LT1028 datasheet(14/20 Pages) LINER

14 / 20 page

LT1028/LT1128

APPLICATI

I FOR ATIO

If CF is only used to cut noise bandwidth, a similar effect

can be achieved using the over-compensation terminal.

The Gain, Phase plot also shows that phase margin is

about 45

° at gain of 10 (20dB). The following configura-

tion has a high (

≈70%) overshoot without the 10pF

capacitor because of additional phase shift caused by the

feedback resistor – input capacitance pole. The presence

of the 10pF capacitor cancels this pole and reduces

overshoot to 5%.

Over-Compensation

The LT1028/LT1128 are equipped with a frequency over-

compensation terminal (pin 5). A capacitor connected

between pin 5 and the output will reduce noise bandwidth.

Details are shown on the Slew Rate, Gain-Bandwidth

Product vs Over-Compensation Capacitor plot. An addi-

tional benefit is increased capacitive load handling capa-

bility.

1028/1128 AI11

10pF

10k

Ω

1.1k

–

LT1028

APPLICATI

TYPICAL

Strain Gauge Signal Conditioner with Bridge Excitation

Low Noise Voltage Regulator

1028/1128 TA05

µF

REFERENCE

OUTPUT

–

LT1128

30.1k*

49.9

Ω*

15V

330

Ω

10k

ZERO

TRIM

5.0V

301k*

LT1021-5

0V TO 10V

OUTPUT

350

Ω

BRIDGE

–15V

15V

LT1028

–

–15V

LT1028

–

–15V

GAIN

TRIM

330

Ω

*RN60C FILM RESISTORS

THE LT1028’s NOISE CONTRIBUTION IS NEGLIGIBLE

COMPARED TO THE BRIDGE NOISE.

1028/1128 TA04

20V OUTPUT

–

LT1028

2.3k

PROVIDES PRE-REG

AND CURRENT

LIMITING

28V

121

Ω

330

Ω

1000pF

28V

LT317A

LT1021-10

2N6387

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