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8842A
Instruction Manual
5-9. TRACK/HOLD CIRCUIT
The Track/Hold (T/H) circuit presents a stable voltage to the A/D Converter during the input period of the A/D conversion cycle. The circuit also provides a gain of 100 in the
20 mV, 20Ω and 200 mA ranges, and a gain of 10 in the 200 mV dc, 200Ω, and 2000 mA dc ranges.
The T/H circuit consists of the T/H Amplifier (Figure
Figure |
The circuit operates by cycling between the track, settling, hold, and precharge configurations shown in Figure
Basic timing for the T/H circuit is provided by the A/D Converter over clock lines PC, HD1, TR1, and TR2. (See the timing diagram in Figure