EL2480CS-T13 - Elantec Semiconductor

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.

EL2180C/EL2280C/EL2480C-

General Description

The EL2180C/EL2280C/EL2480C are single/dual/quad current-feed-

back operational amplifiers that achieve 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 EL2480C and the EL2280C can output

55mA while swinging to ±4V on ±5V supplies. The EL2180C can out-

put 100mA with similar output swings. These attributes make the

EL2180C/EL2280C/EL2480C excellent choices for low power and/or

low voltage cable driver, HDSL, or RGB applications.

For applications where board space is extremely critical, the EL2180C

is available in the tiny 5-pin SOT23 package, with a footprint size 28%

of an 8-pin SO. The EL2480C is also available in a 24-pin LPP pack-

age. All are specified for operation over the full -40°C to +85°C

temperature range.

Single, dual, and triple versions are also available with the enable

function (EL2186C, EL2286C, and EL2386C).

Connection Diagrams

EL2180C

(8-Pin SO & 8-Pin PDIP)

IN-

IN+

VS-

VS+

OUT

EL2280C

(8-Pin SO & 8-Pin PDIP)

OUTA

INA-

INA+

VS-

VS+

OUTB

INB-

INB+

Features

•Single, dual, and quad topologies

•3mA supply current (per amplifier)

•250MHz -3dB bandwidth

•1200V/µs slew rate

•Tiny package package options

(SOT23, LPP)

•Low cost

•Single- and dual-supply operation

down to ±1.5V

•0.05%/0.05° diff. gain/diff. phase

into 150Ω

Applications

•Low power/battery applications

•HDSL amplifiers

•Video amplifiers

•Cable drivers

•RGB amplifiers

•Test equipment amplifiers

•Current to voltage converters

Ordering Information

Part No Package

Tape &

Reel Outline #

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 SOT23 7” MDP0038

EL2180CW-T13 5-Pin SOT23 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

EL2480CL 24-Pin LPP -MDP0046

EL2480CL-T7 24-Pin LPP 7” MDP0046

EL2480CL-T13 24-Pin LPP 13” MDP0046

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

July 19, 2001

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

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 (EL2180C) ±120mA

Output Current (EL2280C) ±60mA

Output Current (EL2480C) ±60mA

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

DC Electrical Characteristics

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 EL2280C, EL2480C only 0.5 mV

+IIN +Input Current 1.5 15 µA

d+IIN +IIN Matching EL2280C, EL2480C only 20 nA

-IIN -Input Current 16 40 µA

d-IIN -IIN Matching EL2280C, EL2480C only 2µA

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 EL2180C only 80 100 mA

EL2280C only, per amplifier 50 55 mA

EL2480C only, per amplifier 50 55 mA

ISSupply Current Per amplifier 3 6 mA

Important Note:

All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the

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

AC Electrical Characteristics

VS = ±5V, RF = RG = 750Ω for PDIP and SO packages, RF = RG = 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 = ±500 mV 1.5 ns

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Connection Diagrams (Continued)

tPD Propagation Delay VOUT = ±500 mV 1.5 ns

OS Overshoot VOUT = ±500 mV 3.0 %

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

dG Differential Gain AV = +2, RL = 150Ω [1] 0.05 %

dP Differential Phase AV = +2, RL = 150Ω [1] 0.05 °

dG Differential Gain AV = +1, RL = 500Ω [1] 0.01 %

dP Differential Phase AV = +1, RL = 500Ω [1] 0.01 °

CSChannel Separation EL2280C, EL2480C only, f = 5 MHz 85 dB

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

AC Electrical Characteristics

VS = ±5V, RF = RG = 750Ω for PDIP and SO packages, RF = RG = 560Ω for SOT23-5 package, RL = 150Ω, TA = 25°C unless otherwise specified

Parameter Description Conditions Min Typ Max Unit

EL2480C

(14-Pin SO & 14-Pin PDIP)

EL2480C

(24-Pin LPP - Top View)

