PA97DR
PA97DRU 1
PA97DR
FEATURES
• HIGHVOLTAGE—900V(±450V)
• LOWQUIESCENTCURRENT—600µA
• HIGHOUTPUTCURRENT—10mA
APPLICATIONS
• MASSSPECTROMETERS
• SCANNINGCOILS
• HIGHVOLTAGEINSTRUMENTATION
• PROGRAMMABLEPOWERSUPPLIESUP
TO880V
• SEMICONDUCTORMEASUREMENTEQUIP-
MENT
Power Operational Amplifiers
PA97DR
Q1 Q2
R1 R2 C1
12
R4
Q3
CC1
CC2
Q6
Q5
R7
R8
2
1
R9
Q14
R16
10
R18
Q15
R5
8
6
4
Q4
OUT
Q12
R14
+V
S
–IN
+IN
–V
S
R10
Q10A Q10B
DESCRIPTION
The PA97DR is a high voltage MOSFET operational
amplier designed as a low cost solution for driving
continuousoutputcurrentsupto10mAandpulsecur-
rentsto15mAintocapacitiveloads.Thesafeoperating
area(SOA)hasnosecondbreakdownlimitations.The
MOSFET output stage is biased class C for low qui-
escentcurrentoperation.Externalcompensationpro-
videsexibilityinchoosingbandwidthandslewratefor
the application.Apex Microtechnology’s SIP05 pack-
ageusesaminimumofboardspaceallowingforhigh
densitycircuitboards.
EQUIVALENT SCHEMATIC
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com OCT 2012
PA97U REVI
PA97DR
2 PA97DRU
Parameter Symbol Min Max Units
SUPPLYVOLTAGE,+VSto-VS900 V
OUTPUTCURRENT,source,sink,withinSOA 15 mA
POWERDISSIPATION,continuous@TC=25ºC 5 W
INPUTVOLTAGE,differential(Note3) -20 20 V
INPUTVOLTAGE,commonmode(SeeText) -VSVSV
TEMPERATURE,pinsolder,10smax. 220 °C
TEMPERATURE,junction(Note2) 150 °C
TEMPERATURERANGE,storage −65 150 °C
OPERATINGTEMPERATURE,case −55 125 °C
CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter Test Conditions Min Typ Max Units
INPUT
OFFSETVOLTAGE,initial 0.5 5 mV
OFFSETVOLTAGEvs.temperature Fulltemperaturerange 10 50 µV/°C
OFFSETVOLTAGEvs.supply 10 25 µV/V
OFFSETVOLTAGEvs.time 75 µV/kHz
BIASCURRENT,initial 200 2000 pA
BIASCURRENTvs.supply 4 pA/V
OFFSETCURRENT,initial 50 500 pA
INPUTIMPEDANCE,DC 1011 Ω
INPUTCAPACITANCE 4 pF
COMMONMODEVOLTAGERANGE
(Note3) VS=±250V ±VSŦ30 V
COMMONMODEREJECTION,DC VCM=±90V 80 98 dB
NOISE 10KHzBW,RS=1KΩ,
CC=10pF 2 µVRMS
GAIN
OPENLOOP@15Hz RL=5KΩ,CC=10pF 94 111 dB
GAINBANDWIDTHPRODUCT@1MHz RL=5KΩ,CC=10pF 1 MHz
POWERBANDWIDTH RL=5KΩ,CC=10pF 2 kHz
PHASEMARGIN,AV=100 Fulltemperaturerange 60 °
OUTPUT
VOLTAGESWING(Note3) IO=10mA ±VSŦ24 ±VSŦ20 V
CURRENT,continuous 10 mA
SLEWRATE,AV=100 CC=10pF 8 V/µS
SETTLINGTIME,to0.1% CC=10pF,2Vstep 2 µS
RESISTANCE 10mALoad 100 Ω
SPECIFICATIONS
PA97DR
PA97DRU 3
NOTES: 1. Unlessotherwisenoted:TC=25°C,DCinputspecicationsare±valuegiven.Powersupplyvoltage
istypicalrating.
CC=10pF.
2. Longtermoperationatthemaximumjunctiontemperaturewillresultinreducedproductlife.Derate
internalpowerdissipationtoachievehighMTTF.
3. Althoughsupplyvoltagescanrangeupto±450Vtheinputpinscannotswingoverthisrange.The
inputpinsmustbeatleast30Vfromeithersupplyrailbutnotmorethan500Vfromeithersupplyrail.
Seetextforamorecompletedescriptionofthecommonmodevoltagerange.
4. Ratingappliesiftheoutputcurrentalternatesbetweenbothoutputtransistorsataratefasterthan
60Hz.
5. Deratemaxsupplyrating.625V/°Cbelow25°Ccase.Noderatingneededabove25°Ccase.
CAUTION The PA97DR is constructed from MOSFET transistors. ESD handling procedures must be ob-
served.
