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AD1580
TRANSIENT RESPONSE
Many ADC and DAC converters present transient current
loads to the reference. Poor reference response can degrade
the converter’s performance.
of the device to load transients of ±50 μA.
PRECISION MICROPOWER LOW DROPOUT
REFERENCE
The circuit in Figure 24 provides an ideal solution for making
a stable voltage reference with low standby power consumption,
low input/output dropout capability, and minimum noise output.
The amplifier both buffers and optionally scales up the AD1580
output voltage, V R . Output voltages as high as 2.1 V can supply
20mV/DIV
1mV/DIV
I R = 100μA + 50μA STEP
1 mA of load current. A one-pole filter connected between the
AD1580 and the OP193 input can be used to achieve low output
noise. The nominal quiescent power consumption is 200 μW.
(a)
3V
34.8k ?
205 ?
OP193
V OUT = +1.225V
OR
I R = 100μA – 50μA STEP
(b)
AD1580
4.7μF
R3
R2
V OUT = +1.225 (1 + R2/R3)
20mV/DIV
1mV/DIV
1μs/DIV
Figure 22. Transient Settling
an increased reverse current of 50 μA. Figure 22b shows the
response when the reverse current is decreased by 50 μA.
The transients settle to 1 mV in about 3 μs.
Attempts to drive a large capacitive load (in excess of 1000 pF) may
This is due to the additional poles formed by the load capacit-
ance and the output impedance of the reference. A recommended
method of driving capacitive loads of this magnitude is shown
in Figure 20. A resistor isolates the capacitive load from the
output stage, while the capacitor provides a single-pole low-pass
filter and lowers the output noise.
Figure 24. Micropower Buffered Reference
USING THE AD1580 WITH 3 V DATA CONVERTERS
The AD1580 low output drift (50 ppm/°C) and compact submi-
niature SOT-23 package make it ideally suited for today’s high
performance converters in space critical applications.
One family of ADCs for which the AD1580 is well suited is the
AD7714-3 and AD7715-3. The AD7714/AD7715 are charge-
balancing ( ∑-?) ADCs with on-chip digital filtering intended for
the measurement of wide dynamic range, low frequency signals
such as those representing chemical, physical, or biological
processes. Figure 25 shows the AD1580 connected to the
AD7714-3/AD7715-3 for 3 V operation.
3V
2 .0 V
34.8k ?
AD7714-3 AND AD7715–3
1.8V
V IN
AD1580
REFIN(+)
REFIN(–)
R SW
5k ? (TYP)
C REF
HIGH
IMPEDANCE
>1G ?
(3pF TO 8pF)
SWITCHING
FREQUENCY DEPENDS
ON f CLKIN
C L = 0.01μF
Figure 25. Reference Circuit for the AD7714-3 and AD7715-3
10mV/DIV
50μs/DIV
Figure 23. Transient Response with Capacitive Load
Rev. F | Page 9 of 12
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