AD823A Analog Devices, AD823A Datasheet

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AD823A

Manufacturer Part Number
AD823A
Description
Dual, 16 Mhz, Rail-to-rail Fet Input Amplifier
Manufacturer
Analog Devices
Datasheet

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a
PRODUCT DESCRIPTION
The AD823 is a dual precision, 16 MHz, JFET input op amp
that can operate from a single supply of +3.0 V to +36 V, or
dual supplies of
capability with an input voltage range extending below ground
in single supply mode. Output voltage swing extends to within
50 mV of each rail for I
put dynamic range.
Offset voltage of 800 V max, offset voltage drift of 2 V/ C,
input bias currents below 25 pA and low input voltage noise
provide dc precision with source impedances up to a Gigohm.
16 MHz, –3 dB bandwidth, –108 dB THD @ 20 kHz and
22 V/ s slew rate are provided with a low supply current of
2.6 mA per amplifier. The AD823 drives up to 500 pF of direct
capacitive load as a follower, and provides an output current of
15 mA, 0.5 V from the supply rails. This allows the amplifier to
handle a wide range of load conditions.
This combination of ac and dc performance, plus the outstand-
ing load drive capability results in an exceptionally versatile am-
plifier for applications such as A/D drivers, high-speed active
filters, and other low voltage, high dynamic range systems.
REV. 0
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
Single Supply Operation
High Load Drive
Excellent AC Performance on 2.6 mA/Amplifier
Good DC Performance
Low Distortion
Low Noise
No Phase Inversion with Inputs to the Supply Rails
APPLICATIONS
Battery Powered Precision Instrumentation
Photodiode Preamps
Active Filters
12- to 16-Bit Data Acquisition Systems
Medical Instrumentation
Output Swings Rail to Rail
Input Voltage Range Extends Below Ground
Single Supply Capability from +3 V to +36 V
Capacitive Load Drive of 500 pF, G = +1
Output Current of 15 mA, 0.5 V from Supplies
–3 dB Bandwidth of 16 MHz, G = +1
350 ns Settling Time to 0.01% (2 V Step)
Slew Rate of 22 V/ s
800 V Max Input Offset Voltage
2 V/ C Offset Voltage Drift
25 pA Max Input Bias Current
–108 dBc Worst Harmonic @ 20 kHz
16 nV/ Hz @ 10 kHz
1.5 V to 18 V. It has true single supply
OUT
100 A providing outstanding out-
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
The AD823 is available over the industrial temperature range of
–40 C to +85 C and is offered in both 8-pin plastic DIP and
SOIC packages.
Figure 1. Output Swing, V
Figure 2. Small Signal Bandwidth, G = +1
–1
–2
–3
–4
–5
–6
–7
–8
2
1
0
GND
1k
Dual, 16 MHz, Rail-to-Rail
3V
V
G = +1
S
CONNECTION DIAGRAM
OUT1
= +5V
+IN1
–IN1
8-Pin Plastic Mini-DIP
–V
500mV
10k
S
1
2
3
4
8-Lead SOIC
FET Input Amplifier
AD823
FREQUENCY – Hz
and
100k
S
© Analog Devices, Inc., 1995
8
7
6
5
= +3 V, G = +1
1M
+V
OUT2
–IN2
+IN2
R
C
V
S
L
L
200µs
S
= 100k
= 50pF
= +3V
AD823
Fax: 617/326-8703
10M

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AD823A Summary of contents

Page 1

... A/D drivers, high-speed active filters, and other low voltage, high dynamic range systems. REV. 0 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 ...

Page 2

... 0 4.5 V OUT Sourcing to 2.5 V Sinking to 2 Total MIN MAX + MIN MAX –2– AD823A Min Typ Max Units 12 16 MHz 3.5 MHz 320 ns 350 fA/ Hz –108 dBc – ...

Page 3

... 0 2.5 V OUT Sourcing to 1.5 V Sinking to 1 Total MIN MAX MIN MAX –3– AD823 AD823A Min Typ Max Units 12 15 MHz 3.2 MHz 250 ns 300 fA/ Hz –93 dBc – ...

Page 4

... –14 +14.5 V OUT Sourcing Sinking Total MIN MAX + MIN MAX –4– AD823A Typ Max Units 16 MHz 4 MHz 550 ns 650 fA/ Hz –90 dBc –130 dB – ...

Page 5

... C/Watt JA Model AD823AN AD823AR AD823AR-REEL CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD823 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 6

AD823–Typical Characteristics –200 –150 –100 – INPUT OFFSET VOLTAGE – µV Figure 4. Typical Distribution of Input Offset Voltage ...

Page 7

LOAD RESISTANCE – Figure 10. Open-Loop Gain vs. Load Resistance 10k L 100 100 L 1 0.1 –2.5 –2.0 –1.5 –1.0 ...

Page 8

AD823–Typical Characteristics +27 C –1 +125 C –2 –3 –4 –5 0.3 3.27 6.24 9.21 12.18 15.15 18.12 21.09 24.06 27.03 FREQUENCY – MHz Figure 16. Closed Loop Gain vs. Frequency 100 V = ...

Page 9

FREQUENCY – Hz Figure 22. Power Supply Rejection vs. Frequency + + 10k ...

Page 10

AD823–Typical Characteristics 300 50pF 500mV GND Figure 28. Output Swing + 100mV STEP IN G =+1 1.55V 1.45V 25mV ...

Page 11

... Figure 34. Pulse Response max and offset drift are achieved through the use of Analog Devices’ advanced thin-film trimming techniques the 600 MHz T A “Nested Integrator” topology is used in the AD823 (see small- signal schematic shown in Figure 36). The output stage can be ...

Page 12

AD823 The first pole in the denominator is the dominant pole of the amplifier, and occurs at about 18 Hz. This equals the input stage output impedance R1 multiplied by the Miller-multiplied value of C1. The second pole occurs at ...

Page 13

Since the input stage uses n-channel JFETs, input current dur- ing normal operation is negative; the current flows out from the input terminals. If the input voltage is driven more positive than +V – 0.4 V, the input current will ...

Page 14

AD823 Figure FFT plot of the results of driving the AD1672 with the AD823 with no pull-down resistor. The input ampli- tude was 2.15 V p-p and the lower voltage excursion was 350 mV. The input frequency ...

Page 15

V DB –20 –30 –40 –50 –60 1k 10k 100k 1M FREQUENCY – Hz Figure 42. Frequency Response of Filter Single-Supply Half-Wave and Full-Wave Rectifiers An AD823 configured as a unity gain follower and operated with a single ...

Page 16

AD823 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N- 0.25 (6.35) 0.31 PIN 1 (7.87 0.30 (7.62) 0.39 (9.91) MAX 0.035 0.01 (0.89 0.25) 0.165 0.01 (4.19 0.25) 0.011 0.003 0.18 0.03 ...

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