Burr Brown OPA678AU Datasheet

®

OPA678

OPA678

Wideband Switched-Input

OPERATIONAL AMPLIFIER

OPA678

FEATURES

● FAST SETTLING: 11ns (1%)

● WIDE BANDWIDTH: 200MHz

● TWO LOGIC SELECTABLE INPUTS

● LOW OFFSET VOLTAGE:

±380µV

● FAST INPUT SWITCHING: 4ns

● ACCEPTS TTL/ECL SWITCHING SIGNALS

● UNITY GAIN STABLE

● 16-PIN DIP AND SO-16 PACKAGES

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 compen­sated 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”

APPLICATIONS

● VIDEO AMPLIFICATION AND SWITCHING

● FAST 2-INPUT MULTIPLEXER

● PULSE/RF AMPLIFIERS

● PROGRAMMABLE-GAIN AMPLIFIER

● ACTIVE FILTERS

● SYNCHRONOUS DEMODULATOR

● LOW COST REPLACEMENT FOR OPA675/676

operational amplifier circuit architecture. Unlike “cur­rent-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 suit­able for RF and video applications.

The OPA678 is available in plastic DIP and SO-16
packages.

Input A

A/B Channel

Select Input

(TTL or ECL)

Input B

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©

1992 Burr-Brown Corporation PDS-1136E Printed in U.S.A. March, 1998

–

+

–

+

A

B

Enable

A

Enable

B

Output

Compensation

®

1

OPA678

SPECIFICATIONS

ELECTRICAL

At VCC = ±5VDC, RL = 150Ω, C

PARAMETER CONDITIONS MIN TYP MAX UNITS
INPUT NOISE

(1)

Voltage: fO = 100Hz RS = 0Ω 55 nV/√Hz

f

= 1kHz 21 nV/√Hz

O

f

= 10kHz 7.8 nV/√Hz

O

f

= 100kHz 4.9 nV/√Hz

O

f

= 10Hz to 10MHz 18 µVrms

Current: f

OFFSET VOLTAGE

B

= 10Hz to 1MHz 2.1 pA/√Hz

O

(1)

Input Offset Voltage VCM = 0VDC ±380 ±1.5mV µV
Offset Voltage Drift T
Supply Rejection ±V

BIAS CURRENT

(1)

Input Bias Current VCM = 0VDC 14 50 µA

OFFSET CURRENT

(1)

Input Offset Current VCM = 0VDC 0.2 2 µA

INPUT IMPEDANCE

(1)

Differential 25k  2 Ω  pF
Common-Mode 10

INPUT VOLTAGE RANGE

Common-Mode Input Range 2.0 ±2.5 V
Common-Mode Rejection V

OPEN-LOOP GAIN, DC

(1)

Open-Loop Voltage Gain 50 60 dB

FREQUENCY RESPONSE

Closed-Loop Bandwidth Gain = +1V/V, C

Crosstalk Gain = +1V/V, f = 100kHz –102 dBC

Harmonic Distortion: 5MHz G = +1V/V, R

Large Signal Response

(4)

Slew Rate Gain = +1V/V 250 350 V/µs
Settling Time: 1% Gain = –1V/V, 1V

0.1% 22 ns

0.01% 30 ns
Differential Gain (0V to 0.7V) 4.5MHz, Gain = +2V/V, C
Differential Phase (0V to 0.7V) 4.5MHz, Gain = +2V/V, C

INPUT SELECTION

(5)

Transition Time ECL: Operation 4 8 ns
50% In to 50% Out TTL: Operation 4 8 ns

DIGITAL INPUT

TTL Logic Levels: V

ECL Logic Levels:V

IL

V

IH

I

IL

I

IH

IL

V

IH

I

IL

I

IH

RATED OUTPUT

Voltage Output R

Current Output ±30 ±44 mA
Output Resistance 1MHz, Open-Loop, C
Load Capacitance Stability R
Short Circuit Current Continuous to Gnd +45 mA

= 5pF, and TA = +25°C, unless otherwise noted.

