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MOSA
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
Mono 1.1W, Fully Differential Input Excellent PSRR, Low Voltage Operation Selectable Shutdown Logic Level
FEATURES
*PSRR at 217Hz, 80dB at 5V *Operation range: 2.5V~5.5V *Shutdown Current 0.1uA at 5V *Output power, THD+N=1% RL=8 , 1.1W at 5V, 0.4W at 3.3V, 200mW at 2.5V *Unity-gain stable *Space-saving MSOP10, enhance thermal pad
APPLICATIONS
*Portable electronic devices *PDAs *Communication headsets *Cross-reference: LM4894
DESCRIPTION
The MS6894 is a fully differential power amplifier that can drive 1.1W of continuous average power into a mono 8 bridged-tied load (BTL). Operation with 2.5V supply, it can drive 200mw into a mono 8 . The shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. The BTL configuration eliminates the need for external coupling capacitors on the output in most applications. The MS6894 is unity-gain stable and can be configured by external gain-setting resistors. The MS6894 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 MSOP10, make the MS6894 ideally suited for use in portable electronic equipments.
BLOCK DIAGRAM
VDD
7
-IN
2
+
10
Vo2
SD SD Mode BP
Shutdown control SD Mode 0 0 1 1 SD 0 1 0 1 Status Shutdown On On Shutdown
1 3
Bias
Common mode
5
+IN
4
6
Vo1
+
7
GND
REV 1.0
1
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PIN CONFIGURATION
Symbol Pin
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
Description Shutdown places the entire device in shutdown mode depending on SD Mode selection. TTL compatible input. SD Mode = 0, the device entries shutdown when SD is logic low. SD Mode = 1, the device entries shutdown when SD is logic high. Negative differential input The shutdown mode controls the shutdown logic level of the SD pin1. TTL compatible input Positive differential input Bypass is the cap to the voltage divider for internal mid-supply bias. This terminal should be connected to a 0.1-F to 10-F capacitor CBP. Negative BTL output Ground No connected Supply voltage Positive BTL output MSOP10
SD -IN SD Mode +IN BP 1 2 3 4 5 Thermal Pad 10 9 8 7 6 Vo2 VDD NC GND Vo1
SD
1
-IN SD Mode +IN BP Vo1 GND NC VDD Vo2
2 3 4 5 6 7 8 9 10
ORDERING INFORMATION
Package 10-Pin MSOP (lead free) 10-Pin MSOP (lead free) RoHS Compliance Part number MS6894MGTR MS6894MGU Packaging Marking 6894G 6894G Transport Media 3.5k Units Tape and Reel 80 Units Tube
ABSOLUTE MAXIMUM RATINGS
Symbol VDD VESD TSTG TA TJ TS RTHJA Supply voltage Electrostatic handling Storage temperature range Operating ambient temperature range Maximum junction temperature Soldering temperature, 10 seconds Thermal resistance from junction to ambient in free air MSOP10 (enhance thermal pad)
2
Parameter
Rating 6 3500 -65 to 150 -40 to 85 150 260 50
Unit V V /W
REV 1.0
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OPERATING RATINGS
Symbol VDD Supply voltage
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
Parameter
Min 2.5
Typ 5
Max 5.5
Unit V
5V ELECTRICAL CHARACTERISTICS
Ta = 25C, VDD=5V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions IQ ISHDN VSDH VSDL VSDMH VSDML PSRR THD+N S/N Po Quiescent current Shutdown current Shutdown input voltage high Shutdown input voltage low SD Mode input voltage high SD Mode input voltage low Power supply rejection ratio Total harmonic distortion plus noise Signal-to-noise ratio Output power RL=8, CBP=1uF, f=217Hz RL=8, 1.1W RL=8, 1.1W RL=8, THD+N = 1% VIN=0V, IO=0A VSHDN=0V Min 2.0 2.0 90 1.1 Typ 2.7 0.1 80 -60 0.1 103 1.3 Max 0.8 0.8 -55 0.178 Unit mA uA V V V V dB dB % dB W
3.3V ELECTRICAL CHARACTERISTICS
Ta = 25C, VDD=3.3V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions IQ ISD PSRR THD+N S/N Po Quiescent current Shutdown current Power supply rejection ratio Total harmonic distortion plus noise Signal-to-noise ratio Output power VIN=0V, IO=0A VSHDN=0V RL=8, CBP=1uF, f=217Hz RL=8, 0.4W RL=8, 0.4W RL=8, THD+N = 1% Min 90 0.4 Typ 2.4 0.1 70 -60 0.1 100 0.5 Max -55 0.178 Unit mA uA dB dB % dB W
2.5V ELECTRICAL CHARACTERISTICS
Ta = 25C, VDD=2.5V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions IQ ISD PSRR THD+N S/N Po
REV 1.0
Min 90 0.2
Typ 2.2 0.1 60 -60 0.1 98 0.28
Max -55 0.178 -
Unit mA uA dB dB % dB W
Quiescent current Shutdown current Power supply rejection ratio Total harmonic distortion plus noise Signal-to-noise ratio Output power
VIN=0V, IO=0A VSHDN=0V RL=8, CBP =1uF, f=217Hz RL=8, 0.2W RL=8, 0.2W RL=8, THD+N = 1%
3
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MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
TYPICAL PERFORMANCE CHARACTERISTICS
Ta = 25C, BW<30kHz, unless otherwise specified.
