Precision_high_gain_differential_amplifier_low_noise

Published:2009/7/24 22:05:00 Author:Jessie | From:SeekIC

Figure 6-28 shows a MAX427 connected for differential operation. Wideband noise is 2.5 nV√Hz, offset is less than 15 μV (5-μV typical), and drift is less than 0.8 μV/℃ (0．1 μV/℃ typical). The voltage gain is 20 million when driving a 2-kΩ load to±12 V, and 12 million with a 600-Ω load to ±10 V. The MAX427 is unity-gain stable, with an 8-MHz gain-bandwidth, and a 2.5-V/μs slew rate. The decompensated MAX437 has a 60-MHz gain-bandwidth, a 15-V/μs slew rate, and is stable for closed-loop gains of five or greater. Both ICs can be operated from ±5-V supplies. Figures 6-29 and 6-30 show voltage-noise and current-noise test circuits, respectively. Figures 6-31 and 6-32 show offset-voltage adjustment circuits. Figure 6-33 shows typical offset-voltage characteristics. Figures 6-34 through 6-37 show noise characteristics. MAXIM NEW RELEASES DATA BOOK, 1994, P. 3-45.



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