OPA2810 Datasheet, PDF (18/26 Pages) Texas Instruments – OPA2810 Dual High-Performance, Low-Power, Wide Supply Range, Rail-to-Rail Input/Output FET-Input Operational Amplifier

OPA2810
SBOS789 – AUGUST 2017
Application Information (continued)
www.ti.com
VS+ = 5V
+
EO
Case1: 200
RS
±
Case2: 2 k
VS- = -5V
RG
RF
Case1: 250
Case2: 2.5 k
Case1: 1 k
Case2: 10 k
Figure 5. Comparing Noise Contributors for Two Cases With the Amplifier in a Noninverting Gain of 5
V/V
Table 2. Comparing Noise Contributions for the Circuit in Figure 5
Noise
Source
Output
Noise
Equation
Source
resistor, R_S
Gain resistor,
R_G
Feedback
resistor, R_F
Amplifier
voltage
noise, E_NI
Inverting
current
noise, I_BI
Noninverting
current
noise, I_BN
E_RS
(1+R_F/R_G)
E_RG
(R_F/R_G)
E_RF
E_NI
(1+R_F/R_G)
I_BI
(R_F||R_G)
I_BNR_S
(1+R_F/R_G)
Noise
Source
Value
1.82
nV/√Hz
2.04
nV/√Hz
4.07
nV/√Hz
5.7
nV/√Hz
0.7
fA/√Hz
0.7
fA/√Hz
Case1
Voltage
Noise
Contribution
(nV/√Hz)
Noise Power
Contribution
(nV²/Hz)
Contribution
(%)
9.1
82.81
8.47
8.16
66.59
6.81
4.07
16.57
1.69
28.5
812.25
83.03
0.7E-3
-
-
0.14E-3
-
-
Noise
Source
Value
5.76
nV/√Hz
6.44
nV/√Hz
12.87
nV/√Hz
5.7
nV/√Hz
0.7
fA/√Hz
0.7
fA/√Hz
Case2
Voltage
Noise
Contribution
(nV/√Hz)
Noise Power
Contribution
(nV²/Hz)
Contribution
(%)
28.8
829.44
33.57
25.76
663.58
26.86
12.87
165.64
6.70
28.5
812.25
32.87
7E-3
-
-
1.4E-3
-
18
Submit Documentation Feedback
Product Folder Links: OPA2810
Copyright © 2017, Texas Instruments Incorporated