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PDF MT6905 Data sheet ( Hoja de datos )
| Número de pieza | MT6905 | |
| Descripción | 5W Filterless / Class-D Audio Amplifier | |
| Fabricantes | Maxic Technology | |
| Logotipo |  |
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MT6905
Ultra Low EMI,
5W Filterless, Class-D Audio Amplifier
DISCRIPTION
MT6905 is a 5W audio class-D amplifier. It is low
noise, filter-free with PWM architecture,
minimizing external component count, PCB area,
system cost.
The chip features very low 0.1% THD+N, high
90dB S NR, and therefore offer high quality
sound. MT6905 delivers up to 5W power into a
2Ω load with an efficiency up to 80% and 1.6W
into a 8Ω load with an efficiency up to 92%.
The MT6905 features a low-power consumption
shutdown mode. The gain of the MT6905 is
externally configurable which allows independent
gain control from multiple sourc es by summing
the signals. Output short circuit and thermal
overload prot ection prevent the devic e from
damage during fault conditions
The high efficiency and a low s hutdown current
make the MT6905 an ideal choice for both
battery-powered speakers and portable devices.
FEATURES
High output power
5W @ VDD=PVDD= 5.5 V, RL= 2Ω, THD+N
= 10%
2.5V~5.5V single supply operation
Filterless and ultra-low EMI, can work
with FM tuner without extra
Ferrit e-bead components
Less than 0.1% THD+N
Excellent Power up/down “P op sound”
suppression
Low quiescent current and low-power
shutdown current
Few external components to save the
space and cost
Over current/Short circuit and over
temperature protection
Available in SOP8 package (P b-free)
MT6905 integrat es Maxic’s unique EMI
suppression technique, can work with FM tuner
without extra Ferrite-bead components.
ORDERING INFORMATION
Part #
MT6905
Package
SOP-8
Rem arks
Tube
100/tube
APPLICATION
Mobile phone
Portable audio product
Portable media player
Personal navigation device
Video game
Cordless phone
MT6905 Rev. 1.20
www.maxictech.com
Copyright © 2011 Maxic Technology Corporation
page 1
1 page  
MT6905
Ultra Low EMI,
5W Filterless, Class-D Audio Amplifier
ELECTRICAL CHARACTERISTICS
TA = 25℃ (unless otherwise noted)
PAR AM ETER
|VOS| Output offset voltage
High-level
|IIH|
current
input
|IIL| Low-level input current
I(Q) Quiescent current
TEST CONDITIONS
Inputs AC grounded,
VDD = 2.5 V ~ 5.5 V
VDD = 5.0V, VI = 5.3 V
VDD = 5.0V, VI = –0.3 V
VDD = 5.0 V, no load
VDD = 3.6 V, no load
VDD = 2.5 V, no load
M IN
2
TYP MAX
19 mV
50 μA
5 μA
4.2
3.3 mA
2.6
I(SD)
rDSON(P)
rDSON(N)
f(sw)
AGAIN
RUP_SD
Shutdown current
Static drain-source
on-state resistance
Static drain-source
on-state resistance
Output impedance in
SHUTDOW N mode
Switching frequency
Amplifier Gain
Resistance
from
V( SD )= 0.35 V,
VDD = 3.6V
VDD = 2.5 V
VDD = 3.6 V
VDD = 5.0V
VDD = 2.5 V
VDD = 3.6 V
VDD = 5.0 V
V( SD ) = 0.35 V
VDD = 2.5 V ~5.5 V
150K/Ri
SD to VDD
1.6
0.433
0.365
0.346
0.195
0.179
0.189
>1
270
3
μA
mΩ
mΩ
kΩ
kHz
MΩ
MT6905 Rev. 1.20
www.maxictech.com
Copyright © 2011 Maxic Technology Corporation
page 5
5 Page 
Application Information
MT6905
Ultra Low EMI,
5W Filterless, Class-D Audio Amplifier
Shut down Mode
Inputs Setting
MT6905: Fully differential input
The differential input stage of the amplifier
cancels any noise that appears on both input
lines of the channel. To use the MT6905 with
a differential source, connect the positive
lead of t he audio source to the INL+/INR+
input through DC-cut capacitors (Ci) and the
negative to the INL-/INR- input through
DC-cut capacitors (Ci), as Fig.18 shows.
Ci
IN-
Ci
IN+
The MT6905 provides a shutdown mode to
reduce supply current to the absolute
minimum level during periods of non-use for
battery-power conservation. The SD input
pin should be held high during normal
operation when the amplifier is in use.
Pulling SD low causes the outputs to mute
and the amplifier to enter a low-current state.
SD pin internally has a 3MΩ resistor pull up
to VDD. So, this pin can be floating for
normal operation.
Power Supply Decoupling
Fig.18. MT6905: Differential Input
MT6905: Single-ended input
MT6905 is also can be used for single-end
operation, see Fig.19, ac ground either input
through a capacitor and apply the audio
signal to the remaining i nput, and the
unused input should be ac-grounded at the
audio source instead of at the device input
for best noise performance.
Ci
IN-
Ci
IN+
Fig.19. MT6905: Single-Ended Inputs
The MT6905 is a high-performance CMOS
audio amplifier that requires adequate power
supply decoupling to ensure the output total
harmonic distortion (THD) and PS RR are as
low as possible. At this stage it is paramount
that we acknowledge the need for separate
power supplies and grounds. Noise currents
in the output power stage need to be
returned to output noise ground and
nowhere else. Were these currents to
circulate elsewhere, they may get into the
power supply, the signal ground, etc, worse
yet, they may form a loop and radiate noise.
Any of these instances results in degraded
amplifier performance. In the layout of the
MT6905, the amplifier should offer separate
PVDD connections and PGND connections
and signal currents for the inputs, reference,
etc need to be ret urned to quite power
supply VDD and GND.
As Fig. 20 showing, optimum decoupling is
achieved by using two capacitors of different
types that target different types of noise on
MT6905 Rev. 1.20
www.maxictech.com
Copyright © 2011 Maxic Technology Corporation
page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MT6905.PDF ] | |
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