Analog Devices AD844SQ-883B, AD844SQ, AD844SCHIPS, AD844JR-16-REEL7, AD844JR-16-REEL Datasheet
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60 MHz, 2000 V/s
a
FEATURES
Wide Bandwidth: 60 MHz at Gain of –1
Wide Bandwidth: 33 MHz at Gain of –10
Very High Output Slew Rate: Up to 2000 V/s
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: 0.158 at 4.4 MHz
High Output Drive: 650 mA into 50 Load
Low Offset Voltage: 150 mV Max (B Grade)
Low Quiescent Current: 6.5 mA
Available in Tape and Reel in Accordance with
EIA-481A Standard
APPLICATIONS
Flash ADC Input Amplifiers
High-Speed Current DAC Interfaces
Video Buffers and Cable Drivers
Pulse Amplifiers
PRODUCT DESCRIPTION
The AD844 is a high-speed monolithic operational amplifier
fabricated using Analog Devices’ junction isolated complementary bipolar (CB) process. It combines high bandwidth 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 performance, high linearity and an exceptionally clean pulse response.
This type of op amp provides a closed-loop bandwidth which 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 (R) package, the AD844J is
specified for the commercial temperature range of 0°C to 70°C.
The AD844A and AD844B are specified for the industrial temperature range of –40°C to +85°C and are available in the cerdip (Q)
= 500
L
Monolithic Op Amp
AD844
CONNECTION DIAGRAMS
8-Lead Plastic (N),
and Cerdip (Q) Packages
NULL
–IN
+IN
–V
1
2
3
4
S
(Not to Scale)
AD844
TOP VIEW
8
NULL
7
+V
6
OUTPUT
5
TZ
S
OFFSETNULL
package. The AD844A is also available in an 8-lead plastic
mini-DIP (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
1 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 A/D converters.
16-Lead SOIC
(R) Package
1
NC
AD844
2
3
–IN
4
NC
5
+IN
6
NC
7
V–
TOP VIEW
8
NC
(Not to Scale)
NC = NO CONNECT
drift is typically
OS
16
NC
15
OFFSETNULL
14
V+
13
NC
12
OUTPUT
11
TZ
10
NC
9
NC
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2001
AD844–SPECIFICATIONS
(@ TA = 25C and VS = 15 V dc, unless otherwise noted)
Model Conditions Min Typ Max Min Typ Max Min Typ Max Unit
AD844J/A AD844B AD844S
INPUT OFFSET VOLTAGE
T
MIN–TMAX
1
50 300 50 150 50 300 µV
75 500 75 200 125 500 µV
vs. Temperature 1 1 5 1 5 µV/°C
vs. Supply 5 V–18 V
Initial 4 20 4 10 4 20 µV/V
T
MIN–TMAX
vs. Common Mode V
= ±10 V
CM
4410420µV/V
Initial 10 35 10 20 10 35 µV/V
T
MIN–TMAX
INPUT BIAS CURRENT
–Input Bias Current
T
MIN–TMAX
1
10 10 20 10 35 µV/V
200 450 150 250 200 450 nA
800 1500 750 1100 1900 2500 nA
vs. Temperature 9 9 15 20 30 nA/°C
vs. Supply 5 V–18 V
Initial 175 250 175 200 175 250 nA/V
T
MIN–TMAX
vs. Common Mode V
= ±10 V
CM
220 220 240 220 300 nA/V
Initial 90 160 90 110 90 160 nA/V
T
MIN–TMAX
+Input Bias Current
T
MIN–TMAX
1
110 110 150 120 200 nA/V
150 400 100 200 100 400 nA
350 700 300 500 800 1300 nA
vs. Temperature 3 3 7 7 15 nA/°C
vs. Supply 5 V–18 V
Initial 80 150 80 100 80 150 nA/V
T
MIN–TMAX
vs. Common Mode V
= ±10 V
CM
100 100 120 120 200 nA/V
Initial 90 150 90 120 90 150 nA/V
T
MIN–TMAX
130 130 190 140 200 nA/V
INPUT CHARACTERISTICS
Input Resistance
–Input 50 65 50 65 50 65 Ω
+Input 7 10 7 10 7 10 MΩ
Input Capacitance
–Input 2 2 2 pF
+Input 2 2 2 pF
Input Voltage Range
Common Mode ±10 ±10 ±10 V
INPUT VOLTAGE NOISE f ≥ 1 kHz 2 2 2 nV/√Hz
