MOSA MS6895 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~6.5V ‧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 1/7 www.mosanalog.com MOSA MS6895 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 6.5 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 2/7 ℃/W www.mosanalog.com MOSA MS6895 Mono 1.1W Fully Differential Power Amplifier OPERATING RATINGS Symbol VDD Parameter Supply voltage Min Typ Max Unit 2.5 5 6.5 V Min Typ Max Unit 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 - 2.7 - mA 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 - mA 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 ISD Shutdown current 0.1 - uA Power supply rejection ratio VSHDN=0V RL=8Ω, CBP=1uF, f=217Hz - PSRR - 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 Po 2.5V ELECTRICAL CHARACTERISTICS Ta = 25°C, VDD=2.5V, f=1kHz, BW<30kHz, unless otherwise specified. Symbol Parameter Conditions IQ Quiescent current VIN=0V, IO=0A - 2.2 - mA ISD Shutdown current - 0.1 - uA PSRR Power supply rejection ratio VSHDN=0V RL=8Ω, CBP =1uF, f=217Hz - 60 - dB - -60 -55 dB - 0.1 0.178 % THD+N Total harmonic distortion plus noise RL=8Ω, 0.2W 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 3/7 www.mosanalog.com MOSA MS6895 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 (%) THD+N (%) VDD=2.5V RL=8Ω Po=0.2W 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 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 4/7 www.mosanalog.com MOSA MS6895 Mono 1.1W Fully Differential Power Amplifier QUIESCENT CURRENT (mA) VIN=0V No load SUPPLY VOLTAGE (V) Quiescent current vs. supply voltage REV 1 5/7 www.mosanalog.com MOSA MS6895 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 1uF Vo2 8 + Common mode Bias 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 6/7 www.mosanalog.com MOSA MS6895 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 e B C TAPE AND REEL (Unit : mm) 2.0 0.30 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 7/7 www.mosanalog.com