AD8139ACP-R2 datasheet(23/24 Pages) AD

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AD8139

Rev. B | Page 23 of 24

Exposed Paddle (EP)

Because this is a single-ended-to-differential application on a

single supply, the input common-mode voltage swing must be

checked. From Figure 64, β = 0.52, VOCM = 2.4 V, and VICM is

1.1 V p-p swinging about ground. Using Equation 16, VACM is

calculated to be 0.53 V p-p swinging about a baseline of 1.25 V,

and the minimum negative excursion is approximately 1 V.

The 8-lead SOIC and the 8-lead LFCSP have an exposed paddle

on the bottom of the package. To achieve the specified thermal

resistance, the exposed paddle must be soldered to one of the

PCB planes. The exposed paddle mounting pad should contain

several thermal vias within it to ensure a low thermal path to

the plane.

AD8139

–

2.4V

2V p-p

61.9Ω

VOCM

200Ω

226Ω

205Ω

25Ω

0.01µF

AIN

GND C1

0.1µF

VREF

0.1µF

AVCC

DVCC

3.3V

AD6645

SIGNAL

SOURCE

50Ω

Figure 64. AD8139 Driving AD6645, 14-Bit, 80 MSPS/105 MSPS ADC

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