© 1990 Burr-Brown Corporation

PDS-1072F

Printed in U.S.A. April, 1995

Wide Bandwidth

OPERATIONAL TRANSCONDUCTANCE

AMPLIFIER AND BUFFER

APPLICATIONS

q BASE LINE RESTORE CIRCUITS

q VIDEO/BROADCAST EQUIPMENT

q COMMUNICATIONS EQUIPMENT

q HIGH-SPEED DATA ACQUISITION

q WIDEBAND LED DRIVER

q AGC-MULTIPLIER

q NS-PULSE INTEGRATOR

q CONTROL LOOP AMPLIFIER

q 400MHz DIFFERENTIAL INPUT

AMPLIFIER

FEATURES

q WIDE BANDWIDTH: 850MHz

q HIGH SLEW RATE: 3000V/

q LOW DIFFERENTIAL GAIN/PHASE

ERROR: 0.06%/0.02

°

q VERSATILE CIRCUIT FUNCTION

q EXTERNAL I

DESCRIPTION

The OPA660 is a versatile monolithic component

designed for wide-bandwidth systems including high

performance video, RF and IF circuitry. It includes a

wideband, bipolar integrated voltage-controlled cur-

rent source and voltage buffer amplifier.

The voltage-controlled current source or Operational

Transconductance Amplifier (OTA) can be viewed as

an “ideal transistor.” Like a transistor, it has three

terminals—a high-impedance input (base), a low-

impedance input/output (emitter), and the current

output (collector). The OTA, however, is self-biased

and bipolar. The output current is zero-for-zero dif-

ferential input voltage. AC inputs centered about zero

produce an output current which is bipolar and cen-

tered about zero. The transconductance of the OTA

can be adjusted with an external resistor, allowing

bandwidth, quiescent current and gain trade-offs to

be optimized.

The open-loop buffer amplifier provides 850MHz

bandwidth and 3000V/

µs slew rate. Used as a basic

building block, the OPA660 simplifies the design of

AGC amplifiers, LED driver circuits for Fiber Optic

Transmission, integrators for fast pulses, fast control

loop amplifiers, and control amplifiers for capacitive

sensors and active filters.

The OPA660 is packaged in SO-8 surface-mount,

and 8-pin plastic DIP, specified from –40

°C to +85°C.

OTA

B

E

C

3

8

2

56

+1

100

Ω

V

I

200

Ω

R

P

82

Ω

V

O

R

1

C

P

6.4pF

I

R

5

100

Ω

G = 1 +

= 3

X

E

R

3

390

Ω

15

10

5

0

–5

–10

–15

–20

–25

1M

10M

100M

1G

Frequency (Hz)

OPA660 DIRECT-FEEDBACK FREQUENCY RESPONSE

20

–30

100k

0.2Vp-p

5Vp-p

2.8Vp-p

1.4Vp-p

0.6Vp-p

OPA660

OPA660

OPA660

®

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

SBOS007