REV. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its u, nor for any infringements of patents or other rights of third parties which may result from its u. No licen is granted by implication or otherwi under any patent or patent rights of Analog Devices.
a
Precision, 16 MHz CBFET Op Amp
AD845
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.Tel: 617/329-4700Fax: 617/326-8703
CONNECTION DIAGRAMS
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 Offt Voltage 5 V/؇C max Offt Voltage Drift 0.5 nA Input Bias Current
250 V/mV min Open-Loop Gain
4 V p-p max Voltage Noi, 0.1 Hz to 10 Hz 94 dB min CMRR
电脑验机
Available in Plastic Mini-DIP, Hermetic Cerdip and SOIC Packages. Also Available in Tape and Reel in Accordance with EIA-481A Standard
PRODUCT DESCRIPTION
The AD845 is a fast, preci, N channel JFET input, monolithic operational amplifier. It is fabricated using Analog Devices’complementary bipolar (CB) process. Advanced lar-wafer trimming technolo
gy enables the very low input offt voltage and offt voltage drift performance to be realized. This preci-sion, when coupled with a slew rate of 100 V/µs, a stable
unity-gain bandwidth of 16 MHz, and a ttling time of 350 ns 0.01%—while driving a parallel load of 100 pF and 500 Ω—reprents a combination of features unmatched by any FET input IC amplifier. The AD845 can easily be ud to upgrade many existing designs which u BiFET or FET input hybrid amplifiers and, in some cas, tho which u bipolar input op amps.
The AD845 is ideal for u 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 µV max input offt voltage makes offt null-ing unnecessary in many applications. The common-mode rejection ratio of 110 dB over a ±10 V input voltage range reprents 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.
The AD845 conforms to the standard op amp pinout except that offt 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 ttling 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, HA2520/2/5,HA2620/2/5, 3550, OPA605, and LH0062 can be upgraded in most cas.
3.The AD845 is unity-gain stable and internally compensated.
4.The AD845 is specified while driving 100 pF/500 Ω loads.
Plastic Mini-DIP (N) Package and Cerdip (Q) Package
16-Pin SOIC
(R-16) Package
AD845–SPECIFICATIONS REV. D
–2–(@ +25؇C and ؎15 V dc, unless otherwi noted)
Model
AD845J/A AD845K/B AD845S Conditions
Min
Typ Max Min
Typ Max Min
Typ Max Units INPUT OFFSET VOLTAGE 1
Initial Offt
0.7
开心激1.50.10.25
0.25
1.0mV T MIN –T MAX
2.50.4 2.0mV Offt Drift
20 1.5 5.010µV/°C INPUT BIAS CURRENT 2
Initial V CM = 0 V 0.75
20.5
10.75
2nA T MIN –T MAX 45/7518/38500nA INPUT OFFSET CURRENT Initial V CM = 0 V 253001510025
300pA T MIN –T MAX
3/6.5
1.2/
2.6
20
nA INPUT CHARACTERISTICS Input Resistance 101110111011k ΩInput Capacitance 4.0 4.0 4.0pF INPUT VOLTAGE RANGE Differential ±20
±20
±20
V Common Mode
؎10+10.5/–13؎10+10.5/–13؎10+10.5/–13V Common-Mode Rejection V CM = ±10 V 861109411386
110dB INPUT VOLTAGE NOISE
0.1 Hz to 10 Hz 444µV p-p f = 10 Hz 808080nV/√Hz f = 100 Hz 606060nV/√Hz f = 1 kHz 252525nV/√Hz f = 10 kHz 181818nV/√Hz f = 100 kHz 121212nV/√Hz INPUT CURRENT NOISE f = 1 kHz 0.1
0.10.1pA/√Hz OPEN-LOOP GAIN
房子的房怎么写
V O = ±10 V R LOAD ≥ 2 k Ω200500250500200500V/mV R LOAD ≥ 500 Ω100250
125250
100250
V/mV T MIN –T MAX
707550V/mV OUTPUT CHARACTERISTICS Voltage R LOAD ≥ 500 Ω؎12.5孩子营养早餐
؎12.5
؎12.5
V Current Short Circuit 505050mA Output Resistance Open Loop 5
55ΩFREQUENCY RESPONSE Small Signal
Unity Gain 12.8
1613.6
1613.6
物流运营16MHz Full Power Bandwidth 3
V O = ±10 V R LOAD = 500 Ω
1.75 1.75 1.75MHz Ri Time 202020ns Overshoot 202020%Slew Rate 80
100
94100
94
100
V/µs
Settling Time
10 V Step
C LOA
D = 100 pF R LOAD = 500 Ωto 0.01%350350500
350500
ns to 0.1%250250250ns DIFFERENTIAL GAIN f = 4.4 MHz 0.040.040.04%DIFFERENTIAL PHASE f = 4.4 MHz
0.020.020.02Degree POWER SUPPLY Rated Performance ±15
±15
±15
V Operating Range ؎4.75
؎18
؎4.75؎18
؎4.75؎18V Rejection Ratio V S = ±5 to ±15 V 8811095
11388110
dB Quiescent Current
T MIN to T MAX
10
12
10
12
黄胄简介10
12
mA
NOTES 1
Input offt voltage specifications are guaranteed after 5 minutes of operation at T A = +25°C.2
Bias current specifications are guaranteed maximum at either input after 5 minutes of operation at T A = +25°C.3
FPBW = slew rate/2 π V peak.4
“S” grade T MIN –T MAX are tested with automatic test equipment at T A = –55°C and T A = +125°C.
