MOSA MS6895GU Mono 1.1w, fully differential input excellent psrr, low voltage operation Datasheet

MS6895
MOSA
Mono 1.1W Fully Differential Power Amplifier
Mono 1.1W, Fully Differential Input
Excellent PSRR, Low Voltage Operation
FEATURES
APPLICATIONS
•PSRR at 217Hz, 80dB at 5V
•Operation range: 2.5V~5.5V
•Shutdown Current 0.1uA at 5V
•Output power, THD+N=1%
RL=8Ω, 1.1W at 5V, 0.4W at 3.3V, 200mW at 2.5V
•Unity-gain stable
•Space-saving SOP8, enhance thermal pad
•Portable electronic devices
•PDAs
•Communication headsets
DESCRIPTION
The MS6895 is a fully differential power amplifier that can drive 1.1W of continuous average power into a mono 8Ω
bridged-tied load (BTL). Operation with 2.5V supply, it can drive 200mw into a mono 8Ω. The BTL configuration
eliminates the need for external coupling capacitors on the output in most applications. The MS6895 is unity-gain
stable and can be configured by external gain-setting resistors.
The MS6895 has good feature for portable equipment, these features include the fully differential input, low voltage
operation, micropower consumption shutdown mode, enhance thermal pad and small package SOP8, make the
MS6895 ideally suited for use in portable electronic equipments.
BLOCK DIAGRAM
VDD
7
-IN
2
SD
1
BP
4
+IN
3
+
8
Vo2
-
5
Vo1
Common
mode
Bias
+
6
GND
REV 1.0
1
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MS6895
MOSA
Mono 1.1W Fully Differential Power Amplifier
PIN CONFIGURATION
Symbol
Pin
Description
/SD
1
Shutdown places the entire device in shutdown mode when held low.
TTL compatible input.
-IN
2
Negative differential input
+IN
3
Positive differential input
BP
4
Bypass is the cap to the voltage divider for internal mid-supply bias.
This terminal should be connected to a 0.1-µF to 10-µF capacitor CBP.
Vo1
5
Negative BTL output
GND
6
Ground
VDD
7
Supply voltage
Vo2
8
Positive BTL output
SOP8
SD
1
8
Vo2
-IN
2
7
VDD
+IN
3
6
GND
BP
4
5
Vo1
Thermal
Pad
ORDERING INFORMATION
Package
Part number
Packaging Marking
Transport Media
8-Pin SOP (lead free)
MS6895GTR
6895G
2.5k Units Tape and Reel
8-Pin SOP (lead free)
RoHS Compliance
MS6895GU
6895G
100 Units Tube
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Rating
Unit
6
V
3500
V
VDD
Supply voltage
VESD
Electrostatic handling
TSTG
Storage temperature range
-65 to 150
℃
TA
Operating ambient temperature range
-40 to 85
℃
TJ
Maximum junction temperature
150
℃
TS
Soldering temperature, 10 seconds
260
℃
RTHJA
Thermal resistance from junction to ambient in free air
SOP8 (enhance thermal pad)
50
REV 1.0
2
℃/W
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MS6895
MOSA
Mono 1.1W Fully Differential Power Amplifier
OPERATING RATINGS
Symbol
VDD
Parameter
Supply voltage
Min
Typ
Max
Unit
2.5
5
5.5
V
Min
Typ
Max
Unit
-
2.7
-
mA
5V ELECTRICAL CHARACTERISTICS
Ta = 25°C, VDD=5V, f=1kHz, BW<30kHz, unless otherwise specified.
Symbol
Parameter
Conditions
IQ
Quiescent current
VIN=0V, IO=0A
ISHDN
Shutdown current
VSHDN=0V
-
0.1
-
uA
VSDH
Shutdown input voltage high
2.0
-
-
V
VSDL
Shutdown input voltage low
-
-
0.8
V
PSRR
Power supply rejection ratio
RL=8Ω, CBP=1uF, f=217Hz
-
80
-
dB
THD+N
Total harmonic distortion plus
noise
RL=8Ω, 1.1W
-
-60
-55
dB
-
0.1
0.178
%
S/N
Signal-to-noise ratio
RL=8Ω, 1.1W
90
103
-
dB
Po
Output power
RL=8Ω, THD+N = 1%
1.1
1.3
-
W
Min
Typ
Max
Unit
3.3V ELECTRICAL CHARACTERISTICS
Ta = 25°C, VDD=3.3V, f=1kHz, BW<30kHz, unless otherwise specified.
Symbol
Parameter
Conditions
IQ
Quiescent current
VIN=0V, IO=0A
-
2.4
-
mA
ISD
Shutdown current
VSHDN=0V
-
0.1
-
uA
PSRR
Power supply rejection ratio
RL=8Ω, CBP=1uF, f=217Hz
-
70
-
dB
THD+N
Total harmonic distortion plus
noise
RL=8, 0.4W
-
-60
-55
dB
0.1
0.178
%
S/N
Signal-to-noise ratio
RL=8Ω, 0.4W
90
100
-
dB
Output power
RL=8Ω, THD+N = 1%
0.4
0.5
-
W
Min
Typ
Max
Unit
VIN=0V, IO=0A
-
2.2
-
mA
Po
2.5V ELECTRICAL CHARACTERISTICS
Ta = 25°C, VDD=2.5V, f=1kHz, BW<30kHz, unless otherwise specified.
