intersil EL5191, EL5191A DATA SHEET

Data Sheet August 3, 2005

EL5191, EL5191A

FN7180.2

1GHz Current Feedback Amplifier with Enable

The EL5191 and EL5191A amplifiers are of the current feedback variety and exhibit a very high bandwidth of 1GHz. This makes these amplifiers ideal for today’s high speed video and monitor applications, as well as a number of RF and IF frequency designs.

With a supply current of just 9mA and the ability to run from a single supply voltage from 5V to 10V, these amplifiers offer very high performance for little power consumption.

The EL5191A also incorporates an enable and disable function to reduce the supply current to 100µA typical per amplifier. Allowing the CE

pin to float or applying a low logic

level will enable the amplifier. The EL5191 is offered in the 5-pin SOT-23 package and the

EL5191A is available in the 6-pin SOT-23 as well as the industry-standard 8-pin SO packages. Both operate over the industrial temperature range of -40°C to +85°C.

Ordering Information

TAPE &

PART NUMBER PACKAGE

EL5191CS 8-Pin SO - MDP0027 EL5191CSZ

(See Note) EL5191CSZ-T7

(See Note) EL5191CSZ-T13

(See Note)

8-Pin SO (Pb-free)

8-Pin SO

(Pb-free) EL5191CW-T7 5-Pin SOT-23 7” MDP0038 EL5191CWZ-T7

(See Note)

5-Pin SOT-23

(Pb-free) EL5191ACW-T7 6-Pin SOT-23 7” (3K pcs) MDP0038 EL5191ACW-T7A 6-Pin SOT-23 7” (250 pcs) MDP0038 EL5191ACWZ-T7

(See Note) EL5191ACWZ-T7A

(See Note)

6-Pin SOT-23

(Pb-free)

6-Pin SOT-23

(Pb-free) EL5191ACS 8-Pin SO - MDP0027 EL5191ACS-T7 8-Pin SO 7” MDP0027 EL5191ACS-T13 8-Pin SO 13” MDP0027 EL5191ACSZ

(See Note) EL5191ACSZ-T7

(See Note) EL5191ACSZ-T13

(See Note)

NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

8-Pin SO

(Pb-free)

8-Pin SO

(Pb-free)

8-Pin SO

(Pb-free)

REEL PKG. DWG. #

- MDP0027

7” MDP0027

13” MDP0027

7” MDP0038

7” (3K pcs) MDP0038

7” (250 pcs) MDP0038

- MDP0027

7” MDP0027

13” MDP0027

Features

• 1GHz -3dB bandwidth

• 9mA supply current

• Single and dual supply operation, from 5V to 10V supply span

• Fast enable/disable (EL5191A only)

• Available in SOT-23 packages

• High speed, 600MHz product available (EL5192, EL5292, and EL5392)

• Lower power, 300MHz product available (EL5193, EL5293, EL5393)

• Pb-Free plus anneal available (RoHS compliant)

Applications

• Video amplifiers

• Cable drivers

• RGB amplifiers

• Test equipment

• Instrumentation

• Current to voltage converters

Pinouts

EL5191A

(8-PIN SO)

TOP VIEW

(6-PIN SOT-23)

TOP VIEW

OUT

VS-

IN+

EL5191A

IN-

IN+

5 CE

VS+

IN-

(5-PIN SOT-23)

OUT

IN+

OUT

EL5191

TOP VIEW

IN-

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

1-888-INTERSIL or 1-888-468-3774

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

EL5191, EL5191A

Absolute Maximum Ratings (T

Supply Voltage between V

Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 50mA

Operating Junction Temperature. . . . . . . . . . . . . . . . . . . . . . .125°C

+ and VS-. . . . . . . . . . . . . . . . . . . . .11V

= 25°C)

Pin Voltages. . . . . . . . . . . . . . . . . . . . . . . . . V

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

- -0.5V to VS+ +0.5V

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

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

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 conditions 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 purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = T

Electrical Specifications V

+ = +5V, VS- = -5V, RF = 392Ω for AV = 1, RF = 250Ω for AV = 2, RL = 150Ω, TA = 25°C unless otherwise

specified

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

AC PERFORMANCE

BW -3dB Bandwidth A

= +1 1000 MHz

= +2 600 MHz

BW1 0.1dB Bandwidth 30 MHz SR Slew Rate V t

- IN- Input Current Noise 25 pA/√Hz

0.1% Settling Time V Input Voltage Noise 3.8 nV/√Hz

= -2.5V to +2.5V, AV = +2 2400 2800 V/µs

= -2.5V to +2.5V, AV = -1 7 ns

OUT

iN+ IN+ Input Current Noise 55 pA/√Hz dG Differential Gain Error (Note 1) A dP Differential Phase Error (Note 1) A

