AD827JN Analog Devices Inc, AD827JN Datasheet - Page 7

• Manufacturer Part Number: AD827JN
• Description: IC OPAMP GP 50MHZ DUAL LP 8DIP
• Manufacturer: Analog Devices Inc

Specifications of AD827JN

• Slew Rate: 300 V/µs
• Mounting Type: Through Hole
• Rohs Status: RoHS non-compliant
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Gain Bandwidth Product: 50MHz
• Current - Input Bias: 3.3µA
• Voltage - Input Offset: 500µV
• Current - Supply: 10.5mA
• Current - Output / Channel: 32mA
• Voltage - Supply, Single/dual (±): ±4.5 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• No. Of Amplifiers: 2
• Bandwidth: 50MHz
• No. Of Pins: 8
• Operating Temperature Range: 0°C To +70°C
• Settling Time: 120ns
• Operating Temperature Max: 70°C
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

REV. C
VIDEO LINE DRIVER
The AD827 functions very well as a low cost, high speed line
driver for either terminated or unterminated cables. Figure 23
shows the AD827 driving a doubly terminated cable in a
follower configuration.
The termination resistor, R
characteristic impedance) minimizes reflections from the far end
of the cable. While operating from ± 5 V supplies, the AD827
maintains a typical slew rate of 200 V/µs, which means it can
drive a ± 1 V, 30 MHz signal into a terminated cable.
V
0 dB or ± 500 mV Step ± 15
0 dB or ± 500 mV Step ± 15
0 dB or ± 500 mV Step ± 15
0 dB or ± 500 mV Step ± 5
0 dB or ± 500 mV Step ± 5
0 dB or ± 500 mV Step ± 5
*–3 dB bandwidth numbers are for the 0 dBm signal input. Overshoot numbers
A back-termination resistor (R
impedance of the cable) may be placed between the AD827
output and the cable input, in order to damp any reflected
signals caused by a mismatch between R
characteristic impedance. This will result in a flatter frequency
response, although this requires that the op amp supply ± 2 V to
the output in order to achieve a ± 1 V swing at resistor R
are the percent overshoot of the 1 V step input.
IN
*
Table I. Video Line Driver Performance Summary
V
IN
Figure 23. A Video Line Driver
50Ω
AD827
V
1/2
–V
+V
SUPPLY
T
S
S
, (when equal to the cable’s
BT
C
C
0.1 µF
, also equal to the characteristic
0.1 µF
C
20 pF
15 pF
0 pF
20 pF
15 pF
0 pF
C
500Ω
500Ω
R
T
50Ω
BT
and the cable’s
–3 dB B
23 MHz
21 MHz
13 MHz
18 MHz
16 MHz
11 MHz
50Ω
R
T
W
V
T
OUT
.
Over-
shoot
4%
0%
0%
2%
0%
0%
–7–
A HIGH SPEED THREE OP AMP INSTRUMENTATION
AMPLIFIER CIRCUIT
The instrumentation amplifier circuit shown in Figure 24 can
provide a range of gains. Table II details performance.
+V
Figure 24. A High Bandwidth Three Op Amp
Instrumentation Amplifier
IN
–V
IN
Table II. Performance Specifications for the
Three Op Amp Instrumentation Amplifier
Gain
1
2
10
100
R
G
3
2
6
5
BANDWIDTH
+
+
AD827
–
AD827
–
TRIM FOR
OPTIMUM
7 – 15 pF
1/2
1/2
+V
1kΩ
1kΩ
S
4
–V
8
0.1µF
0.1µF
S
1
7
R
Open
2 k
226 Ω
20 Ω
G
NOTE: PINOUT SHOWN IS FOR MINIDIP PACKAGE
2kΩ
2kΩ
3pF
Small Signal
Bandwidth
@ 1 V p-p Output
16.1 MHz
14.7 MHz
4.9 MHz
660 kHz
CIRCUIT GAIN =
2kΩ
2
3
TRIM FOR BEST
SETTLING TIME
+V
+
–
AD847
–V
S
7
2 – 8pF
S
4
2kΩ
0.1µF
0.1µF
6
2000
R
AD827
G
+ 1
2kΩ
R
L
V
OUT