8001401ZX (Elantec Semiconductor)
Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
Features
 Slew rate 1500 V ms
 Output drive 100 mA
 Rise and fall times 2 9 ns
 Input resistance 1011X
 Power bandwidth 100 MHz
 MIL-STD-883 devices 100%
manufactured in U S A
Advantages
 Excellent phase linearity
 Driver cables and other
capacitive loads
 Wide supply range single or split
Ordering Information
Part No
Temp Range Package Outline
ELH0033G 883B b55 C to a125 C TO-8 MDP0002
8001401ZX is the SMD version of this device
Connection Diagram
12-Pin TO-8
General Description
The ELH0033 is a high-speed FET input voltage follower buff-
er designed to provide high output currents from DC to over
100 MHz The ELH0033 slews at 1500 V ms and will drive 100X
loads Phase linearity is excellent to 20 MHz allowing the buff-
er to be included in op amp loops
The ELH0033 is intended to fulfill a wide range of buffer appli-
cations such as high-speed line drivers video impedance trans-
formation nuclear instrumentation amplifiers op amp isolation
buffers for driving reactive loads and high impedance input
buffers for high-speed A to D’s and comparators
These devices are constructed using specially selected junction
FETs and active laser trimming to achieve guaranteed perform-
ance specifications The ELH0033 is specified for operation
from b55 C to a125 C
Elantec facilities comply with MIL-I-45208A and other applica-
ble quality specifications Elantec’s Military devices are 100%
fabricated and assembled in our rigidly controlled ultra-clean
facilities in Milpitas California For additional information on
Elantec’s Quality and Reliability Assurance policy and proce-
dures request brochure QRA-1
Equivalent Schematic
Top View
Note Case is electrically isolated
0033 – 1
0033 – 2
Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ‘‘controlled document’’ Current revisions if any to these
specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation Patent pending
1989 Elantec Inc


8001401ZX (Elantec Semiconductor)
Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
Absolute Maximum Ratings
VS Supply Voltage (Va b Vb)
40V TA Operating Temperature Range
VIN Input Voltage
40V ELH0033
b55 C to a125 C
PD Power Dissipation (See Curves)
1 5W
TJ Operating Junction Temperature
175 C
IOC Continuous Output Current
g100 mA
TST Storage Temperature
b65 C to a150 C
IOP Peak Output Current
g250 mA
Lead Temperature
(Soldering 10 seconds)
300 C
Important Note
All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually
performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test
equipment specifically the LTX77 Series system Unless otherwise noted all tests are pulsed tests therefore TJeTCeTA
Test Level
I
II
III
IV
V
Test Procedure
100% production tested and QA sample tested per QA test plan QCX0002
100% production tested at TA e 25 C and QA sample tested at TA e 25 C
TMAX and TMIN per QA test plan QCX0002
QA sample tested per QA test plan QCX0002
Parameter is guaranteed (but not tested) by Design and Characterization Data
Parameter is typical value at TA e 25 C for information purposes only
DC Electrical Characteristics VS e g15V VIN e 0V TMIN s TA s TMAX
Parameter
Description
Test Conditions
Min
ELH0033
Typ
Max
Test
Level
Units
VOS
DVOS DT
Output Offset
Voltage
Average Temperature
Coefficient of
Offset Voltage
RS s 100 kX
TJ e 25 C (Note 1)
RS s 100 kX
RS e 100X
5 10
15
50
I mV
I mV
V mV C
IB
Input Bias Current
TJ e 25 C (Note 1)
250 I
pA
TA e 25 C (Note 2)
2 5 IV
nA
TJ e TA e TMAX
10 I
nA
AV
Voltage Gain
RS e 100X RL e 1 kX
VIN e g10V
0 97 0 98 1 00
I
VV
RIN
Input Impedance
RL e 1 kX
1010
1011
IV X
TJ e 25 C (Note 1)
RL e 1 kX
1010
1011
IX
RO
Output Impedance
RL e 1 kX VIN e g1V
6 10
I
X
VO
Output Voltage
VIN e g14V
Swing
RL e 1 kX
g12
IV
VIN e g10 5V
RL e 100X TA e 25 C
g9
IV
IS Supply Current
14 5 20
22
I
mA
Power Consumption
600 660
I
mW
Note 1 Specification is at 25 C junction temperature due to requirements of high-speed automatic testing Actual values at operating
temperature will exceed the value at TJ e 25 C When supply voltages are g15V no-load operating junction temperature
may rise 40 C – 60 C above ambient and more under load conditions Accordingly VOS may change one to several mV and IB
will change significantly during warm-up Refer to IB vs temperature graph for expected values
Note 2 Measured in still air 7 minutes after application of power
2


8001401ZX (Elantec Semiconductor)
Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
AC Electrical Characteristics TC e 25 C VS e g15V RS e 50X RL e 1 kX
Parameter
Description
Test Conditions
Min
ELH0033
Typ
Max
SR Slew Rate
VIN e g10V
1000
1500
BW Bandwidth
VIN e 1 Vrms
100
Phase
Non-Linearity
BW e 1 MHz to 20 MHz
2
tr Rise Time
DVIN e 0 5V
tp
Propagation Delay
DVIN e 0 5V
29
12
HD
Harmonic Distortion
f l 1 kHz
k0 1
AV
Voltage Gain
RS e 100X
VIN e 1 Vrms
f e 1 kHz
0 97 0 98 1 00
RO
Output Impedance
VIN e 1 Vrms
f e 1 kHz
6 10
Test
Level
III
V
V
V
V
V
I
I
Units
V ms
MHz
ns
ns
%
VV
X
Typical Performance Curves
Maximum Power
Dissipation
Supply Current vs
Supply Voltage
Output Voltage vs
Supply Voltage
Negative Pulse
Response
Positive Pulse
Response
Frequency Response
0033 – 3
3


8001401ZX (Elantec Semiconductor)
Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
Typical Performance Curves Contd
Rise and Fall Time
vs Temperature
Input Bias Current
vs Temperature
Normalized Input Bias
Current During Warm-up
Input Bias Current
vs Input Voltage
Typical Applications
Offset Zero Adjust
Using Resistor
Current Limiting
0033 – 4
Current Limiting
Using Current Sources
0033 – 5
0033 – 6
0033 – 7
4


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Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
Typical Applications Contd
High Input Impedance AC Coupled Amplifier
Coaxial Cable Driver
fH t 100 MHz
0033 – 9
Select C1 for optimum pulse response
0033 – 8
Instrumentation Shield Line Driver
Single Supply AC Amplifier
0033 – 10
4 5 MHz Notch Filter
0033 – 11
High-Speed Sample and Hold
1
FO e 2qR1C1
R1 e 2 R2
C2
C1 e
2
0033 – 12
Polycarbon or teflon
5
0033 – 13


8001401ZX (Elantec Semiconductor)
Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
Applications Information
Recommended Layout Precautions
RF video printed circuit board layout rules
should be followed when using the ELH0033
since it will provide power gain to frequencies
over 100 MHz Ground planes are recommended
and power supplies should be decoupled at each
device with low inductance capacitors In addi-
tion ground plane shielding may be extended to
the metal case of the device since it is electrically
isolated from internal circuitry Alternatively
the case should be connected to the output to
minimize input capacitance
Offset Voltage Adjustment
The ELH0033’s offset voltages have been active-
ly trimmed by laser to meet guaranteed specifica-
tions when the offset preset pin is shorted to the
offset adjust pin The pre-calibration allows the
devices to be used in most DC or AC applications
without individually offset nulling each device If
offset null is desirable it is simply obtained by
leaving the offset preset pin open and connecting
a trim pot of 100X between the offset adjust pin
and Vb
Operation from Single or Asymmetrical
Power Supplies
This device type may be readily used in applica-
tions where symmetrical supplies are unavailable
or not desirable A typical application might be
an interface to a MOS shift register where Va e
a5V and Vb e b12V In this case an apparent
output offset occurs due to the device’s voltage
gain of less than unity This additional output
offset error may be predicted by
(V a bVb)
DVOj(1bAV)
e0 005 (VabVb)
2
where AV e No load voltage gain typically 0 99
Va e Positive supply voltage
Vb e Negative supply voltage
For the above example DVO would be b35 mV
This may be adjusted to zero as described in Sec-
tion 2 For AC coupled applications no addition-
al offset occurs if the DC input is properly biased
as illustrated in the ‘‘typical applications’’ sec-
tion
Short Circuit Protection
In order to optimize transient response and out-
put swing output current limit has been omitted
from the ELH0033 Short circuit protection may
be added by inserting appropriate value resistors
between Va and VCa pins and Vb and VCb
pins Resistor values may be predicted by
Va Vb
RLIM j ISC e ISC
where ISC s 100 mA for ELH0033
The inclusion of limiting resistors in the collec-
tors of the output transistors reduces output volt-
age swing Decoupling VCa and VCb pins with
capacitors to ground will retain full output swing
for transient pulses An alternate active current
limit technique that retains full DC output swing
uses current sources which are saturated during
normal operation thus applying full supply volt-
age to the VC pins Under fault conditions the
voltage decreases as required by the overload
RLIM
j
VBE
ISC
e
0
60
6V
mA
e
10X
Capacitive Loading
The ELH0033 is designed to drive capacitive
loads such as coaxial cables in excess of several
thousand picofarads without susceptibility to os-
cillation However peak current resulting from
(C c dv dt) should be limited below absolute
maximum peak current ratings for the devices
Thus
DVIN
Dt
c
CL
s
IOUT
s
g250
mA
In addition power dissipation resulting from
driving capacitive loads plus standby power
should be kept below the total package power
rating
PD pkg t PDC a PAC
PD pkg t (Va b Vb) c IS a PAC
PAC j (VP-P)2 c f c CL
6


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Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
where VP-PePeak-to-peak output voltage swing
f eFrequency
CL eLoad Capacitance
Operation within an Op Amp Loop
Both devices may be used as a current booster or
isolation buffer within a closed loop with op
amps such as the ELH0032 and HA2500 and
HA2600 series An isolation resistor of 47X
should be used between the op amp output and
the input of ELH0033 The wide bandwidth and
high slew rates of the ELH0033 assure that the
loop has the characteristics of the op amp and
that additional rolloff is not required
Burn-In Circuit
Hardware
In order to utilize the full drive capabilities of the
ELH0033 it should be mounted with a heatsink
particularly for extended temperature operation
The case is isolated from the circuit and may be
connected to system chassis
IMPORTANT
Power supply bypassing is necessary to prevent
oscillation with the ELH0033 in all circuits Low
inductance ceramic disc capacitors with the
shortest practical lead lengths must be connected
from each supply lead (within to of the
device package) to a ground plane Capacitors
should be one or two 0 1mF in parallel adding a
4 7 mF solid tantalum capacitor will help in trou-
blesome instances
0033 – 14
7


8001401ZX (Elantec Semiconductor)
Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
ELH0033 Macromodel
Connections
input
l Va
ll
ll
ll
ll
ll
Vca
l Vb
ll
ll
ll
Vcb
l output
ll
subckt M0033 5 12 1 10 9 11
Models
model qn npn (ise5eb14 bfe150 vafe100 ree1 rbe5 ree1 ikfe200mA
acjee5pF cjce5pF mjee 42 mjce 23 tfe 3nS tre200nS bre5 vtfe0)
model qp pnp (ise5eb14 bfe150 vafe100 rce 2 rbe3 ree1 ikfe100mA
acjee5 7pF cjce4pF tfe 3nS mjee 32 mjce 43 tre170nS bre5 vtfe0)
model qf njf (vtoeb3V betae4 0eb3 cgde4pF cgse10pF lambdae671 0eb6)
Resistors
r1 20 21 58 33
r2 27 10 58 33
r3 22 11 2
r4 11 23 2
Transistors
j1 12 5 20 qf
j4 24 10 26 qf
q2 21 21 25 qn
q3 24 24 25 qp
q5 1 21 22 qn
q6 9 24 23 qp
q7 26 26 27 qn
ends
8


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Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
ELH0033 Macromodel Contd
0033 – 16
9


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Fast Buffer Amplifier

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Fast Buffer Amplifier

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Fast Buffer Amplifier

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ELH0033G 883 8001401ZX
Fast Buffer Amplifier
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown Elantec Inc reserves the right to make changes
in the circuitry or specifications contained herein at any time without notice Elantec Inc assumes no responsibility for the use of any
circuits described herein and makes no representations that they are free from patent infringement
Elantec Inc
1996 Tarob Court
Milpitas CA 95035
Telephone (408) 945-1323
(800) 333-6314
Fax (408) 945-9305
European Office 44-71-482-4596
WARNING Life Support Policy
Elantec Inc products are not authorized for and should not be
used within Life Support Systems without the specific written
consent of Elantec Inc Life Support systems are equipment in-
tended to support or sustain life and whose failure to perform
when properly used in accordance with instructions provided can
be reasonably expected to result in significant personal injury or
death Users contemplating application of Elantec Inc products
in Life Support Systems are requested to contact Elantec Inc
factory headquarters to establish suitable terms conditions for
these applications Elantec Inc ’s warranty is limited to replace-
ment of defective components and does not cover injury to per-
sons or property or other consequential damages
12 Printed in U S A




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