1

®

OPA686

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

OPA686

®

Wideband, Low Noise,

Voltage Feedback OPERATIONAL AMPLIFIER

APPLICATIONS

q HIGH DYNAMIC RANGE ADC PREAMP

q LOW NOISE, WIDEBAND,

TRANSIMPEDANCE AMPLIFIER

q WIDEBAND, HIGH GAIN AMPLIFIER

q LOW NOISE DIFFERENTIAL RECEIVER

q VDSL LINE RECEIVER

q ULTRASOUND CHANNEL AMPLIFIER

q IMPROVED REPLACEMENT FOR THE

CLC425

FEATURES

q HIGH BANDWIDTH: 250MHz (G = +10)

q LOW INPUT VOLTAGE NOISE: 1.3nV/

√Hz

q VERY LOW DISTORTION: –90dBc (5MHz)

q HIGH SLEW RATE: 600V/

q HIGH DC ACCURACY

q LOW SUPPLY CURRENT: 12mA

q HIGH GAIN BANDWIDTH PRODUCT:

1600MHz

q STABLE FOR GAINS

DESCRIPTION

The OPA686 combines very high gain bandwidth and large

signal performance with very low input voltage noise while

dissipating a low 12mA supply current. The classical differen-

tial input stage, along with two stages of forward gain and a

high power output stage, combine to make the OPA686 an

exceptionally low distortion amplifier with excellent DC accu-

racy and output drive. The voltage feedback architecture allows

all standard op amp applications to be implemented with very

high performance.

The combination of low input voltage and current noise, along

with a 1.6GHz gain bandwidth product, make the OPA686 an

ideal amplifier for wideband transimpedance stages. As a volt-

age gain stage, the OPA686 is optimized for a flat response at a

gain of +10 and is guaranteed stable down to a noise gain of +7.

High Gain, 20MHz Transimpedance Amplifier

TM

A new external compensation technique can be used to give a

very flat frequency response below the minimum stable gain

for the OPA686, further improving its already exceptional

distortion performance. Using this compensation makes the

OPA686 one of the premier 12- to 14-bit analog-to-digital

converter input drivers. The supply current for the OPA686 is

precisely trimmed to 12.4mA at +25

°C. This, along with

carefully defined supply current tempcos in the input and

output stages, combine to provide exceptional performance

over the full specified temperature range.

OPA686

OPA686

PDS-1370D

Printed in U.S.A. May, 2000

OPA686

+5V

–5V

V

O

50k

Ω

0.1

µF

100pF

50k

Ω

0.2pF

10pF

Photodiode

I

S

–V

B

Supply decoupling

not shown.

λ

100

95

90

85

80

75

70

65

60

Frequency (MHz)

0.1

1

10

100

20log (50k

Ω) = 94dBΩ

OPA686 RELATED PRODUCTS

INPUT NOISE

GAIN BANDWIDTH

SINGLES

DUALS

VOLTAGE (nV/

PRODUCT (MHz)

OPA643

2.3

800

OPA2686

1.3

1600

OPA687

0.95

3600

For most current data sheet and other product

information, visit www.burr-brown.com

SBOS063