OPA843
OPA
843
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SBOS268C – DECEMBER 2002 – DECEMBER 2008
Wideband, Low Distortion, Medium Gain,
Voltage-Feedback OPERATIONAL AMPLIFIER
FEATURES
DESCRIPTION
q HIGH BANDWIDTH: 260MHz (G = +5)
The OPA843 provides a level of speed and dynamic range
previously unattainable in a monolithic op amp. Using a high
Gain Bandwidth (GBW), two gain-stage design, the OPA843
gives a medium gain range device with exceptional dynamic
range. The “classic” differential input complements this high
dynamic range with DC precision beyond most high-speed
amplifier products. Very low input offset voltage and current,
high Common-Mode Rejection Ratio (CMRR) and PowerSupply Rejection Ratio (PSRR), and high open-loop gain
combine to give a high DC precision amplifier along with low
noise and high 3rd-order intercept.
q GAIN BANDWIDTH PRODUCT: 800MHz
q LOW INPUT VOLTAGE NOISE: 2.0nV/ √Hz
q VERY LOW DISTORTION: –96dBc (5MHz)
q HIGH OPEN-LOOP GAIN: 110dB
q FAST 12-BIT SETTLING: 10.5ns (0.01%)
q LOW INPUT OFFSET VOLTAGE: 300µV
q OUTPUT CURRENT: ±100mA
12- to 16-bit converter interfaces will benefit from this combination of features. High-speed transimpedance applications
can be implemented with exceptional DC precision as well.
Differential configurations using two OPA843s can deliver
very low distortion to high output voltages, as shown below.
APPLICATIONS
q ADC/DAC BUFFER AMPLIFIER
q LOW DISTORTION “IF” AMPLIFIER
q ACTIVE FILTERS
q LOW-NOISE RECEIVER
OPA843 RELATED PRODUCTS
q WIDEBAND TRANSIMPEDANCE
SINGLES
q PROFESSIONAL AUDIO
q OPA643 UPGRADE
INPUT NOISE
VOLTAGE (nV/ √Hz )
GAIN-BANDWIDTH
PRODUCT (MHz)
OPA842
OPA846
OPA847
q TEST INSTRUMENTATION
2.6
1.2
0.85
200
1750
3900
+5V
DIFFERENTIAL DISTORTION vs OUTPUT VOLTAGE
OPA843
–85
VI
50Ω
1:1
132Ω
402Ω
40.2Ω
402Ω
Harmonic Distortion (dBc)
–5V
40.2Ω
RL
400Ω
VO = 10VI
+5V
GD = 10
RL = 400Ω
F = 5MHz
–90
–95
2nd-Harmonic
–100
3rd-Harmonic
–105
OPA843
–110
1
–5V
10
Output Voltage Swing (Vp-p)
Very Low Distortion Differential Driver
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.
Copyright © 2002-2008, Texas Instruments Incorporated
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.
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