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PDF MAX9787 Data sheet ( Hoja de datos )
| Número de pieza | MAX9787 | |
| Descripción | 2.2W Stereo Audio Power Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX9787 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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19-3882; Rev 1; 1/07
2.2W Stereo Audio Power Amplifier
with Analog Volume Control
General Description
The MAX9787 combines a stereo, 2.2W audio power
amplifier with an analog volume control in a single device.
A high 90dB PSRR and low 0.01% THD+N ensures clean,
low-distortion amplification of the audio signal.
The analog volume control can be driven with a poten-
tiometer, an RC-filtered PWM source, or a DAC output.
A BEEP input allows the addition of alert signals from
the controller to the audio path.
Industry-leading, click-and-pop suppression eliminates
audible transients during power and shutdown cycles.
Other features include single-supply voltage, a shut-
down mode, logic-selectable gain, thermal-overload,
and output short-circuit protection.
The MAX9787 is offered in a space-saving, thermally
efficient, 28-pin thin QFN (5mm x 5mm x 0.8mm) pack-
age, and is specified over the extended -40°C to +85°C
temperature range.
Applications
Notebook PCs
Flat-Panel TVs
Portable DVD Players
LCD Projectors
Tablet PCs
Multimedia Monitors
PC Displays
Features
♦ Class AB, 2.2W, Stereo BTL Speaker Amplifiers
♦ Analog Volume Control
♦ BEEP Input with Glitch Filter
♦ 5V Single-Supply Operation
♦ High 90dB PSRR
♦ Low-Power Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Low 0.01% THD+N at 1kHz
♦ Short-Circuit and Thermal Protection
♦ Selectable-Gain Settings
♦ Space-Saving 28-Pin TQFN (5mm x 5mm x 0.8mm)
Ordering Information
PART
MAX9787ETI+
PIN-PACKAGE
28 TQFN-EP*
PKG CODE
T2855N-1
Note: This device is specified for over -40°C to +85°C operat-
ing temperature range.
+Denotes lead-free package.
*EP = Exposed pad.
Typical Operating Circuit
+5V
Σ
Σ
BEEP
VOLUME
MAX9787
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
SHDN 22
14 N.C.
GAIN2 23
13 N.C.
GAIN1 24
VDD 25
GND 26
MAX9787
12 VSS
11 CPVSS
10 C1N
INR 27
9 CPGND
VOL 28 *EP
8 C1P
+1 2 3 4 5 6 7
*EXPOSED PAD.
THIN QFN
________________________________________________________________ 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  
2.2W Stereo Audio Power Amplifier
with Analog Volume Control
Typical Operating Characteristics (continued)
(Measurement BW = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
VRIPPLE = 200mVP-P
-10 AV = 10.5dB
-20 OUTPUT REFERRED
-30
-40
-50
-60
-70
-80
-90
-100
10
100 1k 10k
FREQUENCY (Hz)
100k
CROSSTALK vs. FREQUENCY
0
-10
VCC = 5V
VRIPPLE = 200mVP-P
-20 RL = 4Ω
-30
-40
-50
-60
-70
-80 LEFT TO RIGHT
-90
-100 RIGHT TO LEFT
-110
-120
10 100 1k 10k
FREQUENCY (Hz)
100k
SHDN
OUT_+
AND
OUT_-
TURN-ON RESPONSE
MAX9787 toc11
5V/div
2V/div
SHDN
OUT_+
AND
OUT_-
TURN-OFF RESPONSE
MAX9787 toc12
5V/div
2V/div
OUT_+
- OUT_-
RL = 8Ω
20ms/div
100mV/div
OUT_+
- OUT_-
RL = 8Ω
20ms/div
20mV/div
18
16
14
12
10
8
6
4
2
0
4.50
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
4.75 5.00 5.25
SUPPLY VOLTAGE (V)
5.50
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
4.50
4.75 5.00 5.25
SUPPLY VOLTAGE (V)
5.50
_______________________________________________________________________________________ 5
5 Page 
2.2W Stereo Audio Power Amplifier
with Analog Volume Control
Table 3. Suggested Capacitor Manufacturers
SUPPLIER
Taiyo Yuden
TDK
PHONE
800-348-2496
807-803-6100
FAX
847-925-0899
847-390-4405
WEBSITE
www.t-yuden.com
www.component.tdk.com
Thermal-overload protection limits total power dissipa-
tion in these devices. When the junction temperature
exceeds +160°C, the thermal-protection circuitry dis-
ables the amplifier output stage. The amplifiers are
enabled once the junction temperature cools by 15°C.
This results in a pulsing output under continuous ther-
mal-overload conditions as the device heats and cools.
Power Supplies
The MAX9787 speaker amplifiers are powered from
PVDD. PVDD ranges from 4.5V to 5.5V. VSS is the nega-
tive supply of the amplifiers. Connect VSS to CPVSS. The
charge pump is powered by CPVDD. CPVDD should be
the same potential as PVDD. The charge pump inverts
the voltage at CPVDD, and the resulting voltage
appears at CPVSS. The remainder of the device is pow-
ered by VDD.
Component Selection
Input Filtering
The input capacitor (CIN), in conjunction with the ampli-
fier input resistance (RIN), forms a highpass filter that
removes the DC bias from an incoming signal (see the
Typical Operating Circuit). The AC-coupling capacitor
allows the amplifier to 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
2πRINCIN
RIN is the amplifier’s internal input resistance value
given in the Electrical Characteristics. Choose CIN such
that f-3dB is well below the lowest frequency of interest.
Setting f-3dB too high affects the amplifier’s low-fre-
quency response. Use capacitors with low-voltage
coefficient dielectrics, such as tantalum or aluminum
electrolytic. Capacitors with high-voltage coefficients,
such as ceramics, may result in increased distortion at
low frequencies.
BIAS Capacitor
BIAS is the output of the internally generated DC 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/shutdown
DC bias waveforms for the speaker amplifiers. Bypass
BIAS with a 1µF capacitor to GND.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100mΩ for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric. Table 4
lists suggested manufacturers.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability
to provide sufficient current drive, which leads to a loss
of output voltage. Increasing the value of C1 improves
load regulation and reduces the charge-pump output
resistance to an extent. See the Output Power vs. Load
Resistance graph in the Typical Operating
Characteristics. Above 2.2µF, the on-resistance of the
switches and the ESR of C1 and C2 dominate.
Output Capacitor (C2)
The output capacitor value and ESR directly affect the
ripple at CPVSS. Increasing the value of C2 reduces out-
put ripple. Likewise, decreasing the ESR of C2 reduces
both ripple and output resistance. Lower capacitance
values can be used in systems with low maximum output
power levels. See the Output Power vs. Load Resistance
graph in the Typical Operating Characteristics.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX9787.PDF ] | |
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