7B14-01-2 Analog Devices Inc, 7B14-01-2 Datasheet - Page 2

• Manufacturer Part Number: 7B14-01-2
• Description: MODULE NON-ISOL RTD-IN LIN PLAT
• Manufacturer: Analog Devices Inc

Specifications of 7B14-01-2

• Rohs Status: RoHS non-compliant
• Module/board Type: Analog Signal Conditioner
• For Use With/related Products: Analog I/O System

GENERAL DESCRIPTION
The 7B14 is a low cost, single-channel signal conditioning
module that interfaces, amplifies and filters input voltages from
a wide variety of two-and three-wire platinum, copper and
nickel Resistor Temperature Detectors (RTDs) and provides a
precision output of either +1 V to +5 V or 0 V to +10 V, linear
with temperature. Model 7B14 features a nonlinearity of +0.05%
maximum (Pt and Cu RTDs). RTD excitation current, three-
wire lead resistance compensation and a predictable upscale
open circuit indication provide a complete signal conditioning
solution. Rated to operate with a nominal +24 VDC supply,
Model 7B14 is mix-and-match and hot-swappable with other
7B Series input modules, so it can be inserted or removed from
any socket in the same backplane without disturbing system
power.
The three input pins of Model 7B14 are fully protected up to
+30 VDC. A 250 uA excitation current for platinum and nickel
RTDs and a 1mA excitation current for copper RTDs is
provided to create an input voltage to the 7B14. This current
also provides the upscale open circuit indication. A one-pole 3
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Figure 2
Hz filter preconditions the RTD signal prior to amplification,
provided by a low drift input amplifier. The output section
contains a two-pole low pass filter (-3 dB @ 3 Hz) and a buffer
amplifier. The two-pole output filter and subsequent buffer
ensure that a low noise, low impedance (<1Ω) signal is available
at the output to drive loads to 2 kΩ minimum.
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7B14