AD844ANZ

Manufacturer Part NumberAD844ANZ
DescriptionIC OPAMP CF 60MHZ 80MA 8DIP
ManufacturerAnalog Devices Inc
AD844ANZ datasheet
 


Specifications of AD844ANZ

Slew Rate2000 V/µsAmplifier TypeCurrent Feedback
Number Of Circuits1-3db Bandwidth60MHz
Current - Input Bias200pAVoltage - Input Offset50µV
Current - Supply6.5mACurrent - Output / Channel80mA
Voltage - Supply, Single/dual (±)±4.5 V ~ 18 VOperating Temperature-40°C ~ 85°C
Mounting TypeThrough HolePackage / Case8-DIP (0.300", 7.62mm)
Op Amp TypeHigh SpeedNo. Of Amplifiers1
Bandwidth60MHzSupply Voltage Range± 4.5V To ± 18V
Amplifier Case StyleDIPNo. Of Pins8
Lead Free Status / RoHS StatusLead free / RoHS CompliantOutput Type-
Gain Bandwidth Product-  
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FEATURES
Wide bandwidth
60 MHz at gain of −1
33 MHz at gain of −10
Slew rate: 2000 V/μs
20 MHz full power bandwidth, 20 V p-p, R
Fast settling: 100 ns to 0.1% (10 V step)
Differential gain error: 0.03% at 4.4 MHz
Differential phase error: 0.16° at 4.4 MHz
Low offset voltage: 150 μV maximum (B Grade)
Low quiescent current: 6.5 mA
Available in tape and reel in accordance with
EIA-481-A standard
APPLICATIONS
Flash ADC input amplifiers
High speed current DAC interfaces
Video buffers and cable drivers
Pulse amplifiers
GENERAL DESCRIPTION
The AD844 is a high speed monolithic operational amplifier
fabricated using the Analog Devices, Inc., junction isolated
complementary bipolar (CB) process. It combines high band-
width and very fast large signal response with excellent dc
performance. Although optimized for use in current-to-voltage
applications and as an inverting mode amplifier, it is also suitable
for use in many noninverting applications.
The AD844 can be used in place of traditional op amps, but its
current feedback architecture results in much better ac perfor-
mance, high linearity, and an exceptionally clean pulse response.
This type of op amp provides a closed-loop bandwidth that is
determined primarily by the feedback resistor and is almost
independent of the closed-loop gain. The AD844 is free from
the slew rate limitations inherent in traditional op amps and
other current-feedback op amps. Peak output rate of change can
be over 2000 V/μs for a full 20 V output step. Settling time is
typically 100 ns to 0.1%, and essentially independent of gain.
The AD844 can drive 50 Ω loads to ±2.5 V with low distortion
and is short-circuit protected to 80 mA.
The AD844 is available in four performance grades and three
package options. In the 16-lead SOIC (RW) package, the AD844J
is specified for the commercial temperature range of 0°C to 70°C.
Rev. F
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. Specifications subject to change without notice. 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.
= 500 Ω
L
Figure 1. 8-Lead PDIP (N) and 8-Lead CERDIP (Q) Packages
The AD844A and AD844B are specified for the industrial
temperature range of −40°C to +85°C and are available in the
CERDIP (Q) package. The AD844A is also available in an 8-lead
PDIP (N). The AD844S is specified over the military temperature
range of −55°C to +125°C. It is available in the 8-lead CERDIP
(Q) package. A and S grade chips and devices processed to
MIL-STD-883B, Rev. C are also available.
PRODUCT HIGHLIGHTS
1.
The AD844 is a versatile, low cost component providing an
excellent combination of ac and dc performance.
2.
It is essentially free from slew rate limitations. Rise and fall
times are essentially independent of output level.
3.
The AD844 can be operated from ±4.5 V to ±18 V power
supplies and is capable of driving loads down to 50 Ω, as
well as driving very large capacitive loads using an external
network.
4.
The offset voltage and input bias currents of the AD844 are
laser trimmed to minimize dc errors; V
μV/°C and bias current drift is typically 9 nA/°C.
5.
The AD844 exhibits excellent differential gain and
differential phase characteristics, making it suitable for a
variety of video applications with bandwidths up to 60 MHz.
6.
The AD844 combines low distortion, low noise, and low
drift with wide bandwidth, making it outstanding as an
input amplifier for flash analog-to-digital converters (ADCs).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
60 MHz 2000 V/μs
Monolithic Op Amp
AD844
FUNCTIONAL BLOCK DIAGRAMS
AD844
NULL
NULL
1
8
–IN
+V
2
7
S
+IN
OUTPUT
3
6
–V
TZ
4
5
S
TOP VIEW
(Not to Scale)
NC
NC
1
16
OFFSETNULL
OFFSETNULL
2
15
–IN
V+
3
14
NC
NC
4
13
+IN
OUTPUT
5
12
NC
TZ
6
11
AD844
V–
NC
7
10
TOP VIEW
NC
NC
8
(Not to Scale)
9
NC = NO CONNECT
Figure 2. 16-Lead SOIC (R) Package
drift is typically 1
OS
www.analog.com
©1989–2009 Analog Devices, Inc. All rights reserved.

