4-channel, 28-bit Inductance-to-Digital Converter with I2C for Inductive Sensing

4-channel, 28-bit Inductance-to-Digital Converter with I2C for Inductive Sensing - LDC1614


The LDC1612 and LDC1614 are 2- and 4-channel, 28-bit inductance to digital converters (LDCs) for inductive sensing solutions. With multiple channels and support for remote sensing, the LDC1612 and LDC1614 enable the performance and reliability benefits of inductive sensing to be realized at minimal cost and power. The products are easy to use, only requiring that the sensor frequency be within 1 kHz and 10 MHz to begin sensing. The wide 1 kHz to 10 MHz sensor frequency range also enables use of very small PCB coils, further reducing sensing solution cost and size.

The high resolution channels allow for a much larger sensing range, maintaining good performance beyond two coil diameters. Well-matched channels allow for differential and ratiometric measurements, which enable designers to use one channel to compensate their sensing for environmental and aging conditions such as temperature, humidity, and mechanical drift.

Given their ease of use, low power, and low system cost these products enable designers to greatly improve performance, reliability, and flexibility over existing sensing solutions and to introduce brand new sensing capabilities to products in all markets, especially consumer and industrial applications.

These devices are easily configured via an I2C interface. The two-channel LDC1612 is available in a WSON-12 package and the four-channel LDC1614 is available in a WQFN-16 package.


  • Easy-to-use – minimal configuration required
  • Measure up to 4 sensors with one IC
  • Multiple channels support environmental and aging compensation
  • Multi-channel remote sensing provides lowest system cost
  • Pin-compatible medium and high-resolution options
    • LDC1312/4: 2/4-ch 12-bit LDC
    • LDC1612/4: 2/4-ch 28-bit LDC
  • Sensing range beyond two coil diameters
  • Supports wide sensor frequency range of 1kHz to 10MHz
  • Power consumption:
    • 35 µA Low Power Sleep Mode
    • 200 nA Shutdown Mode
  • 3.3V operation
  • Support internal or external reference clock
  • Immune to DC magnetic fields and magnets

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Parametrics Compare all products in Inductance to Digital Converters

# Input Channels
L (Inductance) Resolution (Bits)
Sensor Frequency (Hz)
Rp (Parallel Resonance Impedance) Resolution (Bits)
Operating Temperature Range (C)
LDC1614 LDC1312 LDC1314 LDC1612
4    2    4    2   
I2C    I2C    I2C    I2C   
28    12    12    28   
1k to 10M    1k to 10M    1k to 10M    1k to 10M   
N/A    N/A    N/A    N/A   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
16WQFN    12WSON    16WQFN    12WSON   

Other qualified versions of LDC1614

Version Part Number Definition
Automotive LDC1614-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

WEBENCH® Designer LDC1614

 Inductive Sensing  Coil Designer
Use this tool to get started with inductive sensing coil design.
Distance (d)  cm
Resolution (r)  μm
Diameter of Target (td)  cm
Target Material (tm)
Resolution based on  Rp  L