OPA622

17

®

RECOMMENDED COMPONENTS VALUES

Table I summarizes recommended component values for

optimum flat frequency response. The recommended values

were determined with a 100

Ω load resistance and a 2pF load

capacitance. Some adjustment of circuit values may be

required, especially with higher load capacitance. According

to the behavior shown in Figure 12, the frequency response

capacitor is responsible for the first open-loop pole and a

small external capacitor for the gains +1V/V and +2V/V is

required for stable operation. The package pins, the internal

lead frame, and bond wires form a resonant circuit. A

resistor in the range of 150

Ω to 390Ω in series with all high

impedance inputs will damp the package related resonant

for the SO-package.

PLASTIC DIP

SURFACE-MOUNT

Component

+1

+2

+5

+10

–1

–2

UNITS

Component

+1

+2

+5

+10

–1

–2

UNITS

0

330

620

1600

390

470

Ω

150

240

470

820

240

300

Ω

—

330

160

180

—

—

Ω

—

240

120

91

—

—

Ω

220

0

0

0

0

0

Ω

00

0

0

0

0

Ω

330

150

56

10

200

150

Ω

270

150

47

10

160

100

Ω

2.2

1

—

—

1

1

pF

2.2

1

—

—

1

1

pF

150

150

150

150

150

150

Ω

200

150

200

200

150

150

Ω

—

—

—

—

390

240

Ω

—

—

—

—

240

150

Ω

—

—

—

—

62

62

Ω

—

—

—

—

68

68

Ω

Ring

—

—

—

—

150

150

Ω

Ring

—

—

—

—

150

150

Ω

Bandwidth

Bandwidth

170

160

140

110

135

125

MHz

200

170

160

100

180

175

MHz

220

200

170

110

150

150

MHz

250

240

230

100

250

240

MHz

TABLE I. Recommended Components Values for Optimum Frequency Performance.

FIGURE 17. Silkscreen and Test Circuit Board Layouts.