2220 - 2276 HIGH-PERFORMANCE ACCELEROMETERS Description：

SDI’s Premium Models 2220 and 2276 High-Performance Single Axis MEMS DC Accelerometers are rugged plug-and-play measurement devices that provide enhanced performance over temperature for use in zero to medium frequency applications experiencing large or rapid temperature variations or maintaining hot or cold extremes for extended periods of time.

The 2220 comes in a traditional 1-inch square package with a 10' integrated cable and is operationally identical to the 2276, the small footprint device designed for tight spaces. The 2220 and 2276 feature a hermetically sealed, low noise SDI Model 1522 surface mount accelerometer, which is individually tested, programmed, calibrated and verified in a climate chamber to ensure the greatest accuracy in thermally volatile conditions. The 2220 and 2276 include initial calibration reports.

Onboard voltage regulation and an internal voltage reference eliminate the need for precision power supplies. The robust, anodized aluminum case is potted then epoxy sealed and can be mounted easily via two screws, an adhesive, or by attaching a magnet.

ZERO TO MEDIUM FREQUENCY APPLICATIONS

OPERATION

SDI Models 2220 and 2276 MEMS DC Accelerometers provide optimal performance when they are connected to instrumentation in a differential configuration using both the AOP and AON output signals, but they also support single ended operation for complete flexibility.

These Accelerometers produce differential analog output voltage pairs (AON & AOP) which vary with acceleration. The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. At zero acceleration, the output differential voltage is nominally 0 volts DC; at ±full scale acceleration, the output is ±4 volts DC, respectively, as shown in the figure (below). The output scale factor is independent from the supply voltage of +8 to +32 volts.

When a differential connection is not possible, SDI recommends connecting the accelerometer to instrumentation in single ended mode by connecting AOP and GND to the instrumentation and leaving AON disconnected. Keep in mind that the signal to noise ratio is reduced by half for a single-ended vs. a differential connection.

PERFORMANCE - ALL VERSIONS

All Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode. Span = ±g range = 8000 mV.

Note (1): For 2g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g.

NOTICE: Stresses greater than those listed may cause permanent damage to the device. These are maximum stress ratings only. Functional operation of the device at or above these conditions is not implied.

PACKAGE DIMENSIONS

3-AXIS VERSIONS

SDI’s high-performance, single axis accelerometers are also built in three-axis configurations for multi-dimensional sensing in one package with only a single excitation connection. The high-performance SDI Models 2470 and 2476 are the three axis versions of the 2220 and 2276 with similarly upgraded SDI Model 1522 surface mount accelerometers, improved bias and scale factor temperature shift performance, and include an initial calibration certificate. The 2470 includes a 3-foot integrated cable and is operationally identical to the 2476, which features a connector for easily customized cable lengths and positions.