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: 3μs
•
•
EO
B1
1
B2
1
B3
1
B4
1
B5
1
B6
1
B7
1
B8
1
Comments
Positive Full-Scale
(+) Zero-Scale
+9.920
+0.040
−0.040
−9.920
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
(−) Zero-Scale
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
•
IOUT(MAX)≃150mA (will drive RL≥ 100Ω)
•
•
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
TI [ TEXAS INSTRUMENTS ]
