Datasheet

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AD8014

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700 www.analog.com

Fax: © Analog Devices, Inc.,

400 MHz Low Power

High Performance Amplifier

FUNCTIONAL BLOCK DIAGRAMS

FEATURES

Low Cost

Low Power: 1.15 mA Max for 5 V Supply

High Speed

400 MHz, –3 dB Bandwidth (G = +1)

4000 V/␮s Slew Rate

60 ns Overload Recovery

Fast Settling Time of 24 ns

Drive Video Signals on 50 ⍀ Lines

Very Low Noise

3.5 nV/√Hz and 5 pA/√Hz

5 nV/√Hz Total Input Referred Noise @ G = +3 w/500 ⍀

Feedback Resistor

Operates on +4.5 V to +12 V Supplies

Low Distortion –70 dB THD @ 5 MHz

Low, Temperature-Stable DC Offset

Available in SOIC-8 and SOT-23-5

APPLICATIONS

Photo-Diode Preamp

Professional and Portable Cameras

Hand Sets

DVD/CD

Handheld Instruments

A-to-D Driver

Any Power-Sensitive High Speed System

PRODUCT DESCRIPTION

The AD8014 is a revolutionary current feedback operational

amplifier that attains new levels of combined bandwidth, power,

output drive and distortion. Analog Devices, Inc. uses a propri-

etary circuit architecture to enable the highest performance

amplifier at the lowest power. Not only is it technically superior,

but is low priced, for use in consumer electronics. This general

purpose amplifier is ideal for a wide variety of applications

including battery operated equipment.

The AD8014 is a very high speed amplifier with 400 MHz,

–3 dB bandwidth, 4000 V/µs slew rate, and 24 ns settling time.

The AD8014 is a very stable and easy to use amplifier with fast

overload recovery. The AD8014 has extremely low voltage and

current noise, as well as low distortion, making it ideal for use

in wide-band signal processing applications.

For a current feedback amplifier, the AD8014 has extremely

low offset voltage and input bias specifications as well as low

drift. The input bias current into either input is less than 15 µA

at +25°C with a typical drift of less than 50 nA/°C over the

industrial temperature range. The offset voltage is 5 mV max

with a typical drift less than 10 µV/°C.

For a low power amplifier, the AD8014 has very good drive

capability with the ability to drive 2 V p-p video signals on

75 Ω or 50 Ω series terminated lines and still maintain more

than 135 MHz, 3 dB bandwidth.

SOIC-8 (R)

AD8014

–IN

–V

+IN

NC = NO CONNECT

OUT

SOT-23-5 (RT)

OUT

AD8014

–V

+IN

–IN

Rev. C

781/461-3113

2010

Summary of content (11 pages)

PAGE 1
a FEATURES Low Cost Low Power: 1.15 mA Max for 5 V Supply High Speed 400 MHz, –3 dB Bandwidth (G = +1) 4000 V/␮s Slew Rate 60 ns Overload Recovery Fast Settling Time of 24 ns Drive Video Signals on 50 ⍀ Lines Very Low Noise 3.5 nV/√Hz and 5 pA/√Hz 5 nV/√Hz Total Input Referred Noise @ G = +3 w/500 ⍀ Feedback Resistor Operates on +4.
PAGE 2
AD8014–SPECIFICATIONS (@ T = +25ⴗC, V = ⴞ5 V, R = 150 ⍀, R = 1 k⍀, Gain = +2, unless otherwise noted) A Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth Small Signal –3 dB Bandwidth Large Signal 0.1 dB Small Signal Bandwidth 0.1 dB Large Signal Bandwidth Slew Rate, 25% to 75%, VO = 4 V Step Settling Time to 0.
PAGE 3
AD8014 SPECIFICATIONS (@ T = +25ⴗC, V = +5 V, R = 150 ⍀, R = 1 k⍀, Gain = +2, unless otherwise noted) A Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth Small Signal –3 dB Bandwidth Large Signal 0.1 dB Small Signal Bandwidth 0.1 dB Large Signal Bandwidth Slew Rate, 25% to 75%, VO = 2 V Step Settling Time to 0.
PAGE 4
AD8014 ABSOLUTE MAXIMUM RATINGS 1 plastic. This is approximately +150°C. Even temporarily exceeding this limit may cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of +175°C may result in device failure. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12.6 V Internal Power Dissipation2 Small Outline Package (R) . . . . . . . . . . . . . . . . . . . . 0.75 W SOT-23-5 Package (RT) . . . .
PAGE 5
Typical Performance Characteristics– AD8014 15 2.0 G = +1 VO = 200mV p-p NORMALIZED GAIN – dB 1.0 RF = 1kV 9 VS = 65V RL = 1kV 6 VS = +5V 0 –2.0 –3 –6 –3.0 VO = 1V –4.0 VO = 2V –9 –5.0 –12 –6.0 1 10 100 FREQUENCY – MHz –7.0 1000 Figure 1. Frequency Response, G = +1, VS = ± 5 V and +5 V 3 VS = 65V G = +2 RF = 500V VO = 2V p-p 0 –3 NORMALIZED GAIN – dB NORMALIZED GAIN – dB RL = 1kV 1 10 100 FREQUENCY – MHz 1000 9 6 RL = 75V RL = 50V –6 –9 –12 –15 VO = 0.
PAGE 6
AD8014 7.5 6.2 GAIN FLATNESS – dB RF = 600V 6.0 5.5 RF = 750V 5.0 4.5 VS = 65V 4.0 G = +2 VO = 2V p-p 3.5 3.0 RF = 1kV 5.9 VS = +5V 5.8 5.7 5.6 5.5 G = +2 V = 2V p-p RF = 500V 5.4 5.3 RL = 150V 1 VS = 65V 6.0 RF = 500V 6.5 NORMALIZED GAIN – dB 6.1 RF = 300V 7.0 10 100 FREQUENCY – MHz 5.2 1000 RL = 150V 1 Figure 7. Bandwidth vs. Feedback Resistor—Dual Supply 9 RF = 300V 0 GAIN – dB NORMALIZED GAIN – dB 3 6.5 6.0 RF = 500V 5.5 RF = 750V 5.0 VS = +5V G = +2 VO = 2V p-p 4.
PAGE 7
0 –10 VS = 65V –20 G = +2 RF = 1kV –30 140 0 120 –40 GAIN – dBV PSRR – dB –40 +PSRR –50 –60 –70 –80 –90 –100 0.01 PHASE 100 –PSRR 0.10 1 10 FREQUENCY – MHz 100 –120 80 GAIN 60 –160 40 –200 20 –240 0 1k 1000 –80 10k 100k 1M 10M FREQUENCY – Hz 100M PHASE – Degrees AD8014 –280 1G Figure 16. Transimpedance Gain and Phase vs. Frequency Figure 13. PSRR vs. Frequency 100 –20 –25 –30 OUTPUT RESISTANCE – V 10 –35 VS = +5V CMRR – dB –40 –45 –50 VS = ±5V –55 –60 1 0.
PAGE 8
AD8014 Figure 21 shows the circuit that was used to imitate a photodiode preamp. A photodiode for this application is basically a high impedance current source that is shunted by a small capacitance. In this case, a high voltage pulse from a Picosecond Pulse Labs Generator that is ac-coupled through a 20 kΩ resistor is used to simulate the high impedance current source of a photodiode.
PAGE 9
AD8014 DRIVING CAPACITIVE LOADS The AD8014 easily drives series terminated cables with video signals. Because the AD8014 has such good output drive you can parallel two or three cables driven from the same AD8014. Figure 23 shows the differential gain and phase driving one video cable. Figure 24 shows the differential gain and phase driving two video cables. Figure 25 shows the differential gain and phase driving three video cables. The AD8014 was designed primarily to drive nonreactive loads.
PAGE 10
AD8014 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 5 1 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.25 (0.0098) 0.10 (0.0040) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
PAGE 11
AD8014 REVISION HISTORY Changes to Figure 22 ........................................................................ 8 Updated Outline Dimensions ........................................................10 Changes to Ordering Guide ...........................................................10 ©1998–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08930-0-4/10(C) Rev.