ADA4945-1ACPZ-R7 datasheet(41/57 Pages) AD

номер детали	ADA4945-1ACPZ-R7

подробное описание детали	High Speed, ±0.1 μV/˚C Offset Drift, Fully Differential ADC Driver

PDF	57 Pages

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производитель	AD [Analog Devices]

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41 / 57 page

Data Sheet

ADA4945-1

analog.com

Rev. A

41 of 57

TERMINOLOGY

Differential Voltage

Differential voltage is the difference between two node voltages. For example, the differential output voltage (or

equivalently, output differential mode voltage) is defined as

VOUT,dm = (V+OUT − V−OUT)

where V+OUT and V−OUT refer to the voltages at the +OUT and −OUT terminals with respect to a common reference.

Similarly, the differential input voltage is defined as

VIN,dm = (+DIN − (−DIN))

Common-Mode Voltage (CMV)

CMV is the average of two node voltages. The output common mode voltage is defined as

VOUT,cm= (V+OUT + V−OUT)/2

Similarly, the input common-mode voltage is defined as

VIN,cm = (+DIN + (−DIN))/2

Common-Mode Offset Voltage

Common-mode offset voltage is the difference between the voltage applied to the VOCM terminal and the common

mode of the output voltage.

VOS,cm = VOUT,cm − VOCM

Differential VOS, Differential CMRR, and VOCM CMRR

The differential mode and common-mode voltages each have their own error sources. The differential offset (VOS,dm)

is the voltage error between the +IN and −IN terminals of the amplifier. Differential CMRR reflects the change of VOS,

dm in response to changes to the common-mode voltage at +DIN and −DIN (see Figure 98).

CMRRDFF =

∆VIN,cm

∆VOS,dm

VOCM CMRR reflects the change of VOS, dm in response to changes to the common-mode voltage at the output

terminals.

CMRRV

OCM =

∆VOCM

∆VOS,dm

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