Datasheet BA728N, BA728F, BA728 Datasheet (ROHM)

1

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

•

Features

1) Can be driven from a single power supply.

2) Low power.

3) Pin layout is the same as that of the general-

purpose 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.

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Block diagram

OUT1

– IN1

+ IN1

V

EE

VCC

OUT2

– IN2

+ IN2

1

2

3

4

1

8

7

6

5

OUT1

2

– IN1

3

+ IN1

4

V

EE

5

+ IN2

6

– IN2

7

OUT2

8

V

CC

+ –

+

– +

1ch

2ch

2ch1ch

––

BA728 / BA728F

BA728N

2

Standard ICs BA728 / BA728F / BA728N

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Internal circuit configuration

+ IN – IN

Q

1

Q4 Q5

Q2

Q3

Q6

Q13

Q16

Q10

Q11

Q12

Q14

Q21

R3

R2

R6

R4

R5

R1

Q20

Q17

Q15

Q22

Q23

Q28

Q25

Q24

Q19

Q18

Q27 Q29

Q26

Q7

Q8

Q9

C1

VEE

VCC

OUT

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Absolute maximum ratings (Ta = 25°C)

Parameter Symbol

Limits

Unit

BA728 BA728F BA728N

V

CC 18 ( ± 9) 18 ( ± 9) 18 (

± 9) V

Pd 800

∗

550

∗

550

∗

mW

V

ID VCC V

V

I – 0.3 ~ + VCC V

Topr – 20 ~ + 75 – 20 ~ + 75 – 20 ~ + 75 °C Tstg – 55 ~ + 125 – 55 ~ + 125 – 55 ~ + 125 °C

V

CC VCC

– 0.3 ~ + VCC – 0.3 ~ + VCC

Power supply voltage Power dissipation Differential input voltage Common-mode input voltage Operating temperature Storage temperature

∗

Refer to Pd characteristics diagram.

∗

The values for the BA728Fare those when it is mounted on a glass epoxy PCB (50mm × 50mm × 1.6mm).

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Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = + 6V, VEE = - 6V)

Parameter Symbol Min. Typ. Max. Conditions

V

IO — 210mV

I

IO — 150nA

I

B — 10 250 nA

A

V 86 100 — dB RL ⭌ 2k

Ω

V

ICM — V

± 3.0 ± 4.5 — VR

L ⭌ 2k

Ω

CMRR 70 90 — dB

PSRR — 30 150

µ

V / V

— 0.7 — V /

µ

S

— 0.7 — MHz

CS — 120 — dB source Isource — 20 — mA sink Isink — 10 — mA

S. R.

f

T

Unit

A

V = 1, RL = 2k

Ω

V

IN

+

= 1V, VIN– = 0V

V

IN

–

= 1V, VIN+ = 0V

V

OM

4 ~ – 6 4.5 ~ – 6

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

Maximum output current

3

Standard ICs BA728 / BA728F / BA728N

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Measurement circuits

200

Ω

RS

1

Ω

VS

IC

VEE

VCC

RL

BA728 BA728F BA728N

(per circuit)

50kΩ

50Ω

V

O2

+

–

1ch

= – 200 log

1000

1

V

O1

VO2

·

Channel separation

Fig. 1 Channel separation measurement circuit

10kΩ

V

O1

+

–

2ch

~

(indicates individual channels

in the same package)

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Electrical characteristic curves

POWER DISSIPATION: Pd (mW)

AMBIENT TEMPERATURE: Ta (°C)

1200

1000

800

600

400

200

0

0 25 50 75 100 125 150

BA728

BA728N

Fig.2 Power dissipation vs. ambient

temperature

BA728F

3

2

1

0

010 20

QUIESCENT CURRENT: lQ (mA)

POWER SUPPLY VOLTAGE: V

+

(V)

Fig.3 Quiescent current vs.

power supply voltage

10

20

30

010 20

INPUT BIAS CURRENT: ld (nA)

POWER SUPPLY VOLTAGE: V

+

(V)

Fig.4 Input bias current vs.

power supply voltage

160

10 200

120

80

OPEN LOOP VOLTAGE GAIN: AV (dB)

POWER SUPPLY VOLTAGE: V

+

(V)

Fig.5 Open loop voltage gain vs.

power supply voltage

40

30

20

10

0

– 20

02040 8060

OUTPUT CURRENT: lO (mA)

AMBIENT TEMPERATURE: Ta (°C)

Fig.6 Current control characteristics

120

100

80

60

40

20

0

10M1M100k10k1k100101

OPEN LOOP VOLTAGE GAIN: AV (dB)

FREQUENCY: f (Hz)

Fig.7 Open loop voltage gain vs.

frequency

20

15

100k10k1k100 1M

10

5

0

FREQUENCY: f (Hz)

MAXIMUM OUTPUT VOLTAGE: VOM (W)

Fig.8 Maximum output voltage vs.

frequency

4

2

0

1

2

3

1

3

0

20 4030100

VIN (V)

INPUT VOLTAGE

VOUT (V)

OUTPUT VOLTAGE

TIME (µs)

Fig.9 Output response characteristics

10

5

0

– 5

– 10

0 ± 5 ± 10

MAXIMUM OUTPUT VOLTAGE: VOM (V)

POWER SUPPLY VOLTAGE: V

±

(V)

Fig.10 Maximum output voltage vs.

power supply voltage

(1)Unused circuit connections 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 (V

ICM).

4

Standard ICs BA728 / BA728F / BA728N

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Operation notes

–

+

VEE

VCC

To potential in V

ICM

Fig.11 Unused circuit connections

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External dimensions (Units: mm)

DIP8 SOP8 SIP8

BA728 BA728F BA728N

0.5 ± 0.1

3.2 ± 0.2 3.4 ± 0.3

85

14

9.3

± 0.3

6.5 ± 0.3

0.3

±

0.1

0.51Min.

2.54

0° ~ 15°

7.62

0.4 ± 0.11.27

0.15

0.3Min.

0.15 ± 0.1

0.11

6.2 ± 0.3

4.4 ± 0.2

5.0 ± 0.2

85

41

1.5 ± 0.1

10.5 ± 0.5

1

8

2.54

3.5 ± 0.5

1.3

0.8

0.6

0.3 ± 0.1

2.8 ± 0.2

19.3 ± 0.2

1.2

5.8 ± 0.2

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Electrical characteristic curve