VDD=5V RL=8 Po=1.1W VDD=3.3V RL=8 Po=0.4W VDD=2.5V RL=8 Po=0.2W
THD+N (%)
THD+N (%)
FREQUENCY (Hz)
FREQUENCY (Hz)
THD+N (%)
FREQUENCY (Hz)
THD+N vs. frequency
THD+N vs. frequency
THD+N vs. frequency
f=20kHz
f=20kHz
f=20kHz
THD+N (%)
THD+N (%)
f=20Hz
f=20Hz
THD+N (%)
f=1kHz
f=1kHz
f=1kHz
f=20Hz
VDD=5V RL=8
VDD=3.3V RL=8
VDD=2.5V RL=8
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
CBP=1uF
PSRR (dB)
PSRR (dB)
VDD=5V RL=8
VDD=3.3V RL=8
PSRR (dB)
VDD=2.5V RL=8
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR vs. frequency
PSRR vs. frequency
PSRR vs. frequency
REV 1.0
4
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MOSA
VIN=0V No load
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
QUIESCENT CURRENT (mA)
SUPPLY VOLTAGE (V)
Quiescent current vs. supply voltage
REV 1.0
5
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MOSA
APPLICATION INFORMATION
Basic application example
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
20k RF1
VDD
9
1uF
VDD
0.39uF - Differential Input 20k RI1 2
-IN
+
Vo2 10 +
MCU
VDD 100k
1 3
SD SD Mode BP +IN
Bias
Common mode
RL 8
5 0.39uF + Differential Input 20k RI2 1uF 4
+
Vo1 6
-
GND
7 20k RF2
Fig.1 Shutdown Control
A audio amplifier application circuit.
The shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. Both the SD pin and the SD Mode pin are TTL compatible input. The SD Mode is logic low, the device entries shutdown when SD is logic low. The SD Mode is logic high, the device entries shutdown when SD is logic high.
Shutdown control SD Mode 0 0 1 1 SD 0 1 0 1 Status Shutdown On On Shutdown
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 / (2*RIN *CIN) Thermal pad considerations The thermal pad must be connected to ground. The package with thermal pad of the MS6894 requires special attention on thermal design. The thermal pad on the bottom of the MS6894 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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EXTERNAL DIMENSIONS
MSOP10 (Thermal Pad)
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
Thermal Pad
Dimension in mm
Symbol A A1 A2 b c D H E
Dimension in inches Min
0.032 0.002 0.030 0.006 0.005 0.114 0.185 0.114
Min
0.81 0.05 0.76 0.15 0.13 2.90 4.70 2.90
Nom
Max
1.12 0.15 0.97 0.30 0.23 3.10 5.10 3.10 0.66 6o 1.52 1.27
Nom
Max
W1
H
E
W2
e
L W1 W2
D
0.92 0.86 0.20 0.15 3.00 4.90 3.00 0.50 BASIC 0.40 0.53 0o 1.27 1.02 -
0.036 0.044 0.006 0.034 0.038 0.008 0.012 0.006 0.009 0.118 0.122 0.193 0.201 0.118 0.122 0.02 BASIC 0.016 0.021 0.026 0o 6o 0.050 0.060 0.040 0.050
A
A2 A1 e B L C
TAPE AND REEL
MSOP10
(Unit : mm)
2.0 0.30 0.05 4.0
0.05
1.5+0.1/-0.0 DIA
1.75 0.3R MAX 5.5 0.05 12.0
5.4
0.3
3.0 3.6 6.9
8.0 1.5 MIN 0.5 Radius Typical
2.0 1.7
REV 1.0
7
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MOSA
DEMO BOARD
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
2
1
3
5 4
Function description Label 1: Supply Voltage Supply voltage range is 2.5V to 5.5V, the left of jump is positive and the right of jump is negative. Label 2: Shutdown mode selection (SD Mode) The shutdown mode is low logic level shutdown mode when the jump is placed left position (SD), the SD Mode is connected to GND. On the other hand , the chip is high logic level shutdown mode when the jump is placed right position (SD), the SD Mode is connected to VDD. Label 3: Shutdown pin (SD pin) The shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. The SD Mode is placed left position (SD), the chip entries shutdown when SD pin is placed left position (L), the SD Mode is connected to GND. On the other hand, the SD Mode is placed right position (SD), the chip entries shutdown when SD pin is placed right position (H), the SD Mode is connected to VDD. Label 4: Signal Input Connected to audio signals. Label 5: Speaker Output Connected to speaker with 8ohm or 4 ohm.
REV 1.0
8
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MOSA
Circuit
J1 1 2 AVDD 0.1u AVDD C1 + C2 1u
MS6894
Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection
20K 1 2 3 J2 SD 1 2 J4 -IN 1 2 3 J3 SD Mode + C3 1u U1 + C4 0.39u R1 20K 1 2 3 4 BP 5
R2 10 9 8 7 6 LS1
SD Vo2 INVDD SDM NC IN+ GND BP Vo1 MS6894 20K R4
SPEAKER
1 2 J5 +IN
+
C5
0.39u
R3 20K
REV 1.0
9
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