Rainbow-electronics MAX107 Manual do Utilizador descarregar pdf (Página 17)

capacitor, to filter power supply noise, in parallel with a

0.1µF capacitor. A combination of 0.01µF in parallel

with high quality 47pF ceramic chip capacitor located

very close to the MAX107 device filters high frequency

noise. A properly designed PC board (see MAX105EV

Kit data sheet) allows the user to connect all analog

supplies and all digital supplies together thereby

requiring only two separate power sources. Decoupling

, AV

I, AV

Q and AV

R with ferrite-bead

suppressors prevents further crosstalk between the

individual analog supply pins

Thermal Management

The MAX107 is designed for a thermally enhanced 80-

pin TQFP package, providing greater design flexibility,

increased thermal efficiency and a low thermal junc-

MAX107

Dual, 6-Bit, 400Msps ADC with On-Chip,

Wideband Input Amplifier

______________________________________________________________________________________ 17

AGNDR

AGND

AGNDI

AGNDQ

AGND

AGNDQ

AGNDI

AGNDR

PC BOARD AV

PC BOARD OV

PC BOARD AGND FERRITE-BEAD

SUPPRESSORS

PC BOARD OGND

RAV

OGNDQ

OGNDI

I, OV

OGNDQ

OGNDI

NOTE:

LOCATE ALL 47pF AND 10nF CAPACITORS, WHICH DECOUPLE AV

I, AV

Q, AV

R, OV

I, AND OV

Q AS CLOSE

AS POSSIBLE TO THE CHIP. IT IS ALSO RECOMMENDED TO CONNECT ALL ANALOG GROUND CONNECTIONS TO A COMMON ANALOG

GROUND PLANE AND ALL DIGITAL GROUND CONNECTIONS TO ONE COMMON DIGITAL GROUND PLANE ON THE PC BOARD. A SIMILAR

TECHNIQUE CAN BE USED FOR ALL ANALOG AND DIGITAL POWER SUPPLIES.

= AV

I = AV

Q = AV

R = +5V±5%

I = OV

Q = +3.3V±10%

10nF

47pF

4 x 10nF

10nF

47pF

10µF

10nF

10µF

10nF

47pF

10nF

47pF

MAX107

Figure 9. MAX107 Decoupling, Bypassing and Grounding

1 2 ... 12 13 14 15 16 17 18 19 20 21

Wideband Input Amplifier 1

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