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PDF AD817 Data sheet ( Hoja de datos )
| Número de pieza | AD817 | |
| Descripción | High Speed/ Low Power Wide Supply Range Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
High Speed, Low Power
Wide Supply Range Amplifier
FEATURES
Low Cost
High Speed
50 MHz Unity Gain Bandwidth
350 V/s Slew Rate
45 ns Settling Time to 0.1% (10 V Step)
Flexible Power Supply
Specified for Single (+5 V) and
Dual (؎5 V to ؎15 V) Power Supplies
Low Power: 7.5 mA max Supply Current
High Output Drive Capability
Drives Unlimited Capacitive Load
50 mA Minimum Output Current
Excellent Video Performance
70 MHz 0.1 dB Bandwidth (Gain = +1)
0.04% & 0.08؇ Differential Gain & Phase Errors
@ 3.58 MHz
Available in 8-Pin SOIC and 8-Pin Plastic Mini-DIP
PRODUCT DESCRIPTION
The AD817 is a low cost, low power, single/dual supply, high
speed op amp which is ideally suited for a broad spectrum of
signal conditioning and data acquisition applications. This
breakthrough product also features high output current drive
capability and the ability to drive an unlimited capacitive load
while still maintaining excellent signal integrity.
The 50 MHz unity gain bandwidth, 350 V/µs slew rate and set-
tling time of 45 ns (0.1%) make possible the processing of high
speed signals common to video and imaging systems. Further-
more, professional video performance is attained by offering dif-
ferential gain & phase errors of 0.04% & 0.08° @ 3.58 MHz
and 0.1 dB flatness to 70 MHz (gain = +1).
AD817
CONNECTION DIAGRAM
8-Pin Plastic Mini-DIP (N) and
SOIC (R) Packages
NULL 1
–IN 2
+IN 3
AD817
8 NULL
7 +VS
6 OUTPUT
–VS 4
TOP VIEW
5 NC
NC = NO CONNECT
The AD817 is fully specified for operation with a single +5 V
power supply and with dual supplies from ± 5 V to ± 15 V. This
power supply flexibility, coupled with a very low supply current
of 7.5 mA and excellent ac characteristics under all power sup-
ply conditions, make the AD817 the ideal choice for many de-
manding yet power sensitive applications.
In applications such as ADC buffers and line drivers the AD817
simplifies the design task with its unique combination of a
50 mA minimum output current and the ability to drive
unlimited capacitive loads.
The AD817 is available in 8-pin plastic mini-DIP and SOIC
packages.
ORDERING GUIDE
Model
Temperature Package
Range
Description
Package
Option
AD817AN –40°C to +85°C 8-Pin Plastic DIP N-8
AD817AR –40°C to +85°C 8-Pin Plastic SOIC R-8
HP
PULSE
GENERATOR
VIN
1kΩ
50Ω
1kΩ
+VS
27
AD817
34
3.3µF
0.01µF
VOUT
6
0.01µF
3.3µF
–VS
CL
1000pF
TEKTRONIX
P6201 FET
PROBE
5V
100
90
10
0%
500ns
100pF
LOAD
1000pF
LOAD
AD817 Driving a Large Capacitive Load
REV. B
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.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
7
6
5
4
3
2
1
–60 –40 –20
0 20 40 60 80 100 120 140
TEMPERATURE – °C
Figure 7. Input Bias Current vs. Temperature
130
110
SOURCE CURRENT
90
SINK CURRENT
70
50
30
–60 –40 –20
0 20 40 60 80 100 120 140
TEMPERATURE – °C
Figure 8. Short Circuit Current vs. Temperature
100
80 80
PHASE MARGIN
60 60
GAIN BANDWIDTH
40 40
20
–60 –40 –20
0 20 40 60 80
TEMPERATURE – °C
20
100 120 140
Figure 9. Unity Gain Bandwidth and Phase Margin
vs. Temperature
AD817
100 +100
PHASE ±5V OR
±15V SUPPLIES
80 +80
GAIN ±15V SUPPLIES
60
+60
40
GAIN ±5V SUPPLIES
20
+40
+20
0
–20
1k
RL = 1kΩ
10k 100k 1M 10M
FREQUENCY – Hz
100M
0
1G
Figure 10. Open-Loop Gain and Phase Margin
vs. Frequency
7
±15V
6
5
±5V
4
3
2
1
100 1k 10k
LOAD RESISTANCE – Ohms
Figure 11. Open Loop Gain vs. Load Resistance
100
90
80
POSITIVE
70 SUPPLY
60
50
NEGATIVE
SUPPLY
40
30
20
10
100 1k 10k 100k 1M 10M 100M
FREQUENCY – Hz
Figure 12. Power Supply Rejection vs. Frequency
REV. B
–5–
5 Page 
AD817
A HIGH PERFORMANCE ADC INPUT BUFFER
High performance analog to digital converters (ADCs) require
input buffers with correspondingly high bandwidths and very
low levels of distortion. Typical requirements include distortion
levels of –60 dB to –70 dB for a 1 volt p-p signal and band-
widths of 10 MHz or more. In addition, an ADC buffer may
need to drive very large capacitive loads.
The circuit of Figure 36 is useful for driving high speed convert-
ers such as the differential input of the AD733, 10-bit ADC.
This circuit may be used with other converters with only minor
modifications. Using the AD817 provides the user with the op-
tion of either operating the buffer in differential mode or from a
single +5 volt supply. Operating from a +5 volt power supply
helps to avoid overdriving the ADC—a common problem with
buffers operating at higher supply voltages.
SINGLE SUPPLY OPERATION
Another exciting feature of the AD817 is its ability to perform
well in a single supply configuration. The AD817 is ideally
suited for applications that require low power dissipation and
high output current and those which need to drive large capaci-
tive loads, such as high speed buffering and instrumentation.
Referring to Figure 37, careful consideration should be given to
the proper selection of component values. The choices for this
particular circuit are: R1+ R3//R2 combine with C1 to form a
low frequency corner of approximately 300 Hz.
+VS
R3
1kΩ
C2
0.1µ F
C1
0.1µF
VIN
R1
9kΩ
R2
10kΩ
3.3µF
0.01µF
SELECT C1, R1, R2 & R3
FOR DESIRED LOW
FREQUENCY CORNER.
(R2 = R1 + R3)
7
2
AD817 6
3
4
RL
150Ω
C3
0.1µF
COUT
VOUT
CL
200pF
Figure 37. Single Supply Amplifier Configuration
Combining R3 with C2 forms a low-pass filter with a corner
frequency of 1.5 kHz. This is needed to maintain amplifier
PSRR, since the supply is connected to VIN through the input
divider. The values for RL and CL were chosen to demonstrate
the AD817’s exceptional output drive capability. In this con-
figuration, the output is centered around 2.5 V. In order to
eliminate the static dc current associated with this level, C3 was
inserted in series with RL.
1kΩ
1kΩ
VIN
500mVp-p
MAX
50Ω
COAX
CABLE
52.5Ω
+VS
0.1µF
27
AD817
6
3 4 0.1µF
–VS
+VS
0.1µF
26 VINA
AD773
10-BIT
18MHz
ADC
37
AD817 6
1kΩ
2 4 0.1µF
27 VINB
+5V
COMMON
–5V
100µF
25V
100µF
25V
+VS
–VS
–VS
1kΩ
ADREF43
VOLTAGE
REFERENCE
+2.5V
Figure 36. A Differential Input Buffer for High Bandwidth ADCs
REV. B
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD817.PDF ] | |
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