ROHM BA728N, BA728F, BA728 Datasheet

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.

•

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

•

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

•

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).

•

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