OPA820
SBOS303A − JUNE 2004 − REVISED JULY 2004
Unity-Gain Stable, Low-Noise, Voltage-Feedback
Operational Amplifier
FD EATURES
DESCRIPTION
HIGH BANDWIDTH (240MHz, G = +2)
The OPA820 provides a wideband, unity-gain stable,
voltage-feedback amplifier with a very low input noise voltage
and high output current using a low 5.6mA supply current. At
unity-gain, the OPA820 gives > 800MHz bandwidth with < 1dB
peaking. The OPA820 complements this high-speed
operation with excellent DC precision in a low-power device.
A worst-case input offset voltage of 750µV and an offset
current of 400nA give excellent absolute DC precision for
pulse amplifier applications.
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HIGH OUTPUT CURRENT ( 110mA)
LOW INPUT NOISE (2.5nV/√Hz)
LOW SUPPLY CURRENT (5.6mA)
FLEXIBLE SUPPLY VOLTAGE
Dual 2.5V to 6V
Single +5V to +12V
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EXCELLENT DC ACCURACY
Maximum 25°C Input Offset Voltage = 750µV
Maximum 25°C Input Offset Current = 400nA
Minimal input and output voltage swing headroom allow the
OPA820 to operate on a single +5V supply with > 2V output
swing. While not a rail-to-rail (RR) output, this swing will
support most emerging analog-to-digital converter (ADC)
input ranges with lower power and noise than typical RR
output op amps.
PP
AD PPLICATIONS
LOW-COST VIDEO LINE DRIVERS
Exceptionally low dG/dP (0.01%/0.03°) supports low-cost
composite video line driver applications. Existing designs can
use the industry-standard pinout SO-8 package while
emerging high-density portable applications can use the
SOT23-5. Offering the industry’s lowest thermal impedance in
a SOT package, along with full specification over both the
commercial and industrial temperature ranges, gives solid
performance over a wide temperature range.
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ADC PREAMPLIFIERS
ACTIVE FILTERS
LOW-NOISE INTEGRATORS
PORTABLE TEST EQUIPMENT
OPTICAL CHANNEL AMPLIFIERS
LOW-POWER, BASEBAND AMPLIFIERS
CCD IMAGING CHANNEL AMPLIFIERS
OPA650 AND OPA620 UPGRADE
RELATED PRODUCTS
SINGLES
DUALS
TRIPLES
QUADS
FEATURES
OPA354
OPA690
—
OPA2354
OPA2690
OPA2652
OPA2822
—
—
OPA4354 CMOS RR Output
OPA3690
—
—
—
High Slew Rate
SOT23-8
—
—
—
—
Low Noise
—
OPA4820 Quad OPA820
+5V
+5V
REFT
(+3V)
2kΩ
2kΩ
2kΩ
RS
24.9
0.1µF
VIN
Ω
IN
IN
OPA820
Ω
50
100pF
ADS850
14−Bit
10MSPS
−5V
402Ω
0.1µF
402Ω
(+2V) (+1V)
REFB VREF
2kΩ
SEL
AC-Coupled, 14-Bit ADS850 Interface
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semiconductor products and disclaimers thereto appears at the end of this data sheet.
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