MAX412CSA-T Maxim Integrated Products, MAX412CSA-T Datasheet - Page 8

• Manufacturer Part Number: MAX412CSA-T
• Description: Op Amps Dual 28MHz Low-V Low-Noise Precision
• Manufacturer: Maxim Integrated Products

Specifications of MAX412CSA-T

• Number Of Channels: 2
• Voltage Gain Db: 122 dB
• Common Mode Rejection Ratio (min): 115 dB
• Input Offset Voltage: 0.25 mV
• Operating Supply Voltage: 5 V or 9 V
• Supply Current: 5.4 mA
• Maximum Power Dissipation: 471 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8 Narrow
• Maximum Dual Supply Voltage: +/- 5.25 V
• Minimum Operating Temperature: 0 C

circuit shown in
response of the circuit. The test time for the 0.1Hz to
10Hz noise measurement should be limited to 10 sec-
onds, which has the effect of adding a second zero to
the test circuit, providing increased attenuation for fre-
quencies below 0.1Hz.
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
Figure 3. 0.1Hz to 10Hz Voltage Noise Test Circuit
Figure 4. 0.1Hz to 10Hz Voltage Noise Test Circuit, Frequency
Response
8
_______________________________________________________________________________________
100
80
60
40
20
0
0.01
Figure 3. Figure 4
0.1
10Ω
FREQUENCY (Hz)
1
100kΩ
D.U.T
0.1µF
MAX410
MAX412
MAX414
shows the frequency
+V
-V
10
S
S
100
2kΩ
4.7µF
24.9kΩ
MAX410
100kΩ
The current-noise density can be calculated, once the
value of the input-referred noise is determined, by
using the standard expression given below:
where:
R
R
e
interest (V/√Hz)
i
interest (A/√Hz)
A
T = Ambient temperature in Kelvin (K)
k = 1.38 x 10
R
source(s), if any.
If the Quan Tech model 5173 is used, then the A
terms in the numerator and denominator of the equation
given above should be eliminated because the Quan
0.1µF
n
no
n
p
VCL
p
= Noninverting input effective series resistance
= Input current-noise density at the frequency of
+V
-V
= Inverting input effective series resistance
and R
= Output voltage-noise density at the frequency of
S
S
= Closed-loop gain
i
n
=
n
2kΩ
include the resistances of the input driving
4.7µF
e
-23
no
2
J/K (Boltzman’s constant)
-
[
(R +R )(A
(A
22µF
n
VCL
TO SCOPE x1
R
IN
p
) (4kT)(R +R )
= 1MΩ
2
Current Noise Testing
110kΩ
VCL
)
n
p
]
A
/
Hz
VCL