ELANT EL2141CS, EL2141CN, EL2140CS, EL2140CN Datasheet

EL2140C/2141C

150 MHz Differential Twisted Pair Driver

EL2140C/2141C October 1995, Rev A

Features

# Fully differential inputs, outputs,

and feedback

# Differential input range

g

2.3V

# 150 MHz 3 dB bandwidth
# 800 V/ms slew rate

b

#

55 dB distortion at 3 MHz

b

#

75 dB distortion at 100 kHz

g

#

5V supplies ora6V single

supply

# 50 mA minimum output current
# Output swing (200X load) to

within 1.5V of supplies
(14V pk-pk differential)

# Low power-11 mA typical supply

current

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

General Description

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 applica­tion 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

), which has ab3 dB bandwidth of over 100 MHz. Gen-

REF

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 de­pend upon input and output signal amplitude, as well as the
output load impedance. (See distortion data inside.)

Both outputs (V

OUT,VOUTB

) are short circuit protected to

withstand temporary overload condition.

Connection Diagrams

EL2140C EL2141C

Ordering Information

Part No. Temp. Range Package Outline

EL2140CNb40§Ctoa85§C 8-pin PDIP MDP0031

EL2140CSb40§Ctoa85§C 8-pin SOIC MDP0027

EL2141CNb40§Ctoa85§C 8-pin PDIP MDP0031

EL2141CSb40§Ctoa85§C 8-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

2140-1 2140-2

EL2140C/2141C

150 MHz Differential Twisted Pair Driver

Absolute Maximum Ratings

e

J

Test

Level

b
b

CC

e

T

C

40§Cto85§C

0.8V (MAX)

g

TA.

Units

5V

Supply Voltage (VCC–VEE) 0V–12.6V
Maximum Output Current
Storage Temperature Range
Operating Junction Temperaure

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

DC Electrical Characteristics

ea

V

CC

5V, V

EE

T

eb

MAX

5V, T

and T

A

per QA test plan QCX0002.

MIN

e

25§C, V

IN

g

b

A

e

60 mA

65§Ctoa150§C

a

150§C

e

25§C and QA sample tested at T

e

25§C for information purposes only.

A

e

0V, R

L

Recommended Operating Temperature
V

IN,VINB,VREF

V

IN–VINB

e

25§C,

A

200, unless otherwise specified

a

V

0.8V (MIN) to V

EE

Parameter Description Min Typ Max

V

supply

I

S

V

OS

I

IN

Z

IN

V

DIFF

A

V

A

VOL

V

CM

V

(200) Output Voltage Swing (200X load, V

OUT

V

(100) Output Voltage Swing (100X Load, V

OUT

V

N

V

REF

V

REFOS

Supply Operating Range (VCC–VEE)

Power Supply Current (No Load) 11 14 I mA

Input Referred Offset Voltage

Input Bias Current (VIN,V

Differential Input Impedance 400 V kX

Differential Input Range

Voltage Gain (EL2140C) V

Open Loop Voltage Gain (EL2141C) 75 V dB

Input Common Mode Voltage Range (EL2140C)

Input Referred Voltage Noise 36 V nV/SHz

Output Voltage Control Range (EL2140C)

Output Offset Relative to V

INB,VREF

e

2V

IN

REF

)

pk-pk

OUT

OUT

to V

to V

) (EL2141C)

OUTB

) (EL2141C)g2.9g3.1 I V

OUTB

g

3.0g5.0g6.3 I V

b

25 10 40 I mV

b

20 6 20 I mA

g

2.0g2.3 I V

1.95 1.985 2.02 I V/V

b

2.6

g

3.4g3.6 I V

b

2.5

b60b

a

4.0 I V

a

3.3 I V

a

25

60 I mV

PSRR Power Supply Rejection Ratio 60 70 I dB

I

(min) Minimum Output Current 50 60 I mA

OUT

e

CMRR Input Common Mode Rejection Ratio (EL2140C) V

R

OUT

e

(V

OUT

V

OUTB

e

0V) Output Impedence 0.1 V X

g

2V 60 70 I dB

CM

TDis0.3inTDis3.7in

2

EL2140C/2141C

150 MHz Differential Twisted Pair Driver

AC Electrical Characteristics

ea

V

CC

Parameter Description Min Typ Max

BW(b3 dB)

SR Differential Slewrate 800 V V/ms

Tstl Settling Time to 1% 15 V ns

GBW Gain Bandwidth Product 400 V MHz

V

REFBW

V

REFSR

THDf1 Distortion at 100 kHz (Note 1)

dP Differential Phase@3.58 MHz 0.16 V

dG Differential Gain@3.58 MHz 0.24 V %

Note 1: Distortion measurement quoted for V

Pin Description

Pin No.

EL2140C EL2141C

12VINNon-inverting Input

3V

43V

55V

66VCCPositive Supply

77VEENegative Supply

88V

eb

5V, V

EE

(b3 dB) V

1 FBP Non-inverting Feedback Input. Resistor R1 must be Connected from this Pin to V

4 FBN Inverting Feedback Input. Resistor R3 must be Connected from this pin to V

e

5V, T

b

REF

V

REF

25§C, V

A

3 dB Bandwidth (EL2140C and EL2141C@gain of 2) 150 V MHz

b

3 dB Bandwidth 130 V MHz

Slewrate 100 V V/ms

Pin Name Function

INB

REF

OUTB

OUT

e

0V, R

IN

OUT–VOUTB

Inverting Input (EL2140C only)

(EL2141C only)

(EL2141C only)

Output Common-mode Control. The Common-mode Voltage of V
Follow the Voltage on this Pin. Note that on the EL2141, this pin is also the V

Inverting Output

Non-inverting Output

LOAD

e

200, unless otherwise specified

e

12V pk-pk, R

LOAD

e

b

75 V dB

200X, Vgaine8.

OUT

Test

Level

and V

OUTB

OUTB

INB

OUT

.

will
pin.

Units

§

TDis2.0in

.

3

EL2140C/2141C

150 MHz Differential Twisted Pair Driver

Typical Performance Curves

ISvs Supply Voltage

EL2141 Frequency Response vs
Resistor R2 (GAINe2)

2140-3

EL2140 Frequency Response

Frequency Response
vs Temperature

2140-4

EL2141 Frequency Response vs
Resistor R2 (GAINe8)

2140-5

2140-7

2140-6

EL2141 Distortion vs Frequency
(GAIN
V

IN

e

e

2V pk/pk

6, R

LOAD

e

200X)

2140-8

4