op497fy Analog Devices, Inc., op497fy Datasheet - Page 10

• Manufacturer Part Number: op497fy
• Description: Precision Picoampere Input Current Quad Operational Amplifier
• Manufacturer: Analog Devices, Inc.

OP497
Figure 12 and Table I show the node and net list for a SPICE
macro-model of the OP497. The model is a simplified version of
the actual device and simulates important dc parameters such as
V
rate, gain and phase response, and CMR change with frequency
are also simulated by the model.
OP497 SPICE MACRO-MODEL
OS
, I
OS
, I
B
, A
VO
, CMR, V
O
, and I
+IN
–IN
2
1
ECM
SY
R
R
IN2
IN1
15
C
. AC parameters such as slew
IN
20
98
RCM1
CCM
RCM2
I
I
SY
OS
8
7
R16
21
R17
16
D9
ENZ
R1
R2
17
E
D7
– +
OS
RNZ1
D1
CNZ
RNZ2
25 26
G4
18
9
G2
D8
G5
D2
R5
R3
10
D5
D6
5
The model uses typical parameters for the OP497. The poles and
zeros in the model were determined from the actual open and
closed-loop gain and phase response of the OP497. In this way,
the model presents an accurate ac representation of the actual
device. The model assumes an ambient temperature of 25°C.
D10
Q1
99
19
I
1
23
24
50
R10
C2
99
50
Q2
+
– +
V3
V4
R4
6
11
R6
–
C5
22
98
G2
G6
G7
G1
E
REF
R18
R19
20
R7
L1
R15
12
V
27
V1
V2
O
C3
13
14
C5
D3
D4