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PDF MAX9707 Data sheet ( Hoja de datos )
| Número de pieza | MAX9707 | |
| Descripción | 3-Channel 2.3W Filterless Class D Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
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19-3681; Rev 0; 12/05
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
3-Channel, 2.3W, Filterless Class D Amplifiers
with Active Crossover
General Description
The MAX9706/MAX9707 combine three high-efficiency
Class D amplifiers with an active crossover to provide
stereo highpass outputs, and a mono lowpass output.
All three channels deliver up to 2.3W at 1% THD+N per
channel into 4Ω when operating from a 5V supply.
An internal active filter processes the stereo inputs (left
and right) into stereo highpass and mono lowpass out-
puts. The crossover frequency is pin-selectable to four
different frequencies to accommodate a variety of
speaker configurations. The internal Class D amplifiers
feature low-EMI, spread-spectrum outputs. No output
filters are required.
The MAX9706 features Maxim’s patented DirectDrive™
headphone amplifier, providing ground-referenced
headphone outputs without the need for bulky DC-cou-
pling capacitors. The headphone outputs are capable
of delivering 95mW per channel into 16Ω from a 3.3V
supply, and are protected against ESD up to ±8kV.
The MAX9706/MAX9707 feature pin-programmable
gain, synchronization inputs and outputs, and a shut-
down mode that reduces supply current to less than
1µA. All amplifiers feature click-and-pop suppression
circuitry. Both devices are fully specified over the -40°C
to +85°C extended temperature range and are avail-
able in the thermally enhanced 36-pin (6mm x 6mm x
0.8mm) thin QFN package.
Applications
Notebook Audio Solutions Multimedia Monitors
2.1 Speaker Solutions
Portable DVD Players
Desktop PCs
Table-Top LCD TVs
Features
♦ Triple Class D Amplifiers Deliver 3 x 2.3W into 4Ω
♦ Internal Active Crossover Filter with Adjustable
Crossover Frequency
♦ Low-EMI, Spread-Spectrum Modulation
♦ Low 0.02% THD+N
♦ High PSRR (71dB)
♦ DirectDrive Headphone Amplifier (MAX9706)
♦ Enhanced Click-and-Pop Suppression
♦ Input and Output Modulator Synchronization
♦ Low-Power Shutdown Mode
♦ Up To 90% Efficiency
♦ Space-Saving (6mm x 6mm x 0.8mm) 36-Pin Thin
QFN Package
Ordering Information
PART
MAX9706ETX+
MAX9707ETX+
HP AMP
Yes
No
PIN-PACKAGE
36 Thin QFN
36 Thin QFN
PKG CODE
T3666N-1
T3666N-1
+Denotes lead-free package.
Note: These devices operate over the -40°C to +85°C temper-
ature range.
Functional Diagrams and Pin Configurations appear at end
of data sheet.
Block Diagram
AUDIO IN
MAX9706
FULL-RANGE
TRANSDUCERS
AUDIO IN
MAX9707
FULL-RANGE
TRANSDUCERS
FREQUENCY
SELECT
SHDN
LOW-FREQUENCY
TRANSDUCER
HEADPHONE
FREQUENCY
SELECT
SHDN
LOW-FREQUENCY
TRANSDUCER
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
www.DataSheet4U.co
3-Channel, 2.3W, Filterless Class D Amplifiers
with Active Crossover
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD = HPVDD = 5V, GND = PGND = CPGND = 0V, SHDN = VDD, GAIN1 = GAIN2 = GND (SPKR = +9dB, HP = 0dB), HPS =
GND, FS0 = FS1 = GND (800Hz), MGAIN = float (-6dB), SYNC_IN = VDD (SSM), speaker load RL connected between OUT_+ and
OUT_-, unless otherwise noted, RL = ∞. Headphone load RLH connected between HPR/HPL to GND, RLH = ∞. CBIAS = 1µF to GND,
C1 = 1µF, C2 = 1µF. TA = TMIN to TMAX, unless otherwise noted. Typical values at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
DIGITAL INPUTS (GAIN1, GAIN2, FS0, FS1, SHDN, SYNC_IN, MGAIN)
Input-Voltage High
Input-Voltage Low
Input Leakage Current
VINH
VINL
GAIN1, GAIN2, FS0, FS1, SHDN
Input Current
SYNC_IN, MGAIN
Pullup Impedance
SYNC_IN, MGAIN
DIGITAL OUTPUT (SYNC_OUT)
Output-Voltage High
VOH
IOH = 1mA
MIN TYP MAX UNITS
2V
0.8 V
±1 µA
±50 µA
200 kΩ
VDD x
0.9
V
Output-Voltage Low
VOL IOL = 1mA
VDD x
0.1
V
Note 1: All devices are 100% tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 2: Measured at 2kHz for OUTL_, OUTR_, HPL, and HPR; measured at 100Hz for OUTM_.
