AD817 查看數據表（PDF） - Analog Devices
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AD817 Datasheet PDF : 14 Pages
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AD817
OFFSET NULLING
The input offset voltage of the AD817 is inherently very low.
However, if additional nulling is required, the circuit shown in
Figure 32 can be used. The null range of the AD817 in this con-
figuration is ± 15 mV.
AD817 SETTLING TIME
Settling time is comprised primarily of two regions. The first is
the slew time in which the amplifier is overdriven, where the
output voltage rate of change is at its maximum. The second is
the linear time period required for the amplifier to settle to
within a specified percent of the final value.
10
8
6
4
2
0
0.05
0
0.05
0.10
0.15
0.20
0 50 100 150 200 250 300 350 400
Measuring the rapid settling time of AD817 (45 ns to 0.1% and
70 ns to 0.01%–10 V step) requires applying an input pulse with
a very fast edge and an extremely flat top. With the AD817 con-
figured in a gain of –1, a clamped false summing junction re-
sponds when the output error is within the sum of two diode
voltages (ª1 volt). The signal is then amplified 20 times by a
clamped amplifier whose output is connected directly to a sam-
pling oscilloscope. Figures 33 and 34 show the settling time of
the AD817, with a 10 volt step applied.
0
–2
–4
–6
–8
–10
0.20
0.15
0.10
0.05
0
0.05
0 50 100 150 200 250 300 350 400
Figure 34. Settling Time in ns 0 V to –10 V
Figure 33. Settling Time in ns 0 V to +10 V
ERROR
SIGNAL
OUTPUT
2×
HP2835
ERROR AMPLIFIER
VERROR OUTPUT × 10
2×
HP2835
3
5
AD829
2
0.01µF
4
7
6
0.47µF
0.01µF
0.47µF
–VS +VS
100Ω
1.9kΩ
1MΩ
15pF
100Ω
SETTLING
OUTPUT
SHORT, DIRECT
CONNECTION TO
TEKTRONIX TYPE 11402
OSCILLOSCOPE PREAMP
INPUT SECTION
0 TO ±10V
POWER
SUPPLY
EI&S
DL1A05GM
MERCURY RELAY
7, 8
2
NULL
ADJUST
FALSE
SUMMING
NODE
1kΩ
100Ω 500Ω 1kΩ
TTL LEVEL
SIGNAL
GENERATOR
50Hz
OUTPUT
DIGITAL
GROUND
ANALOG
GROUND
13
1, 14
50Ω
COAX
CABLE
500Ω
50Ω
2.2µF
5–18pF
2
AD817 6
3
7
4
2.2µF
0.01µF +VS
–VS
NOTE:
USE CIRCUIT BOARD
WITH GROUND PLANE
DEVICE
UNDER
TEST
0.01µF
10pF
SCOPE PROBE
CAPACITANCE
TEKTRONIX P6201
FET PROBE TO
TEKTRONIX TYPE
11402
OSCILLOSCOPE
PREAMP INPUT
SECTION
Figure 35. Settling Time Test Circuit
–10–
REV. B
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