CAPACITIVE SENSOR
ANALOG OUTPUT
WIDE TEMPERATURE RANGE
SURFACE MOUNT PACKAGE

FEATURES

• ± 4V Differential Output or
      .05 to 4.5V Single Ended Output

• Low Power Consumption

• -55 to +125 °C Operation

• Built-in Nitrogen Damping

• Calibrated to 1% Bias & Scale Factor (Typ)

• +5 V DC Power

• Responds to DC and AC Acceleration

• Non Standard G Ranges Available
• Hermetic LCC or J-Lead Surface Mount Package
• Serial Number for Traceability

DESCRIPTION The Model 1210 accelerometer is a low-cost, integrated accelerometer for use in zero to medium frequency instrumentation applications. It combines in a single, miniature, hermetically sealed package, a micromachined capacitive sense element and a custom integrated circuit that includes a sense amplifier and differential output stages. It is relatively insensitive to temperature changes and gradients and each device is marked with a serial number in its bottom Surface for traceabilty.

ORDERING INFORMATION Full Scale Acceleration Hermetic Packages 20 pin LCC 20 pin JLCC ±5 G 1210L-005 1210J-005 ±10 G 1210L-010 1210J-010 ±25 G 1210L-025 1210J-025 ±50 G 1210L-050 1210J-050 ±100 G 1210L-100 1210J-100 ±200 G 1210L-200 1210J-200

OPERATION The Model 1210 accelerometer produces two analog voltage outputs which vary with acceleration as shown in the figure below. The outputs can be used either in differential or single ended modes referenced to +2.5 volts. Two reference voltages -- +5.0 and +2.5 volts (nominal) -- are required; the output scale factor is ratiometric to the +5 volt reference voltage, and both outputs at zero acceleration are equal to the +2.5 volt reference. The sensitive axis is perpendicular to the bottom of the package, with positive acceleration defined as a force pushing on the bottom of the package.

SIGNAL DESCRIPTIONS

VDD and GND (Power): Pins (8,9,11,14) and (2,5,6,18,19) respectively. Power (+5 Volts DC) and ground.

AOP and AON (Output): Pins 12 and 16 respectively. Analog output voltages proportional to acceleration. The AOP voltage increases with positive acceleration, the AON voltage decreases with positive acceleration; at zero acceleration both outputs are nominally equal to the 2.5 volt reference. The device experiences positive (+1g) acceleration with its lid facing up in the earth's gravitational field. Either output can be used individually or the two outputs can be used differentially. Voltages can be measured ratiometrically to VR for good accuracy without requiring a precision reference voltage. (See plot.)

DV (Input): Pin 4. Deflection Voltage. A test input that applies an electrostatic force to the sense element, simulating a positive acceleration. The nominal voltage at this pin is 1/2 VDD.

VR (Input): Pin 3. Voltage Reference. Tie directly to +5 volt power for ratiometric measurements or a +5 volt reference voltage for better absolute accuracy.  A 0.1uF bypass capacitor is recommended at this pin.

2.5 Volt (Input): Pin 17. Voltage Reference. Tie to a voltage divider from +5 volts or to a 2.5 volt reference voltage.

     Note 1: Single ended sensitivity is half of values shown

Notes:    2: Tighter tolerances available on special order.
               3: These maximums do not apply to 5g version; contact factory for current 5g specifications.
               4: 100g versions and above are tested from -65 to +65g.