Note 3: PSRR is measured with the inputs AC-grounded.
Note 4: Left/right signal-path gain is defined as:
( ) ( )VOUT _+ − VOUT _−
VIN _
MONO signal-path gain is defined as:
(VOUTM + ) − (VOUTM − )
(VINL ) + (VINR )
Note 5: MONO gain offset is measured with respect to speaker-path gain.
Note 6: Speaker mode testing performed with an 8Ω resistive load in series with a 68µH inductive load connected across BTL output.
Headphone mode testing performed with a 32Ω resistive load connected between HP_ and GND. Mode transitions are controlled
by SHDN.
Note 7: Headphone-path gain is defined as:
VHP
VIN _
Note 8: Guaranteed by design only.
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
3-Channel, 2.3W, Filterless Class D Amplifiers
with Active Crossover
Typical Operating Characteristics—Headphone Mode (continued)
(VDD = PVDD = HPVDD = 5V, GND = PGND = CPGND = 0V, SHDN = VDD, GAIN1 = GAIN2 = GND (+9dB), FS0 = FS1 = GND (800Hz),
MGAIN = float (-6dB), SYNC_IN = VDD (SSM), speaker load RL connected between OUT+ and OUT-, unless otherwise noted, RL = ∞.
Headphone load RLH connected between HPR/HPL to GND. CBIAS = 1µF to GND, 1µF capacitor between C1P and C1N, CVSS = 1µF.
TA = TMIN to TMAX, unless otherwise noted. Typical values at TA = +25°C.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
VRIPPLE = 100mVP-P
INPUTS AC-GROUNDED
-20
-40
-60
RIGHT
-80
-100
-120
10
LEFT
100 1k 10k
FREQUENCY (Hz)
100k
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
40
SUPPLY VOLTAGE = IVDD + IHPVDD
30
HPS = GND
HPVDD = 3.3V
20
10
HPS = VDD
VDD = 5V
0
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
CROSSTALK vs. FREQUENCY
0
RL = 32Ω
-10 POUT = 32mW
-20
-30
-40
LEFT TO RIGHT
-50
-60
-70
-80
10
RIGHT TO LEFT
100 1k 10k
FREQUENCY (Hz)
100k
OUTPUT POWER
vs. CHARGE-PUMP CAPACITANCE
100
90 C1 = C2 = 1µF
f = 1kHz
THD+N = 1%
80 C1 = C2 = 0.47µF
70
60
50
40
C1 = C2 = 0.22µF
30
20
15 20 25 30 35 40 45 50
LOAD (Ω)
OUTPUT FREQUENCY SPECTRUM
0
VOUT = -60dBV
-20 f = 1kHz
RL = 32Ω
-40
-60
-80
-100
-120
-140
0
5 10 15
FREQUENCY (kHz)
20
TURN-ON/-OFF RESPONSE
MAX9706 toc36
2V/div
1V/div
100ms/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX9707.PDF ] | |
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