AD847 Analog Devices, AD847 Datasheet - Page 11

• Manufacturer Part Number: AD847
• Description: High Speed, Low Power Monolithic Op Amp
• Manufacturer: Analog Devices

Specifications of AD847

• -3db Bandwidth: 50MHz
• Slew Rate: 300V/µs
• Vos: 500µV
• Ib: 3.3µA
• # Opamps Per Pkg: 1
• Input Noise (nv/rthz): 15nV/rtHz
• Vcc-vee: 9V to 36V
• Isy Per Amplifier: 4.8mA
• Packages: DIP,SOIC

REV. F
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.
+V
–V
IN
IN
BANDWIDTH, SETTLING TIME AND TOTAL HARMONIC DISTORTION VS. GAIN
R
G
3
2
6
5
Figure 26. A High Speed In-Amp Circuit for Data Acquisition
A1
A2
COMM
AD827
GAIN R
1
2
10
100
AD827
1k
1k
+15V
–15V
1/2
1/2
7
1
OPEN
2k
226
20
G
5pF
2k
2k
10 F
10 F
C
(pF)
2–8
2–8
2–8
2–8
ADJ
SMALL
SIGNAL
BANDWIDTH
16.1MHz
14.7MHz
4.5MHz
660kHz
0.1 F
0.1 F
1.87k
DC CMR
ADJUST
200
AC CMR ADJUST
SETTLING TIME
2
3
2–8pF
A3
2k
+V
–V
AD847
–11–
S
S
6
CIRCUIT GAIN =
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.
AMPLIFIER
SETTLING
TIME
TO 0.1%
200ns
200ns
370ns
2.5 s
V
1 F
EACH
1 F
OUT
0.1 F
0.1 F
R
2k
2000
L
THD + NOISE
BELOW INPUT
LEVEL
@ 10kHz
82dB
82dB
81dB
71dB
R
G
PIN 4
AD847 & AD827
PIN 7 AD847,
PIN 8 AD827
+ 1
INPUT
FREQUENCY
100Hz
1kHz
10kHz
100kHz
1MHz
CMRR
88.3dB
87.4dB
86.2dB
67.4dB
47.1dB
AD847