OPA688 Datasheet, PDF (1/18 Pages) Burr-Brown (TI) – Unity Gain Stable, Wideband VOLTAGE LIMITING AMPLIFIER

OPA688
OPA688
www.ti.com
TM _{Unity Gain Stable, Wideband}
VOLTAGE LIMITING AMPLIFIER
FEATURES
q HIGH LINEARITY NEAR LIMITING
q FAST RECOVERY FROM OVERDRIVE: 2.4ns
q LIMITING VOLTAGE ACCURACY: ±15mV
q –3dB BANDWIDTH (G = +1): 530MHz
q SLEW RATE: 1000V/µs
q ±5V AND 5V SUPPLY OPERATION
q HIGH GAIN VERSION: OPA689
DESCRIPTION
The OPA688 is a wideband, unity gain stable voltage-
feedback op amp that offers bipolar output voltage lim-
iting. 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 ±15mV. The op amp operates linearly to
within 30mV of the output limit voltages.
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
2.4ns recovery from limiting ensures that overdrive sig-
nals will be transparent to the signal channel. Imple-
LIMITED OUTPUT RESPONSE
2.5
2.0
V_H = –V_L = 2.0V
G = +2
1.5
1.0
V_IN V_O
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
Time (200ns/div)
APPLICATIONS
q FAST LIMITING ADC INPUT BUFFERS
q CCD PIXEL CLOCK STRIPPING
q VIDEO SYNC STRIPPING
q HF MIXERS
q IF LIMITING AMPLIFIERS
q AM SIGNAL GENERATION
q NON-LINEAR ANALOG SIGNAL PROCESSING
q COMPARATORS
menting the limiting function at the output, as opposed to
the input, gives the specified limiting accuracy for any
gain, and allows the OPA688 to be used in all standard
op amp applications.
Non-linear analog signal processing will benefit from
the OPA688’s sharp transition from linear operation to
output limiting. The quick recovery time supports high-
speed applications.
The OPA688 is available in an industry standard pinout
SO-8 package. For higher gain, or transimpedance appli-
cations requiring output limiting with fast recovery,
consider the OPA689.
DETAIL OF LIMITED OUTPUT VOLTAGE
2.10
2.05
2.00
1.95
1.90
V_O
1.85
1.80
1.75
1.70
1.65
1.60
Time (50ns/div)
Copyright © 1997, Texas Instruments Incorporated
SBOS082A
Printed in U.S.A. February, 2001