AD840 Analog Devices, AD840 Datasheet

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AD840

Manufacturer Part Number
AD840
Description
Wideband, Fast Settling op Amp
Manufacturer
Analog Devices
Datasheet

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PRODUCT DESCRIPTION
The AD840 is a member of the Analog Devices’ family of wide
bandwidth operational amplifiers. This high speed/high precision
family includes, among others, the AD841, which is unity-
gain stable, and the AD842, which is stable at a gain of two or
greater and has 100 mA minimum output current drive. These
devices are fabricated using Analog Devices’ junction isolated
complementary bipolar (CB) process. This process permits a
combination of dc precision and wideband ac performance
previously unobtainable in a monolithic op amp. In addition
to its 400 MHz gain bandwidth product, the AD840 offers
extremely fast settling characteristics, typically settling to within
0.01% of final value in 100 ns for a 10 volt step.
The AD840 remains stable over its full operating temperature
range at closed-loop gains of 10 or greater. It also offers a low
quiescent current of 12 mA maximum, a minimum output
current drive capability of 50 mA, a low input voltage noise of
4 nV/ Hz and a low input offset voltage of 0.3 mV maximum
(AD840K).
The 400 V/ s slew rate of the AD840, along with its 400 MHz
gain bandwidth, ensures excellent performance in video and
pulse amplifier applications. This amplifier is ideally suited for
use in high frequency signal conditioning circuits and wide
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Wideband AC Performance
Precision DC Performance
APPLICATIONS
Video and Pulse Amplifiers
DAC and ADC Buffers
Line Drivers
Available in 14-Pin Plastic DIP, Hermetic Cerdip
MIL-STD-883B Processing Available
Gain Bandwidth Product: 400 MHz (Gain
Fast Settling: 100 ns to 0.01% for a 10 V Step
Slew Rate: 400 V/ s
Stable at Gains of 10 or Greater
Full Power Bandwidth: 6.4 MHz for 20 V p-p into a
Input Offset Voltage: 0.3 mV max
Input Offset Drift: 3 V/ C typ
Input Voltage Noise: 4 nV/ Hz
Open-Loop Gain: 130 V/mV into a 1 k
Output Current: 50 mA min
Supply Current: 12 mA max
and 20-Pin LCC Packages and in Chip Form
500
Load
Load
10)
APPLICATION HIGHLIGHTS
1. The high slew rate and fast settling time of the AD840 make
2. The AD840 is truly a precision amplifier. It offers 12-bit
3. The AD840’s thermally balanced layout and the high speed
4. Laser wafer trimming reduces the input offset voltage to
5. Full differential inputs provide outstanding performance
6. The AD840 is an enhanced replacement for the HA2540.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
bandwidth active filters. The extremely rapid settling time of the
AD840 makes it the preferred choice for data acquisition appli-
cations which require 12-bit accuracy. The AD840 is also ap-
propriate for other applications such as high speed DAC and
ADC buffer amplifiers and other wide bandwidth circuitry.
it ideal for DAC and ADC buffers, line drivers and all types
of video instrumentation circuitry.
accuracy to 0.01% or better and wide bandwidth, perfor-
mance previously available only in hybrids.
of the CB process allow the AD840 to settle to 0.01% in
100 ns without the long “tails” that occur with other fast op
amps.
0.3 mV max on the K grade, thus eliminating the need for
external offset nulling in many applications. Offset null pins
are provided for additional versatility.
in all standard high frequency op amp applications where
circuit gain will be 10 or greater.
Plastic DIP (N) Package
Cerdip (Q) Package
and
CONNECTION DIAGRAMS
Fast Settling Op Amp
LCC (E) Package
Wideband,
AD840
Fax: 617/326-8703

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AD840 Summary of contents

Page 1

... Hz and a low input offset voltage of 0.3 mV maximum (AD840K). The 400 V/ s slew rate of the AD840, along with its 400 MHz gain bandwidth, ensures excellent performance in video and pulse amplifier applications. This amplifier is ideally suited for use in high frequency signal conditioning circuits and wide REV ...

Page 2

... MAX 400 = 500 5.5 6.4 5 350 400 350 80 100 190 350 0.025 0. MAX 90 100 MAX 0 0 +75 72 –2– AD840K AD840S Min Typ Max Min Typ Max 0.1 0.3 0 3 0.1 0.2 0.1 0.4 0.3 0 115 90 110 85 ...

Page 3

... –55 C and T = +125 does not exceed J Derate at 8.7 mW mW/ C 6.7 mW AD840 Connection Diagrams METALIZATION PHOTOGRAPH Contact factory for latest dimensions. Dimensions shown in inches and (mm). –3– AD840 Plastic DIP (N) Package and Cerdip (Q) Package LCC (E) Package ...

Page 4

... AD840–Typical Characteristics Figure 1. Input Common-Mode Range vs. Supply Voltage Figure 4. Quiescent Current vs. Supply Voltage Figure 7. Quiescent Current vs. Temperature (at +25 C and unless otherwise noted) S Figure 2. Output Voltage Swing vs. Supply Voltage Figure 5. Input Bias Current vs. Temperature Figure 8. Short-Circuit Current Limit vs. Temperature –4– ...

Page 5

... Rejection vs. Frequency Figure 16. Harmonic Distortion vs. Frequency REV. C Figure 11. Open-Loop Gain vs. Supply Voltage Figure 14. Large Signal Frequency Response Figure 17. Input Voltage Noise Spectral Density –5– AD840 Figure 12. Power Supply Rejection vs. Frequency Figure 15. Output Swing and Error vs. Settling Time Figure 18. Slew Rate vs. Temperature ...

Page 6

... Figure 19b. Inverter Large Signal Pulse Response Figure 20b. Noninverting Large Signal Pulse Response OFFSET NULLING The input offset voltage of the AD840 is very low for a high speed op amp, but if additional nulling is required, the circuit shown in Figure 21 can be used. –6– Figure 19c. Inverter Small Signal Pulse Response Figure 20c ...

Page 7

... REV. C Figure 24 shows the “long-term” stability of the settling charac- teristics of the AD840 output after step. There is no evi- dence of settling tails after the initial transient recovery time. The use of a junction isolated process, together with careful lay- ...

Page 8

... AD840 HIGH SPEED DAC BUFFER CIRCUIT The AD840’s 100 ns settling time to 0.01% for step makes it well suited as an output buffer for high speed D/A con- verters. Figure 25 shows the connections for producing +10.24 V output swing from the AD568 35 ns DAC. With the AD568 in unbuffered voltage output mode, the AD840 is placed in noninverting configuration ...

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