The EL2140C 2141C is a very high bandwidth amplifier whose
output is in differential form and is thus primarily targeted for
applications such as driving twisted pair lines or any applica-
tion where common mode injection is likely to occur The input
signal can be in either single-ended or differential form but the
output is always in differential form
On the EL2141C two feedback inputs provide the user with the
ability to set the device gain (stable at minimum gain of two)
whereas the EL2140C comes with a fixed gain of two
The output common mode level is set by the reference pin
(V
REF
) which has a
b
3 dB bandwidth of over 100 MHz Gen-
erally this pin is grounded but it can be tied to any voltage
reference
The transmission of ADSL HDSL signals requires very low
distortion amplification so this amplifier was designed with
this as a primary goal The actual signal distortion levels de-
pend upon input and output signal amplitude as well as the
output load impedance (See distortion data inside )
Both outputs (V
OUT
V
OUTB
) are short circuit protected to
withstand temporary overload condition
Applications
Twisted pair driver
Differential line driver
VGA over twisted pair
ADSL HDSL driver
Single ended to differential
amplification
Transmission of analog signals in
a noisy environment
Connection Diagrams
EL2140C
EL2141C
Ordering Information
Part No
Temp Range
Package
Outline
EL2140CN
b
40 C to
a
85 C 8-pin PDIP MDP0031
EL2140CS
b
40 C to
a
85 C 8-pin SOIC
MDP0027
EL2141CN
b
40 C to
a
85 C 8-pin PDIP MDP0031
EL2141CS
b
40 C to
a
85 C 8-pin SOIC
MDP0027
2140-1
2140-2
October 1995 Rev A
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
EL2140C 2141C
150 MHz Differential Twisted Pair Driver
Absolute Maximum Ratings
Supply Voltage (V
CC
– V
EE
)
Maximum Output Current
Storage Temperature Range
Operating Junction Temperaure
0V – 12 6V
g
60 mA
b
65 C to
a
150 C
a
150 C
b
40 C to 85 C
Recommended Operating Temperature
a
0 8V (MIN) to V
CC
b
0 8V (MAX)
V
IN
V
INB
V
REF
V
EE
g
5V
V
IN
–V
INB
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
J
e
T
C
e
T
A
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 T
A
e
25 C and QA sample tested at T
A
e
25 C
T
MAX
and T
MIN
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 T
A
e
25 C for information purposes only
DC Electrical Characteristics
V
CC
e a
5V V
EE
e b
5V T
A
e
25 C V
IN
e
0V R
L
e
200 unless otherwise specified
Parameter
V
supply
I
S
V
OS
I
IN
Z
IN
V
DIFF
A
V
A
VOL
V
CM
V
OUT
(200)
V
OUT
(100)
V
N
V
REF
V
REFOS
PSRR
I
OUT
(min)
CMRR
R
OUT
Description
Supply Operating Range (V
CC
–V
EE
)
Power Supply Current (No Load)
Input Referred Offset Voltage
Input Bias Current (V
IN
V
INB
V
REF
)
Differential Input Impedance
Differential Input Range
Voltage Gain (EL2140C) V
IN
e
2V
pk-pk
Open Loop Voltage Gain (EL2141C)
Input Common Mode Voltage Range (EL2140C)
Output Voltage Swing (200X load V
OUT
to V
OUTB
) (EL2141C)
Output Voltage Swing (100X Load V
OUT
to V
OUTB
) (EL2141C)
Input Referred Voltage Noise
Output Voltage Control Range (EL2140C)
Output Offset Relative to V
REF
Power Supply Rejection Ratio
Minimum Output Current
Input Common Mode Rejection Ratio (EL2140C) V
CM
e
g
2V
(V
OUT
e
V
OUTB
e
0V) Output Impedence
b
2 5
b
60
b
25
b
2 6
g
3 4
g
2 9
g
3 6
g
3 1
g
2 0
Min
g
3 0
Typ
g
5 0
Max
g
6 3
Test
Level
I
I
I
I
V
I
Units
V
mA
mV
mA
kX
V
V V
dB
V
V
V
nV
11
b
25
b
20
14
40
20
10
6
400
g
2 3
1 95
1 985
75
2 02
I
V
a
4 0
I
I
I
V
36
a
3 3
a
60
S
Hz
V
I
I
I
I
I
V
mV
dB
mA
dB
X
60
50
60
70
60
70
01
2
EL2140C 2141C
150 MHz Differential Twisted Pair Driver
AC Electrical Characteristics
V
CC
e a
5V V
EE
e b
5V T
A
e
25 C V
IN
e
0V R
LOAD
e
200 unless otherwise specified
Parameter
BW(
b
3 dB)
SR
Tstl
GBW
V
REFBW
(
b
3 dB)
V
REFSR
THDf1
dP
dG
Description
b
3 dB Bandwidth (EL2140C and EL2141C
Min
gain of 2)
Typ
150
800
15
400
130
100
b
75
Max
Test
Level
V
V
V
V
V
V
V
V
V
Units
MHz
V
ms
ns
MHz
MHz
V
ms
dB
Differential Slewrate
Settling Time to 1%
Gain Bandwidth Product
V
REF
b
3 dB Bandwidth
V
REF
Slewrate
Distortion at 100 kHz (Note 1)
Differential Phase
Differential Gain
3 58 MHz
3 58 MHz
0 16
0 24
%
Note 1 Distortion measurement quoted for V
OUT
–V
OUTB
e
12V pk-pk R
LOAD
e
200X Vgain
e
8
Pin Description
Pin No
EL2140C EL2141C
1
3
1
4
4
5
6
7
8
3
5
6
7
8
2
Pin Name
V
IN
V
INB
FBP
FBN
V
REF
V
OUTB
V
CC
V
EE
V
OUT
Non-inverting Input
Inverting Input (EL2140C only)
Non-inverting Feedback Input Resistor R1 must be Connected from this Pin to V
OUT
(EL2141C only)
Inverting Feedback Input Resistor R3 must be Connected from this pin to V
OUTB
(EL2141C only)
Output Common-mode Control The Common-mode Voltage of V
OUT
and V
OUTB
will
Follow the Voltage on this Pin Note that on the EL2141 this pin is also the V
INB
pin
Inverting Output
Positive Supply
Negative Supply
Non-inverting Output
Function
3
EL2140C 2141C
150 MHz Differential Twisted Pair Driver
Typical Performance Curves
I
S
vs Supply Voltage
EL2140 Frequency Response
2140-3
2140-4
EL2141 Frequency Response vs
Resistor R2 (GAIN
e
2)
Frequency Response
vs Temperature
2140-5
2140-6
EL2141 Frequency Response vs
Resistor R2 (GAIN
e
8)
EL2141 Distortion vs Frequency
(GAIN
e
6 R
LOAD
e
200X)
V
IN
e
2V pk pk
2140-7
2140-8
4
EL2140C 2141C
150 MHz Differential Twisted Pair Driver
Typical Performance Curves
EL2140 CMRR vs Frequency
Contd
EL2141 Output Signal and Common
Mode Signal vs Frequency
2140-9
2140-10
EL2140 V
REF
Frequency Response
2140-11
2140-12
EL2140 Small Signal Response (Note 1)
Note 1 Photo shows voltages on a 100X transmission line terminated at both ends so voltages at V
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