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AD780
APPLYING THE AD780
The AD780 can be used without any external components to
100
Data Sheet
achieve specified performance. If power is supplied to Pin 2 and
Pin 4 is grounded, Pin 6 provides a 2.5 V or 3.0 V output
depending on whether Pin 8 is left unconnected or grounded.
10
A bypass capacitor of 1 μF (+V IN to GND) should be used if the
load capacitance in the application is expected to be greater
than 1 nF. The AD780 in 2.5 V mode typically draws 700 μA of
I q at 5 V. This increases by ~2 μA/V up to 36 V.
1
2
+V IN
7
NC
1 μ F
1 NC
AD780
V OUT 6
TRIM 5
R NULL
R POT
0.1
0.1 1 10 100
LOAD CAPACITOR, C1 ( μ F)
Figure 6. Compensation and Load Capacitor Combinations
3 TEMP
GND
4
NC = NO CONNECT
O/P SELECT
2.5V – NC
3.0V – GND
8
C1 and C2 also improve the settling performance of the AD780
when subjected to load transients. The improvement in noise
performance is shown in Figure 7, Figure 8, Figure 9, and
Figure 10.
AMPLIFIER GAIN = 100
Figure 5. Optional Fine-Trim Circuit
Initial error can be nulled using a single 25 k? potentiometer
connected between V OUT , TRIM, and GND. This is a coarse
trim with an adjustment range of 4%, and is only included here
for compatibility purposes with other references. A fine trim
can be implemented by inserting a large value resistor (e.g., 1
M? to
5 M?) in series with the wiper of the potentiometer (see
Figure 5). The trim range, expressed as a fraction of the output,
is simply greater than or equal to 2.1 k?/R NULL for either the
2.5 V or 3.0 V mode.
100
90
10
0%
100 μ V
1s
The external null resistor affects the overall temperature
coefficient by a factor equal to the percentage of V OUT nulled.
For example, a 1 mV (0.03%) shift in the output caused by the
0.1 TO 10Hz
Figure 7. Standalone Noise Performance
NO AMPLIFIER
trim circuit, with a 100 ppm/°C null resistor, adds less than
0.06 ppm/°C to the output drift (0.03% × 200 ppm/°C, since the
resistors internal to the AD780 also have temperature
coefficients of less than 100 ppm/°C).
NOISE PERFORMANCE
The impressive noise performance of the AD780 can be further
improved, if desired, by adding two capacitors: a load capacitor
(C1) between the output and ground, and a compensation
100
90
10
0%
20 μ V
10ms
capacitor (C2) between the TEMP pin and ground. Suitable
values are shown in Figure 6.
10Hz TO 10kHz
Figure 8. Standalone Noise Performance
Rev. F | Page 6 of 12
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