COMP

= T

A

= 4.5V to 5.5V 65 71 dB

CC

(1)

= ±0.5VDC, VO = ±1.25V 75 85 dB

IN

Gain = +2V/V, C
Gain = +5V/V, C

L

Second Harmonic –71 dBC

Third Harmonic –82 dBC

VO = 2.5Vp-p, Gain = +1V/V 32 45 MHz

Logic “LO” 0 +0.8 V

Logic “HI” +2.0 +5 V

Logic “LO”, VIL = 0V –0.05 –0.2 mA

Logic “HI”, VIH = +2.7V 1 20 µA

Logic “LO” –1.81 –1.475 V

Logic “HI” –1.15 – 0.88 V

Logic “LO”, VIL = –1.6V –50 –100 µA

Logic “HI”, VIH = –1.0V –50 –100 µA

R

= 100Ω, Gain = +1V/V, CC = 10pF 17 pF

F

OPA678AP, AU

to T

MIN

MAX

= 9pF 140 200 MHz

C

= 7pF 100 MHz

C

= 1pF 70 MHz

C

±3 ±15 µV/°C

6

5 Ω  pF

f = 1MHz –83 dBC
f = 10MHz –64 dBC
f = 100MHz –44 dBC

= 150Ω, VO = 0.25Vp-p

Step 11 ns

OUT

= 2.2pF 0.02 %

C

= 2.2pF 0.02 Degrees

C

= 150Ω±2.5 ±3.75 V

L

= 50Ω±1.7 ±2.2 V

L

= 5pF 5 Ω

C

(2)

(3)

®

OPA678 2

SPECIFICATIONS (CONT)

ELECTRICAL

At VCC = ±5VDC, RL = 150Ω, C

PARAMETER CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY

Rated Voltage ±V
Derated Performance ±V
Current, Quiescent I

TEMPERATURE RANGE

Specification Ambient Temp AP, AU –40 +85 °C
Thermal Impedance Junction-to-Ambient

AP 90 °C/W
AU 100 °C/W

NOTES: (1) Specifications are for both inputs (A and B). (2) dBC = Level referred to carrier-input signal. (3) Harmonic distortion will typically be improved significantly
in the inverting mode. (4) Large Signal Response is calculated from the formula LSBW = . (5) Switching time from application of digital logic signal to
input signal selection.

ELECTRICAL (FULL TEMPERATURE RANGE SPECIFICATIONS)

At VCC = ±5VDC, RL = 150Ω, C

PARAMETER CONDITIONS MIN TYP MAX UNITS
TEMPERATURE RANGE

Specification Ambient Temp AP/AU –40 +85 °C

OFFSET VOLTAGE

Input Offset Voltage T
Offset Voltage Drift T
Supply Rejection ±V

BIAS CURRENT

Input Bias Current V

OFFSET CURRENT

Input Offset Current V

INPUT VOLTAGE RANGE

Common-Mode Input Range ±2.0 ±2.5 V
Common-Mode Rejection V

OPEN-LOOP GAIN, DC

Open-Loop Voltage Gain 50 60 dB

DIGITAL INPUT

TTL Logic Levels: V

ECL Logic Levels: V

RATED OUTPUT

Voltage Output R

Output Current 44 mA

POWER SUPPLY

Current, Quiescent I

IL

V

IH

I

IL

I

IH

IL

V

IH

I

IL

I

IH

= 5pF, and TA = +25°C, unless otherwise noted.

COMP

CC
CC

= 0mADC 26 30 mA

O

= 5pF, and TA = T

COMP

to T

MIN

, unless otherwise noted.

MAX

= T

to T

A

MIN

= T

to T

A

MIN

= 4.5V to 5.5V 60 70 dB

CC

= 0VDC 15 85 µA

CM

= 0VDC 0.5 5 µA

CM

= ±0.5VDC, VO = ±1.25V 60 80 dB

IN

Logic “LO” 0 +0.8 V

Logic “HI” +2.0 +5 V

Logic “LO", VIL = 0V –0.08 –0.4 mA

Logic “HI”, VIH = +2.7V 5 50 µA

Logic “LO” –1.81 –1.475 V

Logic “HI” –1.15 –0.88 V

Logic “LO”, VIL = –1.6V –50 µA

Logic “HI”, VIH = –1.0V –50 µA

= 150Ω±2.5 ±3.75 V

L

R

= 50Ω±1.5 ±2.0 V

L

= 0mADC 25 35 mA

O

MAX
MAX

2πV

OPA678AP, AU

5 VDC

4.5 5.5 VDC

SR

PEAK

OPA678AP, AU

600 ±2.4mV µV

±3 ± 15 µV/°C

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

3

OPA678

®

Pin Assignments for Differential ECL Channel Switching Pin Assignments for TTL Channel Switching

+In A

–In A

NC

NC

Compensation

Capacitor

NC

+V

1

2

3

4

5

6

7

CC

+–

AB

+–

16

15

14

13

12

11

10

+In B

–In B

DNC

CHA (ECL)

CHA (ECL)

Common

–V

CC

+In A

–In A

NC

NC

Compensation

Capacitor

NC

+V

1

2

+–

+–

3

AB

4

5

6

7

CC

+In B

16

–In B

15

Short to pin 13

14

Short to pin 14

13

CHA (TTL)

12

Common

11

–V

10

CC

Output

8

9

NC

ABSOLUTE MAXIMUM RATINGS

Supply ............................................................................................. ±7VDC

Differential Input Voltage..............................................................Total V

Input Voltage Range (Analog and Digital)...........................................±V

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

Lead Temperature (soldering, 10s)............................................... +300°C

Output Short Circuit to Ground (+25°C) ................... Continuous to ground

Junction Temperature .................................................................... +175°C

CC
CC

PACKAGE INFORMATION

PRODUCT PACKAGE NUMBER

PACKAGE DRAWING

OPA678AP 16-Pin Plastic DIP 180
OPA678AU 16-Pin SOIC 211

NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.

(1)

Output

8

NC

9

ORDERING INFORMATION

Basic Model Number

OPA678

Performance Grade Code

A: –40°C to +85°C

Package Code

P: 16-Pin Plastic DIP
U: 16-Lead SOIC

()()

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degrada­tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.

®

OPA678 4

TYPICAL PERFORMANCE CURVES

NOMINAL FREQUENCY COMPENSATION vs NOISE GAIN

10

8

6

4

2

Compensation Capacitor (pF)

0

1 2 100

10468 204080

Noise Gain (V/V)

60

0
–1
–2
–3
–4
–5
–6

Gain (dB)

–7
–8
–9

–10

A

= +1V/V CLOSED-LOOP

V

SMALL SIGNAL BANDWIDTH

Gain

φ

BW = 200MHz

φ

= 57°

= 8.5pF

C

C

1MHz 16Hz

10MHz 100MHz

Frequency (Hz)

0
–20
–40
–60
–80
–100
–120
–140
–160
–180

Phase (°)

8
7
6
5
4
3
2

Gain (dB)

1

0
–1
–2

0.5

0.4

0.3

A

= +2V/V CLOSED-LOOP

V

SMALL SIGNAL BANDWIDTH

Gain

φ

BW = 103MHz

φ

= 103°

= 3pF

C

C

1MHz 16Hz

10MHz 100MHz

Frequency (Hz)

DIFFERENTIAL GAIN vs CLOSED-LOOP GAIN

(f = 4.5MHz)

60
40
20
0
–20
–40
–60
–80
–100
–120
–140

Phase (°)

Gain (dB)

A

= +5V/V CLOSED-LOOP

V

SMALL SIGNAL BANDWIDTH

15
14

Gain

13
12

φ

11

BW = 69MHz

10

φ

= 119°

9
8

C

= 1pF

C

7
6
5

1MHz 16Hz

10MHz 100MHz

Frequency (Hz)

DIFFERENTIAL PHASE vs CLOSED-LOOP GAIN

0.5

(f = 4.5MHz)

0.4

0.3

60
40
20
0
–20
–40
–60
–80
–100
–120
–140

Phase (°)

0.2

Differential Gain (%)

0.1

0

15

VO = 0V to 2.1V

= 0V to 1.4V

V

O

23

V

= 0V to 0.7V

O

4

Closed-Loop Gain

NOTE: For the gain of +2V/V, C

= 2.2pF; for the gain of +5V/V, CC = 0.

C

0.2

Differential Phase (°)

0.1

VO = 0V to 2.1V

0

15

23

Closed-Loop Gain

NOTE: For the gain of +2V/V, C

5

V

= 0V to 1.4V

O

V

= 0V to 0.7V

O

4

= 2.2pF; for the gain of +5V/V, CC = 0.

C

OPA678

®