976A Data Sheet 04 17 2014 Rev 3 ejp - Maxwell …

1 1 MemoryAll data sheets are subject to change without notice(858) 503-3300- Fax: (858) 503-3301 - 2014 Maxwell TechnologiesAll rights Analog to Digital Rev 3 FEATURES: RAD-PAK radiation-hardened against natural space radiation Total dose hardness: > 100 krad (Si), depending upon space mission SEE Performance:SEL and SEFI immune at LET = 85 MeV cm2 and 125 C Package: 28 pin RAD-PAK flat package 200 kHz max sampling rate data Coding - Binary Twos Compliment 10 V input range Single +5 V supply operation Utilizeses an internal or external reference Power dissipation: 100 mW maxDESCRIPTION: Maxwell Technologies 976a high-speed 16-bit analog to digi-tal converter, features a greater than 100 krad (Si) total dosetolerance depending upon space mission, using Maxwell sradiation-hardened RAD-PAK packaging technology.

2 It is a 28pin, 16-bit sampling analog to digital converter using state-of-the-art BiCMOS structures. The 976a contains a 16-bit capac-itor based SAR A/D with S/H, reference, clock and interfacefor microprocessor use. The 976a is specified at a 200 kHzsampling rate, and guaranteed over the full temperaturerange. Maxwell Technologies' patented RAD-PAK packaging technol-ogy incorporates radiation shielding in the microcircuit pack-age. It eliminates the need for box shielding while providingthe required radiation shielding for a lifetime in orbit or spacemission. In a GEO orbit, RAD-PAK provides greater than 100krad (Si) radiation dose tolerance.

3 This product is availablewith screening up to Maxwell Technologies self-defined Block Diagram12k3k4k4kMemory2 All data sheets are subject to change without notice 2014 Maxwell TechnologiesAll rights Analog to Digital Rev 3-TABLE 1. 976a PIN DESCRIPTIONPINSYMBOLDESCRIPTION1 VINA nalog Input. Connect a 200 ohm resistor between VIN and the analog signal source. Full scale input range is + Ground. Used as ground reference point for REF Input/Output. The internal + reference is available at this pin. Alternatively, an external reference can be used to override the internal reference. In either case, connect a tantalum capacitor between REF and buffer Output.

4 Connect a tantalum capacitor between CAP and (MSB) data Bit 15. Most significant bit of conversion result. High impedence state when CS is high or when R/C is bits 14 impedence state when CS high or when R/C is Bits D7-D1. High impedence state when CS is high or when R/C is (LSB) data Bit 0. High impedence state when CS is high or when R/C is Select. With Byte LOW, data will be output as indicated above; Pin 6 (D15) is the MSB, Pin 22 (D0) is the LSB. Wtih BYTE HIGH, the top and bottom 8 bits of data will be switched; D15-D8 are output on Pins 15-22 and D7-D0 are output on Pins Input. With CS LOW, a falling edge on R/C puts the internal sample/hold into the hold state and starts a conversion; a rising edge enables the output data Selet Input.

5 Internally OR d with R/C. With R/C LOW, a falling edge on CS will initiate a conversion. With R/C HIGH, a falling edge on CS will enable the output data bits. When CS is HIGH, the output data bits will be in the Hi-impedence output. Goes LOW when a conversion is started and remains LOW until the conversion is completed and the data is latched into the output register. With CS tied LOW and R/C HIGH, output data will be valid when BUSY rises. The rising edge of BUSY can be used to latch the output Power Supply. Nominally + Power Supply. Nominally + 2. 976a ABSOLUTE MAXIMUM RATINGSPARAMETERMAXUNITA nalog Inputs- VIN- CAP- REF+25+VANA + TO AGND2 - Short to GroundVMemory3 All data sheets are subject to change without notice 2014 Maxwell TechnologiesAll rights Analog to Digital Rev 3 Ground Voltage Differences: - DGND- AGND1- AGND2+ + + to VANA+ 7 VDigital to VDIG + Temperature+150 COperating Temperature-55 to +125 Resistance (Tjc) C/WStorage Temperature-65 to +150 CTABLE 3.

