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| Standard ICs Dual operational amplifier BA728 / BA728F / BA728N The BA728, BA728F, and BA728N are ICs with two independently functioning operational amplifiers featuring internal phase compensation. These products offer a wide range of operating voltages, from 3 to 18V ( 1.5 to 9V) and are high-performance operational amplifiers which can be driven from a single power supply within the in-phase mode input range, including a negative power supply. *Applications small-signal amplifiers Ground sensing Control amplifiers requiring high phase margin, such as motor drivers Amplifiers operated on low voltages Capacitive loaded amplifiers *Featuresdriven from a single power supply. 1) Can be 2) Low power. 3) Pin layout is the same as that of the generalpurpose 4558 operational amplifier. 4) When driven from a single power supply, the power supply voltage ranges from 3 to 18V. 5) When driven from a dual power supply, the power supply voltage ranges from 1.5 to 9V. 6) Output is protected against short-circuits. 7) Output block is operated as a class AB to minimize crossover distortion. 8) Low input bias current of 10nA (typ.). 9) Each package contains two operational amplifiers. 10) Internal phase compensation provided. *Block diagram BA728 / BA728F OUT1 1 8 VCC - IN1 + IN1 2 - 3 1ch 7 OUT2 + + 2ch - 6 - IN2 VEE 4 5 + IN2 BA728N + + 1ch - - 2ch 1 2 3 4 5 6 7 OUT1 OUT2 + IN1 + IN2 - IN1 - IN2 VCC VEE 8 1 Standard ICs BA728 / BA728F / BA728N *Internal circuit configuration OUT VCC Q13 Q6 Q16 R5 Q18 Q19 Q24 Q27 Q29 Q15 R1 R2 Q17 R3 Q23 Q10 Q1 Q4 Q5 Q9 Q11 Q12 Q21 Q14 Q22 Q26 VEE R6 Q20 Q28 R4 Q25 C1 Q3 Q7 + IN - IN Q2 Q8 *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Differential input voltage Common-mode input voltage Operating temperature Storage temperature Symbol VCC Pd VID VI Topr Tstg Limits BA728 18 ( 9) 800 VCC BA728F 18 ( 9) 550 VCC BA728N 18 ( 9) 550 VCC Unit V mW V V C C - 0.3 ~ + VCC - 0.3 ~ + VCC - 0.3 ~ + VCC - 20 ~ + 75 - 55 ~ + 125 - 20 ~ + 75 - 55 ~ + 125 - 20 ~ + 75 - 55 ~ + 125 Refer to Pd characteristics diagram. The values for the BA728Fare those when it is mounted on a glass epoxy PCB (50mm x 50mm x 1.6mm). *Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = + 6V, VEE = - 6V) Parameter Input offset voltage Input offset current Input bias current High-amplitude voltage gain Common-mode input voltage Maximum output voltage Common mode rejection ratio Power supply voltage rejection ratio Slew rate Maximum frequency Channel separation source Maximum output current sink Symbol VIO IIO IB AV VICM VOM CMRR PSRR S. R. fT CS Isource Isink Min. -- -- -- 86 3.0 70 -- -- -- -- -- -- Typ. 2 1 10 100 4.5 90 30 0.7 0.7 120 20 10 Max. 10 50 250 -- -- -- -- 150 -- -- -- -- -- Unit mV nA nA dB V V dB V / V V / S MHz dB mA mA VIN+ = 1V, VIN- = 0V VIN- = 1V, VIN+ = 0V AV = 1, RL = 2k RL 2k RL 2k Conditions 4 ~ - 6 4.5 ~ - 6 2 Standard ICs BA728 / BA728F / BA728N *Measurement circuits IC VCC 50k 10k 10k VO2 Channel separation 1 VO2 = - 200 log 1000 * VO1 ~ - 200 VS RS 1 RS BA728 BA728F BA728N - RL 50 1ch + 2ch + VO1 (indicates individual channels in the same package) (per circuit) VEE Fig. 1 Channel separation measurement circuit *Electrical characteristic curves 1200 POWER DISSIPATION: Pd (mW) QUIESCENT CURRENT: lQ (mA) 3 INPUT BIAS CURRENT: ld (nA) 30 1000 BA728N 800 BA728 600 2 20 400 BA728F 200 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE: Ta (C) 1 10 0 0 10 POWER SUPPLY VOLTAGE: V + (V) 20 0 10 POWER SUPPLY VOLTAGE: V + (V) 20 Fig.2 Power dissipation vs. ambient temperature Fig.3 Quiescent current vs. power supply voltage Fig.4 Input bias current vs. power supply voltage 160 OPEN LOOP VOLTAGE GAIN: AV (dB) 40 OPEN LOOP VOLTAGE GAIN: AV (dB) 0 20 40 60 80 120 OUTPUT CURRENT: lO (mA) 100 30 80 120 20 60 40 20 10 80 0 10 POWER SUPPLY VOLTAGE: V + (V) 20 0 - 20 0 1 10 100 1k 10k 100k 1M 10M AMBIENT TEMPERATURE: Ta (C) FREQUENCY: f (Hz) Fig.5 Open loop voltage gain vs. power supply voltage Fig.6 Current control characteristics Fig.7 Open loop voltage gain vs. frequency 3 Standard ICs BA728 / BA728F / BA728N *Electrical characteristic curve 20 MAXIMUM OUTPUT VOLTAGE: VOM (W) OUTPUT VOLTAGE VOUT (V) 4 3 2 1 0 3 2 1 0 0 10 20 TIME (s) 30 40 MAXIMUM OUTPUT VOLTAGE: VOM (V) 10 15 5 10 0 5 INPUT VOLTAGE VIN (V) -5 0 100 1k 10k 100k 1M - 10 0 5 POWER SUPPLY VOLTAGE: V (V) 10 FREQUENCY: f (Hz) Fig.8 Maximum output voltage vs. frequency Fig.9 Output response characteristics Fig.10 Maximum output voltage vs. power supply voltage notes *Operationcircuit connections (1)Unused If there are any circuits which are not being used, we recommend making connections as shown in Figure 11, with the non-inverted input pin connected to the potential within the in-phase input voltage range (VICM). - To potential in VICM VCC + VEE Fig.11 Unused circuit connections *External dimensions (Units: mm) BA728 9.3 0.3 6.5 0.3 8 5 BA728F 5.0 0.2 8 6.2 0.3 4.4 0.2 5 BA728N 19.3 0.2 10.5 0.5 5.8 0.2 2.8 0.2 0.15 0.1 1 0.51Min. 4 7.62 1.2 1 3.5 0.5 2.54 8 0.6 0.8 1.3 0.3 0.1 3.2 0.2 3.4 0.3 1.5 0.1 1 4 0.3 0.1 0.11 1.27 0.4 0.1 0.3Min. 0.15 2.54 0.5 0.1 0 ~ 15 DIP8 SOP8 SIP8 4 |
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