0.01%
THD+N, and SNR in excess of 90dB. Short-circuit and
thermal-overload protection prevent the device from
damage during a fault condition. The MAX9700 is avail-
able in 10-pin TDFN (3mm
✕
3mm
✕
0.8mm), 10-pin
µMAX
®
, and 12-bump UCSP™ (1.5mm
✕
2mm
✕
0.6mm)
packages. The MAX9700 is specified over the extended
-40°C to +85°C temperature range.
Applications
Features
♦ Filterless Amplifier Passes FCC Radiated
Emissions Standards with 100mm of Cable
♦ Unique Spread-Spectrum Mode Offers 5dB
Emissions Improvement Over Conventional
Methods
♦ Optional External SYNC Input
♦ Simple Master-Slave Setup for Stereo Operation
♦ 94% Efficiency
♦ 1.2W into 8Ω
♦ Low 0.01% THD+N
♦ High PSRR (72dB at 217Hz)
♦ Integrated Click-and-Pop Suppression
♦ Low Quiescent Current (4mA)
♦ Low-Power Shutdown Mode (0.1µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in Thermally Efficient, Space-Saving
Packages
10-Pin TDFN (3mm x 3mm x 0.8mm)
10-Pin µMAX
12-Bump UCSP (1.5mm x 2mm x 0.6mm)
MAX9700
1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
5
10
9
8
7
6
PV
DD
OUT-
OUT+
PGNDGND
IN-
IN+
V
DD
MAX9700
TDFN/μMAX
TOP VIEW
SYNCSHDN
Pin Configurations
Ordering Information
MAX9700
DIFFERENTIAL
AUDIO INPUT
SYNC
INPUT
V
DD
OSCILLATOR
MODULATOR
AND H-BRIDGE
Block Diagram
19-3030; Rev 2; 10/08
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Cellular Phones
PDAs
MP3 Players
Portable Audio
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX9700AETB
-40
o
C to +85
o
C 10 TDFN-EP*
ACM
MAX9700AEUB
-40
o
C to +85
o
C
10 µMAX —
MAX9700AEBC-T
-40
o
C to +85
o
C
12 UCSP —
MAX9700BETB
-40
o
C to +85
o
C 10 TDFN-EP*
ACI
MAX9700BEUB
-40
o
C to +85
o
C
10 µMAX —
MAX9700BEBC-T
-40
o
C to +85
o
C
12 UCSP —
Pin Configurations continued at end of data sheet.
Ordering Information continued and Selector Guide appears
at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
*EP = Exposed pad.
1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
= V
SHDN
= 3.3V, V
GND
= V
PGND
= 0V, SYNC = GND (FFM), R
L
= 8Ω, R
L
connected between OUT+ and OUT-,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
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.
