EL2280CN - Intersil Corporation

FN7055

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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EL2180, EL2280, EL2480

250MHz/3mA Current Mode Feedback

Amplifiers

The EL2180, EL2280, and EL2480 are

single, dual, and quad current-

feedback operational amplifiers which

achie ve a -3dB bandwidth of 250MHz at a gain of +1 while

consuming only 3mA of supply current per amplifier. They

will operate with dual supplies ranging from ±1.5V to ±6V, or

from single supplies ranging from +3V to +12V. In spite of

their low supply current, the EL2480 and the EL2280 can

output 55mA while swinging to ±4V on ±5V supplies. The

EL2180 can output 100mA with similar output swings. These

attributes make the EL2180, EL2280, and EL2480 excellent

choices for lo w power and/or low v oltage cable-driver , HDSL,

or RGB applications.

F or applications where board space is extremely critical, the

EL2180 is available in the tiny 5-pin SOT-23 package, which

has a footprint 28% the size of an 8-pin SO.

F or single, dual, and triple applications with disable, consider

the EL2186 (8-pin single), EL2286 (1 4-pin dual), or EL2386

(16-pin triple). For lower power applications where speed is

still a concern, consider the EL2170/EL2 176 family which

also comes in similar single, dual, and quad configurations.

The EL2170/EL2176 family provides a -3dB bandwidth of

70MHz while consuming 1mA of supply current per amplifier .

NOTE:

*EL2180CW symbol is .Cxxx where xxx represents date code

Features

• Single (EL2180), dual (EL2280), and quad (EL2480)

topologies

• 3mA supply current (per amplifier)

• 250MHz -3dB bandwidth

• Tiny SOT23-5 package (EL2180)

• Low cost

• Single- and dual-supply operation down to ±1.5V

• 0.05%/0.05° diff. gain/diff. phase into 150Ω

• 1200V/µs slew rate

• Large output drive current - 100mA (EL2180), 55mA

(EL2280), 55mA (EL2480)

• Also available with disable in single (EL2186), dual

(EL2286), and triple (EL2386)

• Lower power EL2170/EL2176 family available

(1mA/70MHz) in single, dual, and quad

Applications

• Low power/battery applica tio ns

• HDSL amplifiers

• Video amplifiers

• Cable drivers

• RGB amplifiers

• Test equipment amplifiers

• Current to voltage conver ters

Ordering Information

PART NUMBER PACKAGE TAPE & REEL PKG. NO.

EL2180CN 8-Pin PDIP - MDP0031

EL2180CS 8-Pin SO - MDP0027

EL2180CS-T7 8-Pin SO 7” MDP0027

EL2180CS-T13 8-Pin SO 13” MDP0027

EL2180CW-T7 5-Pin SOT-23* 7” MDP0038

EL2180CW-T13 5-Pin SOT-23* 13” MDP0038

EL2280CN 8-Pin PDIP - MDP0031

EL2280CS 8-Pin SO - MDP0027

EL2280CS-T7 8-Pin SO 7” MDP0027

EL2280CS-T13 8-Pin SO 13” MDP0027

EL2480CN 14-Pin PDIP - MDP0031

EL2480CS 14-Pin SO - MDP0027

EL2480CS-T7 14-Pin SO 7” MDP0027

EL2480CS-T13 14-Pin SO 13” MDP0027

Data Sheet November 14,2002

Pinouts EL2180

(8-PIN SO, PDIP)

TOP VIEW

EL2280

(8-PIN SO, PDIP)

TOP VIEW

EL2180

(5-PIN SOT 23)

TOP VIEW

EL2480

(14-PIN SO, PDIP)

TOP VIEW

EL2180, EL2280, EL2480

Absolute Maximum Ratings (TA = 25°C)

Supply Voltage between VS+ and GND. . . . . . . . . . . . . . . . . +12.6V

Voltage between VS+ and VS-. . . . . . . . . . . . . . . . . . . . . . . . +12.6V

Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . VS- to VS+

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±6V

Current into +IN or -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±7.5mA

Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves

Operating Ambient Temperature Range . . . . . . . . . .-40°C to +85°C

Operating Junction Temperature

Plastic Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C

Output Current (EL2180). . . . . . . . . . . . . . . . . . . . . . . . . . . ±120mA

Output Current (EL2280). . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60mA

Output Current (EL2480). . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60mA

Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the

device at these or any other conditi ons above those indicated in the operational sections of this specification is not implied.

