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PDF MAX9725 Data sheet ( Hoja de datos )
| Número de pieza | MAX9725 | |
| Descripción | Stereo Headphone Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX9725 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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19-3465; Rev 0; 11/04
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
General Description
The MAX9725 fixed-gain, stereo headphone amplifier
is ideal for portable equipment where board space is at a
premium. The MAX9725 uses a unique, patented
DirectDriveTM architecture to produce a ground-referenced
output from a single supply, eliminating the need for large
DC-blocking capacitors, saving cost, board space, and
component height. Fixed gains of -2V/V (MAX9725A),
1.5V/V (MAX9725B), -1V/V (MAX9725C), and -4V/V
(MAX9725D) further reduce external component count.
The MAX9725 delivers up to 20mW per channel into a
32Ω load and achieves 0.006% THD+N. An 80dB at 1kHz
power-supply rejection ratio (PSRR) allows the MAX9725
to operate from noisy digital supplies without an additional
linear regulator. The MAX9725 includes ±8kV ESD protec-
tion on the headphone output. Comprehensive click-and-
pop circuitry suppresses audible clicks and pops at
startup and shutdown. A low-power shutdown mode
reduces supply current to 0.6µA (typ).
The MAX9725 operates from a single 0.9V to 1.8V supply,
allowing the device to be powered directly from a single
AA or AAA battery. The MAX9725 consumes only
2.1mA of supply current, provides short-circuit protection,
and is specified over the extended -40°C to +85°C tem-
perature range. The MAX9725 is available in a tiny
(1.54mm x 2.02mm x 0.6mm) 12-bump chip-scale
package (UCSP™) and a 12-pin thin QFN package
(4mm x 4mm x 0.8mm).
Applications
MP3 Players
Smart Phones
Cellular Phones
Portable Audio Equipment
PDAs
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP GAIN
MARK (V/V)
MAX9725AEBC-T* -40°C to +85°C 12 UCSP-12 ACK -2
MAX9725AETC -40°C to +85°C 12 TQFN-EP** AAEW -2
MAX9725BEBC-T* -40°C to +85°C 12 UCSP-12 ACL -1.5
MAX9725BETC -40°C to +85°C 12 TQFN-EP** AAEX -1.5
MAX9725CEBC-T* -40°C to +85°C 12 UCSP-12 ACM -1
MAX9725CETC -40°C to +85°C 12 TQFN-EP** AAEY -1
MAX9725DEBC-T* -40°C to +85°C 12 UCSP-12 ACN
MAX9725DETC -40°C to +85°C 12 TQFN-EP** AAEZ
-4
-4
*Future product—contact factory for availability.
**EP = Exposed paddle.
UCSP is a trademark of Maxim Integrated Products, Inc.
Features
♦ Low Quiescent Current (2.1mA)
♦ Single-Cell, 0.9V to 1.8V Single-Supply Operation
♦ Fixed Gain Eliminates External Feedback Network
MAX9725A: -2V/V
MAX9725B: -1.5V/V
MAX9725C: -1V/V
MAX9725D: -4V/V
♦ Ground-Referenced Outputs Eliminate DC Bias
♦ No Degradation of Low-Frequency Response Due
to Output Capacitors
♦ 20mW per Channel into 32Ω
♦ Low 0.006% THD+N
♦ High PSRR (80dB at 1kHz)
♦ Integrated Click-and-Pop Suppression
♦ Low-Power Shutdown Control
♦ Short-Circuit Protection
♦ ±8kV ESD-Protected Amplifier Outputs
♦ Available in Space-Saving Packages
12-Bump UCSP (1.54mm x 2.02mm x 0.6mm)
12-Pin Thin QFN (4mm x 4mm x 0.8mm)
Block Diagram
VDD
MAX9725
INL
SINGLE
1.5V CELL
AA OR AAA
BATTERY
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS.
OUTL
C1P
INVERTING
PVSS
CHARGE PUMP
C1N VSS
INR OUTR
SGND PGND
Pin Configurations appear at end of data sheet.
________________________________________________________________ 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  
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
Typical Operating Characteristics (continued)
(VDD = 1.5V, PGND = SGND = 0V, VSHDN = 1.5V, VSS = PVSS, C1 = C2 = 1µF, CIN = 1µF, THD+N measurement bandwidth = 22Hz
to 22kHz, TA = +25°C, unless otherwise noted.) (See the Functional Diagram.)
80
70
60
50
40
30
20
10
0
0
POWER DISSIPATION
vs. OUTPUT POWER
RL = 16Ω
RL = 32Ω
VDD = 1.5V
fIN = 1kHz
POUT = POUTL + POUTR
OUTPUTS IN-PHASE
10 20 30 40
OUTPUT POWER (mW)
50
35
30
25
20
15
10
5
0
0
POWER DISSIPATION
vs. OUTPUT POWER
RL = 16Ω
RL = 32Ω
VDD = 1V
fIN = 1kHz
POUT = POUTL + POUTR
OUTPUTS IN-PHASE
5 10 15
OUTPUT POWER (mW)
20
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
10
GAIN FLATNESS
vs. FREQUENCY
100 1k 10k
FREQUENCY (Hz)
100k
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
40
35 C1 = C2 = 2.2µF
30 C1 = C2 = 1µF
25
20
15
10 C1 = C2 = 0.68µF
5 C1 = C2 = 0.47µF
0
10 20 30
VDD = 1.5V
fIN = 1kHz
THD+N = 1%
40 50
LOAD RESISTANCE (Ω)
0
-20
-40
-60
-80
-100
-120
-140
-160
0
OUTPUT SPECTRUM
vs. FREQUENCY
fIN = 1kHz
RL = 32Ω
VOUT = -60dBV
VDD = 1.5V
5 10 15
FREQUENCY (kHz)
20
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
5.0
NO LOAD
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0.9 1.0 1.1 1.2 1.3 1.4
SUPPLY VOLTAGE (V)
1.5
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.9
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
1.1 1.3
SUPPLY VOLTAGE (V)
OUT_
1V/div
SHDN
500mV/div
1.5
EXITING SHUTDOWN
MAX9725 toc23
200µs/div
POWER-UP/-DOWN WAVEFORM
MAX9725toc24
VDD
1V/div
200ms/div
OUT_
10mV/div
_______________________________________________________________________________________ 5
5 Page 
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
System Diagram
0.9V TO 1.8V
MP3
DECODER
STEREO
DAC
0.47µF
0.47µF
1µF
1µF
1µF
SHDN VDD
INR
INL
MAX9725
C1P
OUTR
C1N
OUTL
VSS
PVSS
SGND PGND
TOP VIEW
(BUMP-SIDE DOWN)
1
A
C1N
MAX9725
23
PVSS INL
4
INR
B
PGND
SHDN
SGND
VSS
C
C1P
VDD OUTL OUTR
UCSP
Pin Configurations
TOP VIEW
SHDN PGND C1P
12 11 10
C1N 1
PVSS 2
INL 3
MAX9725
9 VDD
8 OUTL
7 OUTR
4 56
INR VSS SGND
THIN QFN
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX9725.PDF ] | |
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