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ADR510ARTZ-REEL7 データシート(PDF) 8 Page - Analog Devices

部品番号 ADR510ARTZ-REEL7
部品情報  1.0 V Precision Low Noise Shunt Voltage Reference
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADR510ARTZ-REEL7 データシート(HTML) 8 Page - Analog Devices

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ADR510
Rev. B | Page 8 of 12
APPLICATIONS INFORMATION
The ADR510 is a 1.0 V precision shunt voltage reference
designed to operate without an external output capacitor
between the positive terminal and the negative terminal for
stability. An external capacitor can be used for additional
filtering of the supply.
As with all shunt voltage references, an external bias resistor
(RBIAS) is required between the supply voltage and the ADR510
(see Figure 2). RBIAS sets the current that is required to pass
through the load (IL) and the ADR510 (IQ). The load and the
supply voltage can vary, thus RBIAS is chosen based on the
following conditions:
RBIAS must be small enough to supply the minimum IQ
current to the ADR510 even when the supply voltage is at
minimum value and the load current is at maximum value.
RBIAS also needs to be large enough so that IQ does not
exceed 10 mA when the supply voltage is at its maximum
value and the load current is at its minimum value.
Given these conditions, RBIAS is determined by the supply
voltage (VS), the load and operating current (IL and IQ) of the
ADR510, and the ADR510 output voltage.
Q
L
OUT
S
BIAS
I
I
V
V
R
+
=
(3)
ADJUSTABLE PRECISION VOLTAGE SOURCE
The ADR510, combined with a precision low input bias op amp
such as the AD860x, can be used to output a precise adjustable
voltage. Figure 11 illustrates implementation of this application
using the ADR510.
Output of the op amp, VOUT, is determined by the gain of
the circuit, which is completely dependent on the R2 and R1
resistors.
R1
R2
V
OUT
+
= 1
(4)
An additional capacitor in parallel with R2 can be added to
filter out high frequency noise. The value of C2 is dependent on
the value of R2.
VCC
VOUT = (1 + R2/R1)
RBIAS
ADR510
1.0V
AD860x
R2
R1
C2
(OPTIONAL)
Figure 11. Adjustable Precision Voltage Source
OUTPUT VOLTAGE TRIM
Using a mechanical or digital potentiometer, the output voltage
of the ADR510 can be trimmed ±0.5%. The circuit in Figure 12
illustrates how the output voltage can be trimmed using a
10 kΩ potentiometer. Note that trimming using other resistor
values may not produce an accurate output from the ADR510.
VCC
VOUT
RBIAS
ADR510
POT
10kΩ
R1
470kΩ
1
2
3
Figure 12. Output Voltage Trim
USING THE ADR510 WITH PRECISION DATA
CONVERTERS
The compact ADR510 and its low minimum operating current
requirement make it ideal for use in battery-powered portable
instruments, such as the AD7533 CMOS multiplying DAC, that
use precision data converters.
Figure 13 shows the ADR510 serving as an external reference to
the AD7533, a CMOS multiplying DAC. Such a DAC requires a
negative voltage input in order to provide a positive output
range. In this application, the ADR510 is supplying a −1.0 V
reference to the REF input of the AD7533.
0
1
VDD
MSB
GN
9
LSB
VOUT = 0V TO 1.0V
+
AD7533
–VDD
R2
ADR510
+
1
32
1
15
Figure 13. ADR510 as a Reference for a 10-Bit CMOS DAC (AD7533)


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