= +2 0.035 %

= +2 0.04 °

DC PERFORMANCE

CVOS

Offset Voltage -15 1 15 mV Input Offset Voltage Temperature

Coefficient

Measured from T

MIN

to T

MAX

5µV/°C

Transimpedance 150 300 kΩ

INPUT CHARACTERISTICS

CMIR Common Mode Input Range ±3 ±3.3 V CMRR Common Mode Rejection Ratio 42 50 dB

-ICMR - Input Current Common Mode Rejection -6 6 µA/V +I

-I

+ Input Current -120 40 120 µA

- Input Current -60 5 60 µA Input Resistance 27 kΩ Input Capacitance 0.5 pF

OUTPUT CHARACTERISTICS

OUT

Output Voltage Swing RL = 150Ω to GND ±3.4 ±3.7 V

= 1kΩ to GND ±3.8 ±4.0 V

Output Current RL = 10Ω to GND 95 120 mA

SUPPLY

SON

SOFF

Supply Current - Enabled No load, V Supply Current - Disabled No load, V

= 0V 8 9 11 mA

= 0V 100 150 µA

EL5191, EL5191A

Electrical Specifications V

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

PSRR Power Supply Rejection Ratio DC, VS = ±4.75V to ±5.25V 55 75 dB

-IPSR - Input Current Power Supply Rejection DC, V

ENABLE (EL5191A ONLY)

DIS

IHCE

ILCE

IHCE

ILCE

NOTE:

1. Standard NTSC test, AC signal amplitude = 286mV

Enable Time 40 ns Disable Time 600 ns CE Pin Input High Current CE = VS+0.86µA CE Pin Input Low Current CE = VS-0-0.1µA CE Input High Voltage for Power-down VS+ - 1 V CE Input Low Voltage for Power-down VS+ - 3 V

+ = +5V, VS- = -5V, RF = 392Ω for AV = 1, RF = 250Ω for AV = 2, RL = 150Ω, TA = 25°C unless otherwise

specified

. (Continued)

P-P

, f = 3.58MHz

= ±4.75V to ±5.25V -2 2 µA/V

Typical Performance Curves

EL5191, EL5191A

Non-Inverting Frequency Response (Gain) SOT-23 Package

-2

-6

-10 RF = 390Ω

Normalized Magnitude (dB)

RL = 150Ω

-14

1M 10M 100M 1G

Inverting Frequency Response (Gain) SOT-23 Package

-2

-6

-10

Normalized Magnitude (dB)

RF = 250Ω RL = 150Ω

-14

1M 10M 100M 1G

AV = 5

AV = 10

Frequency (Hz)

AV = 1

AV=-2

AV=-5

AV = 2

AV=-1

Non-Inverting Frequency Response (Phase)

AV = 1

AV = 5

AV = -2

AV = -5

AV = 1

AV = 10

-90

-180

Phase (°)

-270

RF = 390Ω RL = 150Ω

-360

-360 1M 10M 100M 1G

1M 10M 100M 1G

Frequency (Hz)

Inverting Frequency Response (Phase)

-90

-180

Phase (°)

-270

RF = 250Ω RL = 150Ω

-360 1M 10M 100M 1G

Frequency (Hz)

AV = -1

AV = 2

Frequency Response for Var ious CIN-

-2

-6

AV = 2

Normalized Magnitude (dB)

RF = 250Ω RL = 150Ω

-10 1M 10M 1G

2pF added

1pF added

0pF added

100M

Frequency (Hz)

Frequency Response for Various R

-2

-6

-10

Normalized Magnitude (dB)

AV = 2

= 250Ω

-14 1M 10M 100M 1G

RL = 100Ω

RL = 500Ω

Frequency (Hz)

RL = 150Ω

Typical Performance Curves (Continued)

EL5191, EL5191A

Frequency Response for Various C

-2

AV = 2

Normalized Magnitude (dB)

RF = 250Ω RL=150Ω

-6 1M 10M 100M 1G

Group Delay vs Frequency

3.5

2.5

1.5

Group Delay (ns)

