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AD1380JD Datasheet(PDF) 4 Page - Analog Devices |
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AD1380JD Datasheet(HTML) 4 Page - Analog Devices |
4 / 8 page AD1380 –4– REV. B GAIN ADJUSTMENT The gain adjust circuit consists of a 100 ppm/ °C potentiometer connected across ±V S with its slider connected through a 300 k Ω resistor to the gain adjust Pin 3 as shown in Figure 2. If no external trim adjustment is desired, Pin 5 (OFFSET ADJ) and Pin 3 (GAIN ADJ) may be left open. Figure 2. Gain Adjustment Circuit ( ±0.2% FSR) OFFSET ADJUSTMENT The zero adjust circuit consists of a 100 ppm/ °C potentiometer connected across ±V S with its slider connected through a 1.8 M Ω resistor to Comparator Input Pin 5 for all ranges. As shown in Figure 3, the tolerance of this fixed resistor is not critical, and a carbon composition type is generally adequate. Using a carbon composition resistor having a –1200 ppm/ °C tempco contributes a worst-case offset tempco of 32 LSB14 × 61 ppm/LSB14 × 1200 ppm/°C = 2.3 ppm/°C of FSR, if the OFFSET ADJ potentiometer is set at either end of its adjust- ment range. Since the maximum offset adjustment required is typically no more than ±16 LSB 14, use of a carbon composition offset summing resistor typically contributes no more than 1 ppm/ °C of FSR offset tempco. Figure 5. Timing Diagram (Binary Code 0110011101 111010) Figure 3. Offset Adjustment Circuit ( ±0.3% FSR) An alternate offset adjust circuit, which contributes negligible offset tempco if metal film resistors (tempco <100 ppm/ °C) are used, is shown in Figure 4. Figure 4. Low Tempco Zero Adjustment Circuit In either adjust circuit, the fixed resistor connected to Pin 5 should be located close to this pin to keep the pin connection runs short. Comparator Input Pin 5 is quite sensitive to external noise pickup and should be guarded by analog common. TIMING The timing diagram is shown in Figure 5. Receipt of a CON- VERT START signal sets the STATUS flag, indicating conver- sion in progress. This, in turn, removes the inhibit applied to the gated clock permitting it to run through 17 cycles. All the |
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