Manufacturer Part NumberAD845JN
ManufacturerAnalog Devices Inc
AD845JN datasheet

Specifications of AD845JN

Slew Rate100 V/µsMounting TypeThrough Hole
Rohs StatusRoHS non-compliantAmplifier TypeJ-FET
Number Of Circuits1Gain Bandwidth Product16MHz
Current - Input Bias750pAVoltage - Input Offset700µV
Current - Supply10mACurrent - Output / Channel50mA
Voltage - Supply, Single/dual (±)±4.75 V ~ 18 VOperating Temperature0°C ~ 70°C
Package / Case8-DIP (0.300", 7.62mm)No. Of Amplifiers1
Bandwidth16MHzNo. Of Pins8
Operating Temperature Range0°C To +70°CSettling Time250ns
Operating Temperature Max70°COutput Type-
-3db Bandwidth-  
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Replaces Hybrid Amplifiers in Many Applications
Settles to 0.01% in 350 ns
100 V/ s Slew Rate
12.8 MHz Min Unity Gain Bandwidth
1.75 MHz Full Power Bandwidth at 20 V p-p
0.25 mV Max Input Offset Voltage
5 V/ C Max Offset Voltage Drift
0.5 nA Input Bias Current
250 V/mV Min Open-Loop Gain
4 V p-p Max Voltage Noise, 0.1 Hz to 10 Hz
94 dB Min CMRR
Available in Plastic Mini-DIP, Hermetic CERDIP, and
SOIC Packages. Also Available in Tape and Reel in
Accordance with EIA-481A Standard
The AD845 is a fast, precise, N channel JFET input, monolithic
operational amplifier. It is fabricated using Analog Devices’
complementary bipolar (CB) process. Advanced laser-wafer
trimming technology enables the very low input offset voltage
and offset voltage drift performance to be realized. This preci-
sion, when coupled with a slew rate of 100 V/ms, a stable unity
gain bandwidth of 16 MHz, and a settling time of 350 ns to
0.01%—while driving a parallel load of 100 pF and 500 W—
represents a combination of features unmatched by any FET
input IC amplifier. The AD845 can easily be used to upgrade
many existing designs that use BiFET or FET input hybrid
amplifiers and, in some cases, those which use bipolar input
op amps.
The AD845 is ideal for use in applications such as active filters,
high speed integrators, photodiode preamps, sample-and-hold
amplifiers, and log amplifiers, and for buffering A/D and D/A
converters. The 250 mV max input offset voltage makes offset
nulling unnecessary in many applications. The common-mode
rejection ratio of 110 dB over a ± 10 V input voltage range
represents exceptional performance for a JFET input high
speed op amp. This, together with a minimum open-loop
gain of 250 V/mV ensures that 12-bit performance is achieved,
even in unity gain buffer circuits.
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
Precision, 16 MHz
Plastic Mini-DIP (N) Package
and CERDIP (Q) Package
The AD845 conforms to the standard op amp pinout except
that offset nulling is to V+. The AD845J and AD845K grade
devices are available specified to operate over the commercial
0∞C to 70∞C temperature range. AD845A and AD845B
devices are specified for operation over the –40∞C to +85∞C
industrial temperature range. The AD845S is specified to oper-
ate over the full military temperature range of –55∞C to +125∞C.
Both the industrial and military versions are available in 8-lead
CERDIP packages. The commercial version is available in an
8-lead plastic mini-DIP and 16-lead SOIC; J and S grade chips
are also available.
1. The high slew rate, fast settling time, and dc precision of the
AD845 make it ideal for high speed applications requiring
12-bit accuracy.
2. The performance of circuits using the LF400, HA2520,
HA2522, HA2525, HA2620, HA2622, HA2625, 3550,
OPA605, and LH0062 can be upgraded in most cases.
3. The AD845 is unity gain stable and internally compensated.
4. The AD845 is specified while driving 100 pF/500 W loads.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.
16-Lead SOIC
(R-16) Package

AD845JN Summary of contents

  • Page 1

    FEATURES Replaces Hybrid Amplifiers in Many Applications AC PERFORMANCE: Settles to 0.01% in 350 ns 100 V/ s Slew Rate 12.8 MHz Min Unity Gain Bandwidth 1.75 MHz Full Power Bandwidth p-p DC PERFORMANCE: 0.25 mV ...

  • Page 2

    AD845–SPECIFICATIONS Parameter Conditions 1 INPUT OFFSET VOLTAGE Initial Offset MIN Offset Drift 2 INPUT BIAS CURRENT Initial MIN INPUT OFFSET CURRENT Initial ...

  • Page 3

    ... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Mini-DIP package 100∞C/W; CERDIP package package 100∞C/W. JA Model AD845JN AD845KN AD845JR-16 AD845JR-16-REEL AD845JR-16-REEL7 AD845AQ AD845BQ AD845SQ AD845SQ/883B 2 5962-8964501PA ...

  • Page 4

    AD845–Typical Performance Characteristics TPC 1. Input Voltage Swing vs. Supply Voltage TPC 4. Quiescent Current vs. Supply Voltage TPC 7. Input Bias Current vs. Common-Mode Voltage TPC 2. Output Voltage Swing vs. Supply Voltage TPC 5. Input Bias Current vs. ...

  • Page 5

    TPC 10. Open-Loop Gain and Phase Margin vs. Frequency TPC 13. Common-Mode Rejection vs. Frequency TPC 16. Harmonic Distortion vs. Frequency REV. E TPC 11. Open-Loop Gain vs. Supply Voltage TPC 14. Large Signal Frequency Response TPC 17. Input Noise ...

  • Page 6

    AD845 TPC 19. Recommended Power Supply Bypassing TPC 22. Unity Gain Follower TPC 25. Unity Gain Inverter TPC 20. AD845 Simplified Schematic TPC 23. Unity Gain Follower Large Signal Pulse Response TPC 26. Unity Gain Inverter Large Signal Pulse Response ...

  • Page 7

    MEASURING AD845 SETTLING TIME Figure 1 shows AD845 settling time performance. This measure- ment was accomplished by driving the amplifier in the unity gain inverting mode with a fast pulse generator. The input summing junction was measured using false nulling ...

  • Page 8

    AD845 Figure 5. Settling Time of the 3-Op Amp Instrumentation Amplifier. Horizontal Scale is 200 ns/Div, Vertical Scale, Positive Pulse Input is 5 V/Div and Output Settling is 1 mV/Div. DRIVING THE ANALOG INPUT OF AN A/D CONVERTER An op ...

  • Page 9

    Plastic Dual In-Line Package [PDIP] (N-8) Dimensions shown in inches and (millimeters) 0.375 (9.53) 0.365 (9.27) 0.355 (9.02 0.295 (7.49) 0.285 (7.24) 0.275 (6.98 0.100 (2.54) BSC 0.015 0.180 (0.38) (4.57) MIN MAX 0.150 (3.81) ...

  • Page 10

    AD845 Revision History Location 10/03—Data Sheet changed from REV REV. E. Renumbered figures and TPCs . . . . . . . . . . . . . . . . . . . . . . . ...

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