OPA627AM datasheet(8/16 Pages) TI

8 / 16 page

OPA627, 637

TYPICAL PERFORMANCE CURVES (CONT)

At TA = +25°C, and VS = ±15V, unless otherwise noted.

FIGURE 1. Circuits with Noise Gain Less than Five Require

the OPA627 for Proper Stability.

SETTLING TIME vs ERROR BAND

1500

1000

500

0.001

0.01

0.1

Error Band (%)

OPA637

G = –4

OPA627

G = –1

–

Ω

+5V

–5V

OPA627

OPA637

I 2kΩ

500

Ω

F 2kΩ

Ω

F 6pF

4pF

SETTLING TIME vs LOAD CAPACITANCE

150

200

300

400

500

Load Capacitance (pF)

Error Band:

±0.01%

OPA637

G = –4

OPA627

G = –1

APPLICATIONS INFORMATION

The OPA627 is unity-gain stable. The OPA637 may be used

to achieve higher speed and bandwidth in circuits with noise

gain greater than five. Noise gain refers to the closed-loop

gain of a circuit as if the non-inverting op amp input were

being driven. For example, the OPA637 may be used in a

non-inverting amplifier with gain greater than five, or an

inverting amplifier of gain greater than four.

When choosing between the OPA627 or OPA637, it is

important to consider the high frequency noise gain of your

circuit configuration. Circuits with a feedback capacitor

(Figure 1) place the op amp in unity noise-gain at high

frequency. These applications must use the OPA627 for

proper stability. An exception is the circuit in Figure 2,

where a small feedback capacitance is used to compensate

for the input capacitance at the op amp’s inverting input. In

this case, the closed-loop noise gain remains constant with

frequency, so if the closed-loop gain is equal to five or

greater, the OPA637 may be used.

–

Buffer

Bandwidth

Limiting

Integrator

Filter

F < 4R

Inverting Amp

G < |–4|

F < 4RI

Non-Inverting Amp

G < 5

OPA627

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