ADR435ARMZ Analog Devices Inc, ADR435ARMZ Datasheet - Page 18
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ADR435ARMZ
Manufacturer Part Number
ADR435ARMZ
Description
IC VREF XFET 7-18V 30MA 8-MSOP
Manufacturer
Analog Devices Inc
Series
XFET®r
Datasheet
1.ADR435BRZ-REEL7.pdf
(24 pages)
Specifications of ADR435ARMZ
Temperature Coefficient
10ppm/°C
Design Resources
Converting a Single-Ended Signal with AD7982 Differential PulSAR ADC (CN0032) Converting a Single-Ended Signal with AD7984 Differential PulSAR ADC (CN0033) Parametric Measurement Unit and Supporting Components for PAD Appls Using AD5522 and AD7685 (CN0104) Automated Calibration Technique That Reduces AD5360 Offset Voltage to Less Than 1 mV (CN0123) Integrated Device Power Supply for PAD with Output Voltage Range 0 V to 25 V (CN0130) 16 Channels of Programmable Output Span Using AD5360 (CN0131) 40 Channels of Programmable Output Span Using AD5371 (CN0149) Precision Single-Supply Differential ADC Driver for Industrial-Level Signals (CN0180)
Reference Type
Series
Voltage - Output
5V
Tolerance
±0.12%
Voltage - Input
7 ~ 18 V
Number Of Channels
1
Current - Quiescent
800µA
Current - Output
30mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Topology
Series
Input Voltage
7V To 18V
Reference Voltage
5V
Reference Voltage Tolerance
6mV
Voltage Reference Case Style
MSOP
No. Of Pins
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Cathode
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
A negative reference can easily be generated by adding a
precision operational amplifier, such as the
OP193, and configuring it as shown in Figure 36. V
virtual ground; therefore, the negative reference can be taken
directly from the output of the amplifier. The operational
amplifier must be dual supply and have low offset and rail-
to-rail capability if the negative supply voltage is close to the
reference output.
HIGH VOLTAGE FLOATING CURRENT SOURCE
The circuit in Figure 37 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.
KELVIN CONNECTION
In many portable instrumentation applications, where printed
circuit board (PCB) 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, circuit interconnects can exhibit a typical line resistance
of 0.45 mΩ/square (for example, 1 oz. Cu). 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 (V
Kelvin connection of Figure 38 overcomes the problem by
including the wiring resistance within the forcing loop of the
operational amplifier.
Figure 37. High Voltage Floating Current Source
ADR43x
GND
–V
V
4
A1
2
V
IN
DD
OUT
Figure 36. Negative Reference
ERROR
6
= R × I
6
V
OP90
OUT
ADR43x
+V
GND
V
L
2
4
DD
IN
) at the load. However, the
+V
S
–V
OP777
2N3904
–V
VISHAY
SST111
S
R
2.1kΩ
REF
L
or the
OUT
is at
Rev. H | Page 18 of 24
Because the amplifier senses the load voltage, the operational
amplifier loop control forces the output to compensate for the
wiring error and to produce the correct voltage at the load.
DUAL POLARITY REFERENCES
Dual polarity references can easily be made with an operational
amplifier and a pair of resistors. To avoid defeating the accuracy
obtained by the ADR43x, it is imperative to match the resistance
tolerance as well as the temperature coefficient of all the components.
V
IN
1µF
+10V
Figure 40. +2.5 V and −2.5 V References Using ADR435
Figure 39. +5 V and −5 V References Using ADR435
ADR43x
Figure 38. Advantage of Kelvin Connection
0.1µF
GND
V
2
4
GND
IN
V
V
2
IN
4
OUT
ADR435
GND
V
2
4
U1
6
ADR435
IN
TRIM
V
U1
OUT
V
TRIM
OP191
+
OUT
A1
6
5
DOCPROPERTY "ADI
V
5.6kΩ
5.6kΩ
IN
6
5
R
R1
R2
+2.5V
–2.5V
LW
10kΩ
5kΩ
R3
R
R1
LW
OP1177
OP1177
+10V
– 10V
V+
V
SENSE
V
FORCE
R
V–
U2
–10V
U2
OUT
OUT
L
V+
V–
10kΩ
R2
P li "
+5V
–5V