|
|
PDF MAX9728B Data sheet ( Hoja de datos )
| Número de pieza | MAX9728B | |
| Descripción | Stereo Headphone Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX9728B (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
19-3963; Rev 1; 7/09
EVAALVUAAILTAIOBNLEKIT
60mW, DirectDrive, Stereo
Headphone Amplifiers with Shutdown
General Description
The MAX9728A/MAX9728B stereo headphone ampli-
fiers are designed for display and notebook applica-
tions or portable equipment where board space is at a
premium. These devices use a unique, patented
DirectDrive™ architecture to produce a ground-refer-
enced output from a single supply, eliminating the need
for large DC-blocking capacitors, saving cost, board
space, and component height. The MAX9728A offers
an externally adjustable gain, while the MAX9728B has
an internally preset gain of -1.5V/V. The MAX9728A/
MAX9728B deliver up to 60mW per channel into a 32Ω
load and have low 0.02% THD+N. An 80dB at 1kHz
power-supply rejection ratio (PSRR) allows these
devices to operate from noisy digital supplies without
an additional linear regulator. Comprehensive click-
and-pop circuitry suppresses audible clicks and pops
on startup and shutdown.
The MAX9728A/MAX9728B operate from a single 4.5V
to 5.5V supply, consume only 3.5mA of supply current,
feature short-circuit and thermal-overload protection,
and are specified over the extended -40°C to +85°C
temperature range. The devices are available in tiny 12-
pin Thin QFN (3mm x 3mm x 0.8mm) and 14-pin
TSSOP packages (5mm x 4.4mm x 1.1mm).
Applications
Notebook PCs
CRT TVs
DVD Players
Multimedia Monitors
www.DataSheLeCt4DU/.PcoDmP Displays
Pin Configurations appear at end of data sheet.
Features
♦ No Bulky DC-Blocking Capacitors Required
♦ Low-Power Shutdown Mode, < 0.1µA
♦ Adjustable Gain (MAX9728A) or Fixed -1.5V/V
Gain (MAX9728B)
♦ Low 0.02% THD+N
♦ High PSRR (80dB at 1kHz) Eliminates LDO
♦ Integrated Click-and-Pop Suppression
♦ 4.5V to 5.5V Single-Supply Operation
♦ Low Quiescent Current (3.5mA)
♦ Available in Space-Saving Packages
12-Pin Thin QFN (3mm x 3mm x 0.8mm)
14-Pin TSSOP (5mm x 4.4mm x 1.1mm)
Ordering Information
PART
GAIN (V/V) PIN-PACKAGE TOP MARK
MAX9728AETC+
Adj. 12 TQFN-EP*
ABC
MAX9728AEUD+ Adj. 14 TSSOP
—
MAX9728BETC+
-1.5 12 TQFN-EP*
ABD
MAX9728BEUD+ -1.5 14 TSSOP
—
Note: All devices specified over the -40°C to +85°C operating
range.
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Block Diagrams
LEFT
AUDIO
INPUT
SHDN
RIGHT
AUDIO
INPUT
MAX9728A
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
LEFT
AUDIO
INPUT
SHDN
RIGHT
AUDIO
INPUT
MAX9728B
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
FIXED GAIN ELIMINATES
EXTERNAL RESISTOR
NETWORK
________________________________________________________________ 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.
1 page  
60mW, DirectDrive, Stereo Headphone
Amplifiers with Shutdown
Typical Operating Characteristics (continued)
(VDD = 5V, PGND = SGND = 0V, SHDN = VDD, C1 = C2 = 1µF, RL = ∞, gain = -1.5V/V (RIN = 20kΩ, RF = 30kΩ for the MAX9728A),
THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, TA = +25°C, unless otherwise noted.)
OUTPUT POWER
vs. LOAD RESISTANCE
100
90 THD+N = 10%
80
70
60
50
40
30
20
10
VDD = 5V
fIN = 1kHz
0
10
THD+N = 1%
100
LOAD RESISTANCE (Ω)
1000
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
0
RL = 32Ω
VDD = 5V
-20
-40
-60
-80
-100
-120
10
100 1k
10k
FREQUENCY (Hz)
100k
CROSSTALK vs. FREQUENCY
0
POUT = 15mW
-20 RL = 16Ω
-40
-60
LEFT TO RIGHT
-80
-100 RIGHT TO LEFT
-120
10
100 1k
10k
FREQUENCY (Hz)
100k
OUTPUT POWER vs. LOAD RESISTANCE
AND CHARGE-PUMP CAPACITOR SIZE
80
C1 = C2 = 2.2μF
70 C1 = C2 = 1μF
www.DataSheet4U.com
60
50
40
30
20
0
C1 = C2 = 0.47μF
VDD = 5V
fIN = 1kHz
THD+N = 1%
50 100 150 200 250
LOAD RESISTANCE (Ω)
300
3.50
3.45
3.40
3.35
3.30
3.25
3.20
4.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
NO LOAD INPUTS GROUND
5.0
SUPPLY VOLTAGE (V)
5.5
10
9
8
7
6
5
4
3
2
1
0
4.5
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
NO LOAD INPUTS GROUND
5.0
SUPPLY VOLTAGE (V)
5.5
_______________________________________________________________________________________ 5
5 Page 
60mW, DirectDrive, Stereo Headphone
Amplifier with Shutdown
15kΩ
220pF
LEFT
AUDIO
INPUT
1μF
STEREO
DAC
7.5kΩ
1.2nF
RIGHT
AUDIO
INPUT
1μF
1.2nF
7.5kΩ
7.5kΩ
7.5kΩ
MAX9728A
INL
OUTL
OUTR
INR
220pF
15kΩ
LINE-IN DEVICE
10kΩ
10kΩ
Figure 4. MAX9728A Line-Out Amplifier and Filter Block Configuration
www.DataSheet4U.com
10
5
MAX9728A ACTIVE FILTER GAIN
vs. FREQUENCY
RL = 10kΩ
0
-5
-10
-15
-20
-25
-30
-35
1k
10k 100k
FREQUENCY (Hz)
1M
Figure 5. Frequency Response of Active Filter of Figure 4
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX9728B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX9728A | Stereo Headphone Amplifiers | Maxim Integrated Products |
| MAX9728B | Stereo Headphone Amplifiers | 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 |