0.5

1M 10M 1G

6pF added

4pF added

0pF added

Frequency (Hz)

AV = 2

RF = 250Ω

100M

Frequency (Hz)

AV = 1

RF = 390Ω

Frequency Response for Various R

-2

-6

-10

AV = 2

Normalized Magnitude (dB)

RG = R

RL = 150Ω

-14 1M 10M 100M 1G

Frequency Response for Various Common-Mode Input Voltages

-2

-6

-10

AV = 2

Normalized Magnitude (dB)

RF = 250Ω RL = 150Ω

-14 1M 10M 1G

150Ω

375Ω

Frequency (Hz)

= 3V V

= -3V

100M

Frequency (Hz)

500Ω

250Ω

= 0V

Transimpedance (ROL) vs Frequency

10M

100k

10k

Magnitude (Ω)

100

10k 100k 1M 10M 100M 1G

Frequency (Hz)

Phase

Gain

-90

-180

-270

-360

Phase (°)

PSRR and CMRR vs Frequency

-20

-40

PSRR/CMRR (dB)

-60

-80

10k

100k 1M 10M 1G100M

PSRR+

PSRR-

CMRR

Frequency (Hz)

Typical Performance Curves (Continued)

EL5191, EL5191A

-3dB Bandwidth vs Supply Voltage for NonInverting Gains

1200

RF = 390Ω

= 150Ω

1000

800

600

400

-3dB Bandwidth (MHz) 200

56 10

Peaking vs Supply Voltage for Non-Inverting Gains

3.5 3

2.5 2

1.5

Peaking (dB)

0.5 0

56 10879

AV = 1

AV = 2

AV = 10

RF = 390Ω RL=150Ω

AV = 5

Total Supply Voltage (V)

AV = 1

AV = 2

AV = 10

Total Supply Voltage (V)

-3dB Bandwidth vs Supply Voltage for Inverting Gains

600

500

400

300

200

-3dB Bandwidth (MHz) 100

Peaking (dB)

AV = -1

AV = -5

RF = 250Ω RL = 150Ω

56 10

Total Supply Voltage (V)

Peaking vs Supply Voltage for Inverting Gains

RF = 250Ω RL = 150Ω

56 10879

Total Supply Voltage (V)

AV = -2

AV = -1

AV = -2

AV = -5

Non-Inverting Frequency Response (Gain) SO8 Package

-2

-6

-10

Normalized Magnitude (dB)

RF = 392Ω RL = 150Ω

-14 1M 10M 1G

AV = 1 AV = 2

AV = 5

AV = 10

100M 1.6G

Frequency (Hz)

Non-Inverting Frequency Response (Phase) SO8 Package

-90

-180

Phase (°)

-270 RF =

RF = 392Ω

392Ω

RL = 150Ω

-360

1M 10M 1G

AV = 1 AV = 2

AV = 5

AV = 10

100M

Frequency (Hz)

Typical Performance Curves (Continued)

EL5191, EL5191A

Inverting Frequency Response (Gain) SO8 Package

-2

-6

-10

Normalized Magnitude (dB)

RF = 250Ω RL = 150Ω

-14 1M 10M

-3dB Bandwidth vs Temperature for Non-Inverting Gains

2000

1500

1000

500

-3dB Bandwidth (MHz)

-40 10 60 160

AV=2

Ambient Temperature (°C)

AV = -1 AV = -2

AV = -5

Frequency (Hz)

AV=1

AV=5 AV=10

100M 1G

RF = 250Ω RL = 150Ω

110

Inverting Frequency Response (Phase) SO8 Package

-90

-180

Phase (°)

-270 RF = 250Ω

RL = 150Ω

-360

1M 10M

-3dB Bandwidth vs Temperature for Inverting Gains

700

600

500

400

300

200

-3dB Bandwidth (MHz) 100

RF=250Ω RL=150Ω

-40 10 60 160

AV = -1 AV = -2

AV = -5

100M 1G

Frequency (Hz)

AV = -1

AV = -2

AV = -5

Ambient Temperature (°C)

110

Peaking vs Temperature

2.5

1.5

Peaking (dB)

0.5

-40 10 60 160

AV = 1

AV = -1

Ambient Temperature (°C)

RL = 150Ω

AV = -2

110

Voltage and Current Noise vs Frequency

iN+

iN-

1k 10k 100k 10M1M

Frequency (Hz)