Thermal Pad

INA+

VS+

INB+

IND+

VS-

INC+

INA-

OUTA

OUTD

IND-

INB-

OUTB

OUTC

INC-

EL2180C

(5-Pin SOT23)

OUT

GND

IN+

VS+

IN-

OUTA

INA-

INA+

VS+

OUTD

IND-

IND+

VS-

INB+

INB-

OUTB

INC+

INC-

OUTC

-+-+

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Test Circuit (Per Amplifier)

Simplified Schematic (Per Amplifier)

IN+

IN-

VIN

RGRF

750Ω750Ω

VS-

VS+

OUT

150Ω

VOUT

+5V

-5V

0.1µF

EL2180C or

½ EL2280C or

¼ EL2480C

*see note

* Note:

IN+

V+

V-

R7V2

Q14

Q10

R2V1R3R4R5

Q3Q4

Q11

Q15 Q16 Q17

R8R9R10

IN-

OUT

Q13

Q12

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Typical Performance Curves

Non-Inverting Frequency

Response (Gain)

(PDIP and SOIC Packages)

Non–Inverting Frequency

Response (Phase)

(PDIP and SOIC Packages)

Frequency Response

for Various RF and RG

(PDIP and SOIC Packages)

Inverting Frequency

Response (Gain)

(PDIP and SOIC Packages)

Inverting Frequency

Response (Phase)

(PDIP and SOIC Packages)

Frequency Response

for Various RL and CL

(PDIP and SOIC Packages)

Frequency Response for

Various CIN-

PSRR and CMRR

vs Frequency

Transimpedance (ROL) vs

Frequency

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Typical Performance Curves

Voltage and Current

Noise vs Frequency

2nd and 3rd Harmonic

Distortion vs Frequency

Output Voltage

Swing vs Frequency

Output Voltage Swing

vs Supply Voltage

-3 dB Bandwidth and Peaking

vs Supply Voltage for

Various Inverting Gains

-3 dB 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

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Typical Performance Curves

Input Bias Current

vs Die Temperature

Short-Circuit Current

vs Die Temperature

Transimpedance (ROL)

vs Die Temperature

-3 dB Bandwidth and Peaking

vs Die Temperature for

Various Non-Inverting Gains

-3 dB 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

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Typical Performance Curves

Differential Gain and

Phase vs DC Input

Voltage at 3.58 MHz

Differential Gain and

Phase vs DC Input

Voltage at 3.58 MHz

Settling Time vs

Settling Accuracy

Small-Signal Step Response Large-Signal Step Response

5-Lead Plastic SOT23

Maximum Power Dissipation

vs Ambient Temperature

8-Pin Plastic DIP

Maximum Power Dissipation

vs Ambient Temperature

8-Lead SO

Maximum Power Dissipation

vs Ambient Temperature

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Typical Performance Curves

14-Pin Plastic DIP

Maximum Power Dissipation

vs Ambient Temperature

14-Lead 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 Package)

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Applications Information

Product Description

The EL2180C/EL2280C/EL2480C are current-feedback

operational amplifiers that offer a wide -3dB bandwidth

of 250MHz and a low supply current of 3mA per ampli-

fier. All of these products also feature high output

current drive. The EL2180C can output 100mA, while

the EL2280C and the EL2480C can output 55mA per

amplifier. The EL2180C/EL2280C/EL2480C 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 cur-

rent-feedback topology, the EL2180C/EL2280C/

EL2480C do not have the normal gain-bandwidth prod-

uct 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 EL2180C/EL2280C/

EL2480C the ideal choice for many low-power/high-

bandwidth applications such as portable computing,

HDSL, and video processing.

For applications where board space is extremely critical,

the EL2180C is available in the tiny 5-pin SOT23 pack-

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

The EL2480C is available in the 24-pin LPP package,

offering board space savings and better power dissipa-

tion compared to the SO and PDIP packages. The

EL2180C/EL2280C/EL2480C are each also available in

industry-standard pinouts in PDIP and SO packages.