AD844ANZ Summary of contents

  • Page 1

    FEATURES Wide bandwidth 60 MHz at gain of −1 33 MHz at gain of −10 Slew rate: 2000 V/μs 20 MHz full power bandwidth p-p, R Fast settling: 100 ns to 0.1% (10 V step) Differential gain error: ...

  • Page 2

    AD844 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagrams ............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 Metallization Photograph ............................................................ 5 ESD ...

  • Page 3

    SPECIFICATIONS T = 25°C and V = ±15 V dc, unless otherwise noted Table 1. Parameter Conditions 1 INPUT OFFSET VOLTAGE MIN MAX vs. Temperature vs. Supply Initial T to ...

  • Page 4

    AD844 Parameter Conditions FREQUENCY RESPONSE 3, 4 Small Signal Bandwidth Gain = −1 Gain = −10 TOTAL HARMONIC DISTORTION f = 100 kHz rms SETTLING TIME 10 V Output Step ±15 V supplies 5 Gain = −1, to ...

  • Page 5

    ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage 1 Power Dissipation Output Short-Circuit Duration Input Common-Mode Voltage Differential Input Voltage Inverting Input Current Continuous Transient Storage Temperature Range (Q) Storage Temperature Range (N, RW) Lead Temperature (Soldering, 60 sec) ESD ...

  • Page 6

    AD844 TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C and V = ±15 V, unless otherwise noted SUPPLY VOLTAGE (±V) Figure 4. −3 dB Bandwidth vs. Supply Voltage ...

  • Page 7

    TEMPERATURE (°C) Figure 10. Inverting Input Bias Current (I ) and Noninverting Input Bias BN Current (I ) vs. Temperature BP 100 10 ±5V SUPPLIES 1 0.1 0.01 10k 100k 1M FREQUENCY ...

  • Page 8

    AD844 INVERTING GAIN-OF-1 AC CHARACTERISTICS +V S 4.7Ω 0.22µ – –IN AD844 + R L 0.22µF 4.7Ω –V S Figure 13. Inverting Amplifier, Gain of −1 ( 1kΩ –6 –12 ...

  • Page 9

    INVERTING GAIN-OF-10 AC CHARACTERISTICS +V S 4.7Ω 0.22µF 500Ω 50Ω – –IN AD844 + R L 0.22µF 4.7Ω –V S Figure 18. Gain of −10 Amplifier –4 100k 1M FREQUENCY (Hz) Figure 19. Gain vs. ...

  • Page 10

    AD844 INVERTING GAIN-OF-10 PULSE RESPONSE 5V 100 20ns Figure 21. Large Signal Pulse Response, Gain = –10, R 500nV 100 500 Ω Figure 22. Small Signal Pulse Response, Gain = −10 ...

  • Page 11

    NONINVERTING GAIN-OF-10 AC CHARACTERISTICS 4.7Ω 0.22µF 450Ω 50Ω – AD844 + –IN 0.22µF 4.7Ω –V S Figure 23. Noninverting Gain of +10 Amplifier –4 100k 1M FREQUENCY (Hz) Figure 24. Gain ...

  • Page 12

    AD844 UNDERSTANDING THE AD844 The AD844 can be used in ways similar to a conventional op amp while providing performance advantages in wideband applications. However, there are important differences in the internal structure that need to be understood to optimize ...

  • Page 13

    Table 3. Gain vs. Bandwidth Gain (MHz) −1 1 kΩ 1 kΩ 35 −1 500 Ω 500 Ω 60 −2 2 kΩ 1 kΩ 15 −2 1 kΩ 500 Ω 30 −5 5 kΩ 1 kΩ 5.2 ...

  • Page 14

    AD844 It is important to understand that the low input impedance at the inverting input is locally generated and does not depend on feedback. This is very different from the virtual ground of a conventional operational amplifier used in the ...

  • Page 15

    USING THE AD844 BOARD LAYOUT As with all high frequency circuits considerable care must be used in the layout of the components surrounding the AD844. A ground plane, to which the power supply decoupling capaci- tors are connected by the ...

  • Page 16

    AD844 DC ERROR CALCULATION Figure 37 shows a model of the dc error and noise sources for the AD844. The inverting input bias current, I feedback resistor the noninverting input bias current, flows BP in the resistance at ...

  • Page 17

    MSB AD568 DIGITAL INPUTS LSB 12 TOP VIEW (Not to Scale) *POWER SUPPLY BYPASS CAPACITORS. HIGH SPEED DAC BUFFER The AD844 performs very well in applications requiring current- to-voltage ...

  • Page 18

    AD844 Figure 45 shows the small signal response for gain control range ( 3.16 V). At small values feedthrough on the PC board becomes troublesome and very careful layout techniques ...

  • Page 19

    OUTLINE DIMENSIONS 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN ...

  • Page 20

    ... AD844 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 ORDERING GUIDE Model Temperature Range AD844AN −40°C to +85°C AD844ANZ 1 −40°C to +85°C AD844ACHIPS −40°C to +85°C AD844AQ −40°C to +85°C AD844BQ −40°C to +85°C AD844JR-16 0°C to 70°C AD844JR-16-REEL 0° ...