Voltage Noise (nV/√Hz)

Current Noise (pA/√Hz)

100

Typical Performance Curves (Continued)

EL5191, EL5191A

Closed Loop Output Impedance vs Frequency

100

0.1

Output Impedance (Ω)

0.01

0.001 100

1k 10M 1G100k

2nd and 3rd Harmonic Distortion vs Frequency

-10 AV = +2

-20

OUT

RL = 100Ω

-30

-40

-50

-60

-70

-80

Harmonic Distortion (dBc)

-90

-100 1

= 2V

P-P

Frequency (Hz)

2nd Order Distortion

3rd Order Distortion

10 100 200

Frequency (MHz)

Supply Current vs Supply Voltage

Supply Current (mA)

Two-Tone 3rd Order Input Referred Intermodulation Intercept (IIP3)

30 25 20 15 10

5 0

-5

Input Power Intercept (dBm)

AV = +2

-10 RL = 100Ω

-15

Supply Voltage (V)

Frequency (MHz)

1221086410k 100M1M

100 200

Differential Gain/Phase vs DC Input Voltage at 3.58MHz

0.03 AV = 2 RF = RG = 250Ω RL = 150Ω

0.01

-0.01

dG (%) or dP (°)

-0.03

-0.05

-1 -0.5 0 0.5 1 DC Input Voltage

Differential Gain/Phase vs DC Input Voltage at 3.58MHz

0.03 AV = 1 RF = 375Ω

0.02 RL = 500Ω

0.01

-0.01

dG (%) or dP (°)

-0.02

-0.03

-0.04

-1 -0.5 0 0.5 1 DC Input Voltage

Typical Performance Curves (Continued)

EL5191, EL5191A

)

Output Voltage Swing (V

200mV/div

Output Voltage Swing vs Frequency THD < 1%

RL = 500Ω

RL = 150Ω

AV = 2 AV = 2

Small Signal Step Response Large Signal Step Response

10 100 200

Frequency (MHz)

VS = ±5V RL = 150Ω

= 2

= RG = 250Ω

Output Voltage Swing vs Frequency THD < 0.1%

RL = 500Ω

RL = 150Ω

)

Output Voltage Swing (V

1V/div

Frequency (MHz)

10 100

VS = ±5V R

= 150Ω

AV = 2

= RG = 250Ω

10ns/div

Settling Time vs Settling Accuracy

Settling Time (ns)

0.01 0.1 1 Settling Accuracy (%)

AV = 2 RF = RG = 250Ω RL= 150Ω V

= 5V

STEP

P-P

output

10ns/div

Transimpedance (ROI) Vs Temper ature

375

350

325

300

275

RoI (kΩ)

250

225

200

-40 10 60 110 160 Die Temperature (°C)

Typical Performance Curves (Continued)

EL5191, EL5191A

PSRR and CMRR vs Temperature

PSRR/CMRR (dB)

-40 10 60 110 160 Die Temperature (°C)

Offset Voltage vs Temperature

(mV)

-1

-40 10 60 110 160 Die Temperature (°C)

PSRR

CMRR

ICMR and IPSR vs Temperature

2.5

1.5

0.5

ICMR/IPSR (µA/V)

-0.5

-1

-40 10 60 110 160

Input Current vs Temperature 140 120 100

80 60 40

Input Current (µA)

-20

-40 10 60 110 160

ICMR+

IPSR

ICMR-

Die Temperature (°C)

IB+

IB-

Temperature (°C)

Positive Input Resistance vs Temperature

(kΩ)

-40 10 60 110 160 Temperature (°C)

Supply Current vs Temperature

Supply Current (mA)

-40 10 60 110 160 Temperature (°C)

Typical Performance Curves (Continued)

EL5191, EL5191A

Positive Output Swing vs Temperature for Various Loads

4.2

4.1

3.9

(V)

3.8

OUT

3.7

3.6

3.5

-40 10 60 110 160

Output Current vs Temperature

140

135

130

(mA)

125

OUT

120

115

-40 10 60 110 160

1kΩ

150Ω

Temperature (°C)

Sink

Source

Die Temperature (°C)

Negative Output Swing vs Temperature for Various Loads

-3.5

-3.6

-3.7

-3.8

(V)

-3.9

OUT

-4

-4.1

-4.2

-40 10 60 110 160

Slew Rate vs Temperature

5000

4500

4000

Slew Rate (V/µS)