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information pur poses only. Unless otherwise noted, all tests

are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA

DC Electrical Specificat ions VS = ±5V, RL = 150Ω, TA = 25°C unless otherwise specified

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

VOS Input Offset Voltage 2.5 10 mV

TCVOS Average Input Offset Voltage Drift Measured from TMIN to TMAX 5µV/°C

dVOS VOS Matching EL2280, EL2480 only 0.5 mV

+IIN +Input Current 1.5 15 µA

d+IIN +IIN Matching EL2280, EL2480 only 20 nA

-IIN -Input Current 16 40 µA

d-IIN -IIN Matching EL2280, EL2480 only 2 µA

CMRR Common Mode Rejection Ratio VCM = ±3.5V 45 50 dB

-ICMR -Input Current Common Mode

Rejection VCM = ±3.5V 5 30 µA/V

PSRR Power Supply Rejection Ratio VS is moved from ±4V to ±6V 60 70 dB

-IPSR - Input Current Power Supply

Rejection VS is moved from ±4V to ±6V 1 15 µA/V

ROL Transimpedance VOUT = ±2.5V 120 300 kΩ

+RIN +Input Resistance VCM = ±3.5V 0.5 2 MΩ

+CIN +Input Capacitance 1.2 pF

CMIR Common Mode Input Range ±3.5 ±4.0 V

VOOutput Voltage Swing VS = ±5 ±3.5 ±4.0 V

VS = 5 single-supply, high 4.0 V

VS = 5 single-supply, low 0.3 V

IOOutput Current EL2180 only 80 100 mA

EL2280 only, per amplifier 50 55 mA

EL2480 only, per amplifier 50 55 mA

ISSupply Current Per amplifier 3 6 mA

EL2180, EL2280, EL2480

AC Electrical Specifications VS=±5V, R

F=R

G= 750Ω for PDIP and SO packages, RF=R

G= 560Ω for SOT23-5 package,

RL= 150Ω, TA= 25°C unless otherwise specified

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

-3dB BW -3dB Bandwidth AV = 1 250 MHz

-3dB BW -3dB Bandwidth AV = 2 180 MHz

0.1dB BW 0.1dB Bandwidth AV = 2 50 MHz

SR Slew Rate VOUT = ±2.5V, AV = 2 600 1200 V/µs

tR, tFRise and Fall Time VOUT = ±500mV 1.5 ns

tPD Propagation Delay VOUT = ±500mV 1.5 ns

OS Overshoot VOUT = ±500mV 3.0 %

tS0.1% Settling VOUT = ±2.5V, AV = -1 15 ns

dG Differential Gain AV = 2, RL = 150Ω (Note 1) 0.05 %

dP Differential Phase AV = 2, RL = 150Ω (Note 1) 0.05 °

dG Differential Gain AV = 1, RL = 500Ω (Note 1) 0.01 %

dP Differential Phase AV = 1, RL = 500Ω (Note 1) 0.01 °

CSChannel Separation EL2280, EL2480 only, f = 5MHz 85 dB

NOTE:

1. DC offset from 0V to 0.714V, AC amplitude 286mVP-P, f = 3.58MHz

EL2180, EL2280, EL2480

Test Circuit (per Amplifier)

Simplified Schematic (per Amplifier)

EL2180, EL2280, EL2480

Typical Performance Curves

Non-Inverting Frequency

Response (Gain)

(PDIP and SO Packages)

Non–Inverting Frequency

Response (Phase)

(PDIP and SO Packages)

Frequency Response

for Various RF and RG

(PDIP and SO Packages)

Inverting Frequency

Response (Gain)

(PDIP and SO Packages)

Inverting Frequency

Response (Phase)

(PDIP and SO Packages)

Frequency Response

for Various RL and CL

(PDIP and SO Packages)

Frequency Response for

Various CIN-

PSRR and CMRR

vs Frequency

Transimpedance (ROL) vs

Frequency

Ω

EL2180, EL2280, EL2480

Typical Performance Curves (Continued)

Voltage and Current

Noise vs Frequency 2nd and 3rd Harmonic

Distortion vs Frequency Output Voltage

Swing vs Frequency

Output Voltage Swing

vs Supply Voltage

-3dB Bandwidth and Peaking

vs Supply Voltage for

Various Inverting Gains

-3dB Bandwidth and Peaking

vs Supply Voltage for

Various Non-Inverting Gains

Supply Current vs Supply Voltage Common-Mode Input Range

vs Supply Voltage Slew Rate vs Supply Voltage

EL2180, EL2280, EL2480

Typical Performance Curves (Continued)

