|
|
PDF MAX9718 Data sheet ( Hoja de datos )
| Número de pieza | MAX9718 | |
| Descripción | (MAX9718 / MAX9719) 1.4W Differential Audio Power Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX9718 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
|
No Preview Available !
19-3050; Rev 0; 10/03
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
General Description
The MAX9718/MAX9719 differential input audio power
amplifiers are ideal for portable audio devices with
internal speakers. The differential input structure
improves noise rejection and provides common-mode
rejection. A bridge-tied load (BTL) architecture mini-
mizes external component count, while providing high-
quality, power audio amplification. The MAX9718 is a
www.DataSheesti4nUg.lceo-mchannel amplifier while the MAX9719 is a dual-
channel amplifier for stereo systems. Both devices
deliver 1.4W continuous average power per channel to
a 4Ω load with less than 1% THD+N while operating
from a single +5V supply. The devices are available as
adjustable gain amplifiers or with internally fixed gains
of 0dB, 3dB, and 6dB to reduce component count.
A shutdown input disables the bias generator and
amplifiers and reduces quiescent current consumption
to less than 100nA. The MAX9718 shutdown input can
be set as active high or active low. These devices fea-
ture Maxim’s comprehensive click-and-pop suppres-
sion circuitry that reduces audible clicks and pops
during startup and shutdown.
The MAX9718 is pin compatible with the LM4895,
and is available in 9-bump UCSP™, 10-pin TDFN, and
10-pin µMAX packages. The MAX9719 is available in
16-pin TQFN, 16-pin TSSOP, and 16-bump UCSP pack-
ages. Both devices operate over the -40°C to +85°C
extended temperature range.
Applications
Mobile Phones
PDAs
Portable Devices
IN+
IN-
SHDN
SHDM
SINGLE SUPPLY
2.7V TO 5.5V
OUT+
OUT-
MAX9718
Features
o 2.7V to 5.5V Single-Supply Operation
o Very High -93dB PSRR at 217Hz
o 1.4W into 4Ω at 1% THD+N (per Channel)
o Differential Input
o Internal Fixed Gain to Reduce Component Count
o Adjustable Gain Option (MAX9718A/MAX9719A)
o 100nA Low-Power Shutdown Mode
o No Audible Clicks or Pops at Power-Up/Down
o Improved Performance Pin-Compatible Upgrade
to LM4895 (MAX9718D)
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
MAX9718AEBL-T* -40°C to +85°C 3 x 3 UCSP
MAX9718AETB* -40°C to +85°C 10 TDFN-EP**
MAX9718AEUB -40°C to +85°C 10 µMAX-EP**
*Future product—contact factory for availability.
**EP = Exposed paddle.
GAIN
(dB)
Adj
Adj
Adj
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
SINGLE SUPPLY
2.7V TO 5.5V
INL+ OUTL+
INL-
INR+
INR-
SHDN
OUTL-
OUTR+
MAX9719
OUTR-
________________________________________________________________ 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  
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
Typical Operating Characteristics (continued)
(VCC = 5V, CBIAS = 0.1µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
10
VCC = 5V
RL = 8Ω
www.DataSheet4U.c1omAV = 4
0.1 OUTPUT POWER = 800mW
0.01
0.001
OUTPUT POWER = 200mW
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
10
VCC = 3V
RL = 4Ω
1 AV = 2
0.1
0.01
0.001
OUTPUT POWER = 50mW
OUTPUT POWER = 250mW
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
10
VCC = 3V
RL = 4Ω
1 AV = 4
0.1 OUTPUT POWER = 175mW
0.01
0.001
OUTPUT POWER = 70mW
0.0001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
10
VCC = 3V
RL = 8Ω
1 AV = 2
0.0001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
10
VCC = 3V
RL = 8Ω
1 AV = 4
0.0001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
100
VCC = 5V
RL = 4Ω
10 AV = 2
0.1
OUTPUT POWER = 100mW
0.01
0.001
OUTPUT POWER = 250mW
0.0001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
100
VCC = 5V
RL = 4Ω
10 AV = 4
0.1 OUTPUT POWER = 50mW
0.01
0.001
OUTPUT POWER = 200mW
0.0001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
100
VCC = 5V
RL = 8Ω
10 AV = 2
1
0.1 fIN = 100Hz
fIN = 10kHz
0.01
fIN = 1kHz
0.001
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER
100
VCC = 5V
RL = 8Ω
10 AV = 4
1
0.1
0.01
0.001
0
fIN = 100Hz
fIN = 10kHz
fIN = 1kHz
0.5 1.0 1.5
OUTPUT POWER (W)
2.0
1 fIN = 1kHz
1
0.1
fIN = 100Hz
0.01
fIN = 10kHz
0.1
0.01
fIN = 100Hz
fIN = 1kHz
fIN = 10kHz
0.001
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT POWER (W)
0.001
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT POWER (W)
_______________________________________________________________________________________ 5
5 Page 
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
+1 VOUT(P-P)
RF
RF
www.DataSheet4U.com
-1
2 x VOUT(P-P)
VOUT(P-P)
Figure 1. Bridge-Tied Load Configuration
single-ended amplifiers. These capacitors can be
large, expensive, consume board space, and degrade
low-frequency performance.
