MCP6D11 datasheet(36/60 Pages) MICROCHIP

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MCP6D11

DS20006162A-page 36

 2019 Microchip Technology Inc.

FIGURE 5-2:

Differential I/O Amplifier in Differential Configuration with Input Termination.

The DC biasing levels are determined as described in

Section 4.2 “Terminology and Definitions”. For a

true differential input, the common-mode voltages on

the summing junction inputs of the amplifier remain

fixed and do not move with the input signal (unlike the

single-ended input configurations where the input com-

mon-mode voltages do vary with the input signal). For

the AC coupled configuration the VOCM voltage also is

the input biasing voltage since there is no DC current

path through the feedback and gain resistors. In either

case, setting the VOCM voltage to a mid-supply value,

which is the default value if this pin is not externally

driven, assures symmetry and therefore maximizes the

achievable output swing.

5.1.2

INTERFACING TO A

SINGLE-ENDED SOURCE

If the source is single-ended and referenced to ground,

the differential I/O amplifier can be used to convert a

single-ended input signal into a differential output

signal while also providing a DC level shift; Figure 5-3

shows the basic circuit for this configuration. Again, VS

is the input source with the associated source

impedance ZSource =RS.

FIGURE 5-3:

Differential I/O Amplifier Driven by a Single-Ended Source with DC-Coupling.

MCP6D11

RF1

RF2

RG2

RG1

VIN-

VIN+

VOCM

VOUT+

VOUT-

VSDiff

RS1

ZIN_Amp

RS2

MCP6D11

RF1

RF2

RG2

RG1

VIN-

VIN+

VOCM

VOUT+

VOUT-

ZSource

ZIN_Amp

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