Symbol
Parameter
Conditions
IQ
Quiescent current
ISD
Shutdown current
VSHDN=0V
-
0.1
-
uA
PSRR
Power supply rejection ratio
RL=8Ω, CBP =1uF, f=217Hz
-
60
-
dB
THD+N
Total harmonic distortion plus
noise
RL=8Ω, 0.2W
-
-60
-55
dB
-
0.1
0.178
%
S/N
Signal-to-noise ratio
RL=8Ω, 0.2W
90
98
-
dB
Po
Output power
RL=8Ω, THD+N = 1%
0.2
0.28
-
W
REV 1.0
3
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MS6895
MOSA
Mono 1.1W Fully Differential Power Amplifier
TYPICAL PERFORMANCE CHARACTERISTICS
Ta = 25°C, BW<30kHz, unless otherwise specified.
VDD=3.3V
RL=8Ω
Po=0.4W
THD+N (%)
VDD=2.5V
RL=8Ω
Po=0.2W
THD+N (%)
THD+N (%)
VDD=5V
RL=8Ω
Po=1.1W
FREQUENCY (Hz)
FREQUENCY (Hz)
THD+N vs. frequency
THD+N vs. frequency
f=20kHz
f=20kHz
f=1kHz
f=1kHz
f=1kHz
f=20Hz
VDD=5V
RL=8Ω
f=20Hz
THD+N (%)
f=20kHz
THD+N (%)
THD+N (%)
FREQUENCY (Hz)
THD+N vs. frequency
VDD=3.3V
RL=8Ω
f=20Hz
VDD=2.5V
RL=8Ω
OUTPUT POWER (W)
OUTPUT POWER (W)
OUTPUT POWER (W)
THD+N vs. output power
THD+N vs. output power
THD+N vs. output power
CBP=1uF
CBP=1uF
VDD=5V
RL=8Ω
REV 1.0
PSRR (dB)
PSRR (dB)
PSRR (dB)
CBP=1uF
VDD=3.3V
RL=8Ω
VDD=2.5V
RL=8Ω
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR vs. frequency
PSRR vs. frequency
PSRR vs. frequency
4
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MS6895
MOSA
Mono 1.1W Fully Differential Power Amplifier
QUIESCENT CURRENT (mA)
VIN=0V
No load
SUPPLY VOLTAGE (V)
Quiescent current vs. supply voltage
REV 1.0
5
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MS6895
MOSA
Mono 1.1W Fully Differential Power Amplifier
APPLICATION INFORMATION
Basic application example
20k
RF1
VDD
1uF
7
VDD
0.39uF
20k
2
-IN
-
RI1
- Differential Input
+
MCU
0.39uF
+ Differential Input
20k
1
SD
4
BP
3
+IN
Vo2 8
+
Common
mode
Bias
1uF
RL
8Ω
-
Vo1 5
-
+
RI2
GND
6
20k
RF2
Fig.1
A audio amplifier application circuit.
External gain-setting
As shown in Fig.1, RI1 =RI2 and RF1 =RF2, the respective closed-loop gain is set at -RF/RI. It is important to match input
resistors and feedback resistors to each other. The outputs are used to drive the mono bridged-tied load (BTL).
High Pass Filter
The input capacitor CIN and resister RIN are decided the cut-off frequency of the HPF. The equation is as follows:
fcut-off = 1 / (2π*RIN *CIN)
Thermal pad considerations
The thermal pad must be connected to ground. The package with thermal pad of the MS6895 requires special attention
on thermal design. The thermal pad on the bottom of the MS6895 should be soldered down to a copper pad on the
circuit board. Heat can be conducted away from the thermal pad through the copper plane to ambient. If the copper
plane is not on the top surface of the circuit board, 9 vias of 13 mil or smaller in diameter should be used to thermally
couple the thermal pad to the bottom plane. For good thermal conduction, the vias must be plated through and solder
filled.
REV 1.0
6
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MS6895
MOSA
Mono 1.1W Fully Differential Power Amplifier
EXTERNAL DIMENSIONS
SOP8 (Thermal Pad)
Symbol
W1
H
A
A1
B
C
D
H
E
e
L
W1
W2
W2
E
Dimension in mm
Min
Max
1.35
1.75
0.10
0.25
0.33
0.51
0.19
0.25
4.80
5.00
5.80
6.20
3.80
4.00
1.27 BSC
0.40
1.27
2.159
2.413
2.159
2.413
Dimension in inch
Min
Max
0.0532 0.0688
0.0040 0.0098
0.013
0.020
0.0075 0.0098
0.1890 0.1968
0.2284 0.2440
0.1497 0.1574
0.050 BSC
0.016
0.050
0.085
0.095
0.085
0.095
D
L
A
A1
TAPE AND REEL
e
B
(Unit : mm)
2.0
0.30
C
0.05
0.05
1.5+0.1/-0.0 DIA
4.0
1.75
0.3R MAX
5.5
0.05
12.0 0.3
5.4
3.0
3.6
8.0
1.5 MIN
6.9
0.5 Radius Typical
2.0 1.7
SOP8
REV 1.0
7
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