3500

3000

-40 10 60 110 160

150Ω

1kΩ

Temperature (°C)

AV = 2 RF = RG = 250Ω R

Die Temperature (°C)

= 150Ω

Enable Response

500mV/div

5V/div

20ns/div

Typical Performance Curves (Continued)

Disable Response

500mV/div

5V/div

400ns/div

EL5191, EL5191A

JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD

1.4

1.2

909mW

0.8

0.6

0.4

0.2

POWER DISSIPATION (W)

0 25 50 75 100 150

AMBIENT TEMPERATURE (°C)

JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD

0.9

0.8

0.7

625mW

0.6

0.5

0.4

0.3

0.2

POWER DISSIPATION (W)

0.1

0 25 50 75 100 150

AMBIENT TEMPERATURE (°C)

SO8

θJA=110°C/W

SO8

θJA=160°C/W

JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD

0.5

0.45

0.4

435mW

0.35

0.3

0.25

0.2

0.15

0.1

POWER DISSIPATION (W)

0.05

12585

0 255075100 150

AMBIENT TEMPERATURE (°C)

JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD

0.45 391mW

0.4

0.35

0.3

0.25

0.2

0.15

0.1

POWER DISSIPATION (W)

0.05

0 255075100 150

AMBIENT TEMPERATURE (°C)

SOT23-5/6

θJA=230°C/W

125

EL5191, EL5191A

Pin Descriptions

8-PIN SO 5-PIN SOT-23 6-PIN SOT-23 PIN NAME FUNCTION EQUIVALENT CIRCUIT

1, 5 NC Not connected

2 4 4 IN- Inverting input

Circuit 1 3 3 3 IN+ Non-inverting input (See circuit 1) 422V 6 1 1 OUT Output

- Negative supply

VS+

IN-IN+

VS-

VS+

OUT

756V 85CE

+ Positive supply

Chip enable

Circuit 2

Circuit 3

VS+

VS-

EL5191, EL5191A

Applications Information

Product Description

The EL5191 is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 1GHz and a low supply current of 9mA per amplifier. The EL5191 works with supply voltages ranging from a single 5V to 10V and they are also capable of swinging to within 1V of either supply on the output. Because of their current-feedback topology, the EL5191 does not have the normal gain-bandwidth product associated with voltage-feedback operational amplifiers. Instead, its -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 EL5191 the ideal choice for many low-power/highbandwidth applications such as portable, handheld, or battery-powered equipment.

For varying bandwidth needs, consider the EL5192 with 600MHz on a 6mA supply current or the EL5193 with 300MHz on a 4mA supply current. Versions include single, dual, and triple amp packages with 5-pin SOT-23, 16-pin QSOP, and 8-pin or 16-pin SO outlines.

Power Supply Bypassing and Printed Circuit Board Layout

As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Low impedance ground plane construction is essential. Surface mount components are recommended, but if leaded components are used, 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 0.01µF 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) Even when ground plane construction is used, 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 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 additional peaking and overshoot.

Disable/Power-Down

The EL5191A amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 150µA. The EL5191A is disabled when its CE supply. Similarly, the amplifier is enabled by floating or pulling its CE ±5V supply, this means that an EL5191A amplifier will be

pin is pulled up to within 1V of the positive

pin to at least 3V below the positive supply. For

enabled when CE above 4V. Although the logic levels are not standard TTL, this choice of logic voltages allows the EL5191A to be enabled by tying CE applications. The CE

is 2V or less, and disabled when CE is

to ground, even in 5V single supply

pin can be driven from CMOS outputs.

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 feedback and gain resistors exacerbates the problem by further lowering the pole frequency (increasing the possibility of oscillation.)

The EL5191 has been optimized with a 250Ω feedback resistor. With the high bandwidth of these amplifiers, these resistor values might cause stability problems when combined with parasitic capacitance, thus ground plane is not recommended around the inverting input pin of the amplifier.

Feedback Resistor Values

The EL5191 has been designed and specified at a gain of +2 with R gives 600MHz of -3dB bandwidth at A peaking. With A bandwidth with 0.6dB of peaking. Since the EL5191 is a current-feedback amplifier, it is also possible to change the value of R Frequency Response for Various R peaking can be easily modified by varying the value of the feedback resistor.