Input Bias Current

vs Die Temperature Short-Circuit Current

vs Die Temperature Transimpedance (ROL)

vs Die Temperature

-3dB Bandwidth and Peaking

vs Die Temperature for

Various Non-Inverting Gains

-3dB Bandwidth vs

Die Temperature for

Various Inverting Gains Input Offset Voltage

vs Die Temperature

Slew Rate vs Die Temperature

Input Voltage Range

vs Die Temperature

Supply Current vs Die Temperature

EL2180, EL2280, EL2480

Typical Performance Curves (Continued)

Differential Gain and

Phase vs DC Input

Voltage at 3.58MHz

Differential Gain and

Phase vs DC Input

Voltage at 3.58MHz Settling Time vs

Settling Accuracy

Small-Signal Step Response Large-Signal Step Response

5-Pin Plastic SOT-23

Maximum Power Dissipation

vs Ambient Temperature

8-Pin Plastic DIP

Maximum Power Dissipation

vs Ambient Temperature

8-Pin SO

Maximum Power Dissipation

vs Ambient Temperatur e

EL2180, EL2280, EL2480

Typical Performance Curves (Continued)

14-Pin Plastic DIP

Maximum Power Dissipation

vs Ambient Temperature

14-Pin SO

Maximum Power Dissipation

vs Ambient Temperature Channel Separation

vs Frequency

Non-Inverting Frequency

Response (Gain)

(SOT23-5 Package)

Non-Inverting Frequency

Response (Phase)

(SOT23-5 Package)

Frequency Response for

Various RF and RG

(SOT23-5 Package)

Inverting Frequency

Response (Gain)

(SOT23-5 Package)

Inverting Frequency

Response (Phase)

(SOT23-5 Pa ckage)

EL2180, EL2280, EL2480

Applications Information

Product Description

The EL2180, EL2280, and EL2480 are current-feedback

operational amplifiers that offer a wide -3dB bandwidth of

250MHz and a low supply current of 3mA per amplifier . All of

these products also feature high output current drive. The

EL2180 can output 100mA, while the EL2280 and the

EL2480 can output 55mA per amplifier. The EL2180,

EL2280, and EL2480 work with supply voltages ranging from

a single 3V to ±6V, and they are also capable of swinging to

within 1V of either supply on the input and the output.

Because of their current-feedback topology, the EL2180,

EL2280, and EL2480 do not have the normal gain-

bandwidth product associated with voltage-feedback

operational amplifiers. This allows their -3dB 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 EL2180, EL2280, and

EL2480 the ideal choice for many lo w-power/high-bandwidth

applications such as portable computing, HDSL, and video

processing.

F or applications where board space is extremely critical, the

EL2180 is available in the tiny 5-pin SOT-23 package, which

has a footprint 28% the size of an 8-pin SO. The EL2180,

EL2280, and EL2480 are each also available in industry

standard pinouts in PDIP and SO packages.

F or single, dual and triple applications with disable , consider

the EL2186 (8-pin single), EL2286 (14-pin dual) and EL2386

(16-pin triple). If lower power is required, refer to the

EL2170/EL2176 family which provides singles, duals, and

quads with 70MHz of bandwidth while consuming 1mA of

supply current per amplifier.

Power Supply Bypassing and Printed Circuit

Board Layout

As with any high-frequency device, good printed circuit

board lay out is necessary for optimum perf ormance. 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 4.7µF tantalum capacitor in parallel with a

0.1µF capacitor has been shown to work well when placed at

each suppl y pin.

For good AC performance, parasitic capacitance sh ould be

kept to a minimum especially at the inverting input (see the

Capacitance at the Inverting Input section). Ground plane

construction should be used, but it should be removed from

the area near the inverting input to minimize any str ay

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.

Capacitance at the Inverting Input

Any manufacturer's high-speed voltage- or current-feedbac k

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 virtua l

ground, but for non-inverting gains this capacitance (in

conjunction with the f eedbac k 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 feedback and gain resistors further exacerbates the

problem by further lowering the pole frequency.

The experienced user with a large amount of PC board

layout experience may find in rare cases that the EL2180,

EL2280, and EL2480 have less bandwidth than expected.

