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| MOSA MS6895 Mono 1.1W Fully Differential Power Amplifier Mono 1.1W, Fully Differential Input Excellent PSRR, Low Voltage Operation 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 SOP8, enhance thermal pad APPLICATIONS *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 8 bridged-tied load (BTL). Operation with 2.5V supply, it can drive 200mw into a mono 8 . 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 + 8 Vo2 SD BP +IN 1 Bias Common mode 4 3 5 Vo1 + 6 GND REV 1.0 1 www.mosanalog.com MOSA PIN CONFIGURATION Symbol /SD -IN +IN BP Vo1 GND VDD Vo2 Pin 1 2 3 4 5 6 7 8 MS6895 Mono 1.1W Fully Differential Power Amplifier Description Shutdown places the entire device in shutdown mode when held low. TTL compatible input. Negative differential 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 Supply voltage Positive BTL output SOP8 SD -IN +IN BP 1 2 3 4 Thermal Pad 8 7 6 5 Vo2 VDD GND Vo1 ORDERING INFORMATION Package 8-Pin SOP (lead free) 8-Pin SOP (lead free) RoHS Compliance Part number MS6895GTR MS6895GU Packaging Marking 6895G 6895G Transport Media 2.5k Units Tape and Reel 100 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 SOP8 (enhance thermal pad) Parameter Rating 6 3500 -65 to 150 -40 to 85 150 260 50 Unit V V /W REV 1.0 2 www.mosanalog.com MOSA OPERATING RATINGS Symbol VDD Supply voltage Parameter MS6895 Mono 1.1W Fully Differential Power Amplifier 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 PSRR THD+N S/N Po Quiescent current Shutdown current Shutdown input voltage high Shutdown 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 90 1.1 Typ 2.7 0.1 80 -60 0.1 103 1.3 Max 0.8 -55 0.178 Unit mA uA 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 www.mosanalog.com MOSA 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 MS6895 Mono 1.1W Fully Differential Power Amplifier 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 www.mosanalog.com MOSA VIN=0V No load MS6895 Mono 1.1W Fully Differential Power Amplifier QUIESCENT CURRENT (mA) SUPPLY VOLTAGE (V) Quiescent current vs. supply voltage REV 1.0 5 www.mosanalog.com MOSA APPLICATION INFORMATION Basic application example 20k RF1 MS6895 Mono 1.1W Fully Differential Power Amplifier VDD 7 1uF VDD 0.39uF - Differential Input 20k RI1 2 -IN + Vo2 8 + MCU 1 SD Bias Common mode RL 8 4 0.39uF + Differential Input 20k RI2 1uF 3 BP +IN + Vo1 5 - 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 / (2*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 www.mosanalog.com MOSA EXTERNAL DIMENSIONS SOP8 (Thermal Pad) MS6895 Mono 1.1W Fully Differential Power Amplifier W1 H E W2 Symbol A A1 B C D H E e L W1 W2 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 e B C TAPE AND REEL (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 0.3 5.4 3.0 3.6 6.9 8.0 1.5 MIN 0.5 Radius Typical 2.0 1.7 SOP8 REV 1.0 7 www.mosanalog.com |
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