Because the EL5191 is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closedloop gains. This feature actually allows the EL5191 to maintain about the same -3dB bandwidth. As 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 resulting in only a slight loss of bandwidth with increased closed-loop gain.

approximately 250Ω. This value of feedback resistor

= -2, that same RF gives 450MHz of

to get more bandwidth. As seen in the curve of

below the specified 250Ω and still retain stability,

= 2 with about 2dB of

and RG, bandwidth and

Supply Voltage Range and Single-Supply Operation

The EL5191 has been designed to operate with supply voltages having a span of greater than 5V and less than 10V. In practical terms, this means that the EL5191 will operate on dual supplies ranging from ±2.5V to ±5V. With single-supply, the EL5191 will operate from 5V to 10V.

EL5191, EL5191A

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 EL5191 has an input range which extends to within 2V of either supply. So, for example, on ±5V supplies, the EL5191 has an input range which spans ±3V. The output range of the EL5191 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 larger because of the increased negative swing due to the external pull-down resistor to ground.

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 150Ω, because of the change in output current with DC level. Previously, 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 comparable to the entire 9mA supply current of each EL5191 amplifier. Special circuitry has been incorporated in the EL5191 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.035% and 0.04°, 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 EL5191 has dG and dP specifications of 0.02% and 0.02°, respectively.

Output Drive Capability

In spite of its low 9mA of supply current, the EL5191 is capable of providing a minimum of ±95mA of output current. With a minimum of ±95mA of output drive, the EL5191 is capable of driving 50Ω loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications.

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 EL5191 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 5Ω and 50Ω) can be placed in series with the output to eliminate most peaking. The gain resistor (R 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

) to reduce the peaking.

) can then be chosen to

Current Limiting

The EL5191 has no internal current-limiting circuitry. If the output is shorted, it is possible to exceed the Absolute Maximum Rating for output current or power dissipation, potentially resulting in the destruction of the device.

Power Dissipation

With the high output drive capability of the EL5191, it is possible to exceed the 125°C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking when R important to calculate the maximum junction temperature (T

) for the application to determine if power supply

JMAX

voltages, load conditions, or package type need to be modified for the EL5191 to remain in the safe operating area. These parameters are calculated as follows:

JMAXTMAXθJA

where:

= Maximum ambient temperature

MAX

θJA = Thermal resistance of the package

n = Number of amplifiers in the package PD

= Maximum power dissipation of each amplifier in

MAX

the package

for each amplifier can be calculated as follows:

MAX

2( VSI

SMAX

where:

= Supply voltage

= Maximum supply current of 1A

SMAX

OUTMAX

= Maximum output voltage (required)

RL = Load resistance

falls below about 25Ω, it is

nPD

××()+=

MAX

) VS( - V

OUTMAX

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

)

×+××=

OUTMAX

Typical Application Circuits

EL5191, EL5191A

0.1µF

VS+

OUT

VS-

0.1µF

250Ω 5Ω

0.1µF

OUT

VS-

0.1µF

OUT

5Ω

IN+

IN-

IN+

IN-

250Ω 250Ω

+5V

-5V

+5V

-5V

INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER

250Ω 250Ω

VS+

VS-

0.1µF

OUT

0.1µF

250Ω

+5V

IN+

IN-

-5V

VS+

VS-

0.1µF

OUT

0.1µF

250Ω

+5V

IN+

IN-

-5V

FAST-SETTLING PRECISION AMPLIFIER

OUT

Typical Application Circuits (Continued)

EL5191, EL5191A

+5V

IN+

IN-

-5V 250Ω 120Ω

+5V

IN+

IN-

-5V

250Ω 250Ω

VS+

VS-

VS+

VS-

0.1µF

OUT

120Ω

0.1µF

+5V

IN+

IN-

0.1µF

OUT

240Ω

0.1µF

OUT

1kΩ

250Ω

IN+

IN-

250Ω 250Ω

-5V

+5V

-5V

ReceiverTransmitter

250Ω

VS+

VS-

VS+

VS-

0.1µF

OUT

DIFFERENTIAL LINE DRIVER/RECEIVER

All Intersil U.S. products are manufactured, 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 she ets are current before placin g orders. Information furn ished 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 is granted by implication or othe rwise under any patent or patent rights of Intersil or its subsidiaries.

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

intersil EL5191, EL5191A DATA SHEET

Specifications and Main Features

Frequently Asked Questions

User Manual