V
DD
to GND..............................................................................6V
PV
DD
to PGND .........................................................................6V
GND to PGND .......................................................-0.3V to +0.3V
All Other Pins to GND.................................-0.3V to (V
DD
+ 0.3V)
Continuous Current Into/Out of PV
DD
/PGND/OUT_........±600mA
Continuous Input Current (all other pins) .........................±20mA
Duration of OUT_ Short Circuit to GND or PV
DD
........Continuous
Duration of Short Circuit Between OUT+ and OUT- ..Continuous
Continuous Power Dissipation (T
A
= +70°C)
10-Pin TDFN (derate 24.4mW/°C above +70°C) .....1951.2mW
10-Pin µMAX (derate 5.6mW/
o
C above +70°C) .........444.4mW
12-Bump UCSP (derate 6.1mW/°C above +70°C)........484mW
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
Bump Temperature (soldering)
Reflow ..........................................................................+235°C
MAX9700
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
GENERAL
Supply Voltage Range V
DD
Inferred from PSRR test 2.5 5.5 V
Quiescent Current I
DD
45.2mA
Shutdown Current I
SHDN
0.1 10 µA
Turn-On Time t
ON
30 ms
Input Resistance R
IN
T
A
= +25°C 12 20 kΩ
Input Bias Voltage V
BIAS
Either input
0.73 0.83 0.93
V
MAX9700A 6
MAX9700B 12
MAX9700C
15.6
Voltage Gain A
V
MAX9700D 20
dB
T
A
= +25°C
±11 ±80
Output Offset Voltage V
OS
T
MIN
≤ T
A
≤ T
MAX
±120
mV
Common-Mode Rejection Ratio CMRR f
IN
= 1kHz, input referred 72 dB
V
DD
= 2.5V to 5.5V, T
A
= +25°C 50 70
f
RIPPLE
= 217Hz 72
Power-Supply Rejection Ratio
(Note 3)
PSRR
200mV
P-P
ripple
f
RIPPLE
= 20kHz 55
dB
R
L
= 8Ω
450
Output Power P
OUT
THD+N = 1%
R
L
= 6Ω
800
mW
R
L
= 8Ω,
P
OUT
= 125mW
0.01
Total Harmonic Distortion
Plus Noise
THD+N
f
IN
= 1kHz, either
FFM or SSM
R
L
= 6Ω,
P
OUT
= 125mW
0.01
%
MAX9700
1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= V
SHDN
= 3.3V, V
GND
= V
PGND
= 0V, SYNC = GND (FFM), R
L
= 8Ω, R
L
connected between OUT+ and OUT-,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
Note 1: All devices are 100% production tested at T
A
= +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 R
L
= 4Ω, L = 33µH.
For R
L
= 8Ω, L = 68µH. For R
L
= 16Ω, L = 136µH.
Note 3: PSRR is specified with the amplifier inputs connected to GND through C
IN
.
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
FFM 89
BW = 22Hz
to 22kHz
SSM 87
FFM 92
Signal-to-Noise Ratio SNR V
OUT
= 2V
RMS
A-weighted
SSM 90
dB
SYNC = GND 980
1100 1220
SYNC = unconnected
1280 1450 1620
Oscillator Frequency f
OSC
SYNC = V
DD
(SSM mode)
1220
±120
kHz
SYNC Frequency Lock Range 800
2000
kHz
Efficiency η P
OUT
= 500mW, f
IN
= 1kHz 94 %
DIGITAL INPUTS (SHDN, SYNC)
V
IH
2
Input Thresholds
V
IL
0.8
V
SHDN Input Leakage Current ±1µA
SYNC Input Current ±5µA
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
= V
SHDN
= 5V, V
GND
= V
PGND
= 0V, SYNC = GND (FFM), R
L
= 8Ω, R
L
connected between OUT+ and OUT-, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Quiescent Current I
DD
5.2 mA
Shutdown Current I
SHDN
0.1 µA
Common-Mode Rejection Ratio CMRR f = 1kHz, input referred 72 dB
f = 217Hz 72
Power-Supply Rejection Ratio PSRR
200mV
P-P
ripple
f = 20kHz 55
dB
R
L
= 16Ω
700
R
L
= 8Ω
1200
Output Power P
OUT
THD+N = 1%
R
L
= 6Ω
1600
mW
R
L
= 8Ω, P
OUT
= 125mW 0.015
Total Harmonic Distortion
Plus Noise
THD+N
f = 1kHz, either
FFM or SSM
R
L
= 4Ω, P
OUT
= 125mW 0.02
%
FFM
92.5
BW = 22Hz to
22kHz
SSM
90.5
FFM
95.5
Signal-to-Noise Ratio SNR
V
OUT
=
3V
RMS
A-weighted
SSM
93.5
dB
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX9700DEUB+T

Mfr. #:
Buy MAX9700DEUB+T
Manufacturer:
Maxim Integrated
Description:
Audio Amplifiers 1.2W L-EMI Filterles Class D Audio Amp
Lifecycle:
New from this manufacturer.
Delivery:
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