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ADR434ARMZ 数据表(PDF) 17 Page - Analog Devices

部件名 ADR434ARMZ
功能描述  Ultralow Noise XFET Voltage References with Current Sink and Source Capability
PDF  24 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADR434ARMZ 数据表(HTML) 17 Page - Analog Devices

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ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
Rev. B | Page 17 of 24
+VDD
–
VREF
GND
VIN
VOUT
ADR43x
A1
–
VDD
A1 = OP777, OP193
2
6
4
Figure 33. Negative Reference
HIGH VOLTAGE FLOATING CURRENT SOURCE
The circuit in Figure 34 can be used to generate a floating
current source with minimal self-heating. This particular
configuration can operate on high supply voltages determined
by the breakdown voltage of the N-channel JFET.
VIN
VOUT
GND
OP90
+VS
SST111
VISHAY
2N3904
RL
2.1k
Ω
–VS
ADR43x
Figure 34. High Voltage Floating Current Source
KELVIN CONNECTIONS
In many portable instrumentation applications where PC board
cost and area go hand-in-hand, circuit interconnects are very
often of dimensionally minimum width. These narrow lines can
cause large voltage drops if the voltage reference is required to
provide load currents to various functions. In fact, a circuit’s
interconnects can exhibit a typical line resistance of 0.45 mΩ/
square (1 oz. Cu, for example). Force and sense connections,
also referred to as Kelvin connections, offer a convenient
method of eliminating the effects of voltage drops in circuit
wires. Load currents flowing through wiring resistance produce
an error (VERROR = R × IL) at the load. However, the Kelvin
connection of Figure 35 overcomes the problem by including
the wiring resistance within the forcing loop of the op amp.
Because the op amp senses the load voltage, the op amp loop
control forces the output to compensate for the wiring error and
to produce the correct voltage at the load.
VIN
VOUT
GND
RLW
RL
VOUT
SENSE
VOUT
FORCE
RLW
VIN
2
6
4
ADR43x
A1 = OP191
A1
+
Figure 35. Advantage of Kelvin Connection
DUAL POLARITY REFERENCES
Dual polarity references can easily be made with an op amp and
a pair of resistors. In order not to defeat the accuracy obtained
by ADR43x, it is imperative to match the resistance tolerance as
well as the temperature coefficient of all the components.
6
2
4
5
–
10V
VIN
VIN
VOUT
GND
TRIM
R1
R2
U2
R3
V+
V–
+10V
–5V
+5V
10k
Ω
1
µF
0.1
µF
U1
ADR435
OP1177
5k
Ω
10k
Ω
Figure 36. +5 V and −5 V References Using ADR435
6
2
4
5
VIN
VOUT
GND
TRIM
R1
5.6k
Ω
U2
V+
V–
+10V
U1
ADR435
OP1177
+2.5V
–2.5V
R2
5.6k
Ω
–10V
Figure 37. +2.5 V and −2.5 V References Using ADR435



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