5962-8964701PA Ver la hoja de datos (PDF) - Analog Devices
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5962-8964701PA Datasheet PDF : 12 Pages
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AD847
A High Speed, Three Op-Amp In-Amp
The circuit of Figure 26 lends itself well to CCD imaging and
other video speed applications. It uses two high speed CB pro-
cess op-amps: Amplifier A3, the output amplifier, is an AD847.
The input amplifier (A1 and A2) is an AD827, which is a dual
version of the AD847. This circuit has the optional flexibility of
both dc and ac trims for common-mode rejection, plus the abil-
ity to adjust for minimum settling time.
+15V
COMM
–15V
10µF
10µF
+VS
0.1µF
0.1µF
–VS
EACH
AMPLIFIER
1µF
0.1µF
PIN 7 AD847,
PIN 8 AD827
1µF
0.1µF
PIN 4
AD847 & AD827
–VIN
+VIN
1/2
AD827
3
A1 1
2
1kΩ
2kΩ
RG
2kΩ
1kΩ
5pF
6
A2 7
5
1/2
AD827
2–8pF
SETTLING TIME
AC CMR ADJUST
2kΩ
2
VOUT
A3 6
3
AD847
RL
2kΩ
1.87kΩ
INPUT
FREQUENCY
100Hz
1kHz
10kHz
100kHz
1MHz
CMRR
88.3dB
87.4dB
86.2dB
67.4dB
47.1dB
DC CMR
ADJUST
200Ω
CIRCUIT GAIN = 2000Ω + 1
RG
BANDWIDTH, SETTLING TIME AND TOTAL HARMONIC DISTORTION VS. GAIN
GAIN
1
2
10
100
RG
OPEN
2kΩ
226Ω
20Ω
SMALL
CADJ SIGNAL
(pF) BANDWIDTH
2–8 16.1MHz
2–8 14.7MHz
2–8 4.5MHz
2–8 660kHz
SETTLING
TIME
TO 0.1%
200ns
200ns
370ns
2.5µs
THD + NOISE
BELOW INPUT
LEVEL
@ 10kHz
82dB
82dB
81dB
71dB
Figure 26. A High Speed In-Amp Circuit for Data Acquisition
REV. F
–11–
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