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AD844
Service Manual
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Service Manual
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ANALOG DEVICES AD844 Service Manual

60 MHz, 2000 V/s
www.BDTIC.com/ADI
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 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

GENERAL 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 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 (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
= 500
L
Monolithic Op Amp
AD844

CONNECTION DIAGRAMS

8-Lead PDIP (N) and
CERDIP (Q) Packages
1
NULL
2
–IN
+IN
3
–V
4
S
(Not to Scale)
CERDIP
AD844
TOP VIEW
(Q) package. The AD844A is also available in an
8
NULL
7
+V
6
OUTPUT
5
TZ
S
OFFSETNULL
8-lead PDIP (N). The AD844S is specified over the perature 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
NC
8
(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
military tem-
REV. E
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. Trademarks and registered trademarks are the property of their respective companies.
AD844–SPECIFICATIONS
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(@ TA = 25C and VS = 15 V dc, unless otherwise noted.)
AD844J/AD844A AD844B AD844S
Model Conditions Min Typ Max Min Typ Max Min Typ Max Unit
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 Note 3 60 60 60 MHz Gain = –10 Note 4 33 33 33 MHz
TOTAL HARMOMIC DISTORTION f = 100 kHz,
2 V rms
5
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. E
AD844
www.BDTIC.com/ADI
Model Conditions Min Typ Max Min Typ Max Min Typ Max Unit
OUTPUT SLEW RATE Overdriven
Input 1200 2000 1200 2000 1200 2000 V/µs
FULL POWER BANDWIDTH
V
= 20 V p-p
OUT
= 2 V p-p
V
OUT
OUTPUT CHARACTERISTICS
Voltage R Short Circuit Current 80 80 80 mA T
MIN–TMAX
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 warm-up 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.
5
5
VS = ±15 V 20 20 20 MHz VS = ±5 V 20 20 20 MHz THD = 3%
= 500 Ω 10 11 10 11 10 11 ±V
LOAD
AD844J/AD844A AD844B AD844S
60 60 60 mA
7.5 8.5 7.5 8.5 8.5 9.5 mA
REV. E
–3–
AD844
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ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Power Dissipation
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 W
1
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . ± V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Inverting Input Current
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
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
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.
2
8-Lead PDIP Package: θ 8-Lead CERDIP Package: θJA = 110°C/W. 16-Lead SOIC Package: θJA = 100°C/W.
= 90°C/W.
JA

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°C13" Tape and Reel AD844JR-16-REEL7 0°C to 70°C7" 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 = PDIP, Q= CERDIP, R = Small Outline IC (SOIC).

METALLIZATION PHOTOGRAPH

Contact factory for latest dimensions.
Dimension shown in inches and (millimeters).
*
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 AD844 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.
–4–
REV. E
(TA = 25C and VS = 15 V, unless otherwise noted.)
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Typical Performance Characteristics–AD844
TPC 1. –3 dB Bandwidth vs. Supply Voltage, R1 = R2 = 500
20
T
= 25C
A
15
10
INPUT VOLTAGE – V
5
0
05 20
10 15
SUPPLY VOLTAGE – V
Ω
TPC 4. Noninverting Input Voltage Swing vs. Supply Voltage
TPC 2. Harmonic Distortion vs. Frequency, R1 = R2 = 1 k
20
RL = 500 T
= 25C
A
15
10
OUTPUT VOLTAGE – V
5
0
05 20
10 15
SUPPLY VOLTAGE – V
Ω
TPC 5. Output Voltage Swing vs. Supply Voltage
TPC 3. Transresistance vs. Temperature
TPC 6. Quiescent Supply Current vs. Temperature and Supply Voltage
TPC 7. Inverting Input Bias Cur­rent (IBN) and Noninverting Input Bias Current (IBP) vs. Temperature
REV. E
TPC 8. Output Impedance vs. Frequency, Gain = –1, R1 = R2 = 1 k
–5–
Ω
TPC 9. –3 dB Bandwidth vs. Temperature, Gain = –1, R1 = R2 = 1 k
Ω
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