AD9267EBZ datasheet(22/24 Pages) AD

Part #	AD9267EBZ

Description	10 MHz Bandwidth, 640 MSPS Dual Continuous Time Sigma-Delta Modulator

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Manufacturer	AD [Analog Devices]

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22 / 24 page

AD9267

Rev. 0 | Page 22 of 24

Referring to Figure 46, the 3 dB cutoff frequency of the low-

pass Chebyshev II filter response resides at 15.75 MHz, and at

10 MHz, there is 0.43 dB of attenuation due to the sharp roll-off

of the filter. Table 15 summarizes the components and

manufacturers used to build the circuit.

Table 15. Chebyshev II Filter Components

Parameter

Value

Unit

Manufacturer

Murata GRM188 series, 0603

180

Coil Craft 0402AF, 2%

390

Murata GRM188 series, 0603

220

Murata GRM188 series, 0603

–20

1012

14161820

–18

–16

–14

–12

–10

–8

–6

–4

–2

–60

–50

–40

–30

–20

–10

FREQUENCY (MHz)

Figure 46. Low-Pass Chebyshev II Filter Response

In addition to matching the profile of Figure 44, group delay

and channel matching are important filter design criteria. Low

tolerance components are highly recommended for improved

channel matching, which translates to minimal degradation in

image rejection for quadrature systems.

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