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LDC1000-Q1 датащи(PDF) 10 Page - Texas Instruments

номер детали LDC1000-Q1
подробное описание детали  LDC1000-Q1 Inductance to Digital Converter
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LDC1000-Q1 датащи(HTML) 10 Page - Texas Instruments

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Distance (mm)
C001
C
Oscillator
L(d)
RP(d)
LDC1000-Q1
SLOS886B – SEPTEMBER 2014 – REVISED OCTOBER 2014
www.ti.com
Feature Description (continued)
Figure 8. Equivalent Resistance of rs in Parallel With LC Tank
RP(d) = (1 ⁄ ([rs + R(d)]) × ([Ls + L(d)]) / C
(1)
RP = (1 / rs) × (L / C)
(2)
Figure 9 shows the variation in RP as a function of distance for a 14-mm diameter PCB coil (23 turns, 4-mil trace
width, 4-mil spacing between trace,1-oz copper thickness, FR4). The target metal used is a stainless steel 2-mm
thick.
Figure 9. Typical RP versus Distance With a 14-mm PCB Coil
7.3.2 Measuring Parallel Resonance Impedance and Inductance with LDC1000-Q1
The LDC1000-Q1 device is an inductance-to-digital converter that simultaneously measures the impedance and
resonant frequency of an LC resonator. The device accomplishes this task by regulating the oscillation amplitude
in a closed-loop configuration to a constant level, while monitoring the energy dissipated by the resonator. By
monitoring the amount of power injected into the resonator, the LDC1000-Q1 device can determine the value of
RP. The device returns this value as a digital value which is inversely proportional to RP. In addition, the
LDC1000-Q1 device can also measure the oscillation frequency of the LC circuit. This frequency is used to
determine the inductance of the LC circuit. The oscillation frequency is returned as a digital value.
The LDC1000-Q1 device supports a wide range of LC combinations with oscillation frequencies ranging from 5
kHz to 5 MHz and RP ranging from 798 Ω to 3.93 MΩ. This range of RP can be viewed as the maximum input
range of an ADC. As shown in Figure 9, the range of RP is typically much smaller than maximum input range
supported by the LDC1000-Q1 device. To achieve better resolution in the desired sensing range, the LDC1000-
Q1 device offers a programmable input range through the Rp_MIN and Rp_MAX registers. See the Calculation
of Rp_Min and Rp_Max section for how to set these registers.
When the resonance impedance of the sensor, RP, drops below the programed Rp_MIN, the RP output of the
LDC will clip at the full scale output. An example occurrence of this situation is when a target comes too close to
the coil.
10
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Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: LDC1000-Q1


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