Parameter Test Conditions Min Typ Max Units
POWER SUPPLY
VOLTAGE(Note5) ±50 ±300 ±450 V
CURRENT,quiescent,amplieronly 0.6 1 mA
THERMAL
RESISTANCE, AC, junction to case(Note4) Fulltemprange,F>60Hz 20 ºC/W
RESISTANCE, DC, junction to case Fulltemprange,F<60Hz 25 ºC/W
RESISTANCE, junction to air Fulltemprange 40 ºC/W
TEMPERATURERANGE,case –25 +85 ºC
TEMPERATURE, T (°C)
1M.6M 2M 3M
FREQUENCY, F (Hz)
PHASE RESPONSE
PHASE, Ф (°)
10 100 10K 1M
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE, VN (nV/√Hz)
-120
-140
-160
-180
-200
-220
OUTPUT CURRENT, IO (mA)
INPUT NOISE
1K
2
7
10
20
3
5
15
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
SAFE OPERATING AREA
20
10
8
6
5
4
3
2
1
100 200 300 400 600 1000
CC =10pF
OUTPUT CURRENT FROM +VS OR –VS, (mA)
100µS
DC,T
C
=25°C
DC,TC=85°C
DC,TC=125° C
SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V)
1 10M
FREQUENCY, F (Hz)
0
60
120
140 SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
20
40
80
100
100 1K 10K .1M 1M10
CC = 10pF
1.08
1.04
1.00
0.96
0.92
0.88
100 200 300 400 500 600 700 800 900
NORMALIZED QUIESCENT CURRENT, I (X)
TOTAL SUPPLY VOLTAGE, VS (V)
QUIESCENT CURRENT
OUTPUT VOLTAGE SWING
14
13
12
11
10
9
0 2 4 6 8 10
POWER DERATING
INTERNAL POWER DISSIPATION, P(W)
5
4
3
2
1
00 25 50 75 100 125 150
SWING FROM +VS
SWING FROM -VS
10K 30K
FREQUENCY, F (Hz)
50
1K
500
POWER RESPONSE
OUTPUT VOLTAGE, VO (VP-P)
100
1K
C
C
= 10pF
200
T = TC
T = TA
PA97DR
4 PA97DRU
EXTERNAL CONNECTIONS
* 0.01µF or greater ceramic power supply bypassing
required.CC=10pFminimum,1kVNPO(COG).
PHASE COMPENSATION
GAIN CC
≥10 10pF
TEMPERATURE, T (°C)
1M.6M 2M 3M
FREQUENCY, F (Hz)
PHASE RESPONSE
PHASE, Ф (°)
10 100 10K 1M
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE, VN (nV/√Hz)
-120
-140
-160
-180
-200
-220
OUTPUT CURRENT, IO (mA)
INPUT NOISE
1K
2
7
10
20
3
5
15
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
SAFE OPERATING AREA
20
10
8
6
5
4
3
2
1
100 200 300 400 600 1000
CC =10pF
OUTPUT CURRENT FROM +VS OR –VS, (mA)
100µS
DC,T
C
=25°C
DC,TC=85°C
DC,TC=125° C
SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V)
1 10M
FREQUENCY, F (Hz)
0
60
120
140 SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
20
40
80
100
100 1K 10K .1M 1M10
CC = 10pF
1.08
1.04
1.00
0.96
0.92
0.88
100 200 300 400 500 600 700 800 900
NORMALIZED QUIESCENT CURRENT, I (X)
TOTAL SUPPLY VOLTAGE, VS (V)
QUIESCENT CURRENT
OUTPUT VOLTAGE SWING
14
13
12
11
10
9
0 2 4 6 8 10
POWER DERATING
INTERNAL POWER DISSIPATION, P(W)
5
4
3
2
1
00 25 50 75 100 125 150
SWING FROM +VS
SWING FROM -VS
10K 30K
FREQUENCY, F (Hz)
50
1K
500
POWER RESPONSE
OUTPUT VOLTAGE, VO (VP-P)
100
1K
C
C
= 10pF
200
T = TC
T = TA
TYPICAL APPLICATION
LOW POWER, PIEZOELECTRIC POSITIONING
Piezo positioning may be applied to the focusing of seg-
mentedmirrorsystems.Thecompositemirrormaybecom-
posedofhundredsofelements,eachrequiringfocusingun-
dercomputercontrol.InsuchcomplexsystemsthePA97DR
reducesthecostsofpowersuppliesandcoolingwithitsad-
vantagesoflowcostandlowquiescentpowerconsumption
whileincreasingcircuitdensitywiththeSIPpackage.
F
R
PA97DR
IN
R
PIEZO DRIVE
S
–V
S
+V
OUT
V
COMPUTER
FOCUS
COMMAND
VOLTAGE C
C
1
2
10
4
8
12
6
1 2 4 6 8 10 12
* *
–IN +IN CC1 CC2 OUT
–Vs +Vs
C
C
*
PATENTED
7-pin SIP
PACKAGE STYLE DR
GENERAL
Pleasereadthe“GeneralOperatingConsiderations”section,whichcoversstability,supplies,heatsinking,mount-
ing,currentlimit,SOAinterpretation,andspecicationinterpretation.Additionalinformationcanbefoundintheap-
plicationnotes.Forinformationonthepackageoutline,heatsinks,andmountinghardware,consultthe“Accessory
andPackageMechanicalData”sectionofthehandbook.
