Sampled_output_bridge_signal_conditioner

Published:2009/7/24 5:21:00 Author:Jessie | From:SeekIC

Figure 4-14 shows a bridge signal conditioner with sampled output. (This is an extension of the Fig. 4-13 circuit) Figure 4-15 shows the waveforms. Traces A, B, C, and D show the AIA output, Q1 emitter, 74C221 output, and A2 output, respectively. The strobing action is automated by a clocked sequence. Circuit on time is restricted to 250 μs, at a clock rate of about 2 Hz. This keeps average power consumption down to about 200 μA. Oscillator A1A produces a 250-μs clock pulse every 500 ms (trace A, Fig. 4-15). To calibrate, trim both zero and gain for the appropriate outputs. LINEAR TECHNOLOGY, APPLICATION NOTE 43, P. 20.



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