"L" SUFFIX PACKAGE "J" SUFFIX PACKAGE 0.350

Transcription

1 MODEL 1521 NLO SUCE MOUN CCELEOMEE Low Noise: 7 μg/ Hz typical for 2g ull Scale Version High Stability -55 to +125 C Operation ±V Differential Output +5 VDC, 5 m Power (ypical) esponds to DC and C Integrated Sensor & mplifier Internal emperature Sensor Nitrogen Damped & Hermetically Sealed Serialized for raceability Pin Compatible with Models 1210 and 1221 ohs Compliant VILBLE -NES ULL SCLE CCELEION 20 PIN JLCC 20 PIN LCC ± 2 g ± 5 g ± 10 g ± 25 g ± 50 g ± 100 g ± 200 g ± 00 g 1521J L J L J L J L J L J L J L J L-00 "L" SUIX PCKE "J" SUIX PCKE DESCIPION he Model 1521 is a low-cost, general-purpose integrated MEMS accelerometer for use in zero to medium frequency instrumentation applications that require extremely low noise and reliable long-term stability. Each miniature, hermetically sealed package combines a micro-machined capacitive sense element and a custom integrated circuit that includes a sense amplifier and differential output stage. It is very insensitive to temperature changes and gradients. Each device is marked with a serial number on its top and bottom surfaces for traceability. n optional calibration test sheet (1521-S) is also available which lists the measured bias, scale factor, linearity, operating current and frequency response. ZEO (DC) O MEDIUM EQUENCY PPLICIONS PEOMNCE INPU EQUENCY ESPONSE SENSIIVIY, OUPU NOISE, DIEENIL MX. MECHNICL NE (MINIMUM, 3 DB) DIEENIL (MS, YPICL) SHOCK (0.1 MS) g Hz mv/g μg/(root Hz) g (peak) ± ± ± ± ± ± ± ± By Model: V DD =V =5.0 VDC, C =25 C. [page 1] 29-pril-20

2 PEOMNCE - LL VESIONS ll Models: Unless otherwise specified V DD =V =5.0 VDC, C =25 C, Differential. Span = ±g range = 8000 mv PMEE MIN YP MX UNIS Bias Calibration Error ± % of span Bias emperature Shift ( C = -55 to +125 C) (PPM of span)/ C Scale actor Calibration Error 1, ± % Scale actor emperature Shift ( C = -55 to +125 C) PPM/ C Non-Linearity (-90 to +90% of Span) 1, ± % of span Long erm Bias Stability ± PPM of span Long erm Scale actor Stability ± PPM Cross xis Sensitivity 2 3 ± % Input xis Misalignment 5 10 ± mrad urn-on ransient (in less than 0.5ms) 75 ± PPM of S Output Impedance 90 Ohms Operating Voltage volts Operating Current (IDD+IV) 5 6 m Mass: L package (add 0.06 grams for J package) 0.62 grams MXIMUM INS * Case Operating emperature 2-55 to +125 C Storage emperature 2-55 to +125 C Voltage on V DD to ND -0.5V to 6.5V Voltage on ny Pin (except ) to ND -0.5V to V DD +0.5V Voltage on to ND (Self-est) ±15V Power Dissipation 50 mw Note 1: ighter tolerances may be available on special order. Note 2: Minimize exposure above 125 C for maximum lifespan. Note 3: or 2g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g. Note : Voltages on pins other than, ND or V DD may exceed 0.5 volt above or below the supply voltages provided the current is limited to 1 m. * NOICE: Stresses greater than those listed above may cause permanent damage to the device. hese are maximum stress ratings only. unctional operation of the device at or above these conditions is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability and lifespan. OPEION he model 1521 sensitive axis is perpendicular to the bottom of the package, with positive acceleration resulting from a positive force pushing on the bottom of the package. he seismic center is located on a centerline through the dual sense elements and halfway between them. he internal electronics effectively cancel any errors due to rotation. wo reference voltages, +5.0 and +2.5 volts (nominal), are required; scale factor is ratiometric to the +5.0 volt reference voltage relative to ND, and both outputs at zero acceleration are nominally 80 mv below the +2.5 volt input. he Model 1521 produces a differential +/- volts output voltage or single ended mode, volts full scale, the value of which varies with acceleration as shown in the figures below. [page 2] 29-pril-20

3 SINL DESCIPIONS V DD and ND (power): Pins (1) and (19) respectively. Power (+5 Volts DC) and ground. and (output): Pins 12 and respectively. nalog output voltages proportional to acceleration. he voltage increases ( decreases) with positive acceleration; at zero acceleration both outputs are nominally equal to the +2.5 volt reference. he device experiences positive (+1g) acceleration with its lid facing up in the earth s gravitational field. Use of differential mode is strongly recommended for both lowest noise and highest accuracy operation. Voltages can be measured ratio-metrically to V for good repeatability without requiring a separate precision reference voltage for an /D. (input): Pin. Deflection Voltage. test input that applies an electrostatic force to the sense element, simulating a positive acceleration. he nominal voltage at this pin is ½ V DD. voltages higher than required to bring the output to positive full scale may cause device damage. I V (vdd) 20 OP VIEW ND V (input): Pin 3. Voltage eference. ie to a good reference (not directly to VDD) for best scale factor repeatability. 0.1μ bypass capacitor is recommended at this pin. V current is less than 100 u. 2.5 Volt (input): Pin. Sets internal and output common mode value. ie to a resistive voltage divider from +5 volts. 0.1μ bypass capacitor is recommended at this pin. I (output): Pin 8. emperature dependent current source. May be tied to V DD if not used. (vdd) VDD Special Use Pins: Pins 9 and 11 should be tied to VDD, Pins 2, 5, 6, and 18 to ND. ** Pins 1, 7, 10, 13, 15, and 20 are reserved for future use and should remain unused ** ECOMMENDED CONNECIONS DELECION VOLE () ES INPU: his test input applies an electrostatic force to the sense element, simulating a positive acceleration. It has a nominal input impedance of 32 kω and a nominal open circuit voltage of ½ V DD. or best accuracy during normal operation, this input should be left unconnected or connected to a voltage source equal to ½ of the V DD supply. he change in differential output voltage ( - ) is proportional to the square of the difference between the voltage applied to the input (V ) and ½ V DD. Only positive shifts in the output voltage may be generated by applying voltage to the input. When voltage is applied to the input, it should be applied gradually. he application of voltages greater than required to bring the output to positive full scale may cause device damage. he proportionality constant (k) varies for each device and is not characterized. 2 1 ( ) k V VDD 2 he input (pin ) may be driven from a resistive divider. [page 3] 29-pril-20

