参数资料
型号: AD817
厂商: Analog Devices, Inc.
英文描述: High Speed, Low Power Wide Supply Range Amplifier(高速,低功耗,宽电源范围放大器)
中文描述: 高速,低功耗,宽电源电压范围放大器(高速,低功耗,宽电源范围放大器)
文件页数: 10/12页
文件大小: 331K
代理商: AD817
REV. B
–10–
AD817
OFFSE T NULLING
T he 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. T he null range of the AD817 in this con-
figuration is
±
15 mV.
AD817 SE T T LING T IME
Settling time is comprised primarily of two regions. T he first is
the slew time in which the amplifier is overdriven, where the
output voltage rate of change is at its maximum. T he second is
the linear time period required for the amplifier to settle to
within a specified percent of the final value.
0.10
0.20
0.15
0.05
0.05
0
0
4
6
10
8
2
0
350
400
300
250
200
150
100
50
S
O
O
Figure 33. Settling Time in ns 0 V to +10 V
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). T he 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.
0.05
0.05
0
0.20
0.10
0.15
–10
–6
–4
0
–2
–8
0
350
400
300
250
200
150
100
50
S
O
O
Figure 34. Settling Time in ns 0 V to –10 V
AD829
100
0.47
μ
F
0.01
μ
F
+V
S
0.47
μ
F
0.01
μ
F
–V
S
SHORT, DIRECT
CONNECTION TO
TEKTRONIX TYPE 11402
OSCILLOSCOPE PREAMP
INPUT SECTION
SETTLING
OUTPUT
2
×
HP2835
ERROR AMPLIFIER
V
ERROR
OUTPUT
×
10
2
×
HP2835
1.9k
100
AD817
0.01
μ
F
+V
S
0.01
μ
F
2.2
μ
F
–V
S
2.2
μ
F
10pF
SCOPE PROBE
CAPACITANCE
TEKTRONIX P6201
FET PROBE TO
TEKTRONIX TYPE
11402
OSCILLOSCOPE
PREAMP INPUT
SECTION
500
5–18pF
DEVICE
UNDER
TEST
NOTE:
USE CIRCUIT BOARD
WITH GROUND PLANE
FALSE
SUMMING
NODE
NULL
ADJUST
1k
100
1k
50
COAX
CABLE
TTL LEVEL
SIGNAL
GENERATOR
50Hz
OUTPUT
7, 8
0 TO
±
10V
POWER
SUPPLY
EI&S
DL1A05GM
MERCURY RELAY
ERROR
SIGNAL
OUTPUT
500
50
6
3
2
4
15pF
1M
7
6
3
2
4
5
13
2
1, 14
DIGITAL
GROUND
ANALOG
GROUND
7
Figure 35. Settling Time Test Circuit
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