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MCP6N16T-100E

Zero-Drift Instrumentation Amplifier

Microchip Technology 

MCP6N16

The nonlinearity specifications (INLCM and INLDM)

describe errors that are nonlinear functions of VCM and

VDM, respectively. They give the maximum excursion

from linear response over the entire common mode

and differential ranges.

The input bias current and offset current specifications

(IB and IOS), together with a circuit’s external input

resistances, give an additional DC error. Figure 4-3

shows the resistors that set the DC bias point.

IBP RIP

VIP

VIM

IBM RIM

VDD

U1

MCP6N16

VOUT

IBF

RF

VFG

RR

IBR

RG

VREF

FIGURE 4-3:

DC Bias Resistors.

The resistors at the main input (RIP and RIM) and its

input bias currents (IBP and IBM) give the following

changes in the INA’s bias voltages:

EQUATION 4-6:

VIP = –IBPRIP = –IB + IOS  2RIP

VIM = –IBMRIM = –IB – IOS  2RIM

VCM = VIP + VIM  2

= –IBRIP + RIM  2–IOSRIP – RIM  4

VDM = VIP – VIM

= –IBRIP – RIM – IOSRIP + RIM  2

VOUT = GDMVDM + VCM  CMRR

Where:

CMRR is in units of V/V

The change in VCM (∆VCM) can affect the input range,

for large RIP or RIM. The best design results when RIP

and RIM are equal and small:

EQUATION 4-7:

VOUT  GDMVDM

 GDM2IBRTOL – IOSRIP

Where:

RIP = RIM

RTOL = tolerance of RIP and RIM

The resistors at the feedback input (RR, RF and RG)

and its input bias currents (IBR and IBF) give the

following changes in the INA’s bias voltages:

EQUATION 4-8:

VREF = –IBRRR = –IB2 + IOS2  2RR

VFG  VREF due to high AOL

VOUT  IB2RF – GDMRR + IOS2RF + GDMRR  2

Where:

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The change in VREF (∆VREF) can affect the input range,

for large RR or RF. The best design results when

GDMRR and RF are equal (i.e., RR = RF||RG) and small:

EQUATION 4-9:

VOUT  2IB2RTOL + IOS2RF

Where:

GDMRR = RF

RTOL = tolerance of RR, RF and RG

4.1.4 AC PERFORMANCE

The bandwidth of these amplifiers depends on GDM

and GMIN:

EQUATION 4-10:

fBW  fGBWP  GDM

 0.50 MHzGMIN  GDM,

 0.35 MHzGMIN  GDM,

Where:

GMIN = 1, 10

GMIN = 100

fBW = -3 dB bandwidth

fGBWP = Gain-Bandwidth product

The bandwidth at the maximum output swing is called

the Full Power Bandwidth (fFPBW). It is limited by the

Slew Rate (SR) for many amplifiers, but is close to fBW

for these parts:

EQUATION 4-11:

Where:

fFPBW  SR  VO

 fBW , for these parts

VO = Maximum output voltage swing

 VOH – VOL

DS20005318A-page 38

 2014 Microchip Technology Inc.

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