4 igure 1 ES INPU (OPIONL) 0.01u + 5V VDD V I ND u OUPU (POSIIVE) OUPU (NEIVE) EMPEUE DEPENDEN CUEN SOUCE ESD and LCH-UP CONSIDEIONS: he model 1521 accelerometer is a CMOS device subject to damage from large electrostatic discharges. Diode protection is provided on the inputs and outputs, and it is not easily damaged, but care should be exercised during handling. However, individuals and tools should be grounded before coming in contact with the device. lthough the 1521 is resistant to latch-up, inserting a 1521 into or removing it from a powered socket may cause damage. INENL EMPEUE SENSIN he model 1521 accelerometer contains a temperature + 5V dependent current source that is output on pin 8. his signal is useful for measuring the internal temperature of u VDD V + 5 to + 15V the accelerometer so that any previously characterized bias and scale factor temperature dependence, for a I 8 particular accelerometer, can be corrected. he nominal 1521x-xxx 12 output current at 25 C is 500 (±200) μ and the nominal sensitivity is 1.5 (±0.5) μ/ C. luctuations in V DD & V ND -5 to -15V.01u have little effect on the temperature reading. V reduction of 0.10 V to both V DD & V will reduce the current about 1 μ, which corresponds to less than a 1 C IUE 2 change in reading. With a single resistor = 2K between I (pin 8) and ND the output voltage V will vary between and +1.3 volts from -55 to +125 C, which equates to a sensitivity of +3 mv/ C. V [( 500 ) + [( 1.5 )( 25) ] V = ( 1.5 ) If a greater voltage change versus temperature or lower signal source impedance is needed, add the amplifier as shown on the right side in igure 2. With offset voltage V = -5V, gain resistor = 15.0K and offset resistor = 7.32K, the output voltage V will vary between +.5 and +0.5 Volts from -55 to +125 C, which equates to a sensitivity of -29 mv/ C. V V V + 25 = V + ( 500 ) + [( 1.5 )( )] V ( 500 ) + [( 1.5 )( 25) ] V = ( 1.5 ) = V ( 1.5 )( ) igure 3 shows the voltage compliance of the temperature dependent current source (I ) at room temperature. he voltage at pin 8 must be kept in the 0 to +3V range in order to achieve proper temperature readings. [page ] 29-pril-20

5 PCKE DIMENSIONS 1. *Dimensions M,, and U locate sensing element s center of mass. 2. Lid is electrically tied to terminal 19 (ND). 3. Controlling dimension: Inch.. erminals are plated with 60 microinches min gold over 80 microinches min nickel. his plating specification does not apply to the Pin-1 identifier mark on the bottom of the J-lead package version. 5. Package: 90% min alumina (black), lid: solder sealed kovar. *U * "L" SUIX PCKE (20 PIN LEDLESS CEMIC CHIP CIE) C *M D L "J" SUIX PCKE (20 PIN LEDED CHIP CIE) E EMINL 20 EMINL 1 J K H Inches Millimeters Dim Min Max Min Max B C YP 1.0 YP D E YP 2. YP BSC 1.27 BSC YP 0.6 YP H YP 1.27 YP J 0.00 x x 5 K YP 0.25 YP L 0.0 YP 0.1 YP * M 0.08 YP 1.23 YP N P 0.0 YP 0.3 YP YP 0.58 YP * YP 2. YP * U 0.5 YP.5 YP P B SOLDEIN ECOMMENDIONS N ohs Compliance: he model 1521 does not contain elemental lead and is ohs compliant. Pre-inning of ccelerometer Leads is ecommended: o prevent gold migration embrittlement of the solder joints, it is best to pre-tin the accelerometer leads. LCC Solder Contact Plating Information: he plating composition and thickness for the solder pads and castellations on the L suffix (LCC) package are 60 to 225 micro-inches thick of gold (u) over 80 to 350 micro-inches thick of nickel (Ni) over a minimum of 5 micro-inches thick of molymanganese or tungsten refractory material. he J-Lead package top layer is 100 to 225 microinches thick of 99.7% gold (u) over 80 to 350 microinches thick of electroplated nickel (Ni). ecommended Solder Pad Pattern: he recommended solder pad size and shape for both the LCC and J LCC packages is shown in the diagram and table below. hese dimensions are recommendations only and may or may not be optimum for your particular soldering process. E D DIM Inch mm B C D E C Do not use ultrasonic cleaners. Ultrasonic cleaning may break internal wire bonds and will void the warranty. B [page 5] 29-pril-20