INPUT CURRENT NOISE
–Input f ≥ 1 kHz 10 10 10 pA/√Hz
+Input f ≥ 1 kHz 12 12 12 pA/√Hz
OPEN LOOP TRANSRESISTANCE V
T
MIN–TMAX
= ±10 V
OUT
= 500 Ω 2.2 3.0 2.8 3.0 2.2 3.0 MΩ
R
LOAD
1.3 2.0 1.6 2.0 1.3 1.6 MΩ
Transcapacitance 4.5 4.5 4.5 pF
DIFFERENTIAL GAIN ERROR
2
f = 4.4 MHz 0.03 0.03 0.03 %
DIFFERENTIAL PHASE ERROR2f = 4.4 MHz 0.15 0.15 0.15 Degree
FREQUENCY RESPONSE
Small Signal Bandwidth
Gain = –1
Gain = –10
TOTAL HARMOMIC DISTORTION f = 100 kHz,
3
4
5
2 V rms
60 60 60 MHz
33 33 33 MHz
0.005 0.005 0.005 %
SETTLING TIME
10 V Output Step ±15 V Supplies
Gain = –1, to 0.1%
Gain = –10, to 0.1%
2 V Output Step ± 5 V Supplies
Gain = –1, to 0.1%
Gain = –10, to 0.1%
5
6
5
6
100 100 100 ns
100 100 100 ns
110 110 110 ns
100 100 100 ns
–2–
REV. D
AD844
Model Conditions Min Typ Max Min Typ Max Min Typ Max Unit
AD844J/A AD844B AD844S
OUTPUT SLEW RATE Overdriven
Input 1200 2000 1200 2000 1200 2000 V/µs
FULL POWER BANDWIDTH
= 20 V p-p
V
OUT
= 2 V p-p
V
OUT
5
5
VS = ±15 V 20 20 20 MHz
VS = ±5 V 20 20 20 MHz
THD = 3%
OUTPUT CHARACTERISTICS
Voltage R
= 500 Ω 10 11 10 11 10 11 ± V
LOAD
Short Circuit Current 80 80 80 mA
T
MIN–TMAX
60 60 60 mA
Output Resistance Open Loop 15 15 15 Ω
POWER SUPPLY
Operating Range ±4.5 ± 18 ± 4.5 ±18 +4.5 ±18 V
Quiescent Current 6.5 7.5 6.5 7.5 6.5 7.5 mA
T
MIN–TMAX
NOTES
1
Rated performance after a 5 minute warmup at TA = 25°C.
2
Input signal 285 mV p-p carrier (40 IRE) riding on 0 mV to 642 mV (90 IRE) ramp. RL= 100 Ω; R1, R2 = 300 Ω.
3
Input signal 0 dBm, CL = 10 pF, RL = 500 Ω, R1 = 500 Ω, R2 = 500 Ω in Figure 2.
4
Input signal 0 dBm, CL =10 pF, RL = 500 Ω, R1 = 500 Ω, R2 = 50 Ω in Figure 2.
5
CL = 10 pF, RL = 500 Ω, R1 = 1 kΩ, R2 = 1 kΩ in Figure 2.
6
CL = 10 pF, RL = 500 Ω, R1 = 500 Ω, R2 = 50 Ω in Figure 2.
Specifications subject to change without notice. All min and max specifications are guaranteed.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Power Dissipation
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 W
1
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . ± V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Inverting Input Current
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
7.5 8.5 7.5 8.5 8.5 9.5 mA
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device at these or any other conditions above those
indicated in the operational sections of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect device
reliability.
S
2
8-Lead Plastic Package: θ
8-Lead Cerdip Package: θJA = 110°C/W
16-Lead SOIC Package: θJA = 100°C/W
= 90°C/W
JA
Transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C
Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . . 300°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 V
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimension shown in inches and (mm).
ORDERING GUIDE
Temperature Package
Model Range Option
*
AD844AN –40°C to +85°C N-8
AD844ACHIPS –40°C to +85°CDie
AD844AQ –40°C to +85°C Q-8
AD844BQ –40°C to +85°C Q-8
AD844JR-16 0°C to 70°C R-16
AD844JR-16-REEL 0°C to 70°C 13" Tape
and Reel
AD844JR-16-REEL7 0°C to 70°C 7" Tape
and Reel
AD844SCHIPS –55°C to +125°CDie
AD844SQ –55°C to +125°C Q-8
AD844SQ/883B –55°C to +125°C Q-8
5962-8964401PA –55°C to +125°C Q-8
*
N = Plastic DIP; Q = Cerdip; R = Small Outline IC (SOIC).
