AFE032 datasheet(21/77 Pages) TI1

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C =

L =

AFE032

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SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013

The following steps can be used to quickly design the passive pass-band filter. (Note that these steps produce

an approximate result.)

1. Choose the filter characteristic impedance, ZC:

–

For a –6-db passband attenuation: R3 = R4 = ZC.

–

For a 0-db passband attenuation: R4 = ZC, R3 = 10 × ZC.

2. Calculate values for C3, C4, L3, and L4 using the following equations:

Table 2 and Table 3 show standard values for common applications.

Table 2. Recommended Component Values for Fourth-Order Passive Band-Pass Filters (0-dB Pass-Band

Attenuation)

FREQUENCY

RANGE

CHARACTERISTIC

FREQUENCY BAND

(kHz)

IMPEDANCE

Ω)

(nF)

(

μH)

(

μH)

CENELEC A

35 to 95

1 k

4.7

1.5

1500

4700

CENELEC B, C, D

95 to 150

1 k

1.7

1200

1500

SFSK

63 to 74

1 k

2.7

2.2

2200

FCC and ARIB

15 to 600

100

2.2

1000

Table 3. Recommended Component Values for Fourth-Order Passive Band-Pass Filters (–6-dB Pass-

Band Attenuation)

FREQUENCY

RANGE

CHARACTERISTIC

FREQUENCY BAND

(kHz)

IMPEDANCE

(nF)

(

μH)

(

μH)

CENELEC A

35 to 95

1 k

4.7

1.5

1500

4700

CENELEC B, C, D

95 to 150

1 k

1.7

1200

1500

SFSK

63 to 74

1 k

2.7

2.2

2200

FCC and ARIB

15 to 600

100

2.2

1000

Avoid excessive capacitive loading when laying out the printed circuit board (PCB) traces from the inputs or

outputs of the Rx block components. Keeping the PCB capacitance from the inputs to ground, or outputs to

ground, below 100 pF is recommended.

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