CURRENT LIMIT
ThePA97DRhasnoprovisionforcurrentlimitingtheoutput.
PA97DR
PA97DRU 5
COMMON MODE INPUT RANGE
Operationalampliersareusuallydesignedtohaveacommonmodeinputvoltagerangethatapproximatesthe
powersupplyvoltagerange.However,tokeepthecostaslowaspossibleandstillmeettherequirementsofmost
applicationsthecommonmodeinputvoltagerangeofthePA97DRisrestricted.Theinputpinsmustalwaysbea
least30Vfromeithersupplyvoltagebutnevermorethan500V.ThismeansthatthePA97cannotbeusedinap-
plicationswherethesupplyvoltagesareextremelyunbalanced.Forexample,supplyvoltagesof+800Vand–100V
wouldnotbeallowedinanapplicationwherethenon-invertingpinisgroundedbecauseinnormaloperationboth
inputpinswouldbeat0Vandthedifferencevoltagebetweenthepositivesupplyandtheinputpinswouldbe800V.
Inthiskindofapplication,however,
supplyvoltages+500Vand-100Vdoesmeettheinputcommonmodevoltage
rangerequirementssincethemaximumdifferencevoltagebetweentheinputspinsandthesupplyvoltageis500V
(themaximumallowed).Theoutputhasnosuchrestrictionsonitsvoltageswing.Theoutputcanswingwithin24V
ofeithersupplyvoltageregardlessofvaluesolongasthetotalsupplyvoltagedoesnotexceed900V.
INPUT PROTECTION
AlthoughthePA97DRcanwithstanddifferentialinputvoltagesupto±20V,additionalexternalprotectionisrecom-
mended.Inmostapplications1N4148or1N914signaldiodesaresufcient(D1,D2inFigure2a).Inmoredemand-
ingapplicationswherelowleakageorlowcapacitanceareofconcern2N4416or2N5457-2N5459JFETsconnected
asdiodeswillberequired(Q1,Q2inFigure2b).Ineithercasetheinputdifferentialvoltagewillbeclampedto±.7V.
Thisissufcientoverdrivetoproducemaximumpowerbandwidth.Notethatthisprotectiondoesnotautomatically
protecttheamplierfromexcessivecommonmodeinputvoltages.
POWER SUPPLY PROTECTION
Unidirectionalzenerdiodetransientsuppressorsarerecommendedaspro-
tectionon thesupplypins.Thezeners clamp transientstovoltages within
thepowersupplyratingandalsoclamppowersupplyreversalstoground.
Whether the zeners are used or not, the system power supply should be
evaluatedfortransientperformanceincludingpower-onovershootandpow-
er-offpolarityreversalaswellaslineregulation.
Conditionswhichcancauseopencircuitsorpolarityreversalsoneitherpow-
ersupplyrailshouldbeavoidedorprotectedagainst.Reversalsoropenson
thenegativesupplyrailisknowntoinduceinputstagefailure.Unidirectional
transzorbspreventthis,anditisdesirablethattheybebothelectricallyand
physicallyasclosetotheamplieraspossible.
EXTERNAL COMPONENTS
ThecompensationcapacitorCcmustberatedforthetotalsupplyvoltage.
10pFNPO(COG)capacitorratedat1kVisrecommended.
Ofequalimportanceisthevoltageratingandvoltagecoefcientofthegain
settingfeedbackresistor.Typicalvoltageratingsoflowwattageresistorsare
150to250V.Upto900Vcanappearacrossthefeedbackresistor.High
voltage rated resistors can be obtained. However a 1 megohm feedback
resistor composed of ve 200k resistors in series will produce the proper
voltagerating.
CAUTIONS
TheoperatingvoltagesofthePA97DRarepotentiallylethal.Duringcircuitdesigndevelopafunctioningcircuitat
thelowestpossiblevoltages.Cliptestleadsshouldbeusedfor"handsoff"measurementswhiletroubleshooting.
Withnointernalcurrentlimit,properchoiceofloadimpedanceandsupplyvoltageisrequiredtomeedSOAlimitia-
tions.Anoutputshortcircuitwilldestroytheamplierwithinmilliseconds.
STABILITY
ThePA97DRisstableatgainsof10ormorewithaNPO(COG)compensationcapacitorof10pF.Thecompensation
capacitor,Cc,intheexternalconnectionsdiagrammustberatedat1000Vworkingvoltageandmountedcloselyto
pins4and6topreventspuriousoscillation.Acompensationcapacitorlessthan10pFisnotrecommended.
PA97DR
+V
S
–IN
+IN
Z1
Z2
D2 D1
12
10
1
2
+V
S
–IN
+IN
Z1
Z2
12
10
1
2
PA97DR
Q1 Q2
A.
B.
–V
S
–V
S
FIGURE2.
PA97DR
6 PA97DRU
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PA97U REVI