MICRF219 datasheet(15/23 Pages) MICREL

15 / 23 page

Micrel

MICRF219

June 2011

M9999-060811

(408) 944-0800

SC (MH

Carrier (M

n Part Number

REFO

Hz)

HIB Part Number

Abraco

9.81563

315.0

SA-9.815630-F-10-H-30-30-X

ABLS-9.81563MHz-10J4Y

12.15269

90.0

SA-12.152690-F-10-H-30-30-X

ABLS-12.15269MHz-10J4Y

13.02519

418.0

SA-13.025190-F-10-H-30-30-X

ABLS-13.025190MHz-10J4Y

13.52127

433.92

SA-13.521270-F-10-H-30-30-X

ABLS-13.521270MHz-10J4Y

4. Crystal requencies and Vendor Part Numbers

ata

n fo

ctly, it is

dth o

ilar to

7, PW2 is

ed for the

s found by

foun , the

ble 5. For

50%

(100

Therefore, a bandwidth of 13kHz would

be necessary (0.65 / 50µsec). However, if this data

ty cycle,

idt

Hz (0

20µsec). This

exce

the

m band

odulator circuit. If one tries to excee the

idth,

e pu

would appear

r w

SEL0

Pulse

Maxim

Baud

50%

ycle

Table

Demodulator Bandwidth Selection and D

Stream Optimization

JP1 and JP2 are the bandwidth selectio

demodulator bandwidth. To set it corre

necessary to know the shortest pulse wi

encoded data sent in the transmitter. Sim

example of the data profile in the Figure

shorter than PW1, so PW2 should be us

demodulator bandwidth calculation which i

0.65/shortest pulse width. After this value is

setting should be done according to Ta

example, if the pulse period is 100µsec,

cycle, the pulse width will be 50µsec (PW =

× 50%) / 100).

r the

f the

the

duty

µsec

stre

the

had

ndw

pulse p

h requi

would

eriod wit

d wo

a 20% du

d be 32.5k

maximu

then

.65 /

width

of th dem

max um

ndw

lse

stre hed o

ider.

JP1

JP2

(hertz)

(µsec)

for

SEL1

Demod.

Shortes

Rate

Duty

(Hz)

Short

1625

400

1250

Open

Short

3250

200

2500

Short

Open

6500

100

5000

Open

13000

10000

Table 5. JP1 and JP2 Setting, 433.92MHz

Other frequencies will have different demodulator

bandwidth limits, which is derived from the reference

oscillator frequency. Table 6 and Table 7 shows the

limits for the other two most used frequencies.

SEL1

Shortest

Pulse

(µsec)

Maximum

Baud Rate

for 50%

Duty Cycle

(Hz)

EL0

mod.

ertz)

Short

1565

416

1204

Open

Short

3130

208

2408

Short

Open

104

4816

6261

Open

12523

9633

Table 6. P1 an

Setting, 418.0MHz

SEL0

SEL1

Demod.

(hertz)

Shortest

Pulse

(µsec)

Maximum

Baud Rate

for 50%

Duty Cycle

(Hz)

d JP2

JP1

JP2

Short

1170

445

1123

Open

Short

2350

223

2246

Short

Open

4700

111

4493

Open

9400

8987

Table 7. JP1 and JP2 Setting, 315MHz

AGC Capacitor and Data Slicer Threshold

Capacitor Selection

Capacitors C6 and C4

TH and CAGC capacitors

respectively providing a time base reference for the

data pattern received. These capacitors are selected

according to data profile, pulse duty cycle, dead time

between two received data packets, and if the data

pattern does has or not have a preamble. See Figure

8 for example of a data profile.

are C

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