ADC 2 Especificações descarregar pdf (Página 24)

f =

FILTER

ln(2) (n+1)´

2 2 Rp ´ C´ ´ ´

R=

ACQ

ln(2) 2(n+1) C´ ´ ´

BGND

CHB1+

CHB1-

CHB0+

CHB0-

CHA1+

CHA1-

CHA0+

CHA0-

REF

OUT

AGND

BGND

DB[11:0]

BUSY

CLOCK

CONVST

SDI

ADS7865

AGND

OPA2365

AGND

OPA2365

0.1 Fm

1 Fm

0.1 F(min)m

OPA2365

470nF

(min)

BGND

Controller

Device

ADS7865

SBAS441C –OCTOBER 2008–REVISED APRIL 2012

www.ti.com

APPLICATION INFORMATION

(3)

The absolute minimum configuration of the ADS7865

in an application is shown in Figure 36. In this case,

It is recommended to use a capacitor value of at least

the ADS7865 is used in dual-channel mode only, with

20pF.

the default settings of the device after power up.

Keep the acquisition time in mind; the resistor value

The input signal for the amplifiers must fulfill the

can be calculated as shown in Equation 4 for each of

common-mode voltage requirements of the ADS7865

the series resistors (with n = 12, the resolution of the

in this configuration. The actual values of the

ADS7865).

resistors and capacitors depend on the bandwidth

and performance requirements of the application.

(4)

Those values can be calculated using Equation 3,

with n = 12 being the resolution of the ADS7865.

Figure 36. Minimum ADS7865 Configuration

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 32 33

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