AD845SCHIPS Analog Devices, AD845SCHIPS Datasheet

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AD845SCHIPS

Manufacturer Part Number
AD845SCHIPS
Description
Precision/ 16 MHz CBFET Op Amp
Manufacturer
Analog Devices
Datasheet
a
PRODUCT DESCRIPTION
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/ s, a stable
unity-gain bandwidth of 16 MHz, and a settling time of 350 ns
0.01%—while driving a parallel load of 100 pF and 500 —
represents a combination of features unmatched by any FET
input IC amplifier. The AD845 can easily be used to upgrade
many existing designs which 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, photo diode preamps, sample-and-hold
amplifiers, log amplifiers, and in buffering A/D and D/A con-
verters. The 250 V max input offset voltage makes offset null-
ing 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.
REV. D
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
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 at 20 V p-p
DC PERFORMANCE:
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 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-pin cerdip packages. The commercial version is available in
an 8-pin plastic mini-DIP and 16-pin SOIC; “J” and “S” grade
chips are also available.
PRODUCT HIGHLIGHTS
1. The high slew rate, fast settling time, and dc precision of the
2. The performance of circuits using the LF400, HA2520/2/5,
3. The AD845 is unity-gain stable and internally compensated.
4. The AD845 is specified while driving 100 pF/500
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Plastic Mini-DIP (N) Package
AD845 make it ideal for high speed applications requiring
12-bit accuracy.
HA2620/2/5, 3550, OPA605, and LH0062 can be upgraded
in most cases.
and Cerdip (Q) Package
CONNECTION DIAGRAMS
Precision, 16 MHz
CBFET Op Amp
(R-16) Package
16-Pin SOIC
AD845
Fax: 617/326-8703
loads.

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AD845SCHIPS Summary of contents

Page 1

... REV. D 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. ...

Page 2

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

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... C/watt; cerdip package: JA package: = 100 C/W. JA Model AD845JN AD845KN AD845JR-16 AD845AQ AD845BQ AD845SQ AD845SQ/883B 5962-8964501PA AD845JCHIPS AD845SCHIPS AD845JR-16-REEL AD845JR-16-REEL7 REV. D METALIZATION PHOTOGRAPH 18 V Dimensions shown in inches and (mm). S and – SUBSTRATE CONNECTED 110 C/watt. SOIC JA ORDERING GUIDE ...

Page 4

AD845–Typical Characteristics *N = Plastic DIP Cerdip Small Outline IC (SOIC). Figure 1. Input Voltage Swing vs. Supply Voltage Figure 4. Quiescent Current vs. Supply Voltage Figure 7. Input Bias Current vs. Common-Mode Voltage Figure 2. ...

Page 5

Temperature Figure 10. Open-Loop Gain and Phase Margin vs. Frequency Figure 13. Common-Mode Rejection vs. Frequency Figure 16. Harmonic Distortion REV. D vs. Frequency Figure 11. Open-Loop Gain vs. Supply Voltage Figure 14. Large Signal Frequency Response Figure 17. ...

Page 6

AD845 Figure 19. Recommended Power Supply Bypassing Figure 22a. Unity-Gain Follower Figure 23a. Unity-Gain Inverter Figure 20. AD845 Simplified Schematic Figure 22b. Unity-Gain Follower Large Signal Pulse Response Figure 23b. Unity-Gain Inverter Large Signal Pulse Response –6– Figure 21. Offset ...

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MEASURING AD845 SETTLING TIME The Figure 24 shows the AD845 settling time performance. This measurement 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 28a. Settling Time of the Three Op Amp Instru- mentation Amplifier. Horizontal Scale: 200 ns/Div; Vertical Scale, Positive Pulse Input: 5 V/Div; Output Settling: 1 mV/Div DRIVING THE ANALOG INPUT OF AN A/D CONVERTER An op amp driving ...

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