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AD1580 Folha de dados(PDF) 8 Page - Analog Devices

Nome de Peças AD1580
Descrição Electrónicos  1.2 V Micropower, Precision Shunt Voltage Reference
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD1580 Folha de dados(HTML) 8 Page - Analog Devices

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AD1580
Rev. F | Page 8 of 12
NOISE PERFORMANCE AND REDUCTION
The noise generated by the AD1580 is typically less than
5 µV p-p over the 0.1 Hz to 10 Hz band. Figure 17 shows the
0.1 Hz to 10 Hz noise of a typical AD1580. Noise in a 10 Hz to
10 kHz bandwidth is approximately 20 μV rms (see Figure 18a).
If further noise reduction is desired, a 1-pole low-pass filter can
be added between the output pin and ground. A time constant
of 0.2 ms has a −3 dB point at about 800 Hz and reduces the
high frequency noise to about 6.5 μV rms (see Figure 18b).
A time constant of 960 ms has a −3 dB point at 165 Hz and
reduces the high frequency noise to about 2.9 μV rms (see
Figure 18c).
1s/DIV
1µV/DIV
4.5µV p-p
Figure 17. 0.1 Hz to 10 Hz Voltage Noise
40µV/DIV
21µV rms
20µV/DIV
10µV/DIV
10ms/DIV
6.5µV rms,
τ = 0.2ms
(a)
(b)
(c)
2.90µV rms,
τ = 960ms
Figure 18. Total RMS Noise
TURN-ON TIME
Many low power instrument manufacturers are becoming
increasingly concerned with the turn-on characteristics of
components being used in their systems. Fast turn-on compo-
nents often enable the end user to keep power off when not
needed, and yet those components respond quickly when
the power is turned on for operation. Figure 19 displays the
turn-on characteristic of the AD1580.
Upon application of power (cold start), the time required for
the output voltage to reach its final value within a specified
error is the turn-on settling time. Two components normally
associated with this are time for active circuits to settle and time
for thermal gradients on the chip to stabilize. This characteristic
is generated from cold start operation and represents the true
turn-on waveform after power-up. Figure 21 shows both the
coarse and fine turn-on settling characteristics of the device;
the total settling time to within 1.0 mV is about 6 µs, and there
is no long thermal tail when the horizontal scale is expanded to
2 ms/div.
250mV/DIV
5µs/DIV
CL = 200pF
VIN
0V
2.4V
Figure 19. Turn-On Response Time
+
RS = 11.5kΩ
RL
CL
VOUT
VR
VIN
Figure 20. Turn-On, Settling, and Transient Test Circuit
Output turn-on time is modified when an external noise
reduction filter is used. When present, the time constant
of the filter dominates overall settling.
0V
VIN
2.4V
OUTPUT ERROR
1mV/DIV, 2µs/DIV
OUTPUT
0.5mV/DIV, 2ms/DIV
Figure 21. Turn-On Settling


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