OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX9725CEBC+TG45

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS.
C1N
C1P
OUTL
SINGLE
1.5V CELL
AA OR AAA
BATTERY
OUTR
SGND PGND
MAX9725A–MAX9725D
INVERTING
CHARGE PUMP
INR
INL
V
DD
PV
SS
C2
V
SS
C3
General Description
The MAX9725A–MAX9725D fixed-gain, stereo head-
phone amplifiers are ideal for portable equipment where
board space is at a premium. The MAX9725E offers the
flexibility to adjust the gain with external input and feed-
back resistors. The MAX9725A–MAX9725E use a unique
DirectDrive 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 adjustable gain of the MAX9725E DirectDrive head-
phone amplifier allows for any gain down to -1V/V using
external resistors.
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
Features
♦ Low Quiescent Current
2.1mA (MAX9725A–MAX9725D)
2.3mA (MAX9725E)
♦ 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
♦ Adjustable Gain with External Input and Feedback
Resistors
MAX9725E: Minimum Stable Gain of -1V/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)
MAX9725
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
________________________________________________________________
Maxim Integrated Products
1
19-3465; Rev 4; 3/09
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.
EVALUATION KIT
AVAILABLE
Ordering Information
PA RT
PIN- PA CK A G E
T O P
M A RK
G A IN
( V/V)
MAX9725AEBC +TG45
12 U C S P+ ACK - 2
M AX9725AE TC+ 12 TQFN- EP*
+ AAE W
- 2
MAX9725BEBC +TG45
12 U C S P+ ACL - 1.5
UCSP is a trademark of Maxim Integrated Products, Inc.
Ordering Information continued at end of data sheet.
Note: All devices are specified over the -40°C to +85°C operating
temperature range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*
EP = Exposed pad.
Pin Configurations appear at end of data sheet.
Block Diagrams continued at end of data sheet.
MP3 Players
Cellular Phones
PDAs
Smart Phones
Portable Audio Equipment
Block Diagrams
MAX9725
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
SGND to PGND .....................................................-0.3V to +0.3V
V
DD
to SGND or PGND ............................................-0.3V to +2V
V
SS
to PV
SS
...........................................................-0.3V to +0.3V
C1P to PGND..............................................-0.3V to (V
DD
+ 0.3V)
C1N to PGND............................................(PV
SS
- 0.3V) to +0.3V
V
SS
, PV
SS
to GND ....................................................+0.3V to -2V
OUTR, OUTL, INR, INL to SGND
(MAX9725A–MAX9725D)..............(V
SS
- 0.3V) to (V
DD
+ 0.3V)
OUTR, OUTL to SGND
(MAX9725E) ..................................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
INR, INL to SGND (MAX9725E)...................................-4V to +4V
SHDN to SGND or PGND.........................................-0.3V to +4V
Output Short-Circuit Current ......................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
12-Bump UCSP (derate 6.5mW/°C above +70°C)....518.8mW
12-Pin Thin QFN (derate 16.9mW/°C above +70°C) ..1349.1mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+230°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS (MAX9725A–MAX9725D)
(V
DD
= 1.5V, V
PGND
= V
SGND
= 0V, V
SHDN
= 1.5V, V
SS
= V
PVSS
, C1 = C2 = 1µF, C
IN
= 1µF, R
L
= ∞, T
A
= T
MIN
to T
MAX,
unless other-
wise noted. Typical values are at T
A
= +25°C.) (See the
Functional Diagrams.
) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
Guaranteed by PSRR test 0.9 1.8 V
Quiescent Supply Current I
DD
Both channels active 2.1 3.3 mA
T
A
= +25°C 0.6 10
Shutdown Current I
SHDN
V
SHDN
= 0V
T
A
= -40°C to +85°C30
µA
Shutdown to Full Operation t
ON
180 µs
V
IH
V
DD
= 0.9V to 1.8V 0.7 x V
DD
SHDN Thresholds
V
IL
V
DD
= 0.9V to 1.8V 0.3 x V
DD
V
SHDN Input Leakage Current I
LEAK
V
DD
= 0.9V to 1.8V (Note 2) ±1µA
CHARGE PUMP
Oscillator Frequency f
OSC
493 580 667 kHz
AMPLIFIERS
MAX9725A -2.04 -2.00 -1.96
MAX9725B -1.53 -1.5 -1.47
MAX9725C -1.02 -1.00 -0.98
Voltage Gain A
V
MAX9725D -4.08 -4.00 -3.92
V/V
Gain Match ΔA
V
±0.5 %
MAX9725A/MAX9725D ±0.3 ±1.05
MAX9725B ±0.45 ±1.58Total Output Offset Voltage V
OS
Input AC-coupled,
R
L
= 32Ω to GND,
T
A
= +25°C
MAX9725C ±0.6 ±2.1
mV
Input Resistance R
IN
15 25 35 kΩ
V
DD
= 0.9V to 1.8V, T
A
= +25°C6080
f
IN
= 1kHz 70Power-Supply Rejection Ratio PSRR
100mV
P-P
ripple
f
IN
= 20kHz 62
dB
R
L
= 32Ω 10 20
V
DD
= 1.5V
R
L
= 16Ω 25
V
DD
= 1.0V, R
L
= 32Ω 7
Output Power (Note 3) P
OUT
V
DD
= 0.9V, R
L
= 32Ω 6
mW
MAX9725
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (MAX9725A–MAX9725D) (continued)
(V
DD
= 1.5V, V
PGND
= V
SGND
= 0V, V
SHDN
= 1.5V, V
SS
= V
PVSS
, C1 = C2 = 1µF, C
IN
= 1µF, R
L
= ∞, T
A
= T
MIN
to T
MAX,
unless other-
wise noted. Typical values are at T
A
= +25°C.) (See the
Functional Diagrams.
) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
R
L
= 32Ω, P
OUT
= 12mW, f = 1kHz 0.006
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16Ω, P
OUT
= 15mW, f = 1kHz 0.015
%
BW = 22Hz to 22kHz 89
Signal-to-Noise Ratio SNR R
L
= 32Ω, P
OUT
= 12mW
A-weighted filter 92
dB
Slew Rate SR 0.2 V/µs
Maximum Capacitive Load C
L
No sustained oscillations 150 pF
Crosstalk XTALK f
IN
= 1.0kHz, R
L
= 32Ω, P
OUT
= 5mW 100 dB
Into shutdown 72.8
Click-and-Pop Level K
CP
R
L
= 32Ω, peak voltage,
A-weighted, 32 samples per
second (Note 4)
Out of shutdown 72.8
dBV
ESD Protection V
ESD
Human Body Model (OUTR, OUTL) ±8 kV
ELECTRICAL CHARACTERISTICS (MAX9725E)
(V
DD
= 1.5V, V
PGND
= V
SGND
= 0V, V
SHDN
= 1.5V, V
SS
= V
PVSS
, C1 = C2 = 1µF, C
IN
= 1µF, R
L
= 32Ω, R
F
= 60kΩ, R
IN
= 10kΩ, T
A
=
T
MIN
to T
MAX,
unless otherwise noted. Typical values are at T
A
= +25°C.) (See the
Functional Diagrams.
) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
Guaranteed by PSRR test 0.9 1.8 V
Quiescent Supply Current I
DD
Both channels active 2.3 3.7 mA
T
A
= +25°C 0.6 1
Shutdown Current I
SHDN
V
SHDN
= 0V
T
A
= -40°C to +85°C10
µA
Shutdown to Full Operation t
ON
180 µs
V
IH
V
DD
= 0.9V to 1.8V 0.7 x V
DD
SHDN Thresholds
V
IL
V
DD
= 0.9V to 1.8V 0.3 x V
DD
V
SHDN Input Leakage Current I
LEAK
V
DD
= 0.9V to 1.8V (Note 2) ±1µA
CHARGE PUMP
Oscillator Frequency f
OSC
483 592 687 kHz
AMPLIFIERS
Voltage Gain A
V
(Note 5) -6.11 -6.07 -6.00 V/V
Minimum Stable Gain ΔA
V
-1.0 V/V
Total Output Offset Voltage V
OS
Input AC-coupled, R
L
= 32Ω to GND,
T
A
= +25°C (Note 6)
±0.63 ±2.1 mV
Input Resistance R
IN
6.3 9.78 14 kΩ
INR, INL Input Leakage
Current
I
LK
±100 nA
Maximum Input Parasitic
Capacitance
C
PAR
5pF
V
DD
= 0.9V to 1.8V, T
A
= +25°C 52.9 67.8
f
IN
= 1kHz 70
Power-Supply Rejection Ratio PSRR
100mV
P-P
ripple
(Note 5)
f
IN
= 20kHz 62
dB
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX9725CEBC+TG45

Mfr. #:
Buy MAX9725CEBC+TG45
Manufacturer:
Maxim Integrated
Description:
Audio Amplifiers 1V DirectDrive Headphone Amplifier
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet