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Wideband, High Gain

VOLTAGE LIMITING AMPLIFIER

OPA699

SBOS261D – NOVEMBER 2002 – REVISED DECEMBER 2008

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright © 2002-2008, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

FEATURES

q HIGH LINEARITY NEAR LIMITING

q FAST RECOVERY FROM OVERDRIVE: 1ns

q LIMITING VOLTAGE ACCURACY:

±10mV

q –3dB BANDWIDTH (G = +6): 260MHz

q GAIN BANDWIDTH PRODUCT: 1000MHz

q STABLE FOR G

≥ +4V/V

q SLEW RATE: 1400V/

µs

q

±5V AND +5V SUPPLY OPERATION

q LOW GAIN VERSION: OPA698

APPLICATIONS

q TRANSIMPEDANCE WITH FAST

OVERDRIVE RECOVERY

q FAST LIMITING ADC INPUT DRIVER

q LOW PROP DELAY COMPARATOR

q NONLINEAR ANALOG SIGNAL

PROCESSING

q DIFFERENCE AMPLIFIER

q IF LIMITING AMPLIFIER

q OPA689 UPGRADE

DESCRIPTION

The OPA699 is a wideband, voltage-feedback op amp that

offers bipolar output voltage limiting, and is stable for gains

≥ +4. Two buffered limiting voltages take control of the output

when it attempts to drive beyond these limits. This new

output limiting architecture holds the limiter offset error to

±10mV. The op amp operates linearly to within 20mV of the

limits.

The combination of narrow nonlinear range and low limiting

offset allows the limiting voltages to be set within 100mV of

the desired linear output range. A fast 1ns recovery from

limiting ensures that overdrive signals will be transparent to

the signal channel. Implementing the limiting function at the

output, as opposed to the input, gives the specified limiting

accuracy for any gain, and allows the OPA699 to be used in

all standard op amp applications.

Nonlinear analog signal processing circuits will benefit from

the OPA699 sharp transition from linear operation to output

limiting. The quick recovery time supports high-speed applica-

tions.

The OPA699 is available in an industry-standard pinout in an

SO-8 package. For lower gain applications requiring output

limiting with fast recovery, consider the OPA698.

OPA6

99

OPA699

V

IN

R

G

374

Ω

R

F

750

Ω

C

F

4pF

C

S

18pF

V

OUT

V

OUT = –2VIN

V

H

+5V

–5V

V

L

Low Gain, Improved SFDR Amplifier with Output Limiting