Power Dissipation and Heat Sinking
Under normal operating conditions, the MAX9718/
MAX9719 dissipate a significant amount of power. The
maximum power dissipation for each package is given
in the Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
PDISSPKG(MAX)
=
TJ(MAX) −
θJA
TA
where TJ(MAX) is +150°C, TA is the ambient tempera-
ture, and θJA is the reciprocal of the derating factor in
°C/W as specified in the Absolute Maximum Ratings
section. For example, θJA of the TQFN package is
+59.2°C/W.
The increase in power delivered by the BTL configura-
tion directly results in an increase in internal power dis-
sipation over the single-ended configuration. The
maximum internal power dissipation for a given VCC
and load is given by the following equation:
PDISSPKG(MAX)
=
2VCC2
π2RL
If the internal power dissipation for a given application
exceeds the maximum allowed for a given package,
reduce power dissipation by increasing the ground
plane heat-sinking capability and the size of the traces
to the device (see the Layout and Grounding section).
Other methods for reducing power dissipation are to
reduce VCC, increase load impedance, decrease ambi-
ent temperature, reduce gain, or reduce input signal.
Thermal-overload protection limits total power dissipa-
tion in the MAX9718/MAX9719. When the junction tem-
perature exceeds +160°C, the thermal protection
INVERTING
RIN
DIFFERENTIAL
INPUT (OPTIONAL)
NONINVERTING
RIN
DIFFERENTIAL
INPUT (OPTIONAL)
MAX9718A
MAX9719A
IN-
BIAS
GENERATOR
IN+
OUT+
OUT-
Figure 2. Setting the MAX9718A/MAX9719A Gain
circuitry disables the amplifier output stage. The ampli-
fiers are enabled once the junction temperature cools
by 15°C. A pulsing output under continuous thermal
overload results as the device heats and cools.
For optimum power dissipation and heat sinking, con-
nect the exposed pad found on the µMAX, TDFN,
TQFN, and TSSOP packages to a large ground plane.
Fixed Differential Gain
The MAX9718B, MAX9718C, MAX9718D, MAX9719B,
MAX9719C, and MAX9719D feature internally fixed
gains (see the Selector Guide). This simplifies design,
decreases required footprint size, and eliminates exter-
nal gain-setting resistors. Resistors R1 and R2 shown in
the Typical Operating Circuit are used to achieve each
fixed gain.
Adjustable Differential Gain
Gain-Setting Resistors
External feedback resistors set the gain of the
MAX9718A and MAX9719A. Resistors RF and RIN
(Figure 2) set the gain of the amplifier as follows:
AV
=
RF
RIN
where AV is the desired voltage gain. Hence, an RIN of
10kΩ and an RF of 20kΩ yields a gain of 2V/V, or 6dB.
RF can be either fixed or variable, allowing the use of a
digitally controlled potentiometer to alter the gain under
software control.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MAX9718.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX971 | Ultra-Low-Power / Open-Drain / Single/Dual-Supply Comparators |  Maxim Integrated |
| MAX971 | (MAX971 - MAX984) Single/Dual-Supply Comparators | Maxim Integrated |
| MAX9710 | (MAX9710 / MAX9711) 3W Mono/Stereo BTL Audio Power Amplifiers | Maxim Integrated Products |
| MAX9712 | Class D Audio Amplifier | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |