Page 1
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
EL2176C/EL2276C December 1995, Rev B
Features
# Single (EL2176C) and dual
(EL2276C) topologies
# 1 mA supply current (per
amplifier)
# 70 MHz
b
3 dB bandwidth
# Low cost
# Fast disable
# Powers down to 0 mA
# Single- and dual-supply
operation down to
# 0.15%/0.15
§
g
1.5V
diff. gain/diff. phase
into 150X
# 800V/ms slew rate
# Large output drive current:
100 mA (EL2176C)
55 mA (EL2276C)
# Also available without disable in
single (EL2170C), dual
(EL2270C) and quad (EL2470C)
# Higher speed EL2180C/EL2186C
family also available (3 mA/
250 MHz) in single, dual and
quad
Applications
# Low power/battery applications
# HDSL amplifiers
# Video amplifiers
# Cable drivers
# RGB amplifiers
# Test equipment amplifiers
# Current to voltage converters
General Description
The EL2176C/EL2276C are single/dual current-feedback operational amplifiers which achieve a
at a gain of
a
1 while consuming only 1 mA of supply current
per amplifier. They will operate with dual supplies ranging
g
from
to
1.5V tog6V, or from single supplies ranging froma3V
a
12V. The EL2176C/EL2276C also include a disable/powerdown feature which reduces current consumption to 0 mA while
placing the amplifier output in a high impedance state. In spite
of its low supply current, the EL2276C can output 55 mA while
swinging to
g
4V ong5V supplies. The EL2176C can output
100 mA with similar output swings. These attributes make the
EL2176C/EL2276C excellent choices for low power and/or low
voltage cable-driver, HDSL, or RGB applications.
For Single, Dual and Quad applications without disable, consider the EL2170C (8-Pin Single), EL2270C (8-Pin Dual) or
EL2470C (14-Pin Quad). For higher bandwidth applications
where low power is still a concern, consider the EL2180C/
El2186C family which also comes in similar Single, Dual and
Quad configurations. The EL2180C/EL2186C family provides a
b
3 dB bandwidth of 250 MHz while consuming 3 mA of supply
current per amplifier.
b
3 dB bandwidth of 70 MHz
Connection Diagrams
EL2176C SO, P-DIP EL2276C SO, P-DIP
2176– 1
Ordering Information
Part No. Temp. Range Package Outline
EL2176CNb40§Ctoa85§C 8-Pin PDIP MDP0031
EL2176CSb40§Ctoa85§C 8-Pin SOIC MDP0027
EL2276CNb40§Ctoa85§C 14-Pin PDIP MDP0031
EL2276CSb40§Ctoa85§C 14-Pin SOIC MDP0027
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.
©
1995 Elantec, Inc.
Ý
2176– 2
Manufactured under U.S. Patent No. 5,352,989, 5,351,012, 5,418,495
Page 2
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Absolute Maximum Ratings
Voltage between V
Common-Mode Input Voltage V
Differential Input Voltage
Current into
Internal Power Dissipation See Curves
Operating Ambient Temperature Range
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 T
Test Level Test Procedure
I 100% production tested and QA sample tested per QA test plan QCX0002.
II 100% production tested at T
III QA sample tested per QA test plan QCX0002.
IV Parameter is guaranteed (but not tested) by Design and Characterization Data.
V Parameter is typical value at T
S
a
IN orbIN
a
and V
T
MAX
b
S
and T
b
A
per QA test plan QCX0002.
MIN
e
(T
25§C)
A
S
b
g
a
12.6V
to V
g
7.5 mA
Operating Junction Temperature
a
S
6V
Plastic Packages 150
Output Current (EL2176C)
Output Current (EL2276C)
Storage Temperature Range
40§Ctoa85§C
e
25§C and QA sample tested at T
e
25§C for information purposes only.
A
§
g
120 mA
g
b
e
T
J
C
e
25§C,
A
60 mA
65§Ctoa150§C
e
TA.
DC Electrical Characteristics
e
g
V
S
Parameter Description Conditions Min Typ Max
V
OS
TCV
OS
dV
OS
a
I
IN
daI
IN
b
I
IN
dbI
IN
CMRR Common Mode Rejection Ratio V
b
ICMR
PSRR Power Supply Rejection Ratio VSis moved fromg4V tog6V 60 70 I dB
b
IPSR
R
OL
a
R
IN
a
C
IN
CMIR Common Mode Input Range
5V, R
e
150X, ENABLEe0V, T
L
e
25§C unless otherwise specified
A
Input Offset Voltage 2.5 15 I mV
Average Input Offset Voltage Drift Measured from T
MIN
to T
MAX
5VmV/§C
VOSMatching EL2276C only 0.5 V mV
a
Input Current 0.5 5 I mA
a
IINMatching EL2276C only 20 V nA
b
Input Current 4 15 I mA
b
IINMatching EL2276C only 1.5 V mA
e
g
3.5 V 45 50 I dB
CM
b
Input Current Common Mode Rejection V
b
Input Current Power Supply Rejection VSis moved fromg4V tog6V 0.5 5 I mA/V
Transimpedance V
a
Input Resistance V
a
Input Capacitance 1.2 V pF
e
g
3.5V 4 10 I mA/V
CM
e
g
OUT
CM
2.5V 150 400 I kX
e
g
3.5V 1 4 I MX
g
3.5g4.0 I V
Test
Level
Units
C
TDis3.1in
2
Page 3
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
DC Electrical Characteristics
e
g
V
S
Parameter Description Conditions Min Typ Max
V
O
I
O
e
5V, R
150X, ENABLEe0V, T
L
Output Voltage Swing V
Output Current EL2176C only 80 100 I mA
Ð Contd.
e
25§C unless otherwise specified
A
e
g
5
S
ea
V
5 Single-Supply, High 4.0 V V
S
ea
V
5 Single-Supply, Low 0.3 V V
S
Test
Level
g
3.5g4.0 I V
Units
EL2276C only, per Amplifier 50 55 I mA
I
S
I
S(DIS)
C
OUT(DIS)
R
EN
I
IH
I
IL
V
DIS
V
EN
Supply Current ENABLEe2.0V, per Amplifier 1 2 I mA
Supply Current (Disabled) ENABLEe4.5V 0 20 I mA
Output Capacitance (Disabled) ENABLEe4.5V 4.4 V pF
Enable Pin Input Resistance Measured at ENABLEe2.0V, 4.5V 45 85 I kX
Logic ‘‘1’’ Input Current Measured at ENABLE, ENABLEe4.5V
Logic ‘‘0’’ Input Current Measured at ENABLE, ENABLEe0V
b
0.04 V mA
b
53 V mA
Minimum Voltage at ENABLE to Disable 4.5 I V
Maximum Voltage at ENABLE to Enable 2.0 I V
AC Electrical Characteristics
e
g
V
S
Parameter Description Conditions Min Typ Max Test Level Units
b
3dBBWb3 dB Bandwidth A
b
3dBBWb3 dB Bandwidth A
SR Slew Rate V
tr,t
f
t
pd
OS Overshoot V
ts 0.1% Settling V
dG Differential Gain A
dP Differential Phase A
dG Differential Gain A
dP Differential Phase A
t
ON
t
OFF
CS Channel Separation EL2276C only, fe5 MHz 85 V dB
Note 1: DC offset from 0V to 0.714V, AC amplitude 286 mV
Note 2: Measured from the application of the logic signal until the output voltage is at the 50% point between initial and final
e
5V, R
R
F
Rise and Fall Time V
Propagation Delay V
Turn-On Time A
Turn-Off Time A
values.
e
G
1.0 kX,R
e
150X, ENABLEe0V, T
L
ea
1 70 V MHz
V
ea
2 60 V MHz
V
e
g
OUT
OUT
OUT
OUT
OUT
V
V
V
V
V
V
2.5V, A
e
g
500 mV 4.5 V ns
e
g
500 mV 4.5 V ns
e
g
500 mV 3.0 V %
e
g
2.5V, A
ea
ea
ea
ea
ea
ea
2, R
2, R
1, R
1, R
2, V
2, V
e
L
e
L
e
L
e
L
IN
IN
e
25§C unless otherwise specified
A
ea
2 400 800 IV V/ms
V
eb
140Vns
V
150X (Note 1) 0.15 V %
150X (Note 1) 0.15 V
500X (Note 1) 0.02 V %
500X (Note 1) 0.01 V
ea
ea
e
1V, R
L
e
1V, R
L
,fe3.58 MHz.
P-P
150X (Note 2) 40 100 I ns
150X (Note 2) 1500 2000 I ns
§
§
TDis2.8in TDis2.8in
3
Page 4
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Test Circuit
(per Amplifier)
Simplified Schematic
2176– 3
(per Amplifer)
2176– 4
4
Page 5
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Performance Curves
EL2176C/EL2276C
Non-Inverting
Frequency Response (Gain)
Inverting Frequency
Response (Gain)
2176– 5
2176– 8
Non-Inverting
Frequency Response (Phase)
2176– 6
Inverting Frequency
Response (Phase)
2176– 9
Frequency Response for
Various RFand R
Frequency Response for
Various RLand C
G
L
2176– 7
2176– 10
Transimpedance (ROL)
2176– 11
PSRR and CMRR
5
2176– 12
Frequency Response
for Various C
b
IN
2176– 13
Page 6
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Performance Curves
Voltage and Current
Noise vs Frequency
2176– 14
b
3 dB Bandwith and Peaking
vs Supply Voltage for
Various Non-Inverting Gains
Ð Contd.
2nd and 3rd Harmonic
Distortion vs Frequency
b
3 dB Bandwith and Peaking
vs Supply Voltage for
Various Inverting Gains
2176– 15
Output Voltage
vs Frequency
Output Voltage Swing
vs Supply Voltage
2176– 16
Supply Current vs Supply
Voltage
2176– 17
2176– 20
Common-Mode Input Range
vs Supply Voltage
6
2176– 18
2176– 21
Slew Rate vs
Supply Voltage
2176– 19
2176– 22
Page 7
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Performance Curves
Input Bias Current vs
Die Temperature
2176– 23
b
3 dB Bandwith and Peaking
vs Die Temperature for
Various Non-Inverting Gains
2176– 26
Ð Contd.
Short-Circuit Current vs
Die Temperature
b
3 dB Bandwith and Peaking
vs Die Temperature for
Various Inverting Gains
2176– 24
2176– 27
Transimpedance (R
Die Temperature
Input Offset Voltage
vs Die Temperature
OL
)vs
2176– 25
2176– 28
Supply Current vs
Die Temperature
2176– 29
Input Voltage Range vs
Die Temperature
7
2176– 30
Slew Rate vs
Die Temperature
2176– 31
Page 8
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Performance Curves
Differential Gain and
Phase vs DC Input Voltage
at 3.58 MHz/A
ea
2
V
2176– 32
Small-Signal Step Response
Ð Contd.
Differential Gain and
Phase vs DC Input Offset
at 3.58 MHz/A
V
ea
1
Settling Time vs
Settling Accuracy
2176– 33
Large-Signal Step Response
2176– 34
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
2176– 35
2176– 37
2176– 36
8-Lead SO
Maximum Power Dissipation
vs Ambient Temperature
2176– 38
8
Page 9
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Performance Curves
14-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
2176– 39
Ð Contd.
14-Lead SO
Maximum Power Dissipation
vs Ambient Temperature
2176– 40
Channel Separation
vs Frequency (EL2276)
2176– 41
9
Page 10
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Applications Information
Product Description
The EL2176C/EL2276C are current-feedback operational amplifiers that offer a wide
bandwidth of 70 MHz, a low supply current of
1 mA per amplifier and the ability to disable to
0 mA. Both products also feature high output
current drive. The EL2176C can output 100 mA,
while the EL2276C can output 55 mA per amplifier. The EL2176C/EL2276C work with supply
voltages ranging from a single 3V to
they are also capable of swinging to with in 1V of
either supply on the input and the output. Because of their current-feedback topology, the
EL2176C/EL2276C do not have the normal gainbandwidth product associated with voltage-feedback operational amplifiers. This allows their
b
3 dB bandwidth to remain relatively constant
as closed-loop gain is increased. This combination of high bandwidth and low power, together
with aggressive pricing make the EL2176C/
EL2276C the ideal choice for many low-power/
high-bandwidth applications such as portable
computing, HDSL, and video processing.
