OP262GSZ datasheet(14/20 Pages) AD

14 / 20 page

OP162/OP262/OP462

Rev. F | Page 14 of 20

AMBIENT TEMPERATURE (

°C)

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

0.1

0.2

120

14-LEAD SOIC

14-LEAD TSSOP

Figure 37. Maximum Power Dissipation vs. Temperature for

14-Lead Package Types

UNUSED AMPLIFIERS

It is recommended that any unused amplifiers in a dual or a

quad package be configured as a unity-gain follower with a

1 kΩ feedback resistor connected from the inverting input to

the output, and the noninverting input tied to the ground plane.

POWER-ON SETTLING TIME

The time it takes for the output of an op amp to settle after a

supply voltage is delivered can be an important consideration in

some power-up-sensitive applications. An example of this

would be in an A/D converter where the time until valid data

can be produced after power-up is important.

The OPx62 family has a rapid settling time after power-up.

Figure 38 shows the OP462 output settling times for a single-

supply voltage of VS = +5 V. The test circuit in Figure 39 was

used to find the power-on settling times for the device.

100

500ns

50mV

VS = 5V

AV = 1

RL = 10kΩ

Figure 38. Oscilloscope Photo of VS and VOUT

OP462

VOUT

0 TO +5V

SQUARE

10K

Ω

Figure 39. Test Circuit for Power-On Settling Time

CAPACITIVE LOAD DRIVE

The OP162/OP262/OP462 are high speed, extremely accurate

devices that tolerate some capacitive loading at their outputs. As

load capacitance increases, unity-gain bandwidth of an OPx62

device decreases. This also causes an increase in overshoot and

settling time for the output. Figure 41 shows an example of this

with the device configured for unity gain and driving a 10 kΩ

resistor and 300 pF capacitor placed in parallel.

By connecting a series R-C network, commonly called a

“snubber” network, from the output of the device to ground,

this ringing can be eliminated and overshoot can be

significantly reduced. Figure 40 shows how to set up the

snubber network, and Figure 42 shows the improvement in

output response with the network added.

OPx62

VIN

VOUT

Figure 40. Snubber Network Compensation for Capacitive Loads

50mV

µs

100

VS = 5V

AV = 1

CL = 300pF

RL = 10kΩ

Figure 41. A Photo of a Ringing Square Wave

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