For single, dual, and triple applications with disable,

consider the EL2186C (8-pin single), EL2286C (14-pin

dual), and EL2386C (16-pin triple). If lower power is

required, refer to the EL2170C/EL2176C family which

provides singles, duals, and quads with 70MHz of band-

width 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 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 4.7µF tantalum capac-

itor in parallel with a 0.1µF 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 construction 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.

Capacitance at the Inverting Input

Any manufacturer's high-speed voltage- or current-feed-

back 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 capaci-

tance (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 feedback and gain

resistors further exacerbates the problem by further low-

ering the pole frequency.

The experienced user with a large amount of PC board

layout experience may find in rare cases that the

EL2180C/EL2280C/EL2480C have less bandwidth than

expected.

The reduction of feedback resistor values (or the addi-

tion 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 Frequency

Response for Various CIN-.

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Feedback Resistor Values

The EL2180C/EL2280C/EL2480C have been designed

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

PDIP and SO packages and RF = 560Ω in 5-pin SOT23

package. These values of feedback resistors give

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 5-pin SOT23

package is characterized with a smaller value of feed-

back 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

EL2180C/EL2280C/EL2480C are current-feedback

amplifiers, it is also possible to change the value of RF to

get more bandwidth. As seen in the curve of Frequency

Response For Various RF and RG, bandwidth and peak-

ing can be easily modified by varying the value of the

feedback resistor.

Because the EL2180C/EL2280C/EL2480C are current-

feedback amplifiers, their gain-bandwidth product is not

a constant for different closed-loop gains. This feature

actually allows the EL2180C/EL2280C/EL2480C to

maintain about the same -3dB 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 RF below the specified 560Ω and 750Ω and

still retain stability, resulting in only a slight loss of

bandwidth with increased closed-loop gain.

Supply Voltage Range and Single-Supply

Operation

The EL2180C/EL2280C/EL2480C 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 EL2180C/EL2280C/EL2480C will oper-

ate on dual supplies ranging from ±1.5V to ±6V. With a

single-supply, the EL2180C/EL2280C/EL2480C will

operate from +3V to +12V.

As supply voltages continue to decrease, it becomes nec-

essary to provide input and output voltage ranges that

can get as close as possible to the supply voltages. The

EL2180C/EL2280C/EL2480C have an input voltage

range that extends to within 1V of either supply. So, for

example, on a single +5V supply, the EL2180C/

EL2280C/EL2480C have an input range which spans

from 1V to 4V. The output range of the

EL2180C/EL2280C/EL2480C is also quite large,

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

ply, 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 exter-

nal pull-down resistor to ground. On a single +5V

supply, 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 fre-

quency response as DC levels 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 EL2180C/EL2280C/EL2480C,

good Differential Gain could only be achieved by run-

ning high idle currents through the output transistors (to

reduce variations in output impedance). These currents

were typically comparable to the entire 3mA supply cur-

rent of each EL2180C/EL2280C/EL2480C amplifier!

Special circuitry has been incorporated in the

EL2180C/EL2280C/EL2480C 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

150Ω at a gain of +2.

Video Performance has also been measured with a 500Ω

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

EL2180C/EL2280C/EL2480C have dG and dP specifi-

cations of 0.01% and 0.01° respectively while driving

500Ω at AV = +1.

Output Drive Capability

In spite of its low 3mA of supply current, the EL2180C

is capable of providing a minimum of ±80mA of output

current. Similarly, each amplifier of the EL2280C and

the EL2480C is capable of providing a minimum of

±50mA. These output drive levels are unprecedented in

amplifiers running at these supply currents. With a min-

imum ±80mA of output drive, the EL2180C is capable

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

choice for driving isolation transformers in telecommu-

nications applications. Similarly, the ±50mA minimum

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

output drive of each EL2280C and EL2480C amplifier

allows swings of ±2.5V into 50Ω 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 resis-

tor will decouple the EL2180C/EL2280C/EL2480C

from the cable and allow extensive capacitive drive.