The reduction of feedback resistor values (or the addition of

a very small amount of external capacitance at the inverting

input, e.g. 0.5pF) will increase bandwidth as desired. Please

see the curves for Frequency Response for Various RF and

RG, and F r equency Response for Various CIN-.

Feedback Resistor Values

The EL2180, EL2280, and EL2480 hav e been designed and

specified at gains of +1 and +2 with RF = 750Ω in PDIP and

SO packages and RF = 560Ω in SOT23-5 package. These

values of f eedback resistors giv e 250MHz of -3dB bandwidth

at AV = +1 with about 2.5dB of peaking, and 180MHz of -3dB

bandwidth at AV = +2 with about 0.1dB of peaking. The

SOT23-5 packag e i s cha r acterized w it h a sma l le r value of

feedback resistor, for a given bandwidth, to compensate for

lower parasitics within both the package itself and the printed

circuit board where it will be placed. Since the EL2180,

EL2280, and EL2480 are current-feedback amplifiers, it is

also possible to change the value of RF to get more

bandwidth. As seen in the curve of F requency Response For

Various RF and RG, bandwidth and peaking can be easily

modified by varying the value of the fee dback resistor.

Because the EL2180, EL2280, and EL2480 are current-

f eedback amplifiers, their gain-bandwidth product is not a

constant for diff erent closed-loop gains. This f eature actually

allows the EL2180, EL2280, and EL2480 to maintain about

the same -3dB bandwidth, regard less of clos ed-loop gain.

However, as cl osed-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 RF below the

specified 560Ω and 750Ω and still retain stability, resulting in

only a slight loss of bandwidth with increased closed-loop

gain.

EL2180, EL2280, EL2480

Supply Voltage Range and Single-Supply

Operation

The EL2180, EL2280, and EL2480 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

EL2180, EL2280, and EL2480 will operate on dual supplies

ranging from ±1.5V to ±6V. With a single-supply, the EL2180,

EL2280, and EL2480 will operate from +3V to +12V.

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

EL2180, EL2280, and EL 2480 have an input voltage range

that extends to within 1V of either supply. So , for e xample, on

a single +5V supply, the EL2180, EL2280, and EL2480 hav e

an input range which spans from 1V to 4V. The output r ange

of the EL2180, EL2280, and EL2480 is also quite large,

extending to within 1V of the supply rail. On a ±5V supply,

the output is therefore capable of swinging from -4V to +4V.

Single-supply output range is even larger because of the

increased negative swing due to the external pull-down

resistor to ground. On a single +5V supply, outp ut 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 le v els are changed at the output.

This is especially difficult when driving a standard video load

of 150Ω, because of the change in output current with DC

level. Until the EL2180, EL2280, and EL2480, good

Diff erential Gain could only be achieved by running high idle

currents through the output transistors (to reduce variations

in output impedance). These currents were typically

comparable to the entire 3mA supply current of each

EL2180, EL2280, and EL2480 amplifier! Special circuitry

has been incorporated in the EL2180, EL2280, and EL2480

to reduce the variation of output impedance with current

output. This results in dG and dP specifications of 0.05%

and 0.05° while driving 15 0 Ω at a gain of +2.

Video performance has also been measured with a 500Ω

load at a gain of +1. Under these conditions, the EL2180,

EL2280, and EL2480 have dG and dP specifications of

0.01% and 0.01° respectively while driving 500Ω at AV = +1.

Output Drive Capability

In spite of its low 3mA of supply cu rrent, the EL2180 is

capable of pro v iding a minim u m of ±80mA of output current.

Similarly, each amplifier of the EL2280 and the EL2480 is

capable of pro viding a minimum of ±50mA. These output drive

le vels are u nprecedented in amplifiers running at these supply

currents. With a minimu m ±80mA of output drive , the EL2180

is capable of driving 50Ω loads to ±4V, making it an excellent

choice f or driving isolation tr ansformers in

telecommunications app lications . Similarly, the ±50mA

minimum output drive of each EL228 0 and EL2480 amplifie r

allows swings of ±2.5V into 50Ω loads .

Driving Cables and Capacitive Loads

When used as a cabl e driv er, double termination is always

recommended for reflection-free performance. For those

applications, the back-termination series resistor will decouple

the EL2180, EL2280, and EL2480 from the cable and allo w

e xtensive capacitive driv e . However, other applications may

hav e high capacitiv e loads without a back-termination resistor .

