MAX410 Maxim, MAX410 Datasheet - Page 9

• Manufacturer Part Number: MAX410
• Description: The MAX410/MAX412/MAX414 single/dual/quad op amps set a new standard for noise performance in high-speed, low-voltage systems
• Manufacturer: Maxim

circuit shown in Figure 3. Figure 4 shows the frequency
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.
Figure 3. 0.1Hz to 10Hz Voltage Noise Test Circuit
Figure 4. 0.1Hz to 10Hz Voltage Noise Test Circuit, Frequency
Response
100
80
60
40
20
0
0.01
_______________________________________________________________________________________
0.1
FREQUENCY (Hz)
10Ω
Single/Dual/Quad, 28MHz, Low-Noise,
1
100kΩ
D.U.T
0.1µF
MAX410
MAX412
MAX414
10
+V
-V
Low-Voltage, Precision Op Amps
S
S
100
2kΩ
4.7µF
24.9kΩ
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
MAX410
n
100kΩ
0.1µF
no
n
p
VCL
p
= Input current-noise density at the frequency of
= Noninverting input effective series resistance
= Inverting input effective series resistance
and R
+V
-V
= Output voltage-noise density at the frequency of
S
S
= Closed-loop gain
i
n
=
n
include the resistances of the input driving
2kΩ
-23
e
4.7µF
no
J/K (Boltzman’s constant)
2
-
[
(R +R )(A
(A
22µF
n
VCL
TO SCOPE x1
R
IN
p
) (4kT)(R +R )
2
= 1MΩ
Current Noise Testing
110kΩ
VCL
)
n
p
]
A
/
Hz
VCL
9