For Single, Dual and Quad applications without
disable, consider the EL2170C (8-Pin Single),
EL2270C (8-Pin Dual) and EL2470C (14-Pin
Quad). If more AC performance is required, refer
to the EL2180C/EL2186C family which provides
Singles, Duals, and Quads with 250 MHz of
bandwidth while consuming 3 mA of supply current per amplifier.
Power Supply Bypassing and Printed
Circuit Board Layout
As with any high-frequency device, good printed
circuit board layout is necessary for optimum
performance. Ground plane construction is highly recommended. Lead lengths should be as short
as possible. The power supply pins must be well
bypassed to reduce the risk of oscillation. The
combination of a 4.7 mF tantalum capacitor in
parallel with a 0.1 mF capacitor has been shown
to work well when placed at each supply pin.
For good AC performance, parasitic capacitance
should be kept to a minimum especially at the
inverting input (see the Capacitance at the Inverting Input section). Ground plane construc-
b
g
6V, and
3dB
tion should be used, but it should be removed
from the area near the inverting input to minimize any stray capacitance at that node. Carbon
or Metal-Film resistors are acceptable with the
Metal-Film resistors giving slightly less peaking
and bandwidth because of their additional series
inductance. Use of sockets, particularly for the
SO package should be avoided if possible. Sockets add parasitic inductance and capacitance
which will result in some additional peaking and
overshoot.
Disable/Power-Down
The EL2176C/EL2276C amplifiers can be disabled, placing their output in a high-impedance
state. When disabled, each amplifier’s supply current is reduced to 0 mA. Each EL2176C/
EL2276C amplifier is disabled when its
ENABLE
0.5V of the positive supply. Similarly, each amplifier is enabled by pulling its ENABLE
least 3V below the positive supply. For
plies, this means that an EL2176C/EL2276C amplifier will be enabled when ENABLE
less, and disabled when ENABLE
Although the logic levels are not standard TTL,
this choice of logic voltages allows the EL2176C/
EL2276C to be enabled by tying ENABLE
ground, even in
The ENABLE
outputs or open-collector TTL.
When enabled, supply current does vary somewhat with the voltage applied at ENABLE
example, with the supply voltages of the
EL2176C at
(rather than ground) the supply current will increase about 15% to 1.15 mA.
pin is floating or pulled up to within
pin at
g
5V sup-
is at 2V or
is above 4.5V.
a
3V single-supply applications.
pin can be driven from CMOS
g
5V, if ENABLE is tied tob5V
to
. For
Capacitance at the Inverting Input
Any manufacturer’s high-speed voltage- or current-feedback amplifier can be affected by stray
capacitance at the inverting input. For inverting
gains this parasitic capacitance has little effect
because the inverting input is a virtual ground,
but for non-inverting gains this capacitance (in
conjunction with the feedback and gain resistors)
creates a pole in the feedback path of the amplifier. This pole, if low enough in frequency, has the
same destabilizing effect as a zero in the forward
open-loop response. The use of large value feed-
10
Page 11
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Applications Information
Ð Contd.
back and gain resistors further exacerbates the
problem by further lowering the pole frequency.
The EL2176C/EL2276C have been specially designed to reduce power dissipation in the feedback network by using large 1.0 kX feedback and
gain resistors. With the high bandwidths of these
amplifiers, these large resistor values would normally cause stability problems when combined
with parasitic capacitance, but by internally canceling the effects of a nominal amount of parasitic capacitance, the EL2176C/EL2276C remain
very stable. For less experienced users, this feature makes the EL2176C/EL2276C much more
forgiving, and therefore easier to use than other
products not incorporating this proprietary circuitry.
The experienced user with a large amount of PC
board layout experience may find in rare cases
that the EL2176C/EL2276 C have less bandwidth than expected. In this case, the inverting
input may have less parasitic capacitance than
expected by the internal compensation circuitry
of the EL2176C/EL2276C. The reduction of feedback resistor values (or the addition of a very
small amount of external capacitance at the inverting input, e.g., 0.5 pF) will increase bandwidth as desired. Please see the curves for Frequency Response for Various R
Frequency Response for Various C
and RG, and
F
.
b
IN
Feedback Resistor Values
The EL2176C/EL2276C have been designed and
specified at gains of
a
1 anda2 with R
e
F
1.0 kX. This value of feedback resistor gives
70 MHz of
b
3 dB bandwidth at A
about 1.5 dB of peaking, and 60 MHz of
bandwidth at A
V
ea
2 with about 0.5 dB of
V
ea
1 with
b
3dB
peaking. Since the EL2176C/EL2276C are current-feedback amplifiers, it is also possible to
change the value of R
to get more bandwidth.