REV. D
–3–
AD844–Typical Characteristics
(TA = 25C and VS = 15 V, unless otherwise noted)
70
60
50
40
–3dB BANDWIDTH – MHz
30
05 20
10 15
SUPPLY VOLTAGE – V
TPC 1. –3 dB Bandwidth vs.
Supply Voltage R1 = R2 = 500
20
TA = 25C
15
10
5
Ω
–60
–70
HARMONIC DISTORTION – dB
–80
–90
–100
–110
–120
–130
1V rms
2ND HARMONIC
3RD HARMONIC
100 1k 100k
INPUT FREQUENCY – Hz
10k
TPC 2. Harmonic Distortion vs.
Frequency, R1 = R2 = 1 k
20
RL = 500
T
= 25C
A
15
10
5
5
4
3
2
TRANSRESISTANCE – M
1
0
–50 150
0 50 100
TEMPERATURE – C
R
=
L
RL = 500
RL = 50
TPC 3. Transresistance vs.
Ω
Temperature
10
9
8
7
VS = 15V
6
SUPPLY CURRENT – mA
5
V
S
= 5V
MAGNITUDE OF THE OUTPUT VOLTAGE – V
0
05 20
10 15
SUPPLY VOLTAGE – V
TPC 4. Noninverting Input Voltage
Swing vs. Supply Voltage
2
1
I
0
–1
INPUT BIAS CURRENT – A
–2
–50 150
0 50 100
TEMPERATURE – C
BP
I
BN
TPC 7. Inverting Input Bias Current (I
Bias Current (I
) and Noninverting Input
BN
) vs. Temperature
BP
MAGNITUDE OF THE OUTPUT VOLTAGE – V
0
05 20
10 15
SUPPLY VOLTAGE – V
TPC 5. Output Voltage Swing
vs. Supply Voltage
100
10
5V SUPPLIES
1
0.1
OUTPUT IMPEDANCE –
0.01
10k 100k 100M
1M 10M
FREQUENCY – Hz
TPC 8. Output Impedance vs.
Frequency, Gain = –1, R1 = R2 = 1 k
4
–60
0
–40 –20 40 60 80 100 120 140
20
TEMPERATURE – C
TPC 6. Quiescent Supply
Current vs. Temperature and
Supply Voltage
40
35
30
25
20
–3dB BANDWIDTH – MHz
15
10
–40 –20 40 60 80 100 120 140
–60
020
TEMPERATURE – C
VS = 15V
V
= 5V
S
TPC 9. –3 dB Bandwidth vs.
Ω
Temperature, Gain = –1,
R1 = R2 = 1 k
Ω
–4–
REV. 0
Inverting Gain-of-1 AC Characteristics
AD844
+V
S
–
AD844
+
0.22F
–V
4.7
R1
R
L
4.7
S
0.22F
R2
V
IN
TPC 10. Inverting Amplifier,
Gain of –1 (R1 = R2)
6
0
–6
V
OUT
C
L
GAIN – dB
–12
–18
–24
100k 1M 100M10M
FREQUENCY – Hz
R1 = R2 = 500
R1 = R2 = 1k
TPC 11. Gain vs. Frequency for
Gain = –1, R
= 500 Ω, CL = 0 pF
L
–180
–210
–240
–270
PHASE – Degrees
–300
–330
050
R1 = R2 = 1k
FREQUENCY – MHz
R1 = R2 = 500
25
TPC 12. Phase vs. Frequency
Gain = –1, R
= 500 Ω, CL = 0 pF
L
TPC 13. Large Signal Pulse
Response, Gain = –1, R1 = R2 = 1 k
Ω
Inverting Gain-of-10 AC Characteristics
26
+V
S
0.22F
50
V
IN
4.7
500
–
AD844
+
R
L
0.22F
4.7
–V
S
TPC 15. Gain of –10 Amplifier
V
OUT
C
L
20
14
GAIN – dB
8
2
–4
100k 1M 100M10M
FREQUENCY – Hz
TPC 16. Gain vs. Frequency,
Gain = –10
RL = 500
RL = 50
TPC 14. Small Signal Pulse
Response, Gain = –1, R1 = R2 = 1 k
–180
–210
–240
–270
PHASE – Degrees
–300
–330
050
R
= 50
L
FREQUENCY – MHz
TPC 17. Phase vs. Frequency,
Gain = –10
Ω
RL = 500
25
REV. D
–5–
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