However, other applications may have high capacitive

loads without a back-termination resistor. In these appli-

cations, a small series resistor (usually between 5Ω and

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

most peaking. The gain resistor (RG) can then be chosen

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 feed-

back resistor (RF) to reduce the peaking.

Current Limiting

The EL2180C/EL2280C/EL2480C have no internal cur-

rent-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

EL2180C/EL2280C/EL2480C, it is possible to exceed

the 150°C Absolute Maximum junction temperature

under certain very high load current conditions. Gener-

ally speaking, when RL falls below about 25Ω, it is

important to calculate the maximum junction tempera-

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

supply voltages, load conditions, or package type need

to be modified for the EL2180C/EL2280C/EL2480C to

remain in the safe operating area. These parameters are

calculated as follows:

where:

TMAX = Maximum Ambient Temperature

θJA = Thermal Resistance of the Package

n = Number of Amplifiers in the Package

PDMAX = Maximum Power Dissipation of Each

Amplifier in the Package

PDMAX for each amplifier can be calculated as follows:

where:

VS = Supply Voltage

ISMAX = Maximum Supply Current of 1 Amplifier

VOUTMAX = Maximum Output Voltage of the

Application

RL = Load Resistance

TJMAX TMAX ΘJA nPDMAX

××()+=

PDMAX 2(VSISMAX)VS

(VOUTMAX)VOUTMAX

----------------------------×–+××=

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Typical Application Circuits

IN+

IN-

VIN

750Ω

VS-

VS+

OUT

VOUT

+5V

-5V

0.1µF

5Ω

+5V

-5V

0.1µF

IN+

IN-

VS-

VS+

OUT

5Ω

750Ω750Ω

EL2180C

Figure 1. Inverting 200mA Output Current Distribution Amplifier

Figure 2. Fast-Settling Precision Amplifier

IN+

IN-

VIN

VS-

VS+

OUT

VOUT

+5V

-5V

0.1µF

+5V

-5V

0.1µF

IN+

IN-

VS-

VS+

OUT

750Ω750Ω

750Ω

½ EL2280C or

¼ EL2480C

* Note:

*see note

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

Typical Application Circuits (Continued)

Figure 3. Differential Line Driver/Receiver

IN+

IN-

VIN

750Ω

VS-

VS+

OUT

VOUT+

+5V

-5V

0.1µF

120Ω

+5V

-5V

0.1µF

IN+

IN-

VS-

VS+

OUT

120Ω

750Ω750Ω

*see note

*see note VOUT-

*see note

+5V

-5V

0.1µF

IN+

IN-

VS-

VS+

OUT

*see note

+5V

-5V

0.1µF

IN+

IN-

VS-

VS+

OUT VOUT

*see note

750Ω750Ω

1kΩ

0.1µF

240Ω

RECEIVERTRANSMITTER

EL2180 or

½ EL2280C or

¼ EL2480C

* Note:

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

EL2180C/EL2280C/EL2480C 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 Terms

ivos 0 23 0.2mA

vxx 23 0 0V

e4 24 0 3 0 1.0

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-Preliminary

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

EL2180C/EL2280C/EL2480C-Preliminary

250MHz / 3mA Current Mode Feedback Amplifiers

EL2180C/EL2280C/EL2480C-

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 cir-

cuitry 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 - 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 intended to sup-

port 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 con-

templating 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. Elan-

tec, Inc.’s warranty is limited to replacement of defective

components and does not cover injury to persons or property or

other consequential damages.

July 19, 2001

Printed in U.S.A.

Elantec Semiconductor, Inc.

675 Trade Zone Blvd.

Milpitas, CA 95035

Telephone: (408) 945-1323

(888) ELANTEC

Fax: (408) 945-9305

European Office: +44-118-977-6020

Japan Technical Center: +81-45-682-5820