SHA1144_15 AD | Alldatasheet
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:t10V min Input/Output Range 50ns Aperture Delay 0.5nsApertureJitter-A ",;.r/.h';'6p~Time ~ -r :to.001% Max Gain LinearityError Complete with Input Buffer APPLICA TlONS Track and Hold Peak Measurement Systems Data AcquisitionSystems Simultaneous Sample-and-Hold GENERAL DESCRIPTION The SHAl144 isa fastsample-hold amplifiermodule with ac curacy and dynamic performance appropriateforapplications with fast14-bitAID converters.In the "sample" mode, itacts asa fastamplifier,trackingthe input signal.When switched to the "hold" mode, the output isheld at a levelcorresponding to the input signalvoltageatthe instantof switching.The droop ratein "hold" isappropriateto allow accurateconver- sionby 14-bitAID convertershaving conversiontimes of up to 150ps. DYNAMIC PERFORMANCE The SHA1144 was designedto be compatible with fast14-bit AID converterssuch asthe Analog Devices'ADCl130 and ADC1131 series,which convert 14 bitsin 25/1sand 12/1s,re- spectively.Maximum acquisitiontime of 8ps forthe SHA1144 permits high sampling ratesfor 14-bitconversions.The SHAl144 isguaranteed to have a maximum gain nonlinearity of :to.OOl% of fullscaleto insure1/2LSB accuracy in 14-bit systems.When in the "hold" mode, the droop rateis1pV/ps, so the SHA1144 willhold an input signalto :to.OO3% of full scale(20V pop)forover 600ps. PRINCIPLE OF OPERATION The SHAl144 consistsbasicallyof two high speed operational amplifiers,a storagecapacitor,and a digitallycontrolled switch.Itdiffersfrom typicalsample-and-holdmodules inone important respect;applicationversatility.The user completes the SHAl144 feedback circuitexternalto the module. There- fore,the module may be used ininvertingor noninvertingcon- figurationsand can easilybe arrangedto provide circuitgain of more than unity to simplifysignalconditioningin a subsystem. Information furnished by Analog Devices isbelievedto be accurate and reliable.However. no responsibilityisassumed by Analog Devices for itsuse;nor for any infringementsof patentsor other rightsof third partieswhich may resultfrom itsuse.No licenseisgrantedby implica- tionor otherwiseunder any patent or patent rightsof Analog Devices. \\J<YJ'. FEEDBACK CONNECTIONS A block diagram of the SHA1144 isshown in Figure 1.The in- put sectionactsas a voltage-to-currentconverter,providingthe currentneeded to charge the "hold" capacitor.The output amplifierisolatesthe "hold" capacitorand provideslow out- put impedance fordrivingthe load.Since feedback isnot hard- wired inthe module, both invertingand noninvertinginput terminalsareavailable,and the SHA1144 can be connected as a followerwith unity gain or potentiometricgain,as wellas inverteror even a differentialamplifier.Sincethe unity gain followermode willbe the most frequentapplication,perform- ance data listedinthe specificationtableisbased on thisoper- atingmode. -15V ANALOG GROUND +15V HOLDCAPACITOR +INPUT+VOLTAGETOCURRENT CONVERTER 1.5mA/V OUTPUT -INPUT MODE CONTROL DIGITAL GROUND Figure1. Block Diagram - SHA 1144 Telex:924491 Cables:ANALOG NORWOODMASS OBSOLETE
SPECIFICATIONS @+25°C, gain= +1VIV andnominal unlessotherwisenoted) MODEL ACCURACY Gain Gain Error Gain Nonlinearity Gain Temperature Coefficient(0 to +70°C) INPUT CHARACTERISTICS Input Voltage Range Impedance BiasCurrent InitialOffsetVoltage Offsetvs.Temperature (0 to +70°C) OUTPUT CHARACTERISTICS Voltage Current Resistance Capacitiveload Noise @ 100kHz Bandwidth 1MHz Bandwidth SAMPLE MODE DYNAMICS Frequency Response Small Signal(-3dB) FullPower Slew Rate --._---- SHA1144 +lV/V :to.005% :to.0005% (:to.001% max) :t1ppm/C (:t2ppm/C max) :t10V lOll n 1l1OpF 0.5nA max Adjustableto Zero :t30IlV/C max :t10V min :t20mA min <In 350pF 70llVpop 1MHz 50kHz SAMPLE-TO-HOLD SWITCHING ApertUre Delay Time Aperture Uncertainty OffsetStep OffsetNonlinearity Switching Transient Time to :to.003% HOLD MODE Droop Rate Variationwith Temperature . (for20V HOLD-TO-SAMPLE SWITCHING AcquisitionTime to :to.003% :to.01% DIGITAL INPUT Sample Mode (Logic "I") Hold Mode (Logic "0") @ 1kHz) (20V Step) (10V Step) (20V Step) POWER 50ns 0.5ns 1mV 160llV 50mV IllS 11lV/IlS(21lV/Ilsmax) double every + 10° C -80dB 61ls(81lsmax) 51ls 51ls 41ls +2V<Logic "I" <+5.5V @ 15nAmax OV<Logic "0" <+0.8V +15V :t3% @ 60mA -15V :t3% @ 45mA TEMPERATURE RANGE Operating 0 to +700C -55°C to +85°C 1Recommended Power Supply AD! Model 902-2,:t15V @ :t100mA output. Specifications subject to change without notice. -2- OUTLINE DIMENSIONS Dimensionsshown ininchesand (mm). L SHA1144 BOTTOM VIEW PIN DESIGNATIONS 0.42MAX (10.7)
2.015 MAX
(51.18) J 7. ANALOG GROUND 8. -15V 9. ANALOG OUTPUT 10. MODE CONTROL 11. DIGITAL GROUND 1. TRIM 2. TRIM 3. +INPUT 4. -INPUT 5. TRIM 6. +15V OFFSET ZERO ADJUST (OPTIONAL) r--t01 I OFFSET " ZERO r : ADJUST: " I L.--I02 I 10kD. I L -105 OBSOLETE
set-up.To assistwith such evaluations,an AC1580 isavailable. (P2) which are suppliedwith every card. drawing and schematic areprovided forreference. en in accordance with the option chart. units,+4.9991V for:t5V unitsor +9.9982V for :t10V units.
20 GND SENSE
11 DIGITAL
15 GND
5 ANALOG GND
0 INCH 4
9 INCH 13
10 IN CH 14
11 IN CH 16
12 INCH 16
Figure 11. Schematic and Pin Designations
Dimensionsshown ininchesand (mm).
- P21S CINCH CONNECTOR TYPE 251.1)6.30.160
Figure 12. AC1580Mounting Board Table 1. Option Chart