LT1218CS8 datasheet(14/16 Pages) LINER

14 / 16 page

LT1218/LT1219

APPLICATIONS INFORMATION

compensation. The output capacitance forms a filter,

which reduces pickup from the supply and lowers the

output impedance. This additional filtering is helpful in

mixed analog/digital systems with common supplies or

systems employing switching supplies. Filtering also

reduces high frequency noise, which may be beneficial

when driving A/D converters.

Figures 7a and 7b show the outputs of the LT1218/LT1219

perturbed by a 200mVP-P 50kHz square wave added to the

positive supply. The LT1219 power supply rejection is

about ten times greater than that of the LT1218 at 50kHz.

Note the 5-to-1 scale change in the output voltage traces.

The tolerance of the external compensation capacitor is

not critical. The plots of Overshoot vs Load Current in the

Typical Performance Characteristics section illustrate the

effect of a capacitive load.

LT1218/19 • F07a

Figure 7a. LT1218 Power Supply Rejection Test

LT1218/19 • F07b

Figure 7b. LT1219 Power Supply Rejection Test

TYPICAL APPLICATIONS

Buffer for 12-Bit A/D Converter

VREF

+ IN

– IN

GND

VCC

CLK

DOUT

CS/SHDN

LTC1285

–

µP

µF

0.1

µF

0.1

µF

VIN

LT1219

LT1218/19 • TA03

High-Side Current Source

–

LT1218

RSENSE

0.2

Ω

40k

MTP23P06

ILOAD

5V < VCC < 30V

0A < ILOAD < 1A AT VCC = 5V

0mA < ILOAD < 160mA AT VCC = 30V

2N4340

VCC

100

Ω

0.0033

µF

LT1004-1.2

10k

LT1218/19 • TA04

V+

(AC)

VOUT

V+

(AC)

VOUT

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