All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final electrical test. Results from the tests are ud to calculate outgoing quality levels.
Specifications subject to change without notice.
AD845
墨子的思想主张是什么REV. D –3–
ORDERING GUIDE
Temperature Package Package Model
Range
Description
Option*
AD845JN 0°C to +70°C 8-Pin Plastic Mini-DIP N-8AD845KN 0°C to +70°C 8-Pin Plastic Mini-DIP N-8AD845JR-160°C to +70°C 16-Pin SOIC R-16AD845AQ –40°C to +85°C 8-Pin Cerdip Q-8AD845BQ –40°C to +85°C 8-Pin Cerdip Q-8AD845SQ
–55°C to +125°C 8-Pin Cerdip Q-8AD845SQ/883B –55°C to +125°C 8-Pin Cerdip Q-85962-8964501PA –55°C to +125°C 8-Pin Cerdip Q-8
AD845JCHIPS 0°C to +70°C Die AD845SCHIPS –55°C to +125°C Die
AD845JR-16-REEL 0°C to +70°C Tape & Reel AD845JR-16-REEL70°C to +70°C Tape & Reel
ABSOLUTE MAXIMUM RATINGS 1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V Internal Power Dissipation 2
Plastic Mini-DIP . . . . . . . . . . . . . . . . . . . . . . . . . .1.6 Watts Cerdip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4 Watts 16-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5 Watts Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+ V S Output Short-Circuit Duration . . . . . . . . . . . . . . . .Indefinite Differential Input Voltage . . . . . . . . . . . . . . . . . .+V S and –V S Storage Temperature Range
Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +150°C N, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +125°C Lead Temperature Range (Soldering 60 c) . . . . . . . .+300°C
NOTES 1
Stress above tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. This is a stress rating only, and functional operation of the device at the or any other conditions above tho indicated in the operational ctions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability .2
Mini-DIP package: θJA = 100°C/watt; cerdip package: θJA = 110°C/watt. SOIC package: θJA = 100°C/W.
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).Contact factory for latest dimensions.
SUBSTRATE CONNECTED TO +V S
*N = Plastic DIP: Q = Cerdip; R = 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.
AD845–Typical Characteristics
REV. D
–4–
Common-Mode Voltage
Figure 2.Output Voltage Swing
vs. Supply Voltage
Figure 5.Input Bias Current vs.
Temperature Figure 8.Short-Circuit Current
Limit vs. Temperature
Figure 3.Output Voltage Swing
vs. Resistive Load
Figure 6.Magnitude of Output
Impedance vs. Frequency
Figure 9.Unity-Gain Bandwidth
AD845
REV. D –5–
vs. Temperature
Figure 10.Open-Loop Gain and
河北省景点
Pha Margin vs. Frequency Figure 13.Common-Mode
Rejection vs. Frequency Figure 16.Harmonic Distortion
vs. Frequency
Figure 11.Open-Loop Gain vs.
Supply Voltage Figure 14.Large Signal Frequency
Respon Figure 17.Input Noi Voltage
Spectral Density
Figure 12.Power Supply
Rejection vs. Frequency
Figure 15. Output Swing and
Error vs. Settling Time
Figure 18.Slew Rate vs. Temperature
