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 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 MSOP10, enhance thermal pad ‧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 8Ω bridged-tied load (BTL). Operation with 2.5V supply, it can drive 200mw into a mono 8Ω. 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 SD SD Mode 1 3 BP 5 +IN 4 + 10 Vo2 - 6 Vo1 Common mode Bias + 7 GND REV 1 1/9 www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection PIN CONFIGURATION Symbol Pin Description SD 1 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. +IN 2 Positive differential input SD Mode 3 The shutdown mode controls the shutdown logic level of the SD pin1. TTL compatible input -IN 4 Negative differential input BP 5 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 6 Negative BTL output GND 7 Ground NC 8 No connected VDD 9 Supply voltage Vo2 10 Positive BTL output MSOP10 SD 1 10 Vo2 -IN 2 9 VDD SD Mode 3 8 NC +IN 4 7 GND BP 5 6 Vo1 Thermal Pad ORDERING INFORMATION Package Part number Packaging Marking Transport Media 10-Pin MSOP (lead free) MS6894MGTR 6894G 3.5k Units Tape and Reel 10-Pin MSOP (lead free) RoHS Compliance MS6894MGU 6894G 80 Units Tube ABSOLUTE MAXIMUM RATINGS Symbol Parameter Rating Unit 6.5 V 3500 VDD Supply voltage VESD Electrostatic handling TSTG Storage temperature range -65 to 150 V ℃ 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 MSOP10 (enhance thermal pad) 50 REV 1 2/9 ℃/W www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection 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 VSDMH SD Mode input voltage high 2.0 - - V VSDML SD Mode 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 - 0.1 - uA PSRR Power supply rejection ratio VSHDN=0V 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 Po Output power RL=8Ω, THD+N = 1% 0.4 0.5 - W Min Typ Max Unit 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 3/9 www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection 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 4/9 www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection QUIESCENT CURRENT (mA) VIN=0V No load SUPPLY VOLTAGE (V) Quiescent current vs. supply voltage REV 1 5/9 www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection APPLICATION INFORMATION Basic application example 20k RF1 VDD 1uF 9 VDD 0.39uF 20k 2 -IN - RI1 - Differential Input + MCU VDD 1 3 SD SD Mode 5 BP 4 +IN Vo2 10 + Common mode Bias RL 8Ω 100k 0.39uF + Differential Input 20k 1uF - Vo1 6 - + RI2 GND 7 20k RF2 Fig.1 A audio amplifier application circuit. Shutdown Control 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. 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 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 6/9 www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection EXTERNAL DIMENSIONS MSOP10 (Thermal Pad) Thermal Pad A A1 A2 b c D H E W1 H W2 E Symbol e L θ W1 W2 Dimension in mm Min Nom 0.81 0.05 0.76 0.15 0.13 2.90 4.70 2.90 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 - Dimension in inches Max Min 1.12 0.15 0.97 0.30 0.23 3.10 5.10 3.10 0.032 0.002 0.030 0.006 0.005 0.114 0.185 0.114 0.66 6o 1.52 1.27 Nom Max 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 D A A2 θ e A1 L B C TAPE AND REEL (Unit : mm) MSOP10 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 REV 1 7/9 www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection DEMO BOARD 2 1 3 5 4 Function description Label 1: Supply Voltage Supply voltage range is 2.5V to 6.5V, 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 8/9 www.mosanalog.com MOSA MS6894 Mono 1.1W Fully Differential Power Amplifier with Shutdown Selection Circuit J1 1 2 AVDD C1 AVDD + C2 1u 0.1u 20K U1 C4 0.39u + 1 2 3 J2 1 2 3 4 BP 5 R1 20K SD 1 2 J4 R2 SD Vo2 INVDD SDM NC IN+ GND BP Vo1 10 9 8 7 6 LS1 SPEAKER MS6894 -IN 20K 1 2 3 R4 + C3 1u J3 SD Mode J5 C5 0.39u R3 + 1 2 20K +IN REV 1 9/9 www.mosanalog.com