OPA678AP BURR-BROWN [Burr-Brown Corporation], OPA678AP Datasheet

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OPA678AP

Manufacturer Part Number
OPA678AP
Description
Wideband Switched-Input OPERATIONAL AMPLIFIER
Manufacturer
BURR-BROWN [Burr-Brown Corporation]
Datasheet
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
FEATURES
DESCRIPTION
The OPA678 is a wideband monolithic operational
amplifier with two independent differential inputs.
Either input can be selected by an external TTL or
ECL logic signal. The amplifier is externally compen-
sated and features a very fast input selection speed, 4ns
for either ECL or TTL. This amplifier features fully
symmetrical differential inputs due to its “classical”
©
1992 Burr-Brown Corporation
FAST SETTLING: 11ns (1%)
WIDE BANDWIDTH: 200MHz
TWO LOGIC SELECTABLE INPUTS
LOW OFFSET VOLTAGE: 380 V
FAST INPUT SWITCHING: 4ns
ACCEPTS TTL/ECL SWITCHING SIGNALS
UNITY GAIN STABLE
16-PIN DIP AND SO-16 PACKAGES
®
OPERATIONAL AMPLIFIER
(TTL or ECL)
A/B Channel
Input A
Select Input
Input B
Wideband Switched-Input
+
+
A
B
Enable
Enable
A
B
PDS-1136E
1
APPLICATIONS
operational amplifier circuit architecture. Unlike “cur-
rent-feedback” amplifier designs, the OPA678 may be
used in all op amp applications requiring high speed
and precision.
Low distortion and crosstalk make this amplifier suit-
able for RF and video applications.
The OPA678 is available in plastic DIP and SO-16
packages.
VIDEO AMPLIFICATION AND SWITCHING
FAST 2-INPUT MULTIPLEXER
PULSE/RF AMPLIFIERS
PROGRAMMABLE-GAIN AMPLIFIER
ACTIVE FILTERS
SYNCHRONOUS DEMODULATOR
LOW COST REPLACEMENT FOR OPA675/676
Compensation
Output
OPA678
Printed in U.S.A. March, 1998
OPA678
®

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OPA678AP Summary of contents

Page 1

Wideband Switched-Input OPERATIONAL AMPLIFIER FEATURES FAST SETTLING: 11ns (1%) WIDE BANDWIDTH: 200MHz TWO LOGIC SELECTABLE INPUTS LOW OFFSET VOLTAGE: 380 V FAST INPUT SWITCHING: 4ns ACCEPTS TTL/ECL SWITCHING SIGNALS UNITY GAIN STABLE 16-PIN DIP AND SO-16 PACKAGES DESCRIPTION The ...

Page 2

... Logic “HI” Logic “LO” –1.6V IL Logic “HI” –1. 150 1MHz, Open-Loop 5pF 100 , Gain = +1V/ 10pF F C Continuous to Gnd 2 OPA678AP, AU MIN TYP MAX UNITS 55 nV nV/ Hz 7.8 nV/ Hz 4.9 nV Vrms 2.1 pA/ Hz 380 1.5mV ...

Page 3

... 150 0mADC O 3 OPA678AP, AU MIN TYP MAX UNITS 5 VDC 4.5 5.5 VDC 26 30 –40 +85 90 100 . (5) Switching time from application of digital logic signal to OPA678AP, AU MIN TYP MAX UNITS –40 +85 600 2.4mV 0.5 5 2.0 2 +0.8 +2.0 +5 –0.08 –0.4 ...

Page 4

... Lead Temperature (soldering, 10s) ............................................... +300 C Output Short Circuit to Ground (+25 C) ................... Continuous to ground Junction Temperature .................................................................... +175 C PACKAGE INFORMATION PRODUCT PACKAGE OPA678AP 16-Pin Plastic DIP OPA678AU 16-Pin SOIC NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. ...

Page 5

TYPICAL PERFORMANCE CURVES NOMINAL FREQUENCY COMPENSATION vs NOISE GAIN Noise Gain (V/ +2V/V CLOSED-LOOP V SMALL SIGNAL BANDWIDTH 8 7 Gain ...

Page 6

TYPICAL PERFORMANCE CURVES CHANNEL-TO-CHANNEL CROSSTALK vs FREQUENCY 0 –15 –30 –45 –60 –75 –90 –105 –120 0 Frequency (MHz) 1MHz HARMONIC DISTORTION vs POWER OUTPUT – +1V/V – 5pF 150 ...

Page 7

THEORY OF OPERATION The simplified circuit of the ECL compatible OPA678 is shown in Figure “classical” high-speed op amp architecture with one important exception—the amplifier has two ECL logic selectable differential input stages. An appropriate differential ...

Page 8

APPLICATION TIPS Wideband amplifier circuits require good layout techniques to be successful. The use of short, direct signal paths and heavy (2oz copper recommended) ground planes are abso- lutely necessary to achieve the performance level inherent in the OPA678. Oscillation, ...

Page 9

Square Wave Input TEK 11402 D.S.O. 50 NOTES: (1) 0.1µF to 1.0µF, ceramic mono-block, located at package pin. ( 4.5pF Johanson Thin-Trim FIGURE 2. OPA678 Settling Time Test Circuit. +1Vdc 50 50 20MHz sq. wave 0 to ...

Page 10

FIGURE 4. OPA678 (TTL) Input Selection Time. Input Larger output voltages will have slightly slower switching times due to more slewing of the op amp. 0Vdc 50 20MHz sq. wave 0 to 4V, 50 source FIGURE 6. ...

Page 11

Input – OPA678 – FIGURE 8. OPA678 used as Conventional Op Amp. A wideband video amplifier with 75 ...

Page 12

Input Input 2 – NOTE: (1) 0.1µF to 1.0µF, ceramic mono-block, located at package pin. FIGURE 10. Differential Input Multiplexer with Gain of +2V/ Input 49.9 R FIGURE 11. Receiver Noise ...

Page 13

– Output 16 + – FIGURE 12. Synchronous Modulator/Demodulator (with Gain). Input 300 300 NOTE: (1) 0 1.0 F, ceramic mono-block, located ...

Page 14

Differential Input 200 1 Differential Input 200 2 FIGURE 14. High Input Impedance Differential Input Multiplexer with Gain of 5V/V (14dB). ® OPA678 1/2 OPA2680 – 2 400 400 500 2 + 500 6 1/2 OPA2680 – ...

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