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AD8230-EVAL Datasheet(PDF) 11 Page - Analog Devices

No. de pieza AD8230-EVAL
Descripción Electrónicos  16 V Rail-to-Rail, Zero-Drift, Precision Instrumentation Amplifier
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD8230-EVAL Datasheet(HTML) 11 Page - Analog Devices

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AD8230
Rev. 0 | Page 11 of 16
TEMPERATURE (
°C)
150
–50
0
50
100
0
–1
–2
–3
–4
–5
RF = 100kΩ, RG = 1kΩ
RF = 10kΩ, RG = 100Ω
Figure 30. Effect of Feedback Resistor on Offset Voltage Drift
LEVEL-SHIFTING THE OUTPUT
A reference voltage, as shown in Figure 31, can be used to level-
shift the output 1 V from midsupply. Otherwise, it is nominally
tied to midsupply. The voltage source used to level-shift the
output should have a low output impedance to avoid contribut-
ing to gain error. In addition, it should be able to source and
sink current. To minimize offset voltage, the VREF pins should be
connected either to the local ground or to a reference voltage
source that is connected to the local ground.
2
6
1
7
5
8
4
3
AD8230
VOUT
–VS
+VS
0.1
µF
RG
RF
VLEVEL-SHIFT =
(+VS +–VS)
2
± 1V
0.1
µF
Figure 31. Level-Shifting the Output
SOURCE IMPEDANCE AND INPUT SETTLING TIME
The input stage of the AD8230 consists of two actively driven,
differential switched capacitors, as described in Figure 27 and
Figure 28. Differential input signals are sampled on CSAMPLE such
that the associated parasitic capacitances, 70 pF, are balanced
between the inputs to achieve high common-mode rejection.
On each sample period (approximately 85 µs), these parasitic
capacitances must be recharged to the common-mode voltage
by the signal source impedance (10 kΩ max).
INPUT VOLTAGE RANGE
The input common-mode range of the AD8230 is rail to rail.
However, the differential input voltage range is limited to,
approximately, 750 mV. The AD8230 does not phase invert
when its inputs are overdriven.
INPUT PROTECTION
The input voltage is limited to within one diode drop beyond
the supply rails by the internal ESD protection diodes. Resistors
and low leakage diodes may be used to limit excessive, external
voltage and current from damaging the inputs, as shown in
Figure 32. Figure 34 shows an overvoltage protection circuit
between the thermocouple and the AD8230.
2
6
1
7
5
8
4
3
AD8230
VOUT
–VS
+VS
0.1
µF
200
19.1k
BAV199
–VS
+VS
2.49k
2.49k
BAV199
–VS
+VS
0.1
µF
Figure 32. Overvoltage Input Protection
POWER SUPPLY BYPASSING
A regulated dc voltage should be used to power the instrumen-
tation amplifier. Noise on the supply pins may adversely affect
performance. Bypass capacitors should be used to decouple
the amplifier.
The AD8230 has internal clocked circuitry that requires
adequate supply bypassing. A 0.1 µF capacitor should be placed
as close to each supply pin as possible. As shown in Figure 29,
a 10 µF tantalum capacitor may be used further away from
the part.
POWER SUPPLY BYPASSING FOR MULTIPLE
CHANNEL SYSTEMS
The best way to prevent clock interference in multichannel
systems is to lay out the PCB with a star node for the positive
supply and a star node for the negative supply. Each AD8230
has a pair of traces leading to the star nodes. Using such a tech-
nique, crosstalk between clocks is minimized. If laying out star
nodes is unfeasible, then use thick traces to minimize parasitic
inductance and decouple frequently along the power supply
traces. Examples are shown in Figure 33. Care and forethought
go a long way in maximizing performance.


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