F
As seen in the curve of Frequency Response For
Various R
and RG, bandwidth and peaking can
F
be easily modified by varying the value of the
feedback resistor.
Because the EL2176C is a current-feedback amplifier, the gain-bandwidth product is not a constant for different closed-loop gains. This feature
actually allows the EL2176C/EL2276C to main-
b
tain about the same
3 dB bandwidth, regardless of closed-loop gain. However, as closed-loop
gain is increased, bandwidth decreases slightly
while stability increases.
Since the loop stability is improving with higher
closed-loop gains, it becomes possible to reduce
the value of R
below the specified 1.0 kX and
F
still retain stability, resulting in only a slight loss
of bandwidth with increased closed-loop gain.
Supply Voltage Range and SingleSupply Operation
The EL2176C/EL2276C have been designed to
operate with supply voltages having a span of
greater than 3V, and less than 12V. In practical
terms, this means that the EL2176C/EL2276C
will operate on dual supplies ranging from
g
to
6V. With a single-supply, the EL2176C will
operate from
a
3V toa12V.
g
1.5V
As supply voltages continue to decrease, it becomes necessary to provide input and output
voltage ranges that can get as close as possible to
the supply voltages. The EL2176C/EL2276C
have an input voltage range that extends to within 1V of either supply. So, for example, on a sin-
a
gle
5V supply, the EL2176C/EL2276C have an
input range which spans from 1V to 4V. The output range of the EL2176C /EL2276C is also quite
large, extending to within 1V of the supply rail.
g
On a
5V supply, the output is therefore capable
of swinging from
b
4V toa4V. Single-supply
output range is even larger because of the increased negative swing due to the external pulldown resistor to ground. On a single
a
5V sup-
ply, output voltage range is about 0.3V to 4V.
Video Performance
For good video performance, an amplifier is required to maintain the same output impedance
and the same frequency response as DC levels are
changed at the output. This is especially difficult
when driving a standard video load of 150X, because of the change in output current with DC
level. Until the EL2176C/EL2276C, good Differential Gain could only be achieved by running
high idle currents through the output transistors
(to reduce variations in output impedance).
These currents were typically in excess of the
11
Page 12
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Applications Information
Ð Contd.
entire 1 mA supply current of each EL2176C/
EL2276C amplifier! Special circuitry has been incorporated in the EL2176C/EL2276C to reduce
the variation of output impedance with current
output. This results in dG and dP specifications
of 0.15% and 0.15
a
of
2.
while driving 150X at a gain
§
Video Performance has also been measured with
a 500X load at a gain of
a
1. Under these conditions, the EL2176C/EL2276C have dG and dP
specifications of 0.01% and 0.02
while driving 500X at A
ea
V
§
1.
respectively
Output Drive Capability
In spite of its low 1 mA of supply current, the
EL2176C is capable of providing a minimum of
g
80 mA of output current. Similarly, each amplifier of the EL2276C is capable of providing a
minimum of
g
50 mA. These output drive levels
are unprecedented in amplifiers running at these
supply currents. With a minimum
g
80 mA of
output drive, the EL2176C is capable of driving
50X loads to
g
4V, making it an excellent choice
for driving isolation transformers in telecommunications applications. Similarly, the
g
50 mA
minimum output drive of each EL2276C amplifier allows swings of
g
2.5V into 50X loads.
Driving Cables and Capacitive Loads
When used as a cable driver, double termination
is always recommended for reflection-free performance. For those applications, the back-termination series resistor will decouple the EL2176C/
EL2276C from the cable and allow extensive capacitive drive. However, other applications may
have high capacitive loads without a back-termination resistor. In these applications, a small series resistor (usually between 5X and 50X) can be
placed in series with the output to eliminate most
peaking. The gain resistor (R
) can then be cho-
G
sen to make up for any gain loss which may be
created by this additional resistor at the output.
