Datasheet

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
E
O
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
• I
OUT(MAX)
≃150mA (will drive R
L
≥ 100Ω)
•
• No additional phase shift added by the current amplifier
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Product Folder Links: LF155 LF156 LF355 LF356 LF357