LF256H Datasheet, PDF (18/32 Pages) Texas Instruments – JFET Input Operational Amplifiers

LF155, LF156, LF355, LF356, LF357
SNOSBH0C – MAY 2000 – REVISED MARCH 2013
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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
+9.920
+0.040
−0.040
−9.920
B1
B2
B3
B4
B5
B6
B7
B8
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Comments
Positive Full-Scale
(+) Zero-Scale
(−) Zero-Scale
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
18
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Product Folder Links: LF155 LF156 LF355 LF356 LF357