CC1020-RTR1 datasheet(57/91 Pages) TI

57 / 91 page

CC1020

SWRS046

Page 57 of 92

18.

On-Off Keying (OOK)

The data modulator can also provide OOK

(On-Off Keying) modulation. OOK is an

ASK (Amplitude Shift Keying) modulation

using 100% modulation depth. OOK

modulation is enabled in RX and in TX by

setting TXDEV_M[3:0] = 0000 in the

DEVIATION

OOK

eye

diagram is shown in Figure 32.

The data demodulator can also perform

OOK demodulation. The demodulation is

done by comparing the signal level with

the “carrier sense” level (programmed as

CS_LEVEL in the VGA4 register). The

signal is then decimated and filtered in the

data

filter.

Data

decision

and

bit

synchronization are as for FSK reception.

In this mode AGC_AVG in the VGA2

bandwidth must be 4 times the Baud rate

for data rates up to 9.6 kBaud. For the

highest data rates the channel bandwidth

must be 2 times the Baud rate (see Table

27). Manchester coding must always be

used for OOK.

Note that the automatic frequency control

(AFC) cannot be used when receiving

OOK, as it requires a frequency shift.

The AGC has a certain time-constant

determined

FILTER_CLK,

which

depends on the IF filter bandwidth. There

is a lower limit on FILTER_CLK and hence

the AGC time constant. For very low data

rates the minimum time constant is too

fast and the AGC will increase the gain

when a “0” is received and decrease the

gain when a “1” is received. For this

reason the minimum data rate in OOK is

2.4 kBaud.

Typical figures for the receiver sensitivity

(BER = 10

−3) are shown in Table 27 for

OOK.

Figure 32. OOK eye diagram. 9.6 kBaud

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