OPA548 datasheet(16/36 Pages) TI

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APPLICATIONS INFORMATION

POWER SUPPLIES

INPUT PROTECTION

OPA454

V-

V+

G=1+

0.1 F

OUT

Status

Flag

E/DCom

(1)

OUT

E/D

V+

V-

-IN

+IN

LOWERING OFFSET VOLTAGE AND DRIFT

R ,1st

39.1kW

R ,1st

10kW

OPA735

V+

1stStage,+5V

V-

1stStage, 5V

R ,2nd

84.5kW

R ,2nd

10kW

OPA454

V+

2ndStage,+50V

V-

2ndStage, 50V

A ,1stStage

A ,2ndStage

2ndStage

OUT

1stStage

OUT

LOAD

10kW

LowOffset,5 V,Drift,

0.05 V/ C,Self-ZeroingOpAmp

Gain1st=4.9V/V

High-VoltageOpAmp

Gain2nd=9.45V/V

= 1V

INPUT

1stStage 4.9V,Max

OUT

2ndStage 46V(92V ),Max

OUT

V = 1V

OPA454

SBOS391 – DECEMBER 2007

Figure 57 shows the OPA454 connected as a basic

noninverting amplifier. The OPA454 can be used in

The OPA454 may be operated from power supplies

virtually any ±5V to ±50V op amp configuration. It is

up to ±50V or a total of 100V with excellent

especially useful for supply voltages greater than

performance. Most behavior remains unchanged

36V.

throughout

the

full

operating

voltage

range.

Parameters that vary significantly with operating

Power-supply terminals should be bypassed with

voltage are shown in the Typical Characteristics.

0.1

µF (or greater) capacitors, located near the

power-supply pins. Be sure that the capacitors are

Some applications do not require equal positive and

appropriately rated for the power-supply voltage

negative output voltage swing. Power-supply voltages

used.

do not need to be equal. The OPA454 can operate

with as little as 10V between the supplies and with up

to 100V between the supplies. For example, the

positive supply could be set to 90V with the negative

supply at –10V, or vice-versa (as long as the total is

less than or equal to 100V).

The

OPA454

has

increased

protection

against

damage caused by excessive voltage between op

amp input pins or input pin voltages that exceed the

power supplies; external series resistance is not

needed for protection. Internal series JFETs limit

input overload current to a non-destructive 4mA, even

with an input differential voltage as large as 120V.

Additionally, the OPA454 has dielectric isolation

between devices and the substrate. Therefore, the

amplifier is free from the limitations of junction

(1)

Pull-up resistor with at least 10

µA (choose

isolation common to many IC fabrication processes.

RP = 1MΩ with V+ = 50V for IP = 50µA).

Figure 57. Basic Noninverting Amplifier

Configuration

The OPA454 can be used with an OPA735 zero-drift

series op amp to create a high-voltage op amp circuit

that has very low input offset temperature drift. This

circuit is shown in Figure 58.

Figure 58. Two-Stage, High-Voltage Op Amp Circuit With Very Low Input Offset Temperature Drift

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