6 976a DC ACCURACY SPECIFICATIONS1(SPECIFIED PERFORMANCE -55TO +125 C, VDIG=VANA = 5V +/- 5%)1. Unless otherwise specified, VREF = , VIH = , VIL = VPARAMETERSUBGROUPSMINTYPMAXUNITI ntegral Linearity Error1,2, 3-3--+3 LSB 22. LSB stands for Least Significant Bit. One LSB is equal to 305 Linearity Error1,2, 3-1--4 LSBNo Missing Codes 33. Not , 2, 315----BitsTransition Noise 44. Typical rms noise at worst case transitions and Scale Error 5,65. Measured with various fixed For bipolar input ranges, full scale error is the worst case of -Full Scale or +Full Scale untrimmed deviation from ideal first and last scale code transitions, divided by the transition voltage (not divided by the full-scale range) and includes the effect of off-set error.

7 For unipolar input ranges, full scale error is the deviation of the last code transition divided by the transition voltage. It also includes the effect of offset , 2, + Scale Error 5,6 (using ext. Vref)1, 2, + Scale Error Drift-- 7--ppm/ CFull Scale Error Drift (using ext. Vref)---- 7--ppm/ CBipolar Zero Error 51, 2, 3-10--+10mVBipolar Zero Error Drift-- 2--ppm/ CPower Supply Sensitivity 1,2, 3-12--+8 LSBTABLE 2. 976a ABSOLUTE MAXIMUM RATINGSPARAMETERMAXUNITM emory4 All data sheets are subject to change without notice 2014 Maxwell TechnologiesAll rights Analog to Digital Rev 3 TABLE 4. DELTA LIMITS1 PARAMETERVARIATIONICC+10% per Table 10 TABLE 5.

8 DIGITAL INPUTSPARAMETERSUB-GROUPSMINMAXUNITSI nput Voltage VIL11. Tested by application of signal, VIL at , VIH at , 2, + Voltage VIH11, 2, 3+ + Current IIL1, 2, 3-1010uAInput Current IIH1, 2, 3-1010uADIGITAL OUTPUTSSPECIFIED PERFORMANCE -55TO +125 C, VDIG=VANA = 5V +/- 5%)PARAMETERSUB-GROUPSMINMAXUNITSData Formatting - 16 BitsData Coding - Binay Twos ComplimentVOL @ , 2, 1, 2, 3-55uAVOH @ 500uA1, 2, 34 VIOH1, 2, 3-55uATABLE 6. 976a ANALOG INPUT AND THROUGHPUT SPEEDSPECIFIED PERFORMANCE -55TO +125 C, VDIG=VANA = 5V +/- 5%)PARAMETERSUBGROUPSMINTYPMAXUNITV oltage Ranges---1010 VImpedance11, 2, 3--13--kohmsCapacitance11.

9 Not Capcitance11, 2, 3----15pFComplete Cycle (Acquire and Convert)9, 10, 11----5 sThroughput Rate 22. Tested by application of signal at , 10, 11200----kHz1) Parameters are measured and recorded as Delts per MIL-STD-883 for Class S data sheets are subject to change without notice 2014 Maxwell TechnologiesAll rights Analog to Digital Rev 3 TABLE 7. 976a AC ACCURACY SPECIFICATIONSSPECIFIED PERFORMANCE -55TO +125 C, VDIG=VANA = 5V +/- 5%)PARAMETERSUBGROUPSMINTYPMAXUNITS purious-Free Dynamic Range, fIN = 20 kHz 11. Not Tested4, 5, 690----dB 22. All specifications in dB are referred to a full-scale 10 V Harmonic Distortion, fIN = 20 kHz 14, 5, 6-----90dBSignal-to-Noise (Noise + Distortion) 1fIN = 20 kHz-60 dB Input4, 5, 683----27----dBSignal-to-Noise 1, fIN = 20 kHz4, 5, 683----dBFull-Power Bandwidth 1,33.

10 Full-Power Bandwidth defined as Full-Scale input frequency at which Signal-to-Noise (Noise + Distortion) degrades to 60 8. 976a SAMPLING DYNAMICSSPECIFIED PERFORMANCE -55TO +125 C, VDIG=VANA = 5V +/- 5%)PARAMETERSUBGROUPSMINTYPMAXUNITI nput Delay--40--nsAperture Jitter9, 10, 11 Sufficient to meet AC specificationTransient Response FS Step29, 10, 11----1usOvervoltage Recovery 11. Recovers to specified performance after 2 X FS input Not Tested--150--nsTABLE 9. 976a REFERENCESPECIFIED PERFORMANCE -55TO +125 C, VDIG=VANA = 5V +/- 5%)PARAMETERCONDITIONSMINTYPMAXUNITI nternal Reference VoltageNo Reference Source Current (Must be ext.