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December 1998b

MICRF011

MICRF011

Micrel

SEL0

SEL1

Demodulator Bandwidth (Hz)

SWP Mode

FIXED Mode

1

1

5000

10000

0

1

2500

5000

1

0

1250

2500

0

0

625

1250

Table 1

Nominal Demodulator (Baseband) Filter Bandwidth

vs. SEL0, SEL1 and Mode

No

.

Design Change

Retrofit Design Action

1.

Local Oscillator sweep range

reduced 2X. Affects SWP mode

only.

Reconsider Tx/Rx Frequency Alignment Error Budget, per App. Note 22.

If alignment tolerances cannot be met, consider:

(1) tighten ceramic resonator tolerance,

(2) replace ceramic resonator with crystal, or

(3) not to upgrade to -011

2.

Local Oscillator sweep rate reduced

2X. Affects SWP mode only.

Impacts SWP mode maximum data rate.

If data rate constraint cannot be met, consider

(1) reduce system data rate by 2X, or

(2) not to upgrade to -011

3.

IF Center Frequency reduced 2X.

Affects both modes SWP and

FIXED.

Factor this change into Tx/Rx Frequency Alignment Error Budget.

FIXED mode users of -001 must change crystal frequency.

4.

IF Bandwidth reduced 2X. Affects

both modes SWP and FIXED.

Factor this change into Tx/Rx Frequency Alignment Error Budget.

5.

FIXED mode Demod Filter cutoff

frequencies increased 2X. Affects

FIXED mode only.

For FIXED mode only, choose next lower filter frequency (via control pins

SEL0/1), to maintain same range performance

6.

CTH Pin Impedance

118k

Ω @ ft=4.90 MHz [see Note 4].

Affects both modes SWP and

FIXED.

Recompute appropriate value of CTH capacitor, and change value on PCB

Table 2

MICRF001/011 Change List and

Design Retrofit Guidelines