Low Cost Lvdt-to-digital Converter - Analog DevicesThe AD2S93 is a complete 14-bit resolution tracking LVDT-to-
digital converter. A Type II tracking loop is employed to track
the AB input and produce a digital output equal to (AB)/
(REF/2), where REF is a fixed amplitude ac reference phase co-
herent with the AB input. This allows the measurement of any
2-, 3-, 4- and 5-wire LVDT or linear amplitude modulated in-
put. The operating frequency range is from 360 Hz to 10 kHz
with user definable bandwidth set externally within a range of
45 Hz to 1250 Hz.
The AD2S93 has a 16-bit serial output. The MSB (LOS), read
first, indicates a loss of the signal A, B, or reference inputs to the
converter or transducer. The second and third MSBs are flags
indicating whether [REF/2 (UNR) AB +REF/2 (OVR]) is
outside the linear operating range of the converter. The dis-
placement data is presented as 13-bit offset binary giving a 12-
bit operating range. LOS, OVR and UNR are pinned out on
the device, in addition a NULL flag is available which is set
when (AB) = 0. By Analog Devices, Inc.
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