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AD1380 bảng dữ liệu(PDF) 4 Page - Analog Devices

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AD1380 bảng dữ liệu(HTML) 4 Page - Analog Devices

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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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