In these applications, a small series resistor (usually between

5Ω and 50Ω) can be placed in series with the output to

eliminate most peaking. The gain resistor (R G) can then be

chosen to mak e up f or any gain lo ss which ma y be created by

this additional resistor at the output. In man y cases it is also

possible to simply increase th e value of the feedback resistor

(RF) to reduce the p eaking.

Current Limiting

The EL2180, EL2280, and EL2480 have no internal current-

limiting circuitry. If any output is shorted, it is possible to

e xceed the Absolu te Maxim um R atings for output current or

pow er dissipation, potentially resulting in the destruction of the

de vice.

Po wer Dissipation

With the high output driv e ca pability o f the EL2180, EL 2280,

and EL2480, it is possib le to exceed the 150°C Absolute

Maximum junction temper ature under certain very high load

current conditions . Gener ally spe aking, whe n RL f alls below

about 25Ω, it is important to calculate the maximum junction

temperature (TJMAX) for the application to determine if power-

supply v oltages, load condition s , or package type need to be

modified f or the EL2180, EL22 80, and EL248 0 to remain in

the saf e oper ating area. These par a meters are calculated as

f ollows [1]:

where:

TMAX = Maximum ambient temperature

θJA = Thermal resistance of the package

n = Number of amplifiers in the pack age

PDMAX = Maximum po w er d issipation of each ampli fier in

the packa ge

PDMAX f or each amplifier can be calculated as follows [2]:

where:

VS = Supply v oltag e

ISMAX = Maxi mum sup ply current of 1 amplifier

VOUTMAX = Maximum output voltage of the a pplication

RL = Load resistance

TJMAX TMAX ΘJA nPD

MAX

××()+=

PDMAX 2(VSISMAX)VS

( - VOUTMAX)VOUTMAX

----------------------------

×+××=

EL2180, EL2280, EL2480

Typical Application Circuits

INVERTING 200mA OUTPUT CURRENT DISTRIBUTION

AMPLIFIER

FAST-SETTLING PRECISION AMPLIFIER

DIFFERENTIAL LINE-DRIVER/RECEIVER

120

EL2180, EL2280, EL2480

EL2180/EL2280/EL2480 Macromodel

* EL2180 Macromodel

* Revision A, March 1995

* AC characteristics used: Rf = Rg = 750 ohms

* Connections: +input

* | -input

* | | +Vsupply

* | | | -Vsupply

* | | | | output

* | | | | |

.subckt EL2180/el 3 2 7 4 6

* Input Stage

e1 10 0 3 0 1.0

vis 10 9 0V

h2 9 12 vxx 1.0

r1 2 11 400

l1 11 12 25nH

iinp 3 0 1.5uA

iinm 2 0 3uA

r12 3 0 2Meg

* Slew Rate Limiting

h1 13 0 vis 600

r2 13 14 1K

d1 14 0 dclamp

d2 0 14 dclamp

* High Frequency Pole

e2 30 0 14 0 0.00166666666

l3 30 17 150nH

c5 17 0 0.8pF

r5 17 0 165

* Transimpedance Stage

g1 0 18 17 0 1.0

rol 18 0 450K

cdp 18 0 0.675pF

* Output Stage

q1 4 18 19 qp

q2 7 18 20 qn

q3 7 19 21 qn

q4 4 20 22 qp

r7 21 6 4

r8 22 6 4

ios1 7 19 1mA

ios2 20 4 1mA

* Supply Current

ips 7 4 0.2mA

* Error Ter ms

EL2180, EL2280, EL2480

All Intersil U.S. products are man ufactured, assembled and tested utilizing ISO9000 quality systems.

Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without

notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and

reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result

from its use. No license i s gr a nted b y imp lica tion or oth erw ise unde r any patent or pat en t rights of In t ersil or its sub sidi aries.

For information regarding Intersil Corporati on and its products, see www.intersil.com

ivos 0 23 0.2mA

vxx 23 0 0V

e4 24 0 3 0 1.0

e5 25 0 7 0 1.0

e6 26 0 4 0 -1.0

r9 24 23 316

r10 25 23 3.2K

r11 26 23 3.2K

* Models

.model qn npn(is=5e-15 bf=200 tf=0.01nS)

*.model qp pnp(is=5e-15 bf=200 tf=0.01nS)

.model dclamp d(is=1e- 30 ibv=0.266

+ bv=0.71v n=4)

.ends

EL2180/EL2280/EL2480 Macromodel

EL2180, EL2280, EL2480