ADS6445 datasheet(67/75 Pages) STMICROELECTRONICS

No. de pieza	ADS6445

Descripción Electrónicos	QUAD CHANNEL, 14-BIT, 125/105/80/65 MSPS ADC WITH SERIAL LVDS OUTPUTS

PDF	75 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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BOARD DESIGN CONSIDERATIONS

Grounding

Supply Decoupling

Exposed Thermal Pad

ADS6445, ADS6444

ADS6443, ADS6442

SLAS531 – MAY 2007

A single ground plane is sufficient to give optimum performance, provided the analog, digital and clock sections

of the board are cleanly partitioned. Refer to the EVM User Guide (SLAU196) for board layout schemes.

As the ADS644X already includes internal decoupling, minimal external decoupling can be used without loss in

performance. Note that the decoupling capacitors can help to filter external power supply noise, so the optimum

number of decoupling capacitors would depend on actual application.

It is recommended to use separate supplies for the analog and digital supply pins to isolate digital switching

noise from sensitive analog circuitry. In case only a single 3.3-V supply is available, it should be routed first to

AVDD. It can then be tapped and isolated with a ferrite bead (or inductor) with decoupling capacitor, before

being routed to LVDD.

It is necessary to solder the exposed pad at the bottom of the package to a ground plane for best thermal

performance. For detailed information, see application notes QFN Layout Guidelines (SLOA122A) and

QFN/SON PCB Attachment (SLUA271A).

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ADS6445 Datasheet(PDF) 67 Page - STMicroelectronics