In many cases it is also possible to simply increase the value of the feedback resistor (R
F
)to
reduce the peaking.
Current Limiting
The EL2176C/EL2276C have no internal current-limiting circuitry. If any output is shorted,
it is possible to exceed the Absolute Maximum
Ratings for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
With the high output drive capability of the
EL2176C/EL2276C, it is possible to exceed the
150
C Absolute Maximum junction temperature
§
under certain very high load current conditions.
Generally speaking, when R
falls below about
L
25X, it is important to calculate the maximum
junction temperatu re (T
) for the application
Jmax
to determine if power-supply voltages, load conditions, or package type need to be modified for
the EL2176C/EL2276C to remain in the safe operating area. These parameters are calculated as
follows:
T
JMAX
e
T
MAX
a
(iJA* n * PD
MAX
[1]
)
where:
T
i
JA
n
MAX
e
Maximum Ambient Temperature
e
Thermal Resistance of the Package
e
Number of Amplifiers in the Package
MAX
e
Maximum Power Dissipation of
PD
Each Amplifier in the Package.
PD
for each amplifier can be calculated as
MAX
follows:
PD
MAX
(V
e
(2 * VS* I
b
S
V
OUTMAX
SMAX
)
) * (V
OUTMAX/RL
a
))[2
where:
V
S
I
SMAX
e
Supply Voltage
e
Maximum Supply Current of 1
Amplifier
V
OUTMAX
e
Max. Output Voltage of the Application
R
L
e
Load Resistance
]
12
Page 13
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Application Circuits
Low Power Multiplexer with Single-Ended TTL Input
EL2176C/EL2276C
2176– 42
13
Page 14
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Application Circuits
Inverting 200 mA Output Current Distribution Amplifier
Ð Contd.
2176– 43
14
Page 15
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Application Circuits
Differential Line-Driver/Receiver
Ð Contd.
2176– 44
15
Page 16
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
Typical Application Circuits
Fast-Settling Precision Amplifier
Ð Contd.
2176– 45
16
Page 17
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
EL2176C/EL2276C Macromodel
* Revision A, March 1995 * Transimpedance Stage
* AC characteristics used Rf
* Connections:
*
*
*
*
*
.subckt EL2176/el 32746 q141819qp
* q271820qn
*Input Stage q3 7 19 21 qn
* q442022qp
e1100301.0 r72164
vis1090V r82264
h2 9 12 vxx 1.0 ios1 7 19 0.4mA
r1 2 11 165 ios2 20 4 0.4mA
l1 11 12 25nH *
iinp 3 0 0.5uA * Supply Current
iinm 2 0 4uA *
r12 3 0 4Meg ips741nA
**
*Slew Rate Limiting * Error Terms
**
h1 13 0 vis 600 ivos 0 23 2mA
r2 13 14 1K vxx 23 0 0V
d1 14 0 dclamp e4 240301.0
d2 0 14 dclamp e5 250701.0
* e626040
* High Frequency Pole r9 24 23 0.316K
* r10 25 23 3.2K
e2 30 0 14 0 0.00166666666 r11 26 23 3.2K
l3 30 17 0.5uH *
c5 17 0 0.69pF * Models
r5 17 0 300 *
* .model qn npn(is
eRge
a
input g1 0 18 17 0 1.0
l
ll
lll
llll
lllll
1KX,RLe150X *
b
input rol 18 0 400K
a
Vsupply cdp 18 0 1.9pF
b
Vsupply *
output * Output Stage
*
.model qp pnp(is
.model dclamp d(is
abve
.ends
b
1. 0
1.3v ne4)
e
5e-15 bfe200 tfe0.01nS)
e
5e-15 bfe200 tfe0.01nS)
e
1e-30 ibve0.266
TDis5.2in
17
Page 18
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
EL2176C/EL2276C Macromodel
Ð Contd.
2176– 46
18
Page 19
BLANK
19
Page 20
EL2176C/EL2276C
70 MHz/1 mA Current Mode Feedback Amp w/Disable
EL2176C/EL2276CDecember 1995, Rev B
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.
WARNING Ð 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-
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
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 replacement of defective components and does not cover injury to persons or property or other consequential damages.
Printed in U.S.A.20
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