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 •Ground sensing small-signal amplifiers Control amplifiers requiring high phase margin, such as motor drivers Amplifiers operated on low voltages Capacitive loaded amplifiers •1)Features Can be driven from a single power supply. 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. 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 •Block diagram BA728 / BA728F OUT1 1 – IN1 2 – + IN1 3 VEE 4 1ch + 8 VCC 7 OUT2 6 – IN2 5 + IN2 2ch + – 2ch 2 3 4 5 6 7 8 – IN1 + IN1 VEE + IN2 – IN2 OUT2 VCC – 1 – OUT1 1ch + + BA728N 1 Standard ICs BA728 / BA728F / BA728N •Internal circuit configuration OUT VCC Q13 R5 Q16 Q18 Q19 Q6 Q24 Q27 Q29 C1 Q25 Q15 Q7 Q3 R1 + IN – IN Q2 R2 R4 Q17 Q8 Q20 R3 Q28 Q23 Q10 Q1 Q4 Q9 Q5 Q11 Q12 Q22 R6 Q21 Q26 Q14 VEE •Absolute maximum ratings (Ta = 25°C) Parameter Limits Symbol BA728 BA728F BA728N Unit Power supply voltage VCC 18 ( ± 9) 18 ( ± 9) 18 ( ± 9) V Power dissipation Pd 800∗ 550∗ 550∗ mW Differential input voltage VID VCC VCC VCC V – 0.3 ~ + VCC – 0.3 ~ + VCC – 0.3 ~ + VCC V Operating temperature Topr – 20 ~ + 75 – 20 ~ + 75 – 20 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 – 55 ~ + 125 – 55 ~ + 125 °C VI Common-mode input voltage ∗ Refer to Pd characteristics diagram. ∗ The values for the BA728Fare those when it is mounted on a glass epoxy PCB (50mm × 50mm × 1.6mm). •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter = + 6V, VEE = - 6V) Symbol Min. Typ. Max. Unit Input offset voltage VIO — 2 10 mV Input offset current IIO — 1 50 nA Input bias current IB — 10 250 nA High-amplitude voltage gain AV 86 100 — dB Common-mode input voltage VICM 4 ~ – 6 4.5 ~ – 6 — V VOM Conditions RL ⭌ 2kΩ ± 3.0 ± 4.5 — V Common mode rejection ratio CMRR 70 90 — dB Power supply voltage rejection ratio PSRR — 30 150 µV / V Slew rate S. R. — 0.7 — V / µS Maximum frequency fT — 0.7 — MHz Channel separation CS — 120 — dB Isource — 20 — mA VIN+ = 1V, VIN– = 0V Isink — 10 — mA VIN– = 1V, VIN+ = 0V Maximum output voltage source Maximum output current 2 sink RL ⭌ 2kΩ AV = 1, RL = 2kΩ Standard ICs BA728 / BA728F / BA728N •Measurement circuits VCC IC 50kΩ 200 Ω VS RS 1Ω BA728 BA728F BA728N 10kΩ 10kΩ – 50Ω RL RS (per circuit) 1ch + VO2 Channel separation 1 VO 2 = – 200 log 1000 · VO 1 – 2ch ~ + VO 1 (indicates individual channels in the same package) VEE Fig. 1 Channel separation measurement circuit •Electrical characteristic curves 800 BA728 600 400 BA728F 200 0 0 25 50 75 100 125 2 1 0 150 INPUT BIAS CURRENT: ld (nA) 1000 BA728N 0 10 20 10 0 20 10 20 AMBIENT TEMPERATURE: Ta (°C) POWER SUPPLY VOLTAGE: V + (V) POWER SUPPLY VOLTAGE: V + (V) Fig.2 Power dissipation vs. ambient temperature Fig.3 Quiescent current vs. power supply voltage Fig.4 Input bias current vs. power supply voltage 40 120 80 0 10 20 120 OPEN LOOP VOLTAGE GAIN: AV (dB) OUTPUT CURRENT: lO (mA) 160 OPEN LOOP VOLTAGE GAIN: AV (dB) 30 3 QUIESCENT CURRENT: lQ (mA) POWER DISSIPATION: Pd (mW) 1200 30 20 10 0 – 20 0 20 40 60 80 POWER SUPPLY VOLTAGE: V + (V) AMBIENT TEMPERATURE: Ta (°C) Fig.5 Open loop voltage gain vs. power supply voltage Fig.6 Current control characteristics 100 80 60 40 20 0 1 10 100 1k 10k 100k 1M 10M FREQUENCY: f (Hz) Fig.7 Open loop voltage gain vs. frequency 3 Standard ICs BA728 / BA728F / BA728N •Electrical characteristic curve 10 15 10 5 0 100 1k 10k 100k 1M MAXIMUM OUTPUT VOLTAGE: VOM (V) OUTPUT VOLTAGE VOUT (V) 4 INPUT VOLTAGE VIN (V) MAXIMUM OUTPUT VOLTAGE: VOM (W) 20 3 2 1 0 3 2 1 0 0 10 FREQUENCY: f (Hz) 20 30 5 0 –5 – 10 40 ±5 0 Fig.8 Maximum output voltage vs. frequency ± 10 POWER SUPPLY VOLTAGE: V ± (V) TIME (µs) Fig.10 Maximum output voltage vs. power supply voltage Fig.9 Output response characteristics Operation notes •(1)Unused circuit connections VCC 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 VEE Fig.11 Unused circuit connections •External dimensions (Units: mm) BA728 BA728F 1.27 0.15 ± 0.1 1.5 ± 0.1 0.11 0.3 ± 0.1 0.4 ± 0.1 0.3Min. 2.8 ± 0.2 1.2 5.8 ± 0.2 4 10.5 ± 0.5 1 19.3 ± 0.2 8 1 3.5 ± 0.5 5 7.62 2.54 0.6 0.8 1.3 0.5 ± 0.1 0° ~ 15° 0.15 DIP8 4 8 4.4 ± 0.2 4 6.2 ± 0.3 1 6.5 ± 0.3 5 0.51Min. 3.2 ± 0.2 3.4 ± 0.3 8 2.54 BA728N 5.0 ± 0.2 9.3 ± 0.3 SOP8 SIP8 0.3 ± 0.1