MICRF011BM TR【PDF 3/11 页】IC RCVR/DATAMOD300-440MHZ 14SOIC

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MICRF011

QwikRadio

tm

Micrel

SEL0

SEL1

SWP Mode

Demodulator Bandwidth (Hz)

FIXED Mode

1

0

1

0

1

1

0

0

5000

2500

1250

625

10000

5000

2500

1250

Table 1

Nominal Demodulator (Baseband) Filter Bandwidth

vs. SEL0, SEL1 and Mode

No

.

1.

2.

3.

4.

5.

6.

Design Change

Local Oscillator sweep range

reduced 2X. Affects SWP mode

only.

Local Oscillator sweep rate reduced

2X. Affects SWP mode only.

IF Center Frequency reduced 2X.

Affects both modes SWP and

FIXED.

IF Bandwidth reduced 2X. Affects

both modes SWP and FIXED.

FIXED mode Demod Filter cutoff

frequencies increased 2X. Affects

FIXED mode only.

CTH Pin Impedance

118k ? @ ft=4.90 MHz [see Note 4].

Retrofit Design Action

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

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

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

FIXED mode users of -001 must change crystal frequency.

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

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

SEL0/1), to maintain same range performance

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

Affects both modes SWP and

FIXED.

Table 2

MICRF001/011 Change List and

Design Retrofit Guidelines

December 1998b

3

MICRF011

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