LF155, LF156, LF355, LF356, LF357

SNOSBH0C – MAY 2000 – REVISED MARCH 2013

www.ti.com

Figure 46. 8-Bit D/A Converter with Symmetrical Offset Binary Operation

•

R1, R2 should be matched within ±0.05%

•

Full-scale response time: 3

μs

B1

B2

B3

B4

B5

B6

B7

B8

Comments

+9.920

1

1

1

1

1

1

1

1

Positive Full-Scale

+0.040

1

0

0

0

0

0

0

0

(+) Zero-Scale

−0.040

0

1

1

1

1

1

1

1

(

−) Zero-Scale

−9.920

0

0

0

0

0

0

0

0

Negative Full-Scale

Figure 47. Wide BW Low Noise, Low Drift Amplifier

•

Parasitic input capacitance C1

≃ (3pF for LF155, LF156 and LF357 plus any additional layout capacitance)

interacts with feedback elements and creates undesirable high frequency pole. To compensate add C2 such

that: R2 C2

≃ R1 C1.

Figure 48. Boosting the LF156 with a Current Amplifier

•

•

•

No additional phase shift added by the current amplifier

18

Submit Documentation Feedback

Copyright © 2000–2013, Texas Instruments Incorporated

Product Folder Links: LF155 LF156 LF355 LF356 LF357