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MN2310H/B

Precision, Low-Noise JFET Instrumentation Amplifiers

Micro Networks 

MN2310 Series

Low Noise JFET

Instrumentation Amplifiers

The n-type JFET front end in the MN2310 Series

Low Noise Instrumentation Amplifiers produces

exceptionally low 1/f noise. A typical noise density

of the E parameter of the MN2310 is shown below.

n

1

-140

-150

MN2310 1/f Spectral Density

10

100

1000

10000

Gain

20dB per

Octave

f 3dB

Frequency

-160

-170

-180

Frequency

High CMR Amplifier - The MN2310 Series is

shown below connected as a high-CMR ac ampli-

fier. The ac configuration uses a single bypass

capacitor (Cext) to set the low frequency 3dB roll-

off point. The low frequency roll-off as a function

of the value of Cext is given below and depicted in

the following figure.

Adjusting Device Gain - The gain of the MN2310

Series Amplifiers is predetermined by three resistors,

two of which are laser trimmed thin film resistor

networks. However, access to the gain setting resis-

tors (R7 and R9) for the MN2310 Series is provided

for user-defined gains via external resistors. Resis-

tors R7 and R9 are internal to the MN2310 Series

amplifiers and have values as follows:

Device

MN2310

MN2311

MN2312

Fixed Gain

30dB

40dB

50dB

R7(kΩ) R9(Ω)

1.42 46

4.59 46

14.50 46

F

3dB

=

1/2π

RC

where

R

=

46Ω

Gain Formula:

+V Supply

R/2

40

0.1 uF

Gain (dB) = 20 Log (R7 / Req + 0.5)

where Req = R9 // Rext for an increase in gain or

where Req = R9 + Rext to decrease gain.

+

V/2

1

-

+

V/2

Cext

MN2310

44

-

2

14

41

30

R/2

0.1 uF

,,,,,,,,,,,,,, -V Supply

324 Clark St., Worcester, MA 01606

Tel. (508) 852-5400 • FAX (508) 853-8296

E-Mail – sales@mnc.com

Web Site – http://www.mnc.com

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