AD8139ACP-R2 datasheet(23/24 Pages) AD

23 / 24 page

AD8139

Rev. A | Page 23 of 24

Exposed Paddle (EP)

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

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

checked. From Figure 62, 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 SOIC-8 and LFCSP packages have an exposed paddle on

the underside of its body. In order to achieve the specified

thermal resistance, it must have a good thermal connection to one

of the PCB planes. The exposed paddle must be soldered to a pad

on top of the board that is connected to an inner plane with several

thermal vias.

AD8139

–

2.4V

2V p-p

61.9

Ω

VOCM

200

Ω

226

Ω

205

Ω

205

Ω

0.01

µF

0.01

µF

0.01

µF

AIN

GND C1

0.1

µF

VREF

0.1

µF

AVCC

DVCC

3.3V

AD6645

SIGNAL

SOURCE

Ω

Figure 62. AD8139 Driving AD6645, 14-Bit, 80 MSPS/105 MSPS A/D Converter

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