Philips Semiconductors Linear Products

Product specification

LF198/LF298/LF398

Sample-and-hold amplifiers

August 31, 1994

880

FUNCTIONAL DIAGRAM

OFFSET

INPUT

LOGIC

LOGIC

REFERENCE

HOLD

CAPACITOR

OUTPUT

30k

300

3

8

7

6

5

–

+

TYPICAL APPLICATIONS

OUTPUT

INPUT

LOGIC

ANALOG INPUT

SAMPLE 5V

HOLD 0V

S/H

3

8

7

6

5

4

1

V+

V–

Ch

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNIT

Supply voltage

±18

V

Maximum power dissipation

F package

780

mW

N package

1160

mW

D package

1040

mW

Operating ambient temperature range

LF198

-55 to +125

°C

LF298

-25 to +85

°C

LF398

0 to +70

°C

Storage temperature range

-65 to +150

°C

Input voltage

Equal to

supply voltage

Logic-to-logic reference differential

+7, -30

V

Output short-circuit duration

Indefinite

Hold capacitor short-circuit duration

10

sec

Lead soldering temperature (10sec max)

300

°C

NOTES:

1. The maximum junction temperature of the LF398 is 150

°C. When operating at elevated ambient temperature, the packages must be derated

based on the thermal resistance specified.

2. Although the differential voltage may not exceed the limits given, the common-mode voltage on the logic pins must always be at least 2V

below the positive supply and 3V above the negative supply.

3. Derate above 25

°C, at the following rates:

F package at 6.2mW/

°C

N package at 9.3mW/

°C

D package at 8.3mW/

°C